化学与化工:英文版最新文献

{"title":"Equilibrium and Kinetic Studies of Reactive Black 8 Adsorption onto Crosslinked Chitosan Beads","authors":"Sahra Dandil, Deniz Akin Sahbaz, C. Acıkgoz","doi":"10.17265/1934-7375/2019.01.001","DOIUrl":"https://doi.org/10.17265/1934-7375/2019.01.001","url":null,"abstract":"Environmental pollution problems by the discharge of effluent containing various contaminations from textile, paper and paint industries have become a serious issue in recent years. Dye removal from wastewater has received considerable attention for several adsorbents and several classes of dye. Reactive black 8 is an environmentally hazardous dye and most applicable in textile industries. Chitosan is a non-toxic, biodegradable and biocompatible and acts as an efficient adsorbent because of the amino functional groups. In the present work, the crosslinked chitosan beads were synthesized by using glutaraldehyde as a crosslinker and the adsorptive removal of reactive black 8 by the beads from an aqueous solution was investigated. The effect of contact time and initial dye concentration was evaluated. The adsorbent dosage was retained as 1 g/L and initial dye concentration values were varied from 30 to 150 mg/L. Equilibrium isotherms were analysed by Langmuir, Freundlich, Dubnin–Radushkevich, and Temkin isotherm. Freundlich isotherm model was found fit effectively for the reactive black 8 adsorptions. Kinetic adsorption data were evaluated using the pseudo-first-order kinetic model, the pseudo-second-order kinetic model and the intraparticle diffusion model. The adsorption followed pseudo second order kinetics. Overall, this study indicates chitosan beads as an efficient, eco-friendly and low-cost adsorbent for the removal of reactive black 8 dye from aqueous solutions.","PeriodicalId":67212,"journal":{"name":"化学与化工:英文版","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42929927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Computational Design of Azo-anthraquinone Schiff Base Mn Complexes as Mediators for Biofuel Cell Cathode","authors":"Kazuto Kajiwara, Shinsuke Yamane, T. Haraguchi, S. Pradhan, C. Sinha, R. Parida, S. Giri, Gourisankar Roymahaptra, Dohyun Moon, T. Akitsu","doi":"10.17265/1934-7375/2019.01.003","DOIUrl":"https://doi.org/10.17265/1934-7375/2019.01.003","url":null,"abstract":"The cathode of biofuel cell reduces molecular oxygen to water using four electrons, an enzyme of multicopper oxidase family, laccase, is contained, though its electron transfer efficiency from the electrode resulted in rate determining process. To improve this electron, transfer via mediators, we have investigated several mediator metal complexes between the electrode and laccase, in particular hydrophobic pocket on the surface. We have discussed DFT computational results and selected experimental data of new Mn(III/II) Schiff base complexes having redox active (anthraquinone) ligands and photochromic (azobenzene) ligands about azobenzene moiety at the sole molecular level. Moreover, we carried out computational docking simulation of laccase and complexes considering trans-cis photoisomerization (electronic states) and Weigert effect (molecular orientation to fit better) of azobenzene moiety. Additionally, actual experimental data also presented to indicate the expected merits for mediators.","PeriodicalId":67212,"journal":{"name":"化学与化工:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45425377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Chemical Model of Consciousness","authors":"A. Yerkin, Yemelyanova Valentina, Bulenbaev Maxat","doi":"10.17265/1934-7375/2019.01.005","DOIUrl":"https://doi.org/10.17265/1934-7375/2019.01.005","url":null,"abstract":"","PeriodicalId":67212,"journal":{"name":"化学与化工:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44089836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variable Optimization in Methylmethacrylate Polymerization by Using Design Expert as a Tool for Implementing ICTs in the Polymeric Systems Learning Process","authors":"A. O. Valdivia, C. M. Osorio, Y. V. Rodríguez, Lucila Giammatteo","doi":"10.17265/1934-7375/2019.01.002","DOIUrl":"https://doi.org/10.17265/1934-7375/2019.01.002","url":null,"abstract":"Polymers constitute a series of materials that are essential for many processes such as: food transport, packaging and distribution, construction, etc. Hence, it is important to understand the variables that this process depends on. Experimental design is a powerful tool that enables the identification of variables that significantly influence a process through a matrix of experiments that a software constructs. With the aim of implementing ICTs in the learning—teaching process of polymers in a university group, the polymerization process system of PPMA (polymethylmethacrylate) is studied. The variables that affect the size of the Pearl are: temperature, reaction time and volumen of the polyvinyl alcohol aqueous phase. These variables are optimized through a Box-Behnken experimental design with three factors in three levels, achieving the construction of the response surface to optimize the process, obtaining a tridimensional equation that enables the prediction of the Pearl size through the values of the independent variables. Finally, the student acquires the competency of manipulating the variables that affect the polymerization process to optimize the process. For this reason, Design Expert is a valuable ICT tool in the learning-teaching process of polymerization systems.","PeriodicalId":67212,"journal":{"name":"化学与化工:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43327630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of urea by ammonolysis of propylene carbonate","authors":"Alex, E. Elman, I. E. Davydov, E. A. Stepanov","doi":"10.17265/1934-7375/2018.01.004","DOIUrl":"https://doi.org/10.17265/1934-7375/2018.01.004","url":null,"abstract":"","PeriodicalId":67212,"journal":{"name":"化学与化工:英文版","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49245062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrosion Protection with Ion Barrier Coatings(I) Barrier to Anion Coating","authors":"Jianguo Wang, Su-Yu Wang","doi":"10.17265/1934-7375/2018.03.001","DOIUrl":"https://doi.org/10.17265/1934-7375/2018.03.001","url":null,"abstract":"A cation exchange membrane is permeable to cation and impermeable to anions. When the membrane is directly coated on a metal surface, the coating will not provide corrosion protection to the substrate, and it