Studies of the corrosion initiation at the pressure hydraulic test of pressure vessels during their filling, maintaining and draining are presented. It has been established that the most suitable method involves the use of corrosion inhibitors, which directly decrease the corrosion rate even in small or very small quantities. It was studied the influence of some corrosion inhibitors at different concentrations on some steel materials commonly used at pressure vessels manufacturing. The study involved the inhibitors testing both in laboratory and in factory conditions. Testing in laboratory conditions involved the analysis of the following inhibitors: urea, thiourea, triethanolamine, FINEAMIN 88 and FINEAMIN 06. The results were compared with those of the Adirol inhibitor, the currently used inhibitor. It was investigated the corrosion of the following stainless steels and unalloyed steels: A 240 grade 304, A 240 grade 316, A 516 grade 70, A 516 grade 60, P260-GH, P265, P275, P295-GH, P295, and P355. By recording the potentiodynamic polarization curves, the corrosion parameters (corrosion potential, corrosion current density, polarization resistance, corrosion rate, charge transfer coefficients for anodic and cathodic processes, inhibitors acting coefficients, and inhibition efficiencies) have been evaluated. The following corrosion inhibitor solutions were selected for testing under the factory specific conditions: Instal Protect SP at concentrations of 5%, 7.5% and 10%, ELG INCOR SP at 10% concentration, FINEAMIN 06 at 10/00 concentration and a mixture of 40mL FINEAMIN 06 + 40 mL FINEAMIN 88 SCAV25 in 40 L water. The analysed steels were A 106 grade B and A 283 grade C. Tests in laboratory conditions revealed a different behaviour of the inhibitors, depending on the analysed concentration and steel grade. The inhibitors proven as appropriate following the tests in the factory conditions were ELG INCOR SP used in industrial water (tap water), whereas

Stability of nanofluids is one of the most important factors to ensure the most benefit of the properties of nanoparticles. Zinc oxide was used in the research with concentration between (0.2-1) wt. % with ethylene glycol base fluid. The stability of ZnO nanofluid was enhanced by adding two types of surfactants Tx-100 and Gum Arabic with concentration of (0.1-0.5) vol. % to stabilize the ZnO nanoparticles in the base fluid. The results showed that the Gum Arabic surfactant led to more stable fluid than that of Tx-100; this was shown from zeta potential and UV spectroscopy measurements. The thermal conductivity coefficient was also measured, and the results showed that the thermal conductivity increased with adding surfactant than without using a stabilizer

In this study, an adsorption process using hemp-based materials in felt form was applied to remove between 45 and 53 contaminants present in wastewater from the surface treatment industry. Several materials were compared using batch experiments, including a felt made of 100% hemp fiber (HEMP), the same felt cross-linked with 1,2,3,4-butanetetracarboxylic acid (HEMPBA), a felt coated with a maltodextrin-1,2,3,4-butanetetracarboxylic cross-linked polymer (HEMPM), and a felt coated with hydroxypropyl-ß-cyclodextrin-1,2,3,4-butanetetracarboxylic cross-linked polymer (HEMPCD). Chemical analysis showed that HEMPBA, HEMPM and HEMPCD materials had high adsorption capacities on metals in wastewater, confirming the role of carboxylic groups. Only HEMPCD was able to remove both metals and organics, resulting in the virtual elimination of organics such as chloroform, 1,2-dichlorobenzene, and nonylphenol. This result demonstrated the important role of cyclodextrin molecules in adsorption mechanism. HEMPCD also resulted in an important decrease in residual chemical oxygen demand and total organic carbon of more than 83% and 53%, respectively, while the treatment with HEMP lowered them by 12% and 12%, HEMPBA by 9% and 7%, and HEMPM by 45% and 26%. Chemical abatement and toxicity mitigation have demonstrated that adsorption onto a nonconventional material could be an interesting treatment step for the detoxification of wastewater.

