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Insight into Equilibrium and Kinetics of the Binding of Cadmium Ions on Radiation-Modified Straw from Oryza sativa 辐射改性水稻秸秆镉离子结合平衡及动力学研究
Journal of Chemical Technology & Biotechnology Pub Date : 2013-07-30 DOI: 10.1155/2013/417180
S. Z. Ali, M. Athar, U. Farooq, M. Salman
{"title":"Insight into Equilibrium and Kinetics of the Binding of Cadmium Ions on Radiation-Modified Straw from Oryza sativa","authors":"S. Z. Ali, M. Athar, U. Farooq, M. Salman","doi":"10.1155/2013/417180","DOIUrl":"https://doi.org/10.1155/2013/417180","url":null,"abstract":"The present study reports the chemical modification of agricultural waste (rice straw) with urea using microwave radiation and the efficiency evaluation of this modified rice straw for the adsorption of a toxic heavy metal, cadmium. The elemental analysis of urea modified rice straw affirmed urea grafting on rice straw, and FTIR spectra of chemically benign modified adsorbent showed the presence of hydroxyl, carbonyl, and amino functional groups. Effects of process parameters (adsorbent dosage, contact time, agitation speed, pH, and temperature) were studied in batch mode. Parameters were optimized for the equilibrium study, and adsorption mechanism was elucidated using five mathematical models (Langmuir, Freundlich, Temkin, Harkin-Jura, and Dubinin-Radushkevich). Binding of Cd(II) ions on modified adsorbent followed Langmuir model, and the maximum uptake capacity was found to be 20.70 mg g−1. Kinetic modeling was done using six different kinetic models. The process was considered physisorption according to the obtained activation energy value. Thermodynamic parameters confirmed the process to be favorable and feasible. Exothermic nature of adsorption of Cd(II) ions on urea modified rice straw was confirmed by the negative value of ΔH°.","PeriodicalId":15303,"journal":{"name":"Journal of Chemical Technology & Biotechnology","volume":"45 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2013-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91003648","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}
引用次数: 9
Performance of the Biocompatible Surfactant Tween 80, for the Formation of Microemulsions Suitable for New Pharmaceutical Processing 生物相容性表面活性剂Tween 80的性能，用于形成适合新药加工的微乳
Journal of Chemical Technology & Biotechnology Pub Date : 2013-07-14 DOI: 10.1155/2013/930356
C. Prieto, L. Calvo
{"title":"Performance of the Biocompatible Surfactant Tween 80, for the Formation of Microemulsions Suitable for New Pharmaceutical Processing","authors":"C. Prieto, L. Calvo","doi":"10.1155/2013/930356","DOIUrl":"https://doi.org/10.1155/2013/930356","url":null,"abstract":"The aim of this work was to investigate the phase behaviour and the structure of the n-hexane/water emulsions based on a nonionic, nontoxic and biocompatible surfactant, Tween 80. This system is of interest for new pharmaceutical techniques based on supercritical fluids to form nano- and encapsulated particles. However, it showed a lack of stability denoted by large areas of macroemulsion. For this reason, the effect of additives (alcohols and brine) and external variables (temperature) were explored. The replacement of water by brine caused negligible impact due to the nonionic character of Tween 80. On the contrary, the presence of an alcohol (ethanol or 1-butanol) enhanced the solubility of the surfactant in the oil phase and decreased the mixture viscosity, resulting in improved surface activity. Similar results were obtained by raising the temperature until the cloud point was reached (60°C). With these modifications, microemulsions at relatively low concentrations of surfactant (around 30%) and within a broad interval of compositions could be obtained, widening their possible use in pharmaceuticals manufacturing (such as controlled drug delivery, enzymatic reactions, or excipient processing). The understanding of the surfactant performance could be further used to substitute the n-hexane by a greener solvent, such as supercritical CO2.","PeriodicalId":15303,"journal":{"name":"Journal of Chemical Technology & Biotechnology","volume":"26 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2013-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84013497","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}