delaminated in salt fog testing. When the barrier to anion membrane coated on the surface of a primer, it inhibits anions to diffuse from the environment through the coating.","PeriodicalId":67212,"journal":{"name":"化学与化工:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41814413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential Application of Nanomaterials in Oil and Gas Field Drilling Tools and Fluids Design","authors":"Amanullah, J. Ramasamy","doi":"10.17265/1934-7375/2018.03.003","DOIUrl":"https://doi.org/10.17265/1934-7375/2018.03.003","url":null,"abstract":"The emerging nanoscience, nanotechnology and nanomaterials can be used for various industrial applications to enhance reliability, performance, stability and functional capability. Their application in the design and development of tools and materials used in oil and gas industry for extreme drilling conditions could overcome the current limitations of conventional tools and the various fluid systems used by the industry. The functional limitations such as poor physio-chemical stability in acid gas environment, frequent mechanical failure and malfunctioning in complex geological environment, thermal degradation in high temperature environment, etc. of currently used conventional tools and fluid systems are associated with extreme operating conditions due to a shift of the drilling operation from low risk to high risk geological environments, onshore to offshore locations, shallow water to deep water environment, etc. The progressive shift to increasingly higher risk operating environments is unavoidable as the energy demand of global community has increased manifold and is expected to increase further in future. Moreover, the probability and likelihood of finding easy oils and gas resources in low risk areas are diminishing quickly. That is why the oil and gas companies are constantly shifting to extremely challenging environments to meet the global energy demand. This is reflected by the expansion of drilling activities in complex geological areas, deep water environments, extreme-HPHT environments, etc. As the current tools and equipment and also the additives and chemicals often fail and/or lose their functional ability due to the detrimental effect of exposure of extremely harsh conditions, the industry needs tools and equipment, chemicals fluid additives that are highly reliable, chemically resistive, thermally and mechanically stable to ensure safe and trouble free drilling operations. It has been demonstrated in several fields of study that nanostructured materials and additives exhibit improved mechanical, chemical, thermal, electrical and tribological properties that can significantly increase the stability and durability of the tools and equipment along with the chemical and thermal stability of additives required for high performance fluid design. This review article captures the recent developments about the application of nanomaterials in the design and development of tools, equipment, additives, chemicals and smart materials to overcome current and future technical challenges of the oil and gas industry. Finally, the conventional of rule of mixtures of composite materials design and the current nanotechnology-based research conducted by various researchers have been highlighted to demonstrate potential of nanotechnology to enhance the physical, mechanical, chemical and thermal property of tools, equipment and various fluid systems used by the oil and gas industry.","PeriodicalId":67212,"journal":{"name":"化学与化工:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44460762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Chemical Treatment on Structural Properties of Jatropha curcas Seedcake","authors":"R. A. Ribeiro, S. Nobre","doi":"10.17265/1934-7375/2018.03.004","DOIUrl":"https://doi.org/10.17265/1934-7375/2018.03.004","url":null,"abstract":"Biodiesel is a biofuel obtained through a transesterification reaction using vegetable oils and animal fats. After oil extraction, the seedcake is a by-product, which can be used as a biofertilizer. This work evaluated the modifications in chemical structures that occurred in Jatropha cake after its submission to different treatments with distilled water and vapor of 10% v/v aqueous solution of acetic acid. Seedcakes were characterized by chemical analysis of acidity, water solubility, conductivity and infrared spectroscopy. The following values were observed in untreated cake (% w/w): moisture 6.1 ± 0.2, ash 5.2 ± 0.3, crude protein 26.5 ± 0.9, potassium 1.7 ± 0.1, crude fiber 34.9 ± 5.8, phosphorous 4.7 ± 0.4 and crude fat 13.8 ± 0.5. Ash, crude fiber and phosphorous content had no significant modifications, whereas crude protein decreased after acid treatment. Moisture and potassium content decreased after both water and acetic acid solution treatments. The acidity of the soluble fraction presented values around 5.8. Conductivities (S·cm) of the soluble fraction for cakes in natura, treated with water and treated with acetic acid were, respectively, 430.8 ± 13.6, 362.9 ± 8.1 and 599.3 ± 26.8 and solubilities (g 100 g H2O) were 0.309 ± 0.008, 0.241 ± 0.008 and 0.373 ± 0.012, respectively. These results showed that structures like hemicellulose and lignin were probably modified through acid hydrolysis, producing ionic groups and leading to higher conductivity and solubility. Similar infrared spectra were obtained for three cake samples. In general, Jatropha cake underwent slight modification concerning composition after acetic acid treatment.","PeriodicalId":67212,"journal":{"name":"化学与化工:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47068527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kinetic Model Heterogeneous Reaction Self-assembly on Nanocomposit Sorbent and Their Peculiarity","authors":"V. Olga","doi":"10.17265/1934-7375/2018.03.007","DOIUrl":"https://doi.org/10.17265/1934-7375/2018.03.007","url":null,"abstract":"","PeriodicalId":67212,"journal":{"name":"化学与化工:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43667846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Laws of the Chemical Psychology","authors":"A. Yerkin, Yemelyanova Valentina, S. Ruben, Askarova Gauhar","doi":"10.17265/1934-7375/2018.03.006","DOIUrl":"https://doi.org/10.17265/1934-7375/2018.03.006","url":null,"abstract":"","PeriodicalId":67212,"journal":{"name":"化学与化工:英文版","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41912731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}