The massive scale of industrial development has resulted in environmental pollution in general and water contamination in particular. It is important at the present time to treat water for the purpose of eliminating or reducing pollutants, especially toxic pollutants, such as phenol compounds. In this study, zeolite (4A) was prepared firstly from the available and cheap materials using an inclined rotary disk. Then, physical, mechanical, and chemical properties were also studied. Experiments were conducted to determine these properties using local clay and the following results were obtained: Zeolite (4A) 70% and clay 30%, the time of calcination 3 h at a temperature of 850°C, breakage resistance of 17 Ib pounds, surface area 530-590 m2 /g, grinding value 14% and moisture absorption ratio 30%. The prepared zeolite (4A) was used in the process of removing phenolic compounds (chlorophenol, nitrophenol) by the adsorption method. Different amounts of prepared zeolite (5g/l and 10g/L) will be used in the treatment process and different concentrations (2mg/L, 5 mg/L and 10 mg/L) of the pollutants Nitrophenol and Chlorophenol were used in the contaminated water tested. The removal process was carried out with a mixing speed of 200 rpm and pH (7.5-8.5). From the results of this study, we note that the highest percentage of Nitrophenol removal is (84.8%) when using an amount of zeolite (5g) and highest percentage of Nitrophenol removal is (95.5%) when using an amount of zeolite (10g) while that the highest percentage of Chlorophenol removal is (78.3%) when using an amount of zeolite (5g) and highest percentage of Chlorophenol removal is (0.894) when using an amount of zeolite (10g) it could be deduced that the percentage of the removal of nitrophenol was higher than that of chlorophenol because its solubility of chlorophenol in water is higher than the solubility of Nitrophenol.

The massive scale of industrial development has resulted in environmental pollution in general and water contamination in particular. It is important at the present time to treat water for the purpose of eliminating or reducing pollutants, especially toxic pollutants, such as phenol compounds. In this study, zeolite (4A) was prepared firstly from the available and cheap materials using an inclined rotary disk. Then, physical, mechanical, and chemical properties were also studied. Experiments were conducted to determine these properties using local clay and the following results were obtained: Zeolite (4A) 70% and clay 30%, the time of calcination 3 h at a temperature of 850°C, breakage resistance of 17 Ib pounds, surface area 530-590 m2 /g, grinding value 14% and moisture absorption ratio 30%. The prepared zeolite (4A) was used in the process of removing phenolic compounds (chlorophenol, nitrophenol) by the adsorption method. Different amounts of prepared zeolite (5g/l and 10g/L) will be used in the treatment process and different concentrations (2mg/L, 5 mg/L and 10 mg/L) of the pollutants Nitrophenol and Chlorophenol were used in the contaminated water tested. The removal process was carried out with a mixing speed of 200 rpm and pH (7.5-8.5). From the results of this study, we note that the highest percentage of Nitrophenol removal is (84.8%) when using an amount of zeolite (5g) and highest percentage of Nitrophenol removal is (95.5%) when using an amount of zeolite (10g) while that the highest percentage of Chlorophenol removal is (78.3%) when using an amount of zeolite (5g) and highest percentage of Chlorophenol removal is (0.894) when using an amount of zeolite (10g) it could be deduced that the percentage of the removal of nitrophenol was higher than that of chlorophenol because its solubility of chlorophenol in water is higher than the solubility of Nitrophenol.

Performance, emission and combustion studies were carried out on the ceramic coated diesel engine (YSZ) fed with biodiesel obtained from the oil derived from the mango seeds (MSBD) and MSBD blended with turpentine oil (MSBTO). The performance study showed that the MSBD and MSBTO blends showed 3.6% and 7.1% more BSFC value compared to that of DF in ceramic coated engine due to higher density and viscosity. The maximum brake thermal efficiency was observed 28% for DF in coated engine compared to other fuels due to less fuel consumption of DF because of lower density. The emission characteristics displayed that the MSBTO fuel showed 12%, 15.2% and 29.1% reduction in the smoke density, NOx and CO respectively compared to that of DF in coated engine. However, the MSBD and MSBTO showed 17 and 21% more release of UBHC at full conditions compared to that of DF in ceramic coated engine due to lesser calorific values of MSBD and MSBTO compared to the calorific value of DF. Combustion study revealed that the MSBD and MSBTO displayed less cylinder pressure compared to that of DF in coated engine and the MSBTO fuel showed the 5.3% decrease in the cylinder pressure compared to that of DF in coated engine owing to less heat liberation and lower cetane value. HRR followed the similar trend of variation of cylinder pressure and the MSBTO displayed 7.4% lower HRR compared to that of DF in coated engine.