引用次数: 78
Recent Development in Chemical Depolymerization of Lignin: A Review 木质素化学解聚研究进展
Journal of Chemical Technology & Biotechnology Pub Date : 2013-07-10 DOI: 10.1155/2013/838645
Hai Wang, M. Tucker, Yun Ji
{"title":"Recent Development in Chemical Depolymerization of Lignin: A Review","authors":"Hai Wang, M. Tucker, Yun Ji","doi":"10.1155/2013/838645","DOIUrl":"https://doi.org/10.1155/2013/838645","url":null,"abstract":"This article reviewed recent development of chemical depolymerization of lignins. There were five types of treatment discussed, including base-catalyzed, acid-catalyzed, metallic catalyzed, ionic liquids-assisted, and supercritical fluids-assisted lignin depolymerizations. The methods employed in this research were described, and the important results were marked. Generally, base-catalyzed and acid-catalyzed methods were straightforward, but the selectivity was low. The severe reaction conditions (high pressure, high temperature, and extreme pH) resulted in requirement of specially designed reactors, which led to high costs of facility and handling. Ionic liquids, and supercritical fluids-assisted lignin depolymerizations had high selectivity, but the high costs of ionic liquids recycling and supercritical fluid facility limited their applications on commercial scale biomass treatment. Metallic catalyzed depolymerization had great advantages because of its high selectivity to certain monomeric compounds and much milder reaction condition than base-catalyzed or acid-catalyzed depolymerizations. It would be a great contribution to lignin conversion if appropriate catalysts were synthesized.","PeriodicalId":15303,"journal":{"name":"Journal of Chemical Technology & Biotechnology","volume":"47 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2013-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76127609","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}
引用次数: 212
Arsenic Precipitation in the Bioleaching of Realgar Using Acidithiobacillus ferrooxidans 酸性氧化亚铁硫杆菌浸出雄黄过程中砷的沉淀
Journal of Chemical Technology & Biotechnology Pub Date : 2013-06-27 DOI: 10.1155/2013/424253
Peng Chen, Lei Yan, Qiang-Lin Wang, Hongyu Li
{"title":"Arsenic Precipitation in the Bioleaching of Realgar Using Acidithiobacillus ferrooxidans","authors":"Peng Chen, Lei Yan, Qiang-Lin Wang, Hongyu Li","doi":"10.1155/2013/424253","DOIUrl":"https://doi.org/10.1155/2013/424253","url":null,"abstract":"The current study investigates the characteristics of arsenic precipitation during the bioleaching of realgar. The bioleaching performance of Acidithiobacillus ferrooxidans BY-3 (A. ferrooxidans) was investigated through scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectrophotometry. SEM and XRD analyses revealed that the arsenic-adapted strain of A. ferrooxidans was more hydrophobic and showed higher attachment efficiency to realgar compared with the wild strain. The arsenic precipitation using A. ferrooxidans resulted in the precipitation of an arsenic-rich compound on the surface of the bacterial cell, as shown in the TEM images. The FT-IR spectra suggested that the −OH and −NH groups were closely involved in the biosorption process. The observations above strongly suggest that the cell surface of A. ferrooxidans plays a role in the induction of arsenic tolerance during the bioleaching of realgar.","PeriodicalId":15303,"journal":{"name":"Journal of Chemical Technology & Biotechnology","volume":"55 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2013-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73811929","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}
引用次数: 12
Thermal Decomposition Behavior of Melaminium Benzoate Dihydrate 二水合苯甲酸三聚氰胺的热分解行为
Journal of Chemical Technology & Biotechnology Pub Date : 2013-06-20 DOI: 10.1155/2013/194576
N. Kanagathara, M. Marchewka, K. Pawlus, S. Gunasekaran, G. Anbalagan
{"title":"Thermal Decomposition Behavior of Melaminium Benzoate Dihydrate","authors":"N. Kanagathara, M. Marchewka, K. Pawlus, S. Gunasekaran, G. Anbalagan","doi":"10.1155/2013/194576","DOIUrl":"https://doi.org/10.1155/2013/194576","url":null,"abstract":"Crystals of melaminium benzoate dihydrate (MBDH) have been grown from aqueous solution by slow solvent evaporation method at room temperature. Powder X-ray diffraction analysis confirms that MBDH crystallizes in the monoclinic system (C2/c). Thermal decomposition behavior of MBDH has been studied by thermogravimetric analysis at three different heating rates: 10, 15, and 20°C/min. Nonisothermal studies of MBDH revealed that the decomposition occurs in three stages. The values of effective activation energy (Ea) and preexponential factor (ln A) of each stage of thermal decomposition for all heating rates were calculated by model free methods: Arrhenius, Flynn-Wall, Friedman, Kissinger, and Kim-Park methods. A significant variation of effective activation energy (Ea) with conversion (α) indicates that the process is kinetically complex. The linear relationship between the A and Ea values was established (compensation effect). Avrami-Erofeev model (A3), contracting cylinder (R2), and Avrami-Erofeev model (A4) were accepted by stages I, II, and III, respectively. DSC has also been performed.","PeriodicalId":15303,"journal":{"name":"Journal of Chemical Technology & Biotechnology","volume":"30 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2013-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81368382","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}
引用次数: 5
Novel Oxidative Desulfurization of a Model Fuel with H2O2 Catalyzed by AlPMo12O40 under Phase Transfer Catalyst-Free Conditions 无相转移催化剂条件下AlPMo12O40催化H2O2模型燃料新型氧化脱硫研究
Journal of Chemical Technology & Biotechnology Pub Date : 2013-06-12 DOI: 10.1155/2013/147945
M. J. Silva, L. Santos
{"title":"Novel Oxidative Desulfurization of a Model Fuel with H2O2 Catalyzed by AlPMo12O40 under Phase Transfer Catalyst-Free Conditions","authors":"M. J. Silva, L. Santos","doi":"10.1155/2013/147945","DOIUrl":"https://doi.org/10.1155/2013/147945","url":null,"abstract":"A novel process was developed for oxidative desulfurization (ODS) in the absence of a phase transfer catalyst (PTC) using only Keggin heteropolyacids and their aluminum salts as catalysts. Reactions were performed in biphasic mixtures of isooctane/acetonitrile, with dibenzothiophene (DBT) as a model sulfur compound and hydrogen peroxide as the oxidant. Remarkably, only the AlPMo12O40-catalyzed reactions resulted in complete oxidation of DBT into DBT sulfone, which was totally extracted by acetonitrile, reducing the sulfur content of isooctane from the 1000 ppm to  H3PMo12O40 > AlPW12O40 > H3PW12O40. The absence of a PTC, acidic organic peroxides, and the use of hydrogen peroxide, an environmentally benign oxidant, make up the positive aspects of AlPMo12O40-catalyzed ODS reactions. In these reactions, high rates of DBT removal (ca. 100%) were achieved within a short time (ca. 2 hours) and under mild reaction conditions.","PeriodicalId":15303,"journal":{"name":"Journal of Chemical Technology & Biotechnology","volume":"251 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2013-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72873293","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}
引用次数: 16
Proximate Analysis, Mineral Contents and Functional Properties of Moringa Oleifera Leaf Protein Concentrate. 辣木叶浓缩蛋白的近似分析、矿物质含量及功能特性。
Journal of Chemical Technology & Biotechnology Pub Date : 2013-01-01 DOI: 10.6084/M9.FIGSHARE.1097420
A. Sodamade, O. Bolaji, O. Adeboye