Due to high efficiency and environmental friendship, Fenton-like technology is widely used in water treatment and has always received significant attentions, especially in design of novel and efficient Fenton-like catalysts. In this paper, iron/titanium ions doped halloysite nanotubes (HNTs-Fe-Ti) have been developed as Fenton-like catalyst. Here, halloysite nanotubes (HNTs) with high specific surface area and excellent ion exchange capacity were used as carriers, and iron/titanium ions were tracedoped into HNTs via simple ion-exchange reaction. The degradation of the designed catalyst for methylene blue (MB) was greatly accelerated in the presence of titanium ion. It demonstrates that the excellent degradation ability mainly owes to the valence state transformation of titanium and the good adsorption ability of halloysite nanotubes. It shows the mechanism of titanium with multivalent states (Ti3+/Ti4+) on the degradation of MB is similar to the Fenton catalytic mechanism of iron ion transformation (Fe2+/Fe3+). In the Fenton-like degradation reaction, titanium and iron play a synergistic catalytic role in MB degradation while titanium has greater impact. When the ratio of titanium to iron is 5:1, the catalyst exhibits superior Fenton-like degradation performance, and the degradation rate could reach 91% at 100 min.

Here we present a new drug delivery system based on xanthan esterified with acrylic acid. This material served as a matrix for the incorporation of bioactive substances with antimicrobial and anti-inflammatory properties. The materials were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR) and Scanning Electron Micrography (SEM). Mechanical strength tests showed a substantial improvement in the resilience and flexibility of the polymer matrix modified by esterification under conditions of mechanical stress. The release of bioactive substances from the basic matrix follows a Korsmeyer-Peppas type kinetics. The modified xanthan-based transport system was shown to be antimicrobial active with an inhibition rate of almost 100% on grampositive and gram-negative bacteria. The obtained results recommend this biomaterial for the manufacture of transdermal drug delivery devices.

Zinc oxide nanoparticles have wide applications as catalysts, antimicrobial agents, drug delivery agents, etc. because of their intrinsic properties. Various methods can be applied to synthesise nanoparticles, one of which is the biosynthesis process. Biosynthesis is more eco-friendly than chemical and physical methods. In the present study, the optimisation of zinc oxide nanoparticle biosynthesis using the yeast Saccharomyces cerevisiae was performed by applying a response surface method called the Box–Behnken design (BBD). Three factors were optimised in the present study, namely the concentration of zinc acetate as the precursor (X1), concentration of the S. cerevisiae fermentation broth (X2), and the incubation time (X3). The mass of zinc oxide nanoparticles (Y) was recorded as the response of the experiment. The product was then characterised by fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD), scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), and particle size analyser (PSA). The optimum conditions for the preparation of zinc oxide nanoparticles were found to be 0.3 M, 100% (v/v), and 24 h as the zinc acetate concentration, medium concentration, and incubation time, respectively. The FTIR analysis showed peaks at ~600 cm-1 , which is characteristic for ZnO stretching. From the XRD result, the ZnO nanoparticles with hexagonal structure was confirm. The SEM/EDS analysis confirmed that the morphology was spherical and showed the major energy emission for zinc and oxygen. Moreover, the PSA analysis revealed that the smallest size was 218.6 nm (12%) when the synthesis was performed at the optimum conditions, while when the incubation time was prolonged for 120 h, the size decreased to 134.2 nm.

Although Pakistan is stacked with enormous varieties of medicinal plants, only a little proportion of these plants has been evaluated for their medicinal and therapeutic properties. Herein, four indigenous medicinal plants Citrus sinenesis, Citrus paradiasii, Moringa olifera, and Hibiscus rosa-sinenesis were collected and subjected to phytochemical analyses to scrutinize the presence of secondary metabolites. Qualitative analysis showed the presence of an array of secondary metabolites in the selected plants, which were further corroborated by high-performance liquid chromatography. Results revealed the presence of 33.24, 21.04, 15.2 ppm gallic acid in methanol, ethyl acetate and nhexane fraction of C. sinensis peels extract, respectively. C. paradaissi peels consist of 24.06, and 18.24 ppm of gallic acid and caffeic acid, respectively, in methanol and chloroform fractions, whereas its methanolic seeds extract contain caffeic acid as a major component (10.63 ppm). H. rosa-sinenesis has shown p-coumaric acid, caffeic acid, and gallic acid at 35.26, 15.04, and 11.4 ppm, respectively. M. olifera contained 3.24 ppm gallic acid in pods extract while stems and leaves extract contain a very low amount. Anticancer profile evinced that Citrus sinensis extract showed the highest percent inhibition (142.746%) of human liver cancer (Hep G2) cell lines followed by H. rosa-sinensis (132.49%), C. paradaisii (82.39%) and M. olifera (68.0%). The determined IC50 values for antioxidant activity were C. sinenesis (IC50=0.49 mM), C. paradaisii (IC50=0.43 mM), M. olifera (IC50=0.42 mM) and H. rosasinensis (IC50=0.41 mM). Conclusively, the selected plants could be an effective alternative and deliverable chemical therapeutic to the pharmaceutical industry due to their excellent biological effects.

Esterification Thermodynamic and Kinetic on acetic acid with camphene was studied systematically in an intensified fixed bed reactor at 303-323 K with anhydrous NKC-9 resin. The catalyst loading, initial molar ratio, temperature, and catalyst reusability were studied and optimized. The method of UNIFAC was applied to calculate the activity coefficient of each component for correcting the nonideality of the solution. Reaction enthalpy, entropy, and Gibbs free energy were calculated. The kinetics of camphene esterification was studied by pseudo-homogeneous model (PH model), and the fitting effect was good, which provided experimental reference and theoretical basis for the industrial production of isobornyl acetate.

The quality of water around a municipal dumpsite is greatly affected by the leaching chemicals from the landfill. The aim of this study is to assess the groundwater quality and to develop and compare the performance of Statistical Package of Social Science (SPSS) regression and Artificial Neural Network models around municipal dumpsite in Tamil Nadu, India. The groundwater samples were collected every month from the 16 sampling points during the study period from January 2013 to December 2017. The physico chemical parameters of the samples such as pH, acidity, alkalinity, Hardness, Chloride, Sulphate and Total Dissolved Solids (TDS) were analysed and Water Quality Index (WQI) was arrived. From this data, the highest and the lowest polluted points S14 and S5 respectively, among the 16 sampling points was found. Correlation analysis showed that TDS exhibited a high positive correlation with chloride and hardness. Two models using SPSS regression and one model using ANN modeling were developed to predict the TDS in the sampling points. The prediction capabilities of the ANN were compared with the SPSS regression models. The maximum percentage of error obtained from ANN and SPSS were 7.5% and 15.6% at S5 sampling point. ANN models were more accurate than the SPSS multi nonlinear regression models having the same inputs and output.

Chemical Safety Management Training Hub for Chemicals Users/ChemSM-HUB – project funded under Erasmus+ Programme - has been tailored to meet the training needs related to legal provisions under REACH & CLP Regulations of employees responsible for CSM among downstream users (DU) and distributers (D) of chemicals. The strategic objectives proposed by the project were to increase awareness of relevant professional communities on the new European legislation on CSM, strengthen the competencies of the target groups in the field of CSM, and enhance the ability of trainers to create and deliver vocational training. The design and concept of the training hub and the training materials have been established based on a training needs assessment, which also provided the necessary information to define the training objectives, the format, and the type of materials to be developed. To ensure high quality of the training, but also the availability in a user-friendly format, the training materials and the training hub have been developed and improved progressively as part of a consortium peer-review process during the joint-staff training organized in Romania according to the format of Erasmus+ Programme - KA202 Strategic Partnerships for vocational education and training. Also, the materials created have been subjected to pilot testing during the blended mobility training of VET learners within Erasmus+ Programme - which, according to the new circumstances imposed by Sars-Cov-2 pandemic has been organized strictly online using an integrated approach of a webinar application and the ChemSM-HUB e-learning platform. According to the feedback received in both cases – during peer review and the pilot training - materials and the hub have been subject to various changes and resulted in a comprehensive training package and, respectively, a training hub that facilitates individual study and certification of the DU & D of chemicals, and provides access to up-todate information in a concise and structured format.

Chemical Safety Management Training Hub for Chemicals Users/ChemSM-HUB – project funded under Erasmus+ Programme - has been tailored to meet the training needs related to legal provisions under REACH & CLP Regulations of employees responsible for CSM among downstream users (DU) and distributers (D) of chemicals. The strategic objectives proposed by the project were to increase awareness of relevant professional communities on the new European legislation on CSM, strengthen the competencies of the target groups in the field of CSM, and enhance the ability of trainers to create and deliver vocational training. The design and concept of the training hub and the training materials have been established based on a training needs assessment, which also provided the necessary information to define the training objectives, the format, and the type of materials to be developed. To ensure high quality of the training, but also the availability in a user-friendly format, the training materials and the training hub have been developed and improved progressively as part of a consortium peer-review process during the joint-staff training organized in Romania according to the format of Erasmus+ Programme - KA202 Strategic Partnerships for vocational education and training. Also, the materials created have been subjected to pilot testing during the blended mobility training of VET learners within Erasmus+ Programme - which, according to the new circumstances imposed by Sars-Cov-2 pandemic has been organized strictly online using an integrated approach of a webinar application and the ChemSM-HUB e-learning platform. According to the feedback received in both cases – during peer review and the pilot training - materials and the hub have been subject to various changes and resulted in a comprehensive training package and, respectively, a training hub that facilitates individual study and certification of the DU & D of chemicals, and provides access to up-todate information in a concise and structured format.

Chemical Safety Management Training Hub for Chemicals Users/ChemSM-HUB – project funded under Erasmus+ Programme - has been tailored to meet the training needs related to legal provisions under REACH & CLP Regulations of employees responsible for CSM among downstream users (DU) and distributers (D) of chemicals. The strategic objectives proposed by the project were to increase awareness of relevant professional communities on the new European legislation on CSM, strengthen the competencies of the target groups in the field of CSM, and enhance the ability of trainers to create and deliver vocational training. The design and concept of the training hub and the training materials have been established based on a training needs assessment, which also provided the necessary information to define the training objectives, the format, and the type of materials to be developed. To ensure high quality of the training, but also the availability in a user-friendly format, the training materials and the training hub have been developed and improved progressively as part of a consortium peer-review process during the joint-staff training organized in Romania according to the format of Erasmus+ Programme - KA202 Strategic Partnerships for vocational education and training. Also, the materials created have been subjected to pilot testing during the blended mobility training of VET learners within Erasmus+ Programme - which, according to the new circumstances imposed by Sars-Cov-2 pandemic has been organized strictly online using an integrated approach of a webinar application and the ChemSM-HUB e-learning platform. According to the feedback received in both cases – during peer review and the pilot training - materials and the hub have been subject to various changes and resulted in a comprehensive training package and, respectively, a training hub that facilitates individual study and certification of the DU & D of chemicals, and provides access to up-todate information in a concise and structured format.

The current study reports the green synthesis of silver nanoparticles (AgNPs) using Capparis spinosa leaf extract acting as a capping and reducing agent. The characterization of AgNPs was confirmed using ultraviolet-visible spectrophotometry (UV-Visible), fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). The plant extract used reduces Ag+ into AgNPs within a few minutes as indicated by the changed color, from yellow to reddish-brown. The UV-vis spectrum of AgNPs appeared a characteristic surface plasmon resonance peak at 400-450 nm. FTIR spectroscopy confirmed the role of plant extract as a reducing and capping agent of silver ions. The spectra of FTIR revealed a broad transmission peaks from 3412 to 617 cm-1 . An EDX analysis signal at 3 keV and weight 65.38% showed the peak to be in the silver region, a fact which was confirmed by the presence of elemental silver. Under TEM, the nanoparticles were seen to be spherical, with an average particle size of 13 nm. AgNPs showed antibacterial activity against S. epidermidis, S. aureus, MRSA and E. coli. The inhibition zones for S. epidermidis and S. aureus were 8 to 10 mm, while MRSA is 7 to 10 mm. The inhibition zone of E. coli was higher at 10 to 13 mm.