{"title":"Proximate Analysis, Mineral Contents and Functional Properties of Moringa Oleifera Leaf Protein Concentrate.","authors":"A. Sodamade, O. Bolaji, O. Adeboye","doi":"10.6084/M9.FIGSHARE.1097420","DOIUrl":"https://doi.org/10.6084/M9.FIGSHARE.1097420","url":null,"abstract":"Freshly harvested Moringa oleifera was authenticated and processed for its vegetable leaf protein concentrates and analysed for proximate composition, functional properties and mineral composition. The proximate analysis was evaluated using standard analytical procedures. The proximate analysis reveal the moisture content to be 9.00mg/100g, ash content 6.00mg/100g, crude fat 2.43mg/100g, crude fibre 5.43mg/100g, crude protein 39.13mg/100g and carbohydrate content is 38.21 mg/100g. The mineral content of the leaves indicated that Ca, Mg, Zn, Mn, and Na are the most abundant. The water absorption capacity, fat absorption capacity, emulsion capacity, foaming stability revealed good functional properties.","PeriodicalId":15303,"journal":{"name":"Journal of Chemical Technology & Biotechnology","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84149530","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}
引用次数: 74
Structural Transitions in Sheared Electrically Stabilized Colloidal Crystals 剪切电稳定胶体晶体的结构转变
Journal of Chemical Technology & Biotechnology Pub Date : 2012-08-06 DOI: 10.1155/2013/909841
J. Kaldasch, B. Senge, J. Laven
{"title":"Structural Transitions in Sheared Electrically Stabilized Colloidal Crystals","authors":"J. Kaldasch, B. Senge, J. Laven","doi":"10.1155/2013/909841","DOIUrl":"https://doi.org/10.1155/2013/909841","url":null,"abstract":"A Landau theory is presented for the structural transition of electrically stabilized colloidal crystals under shear. The model suggests that a structural transition from an ordered layered colloidal crystal into a disordered structure occurs at a critical shear stress. The shear induced structural transition is related to a change of the rheological properties caused by the variation of the microstructure which can be verified by scattering experiments. The theory is used to establish the shape of the flow curves. A good qualitative agreement with experimental results can be achieved, while a scaling relation similar to the elastic scaling is established.","PeriodicalId":15303,"journal":{"name":"Journal of Chemical Technology & Biotechnology","volume":"21 1","pages":"909841"},"PeriodicalIF":0.0,"publicationDate":"2012-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81809250","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}
引用次数: 1
Delignification of Pinus taeda wood chips treated with Ceriporiopsis subvermispora for preparing high-yield kraft pulps Part of this work was presented at the 2000 Tappi Pulping/Process & Product Quality Conference, Boston, USA, 2000 and divulgated through Tappi PULP/PPQ-CD-00 在2000年美国波士顿举行的2000年Tappi制浆/工艺与产品质量会议上介绍了本研究的部分内容，并通过Tappi PULP/PPQ-CD-00进行了披露
Journal of Chemical Technology & Biotechnology Pub Date : 2002-04-01 DOI: 10.1002/JCTB.569.ABS
R. Mendonça, A. Guerra, A. Ferraz
{"title":"Delignification of Pinus taeda wood chips treated with Ceriporiopsis subvermispora for preparing high-yield kraft pulps Part of this work was presented at the 2000 Tappi Pulping/Process & Product Quality Conference, Boston, USA, 2000 and divulgated through Tappi PULP/PPQ-CD-00","authors":"R. Mendonça, A. Guerra, A. Ferraz","doi":"10.1002/JCTB.569.ABS","DOIUrl":"https://doi.org/10.1002/JCTB.569.ABS","url":null,"abstract":"","PeriodicalId":15303,"journal":{"name":"Journal of Chemical Technology & Biotechnology","volume":"7 1","pages":"411"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87283556","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}
引用次数: 2
Chemical neutralization of acidic wastes using fly ash in Israel Paper presented at the PROGRES Workshop: Novel Products from Combustion Residues, 6–8 June 2001, Morella, Spain 论文发表于2001年6月6日- 8日，上海，上海
Journal of Chemical Technology & Biotechnology Pub Date : 2002-03-01 DOI: 10.1002/JCTB.567.ABS
M. Polat, Eli Lederman, I. Pelly, H. Cohen
{"title":"Chemical neutralization of acidic wastes using fly ash in Israel Paper presented at the PROGRES Workshop: Novel Products from Combustion Residues, 6–8 June 2001, Morella, Spain","authors":"M. Polat, Eli Lederman, I. Pelly, H. Cohen","doi":"10.1002/JCTB.567.ABS","DOIUrl":"https://doi.org/10.1002/JCTB.567.ABS","url":null,"abstract":"","PeriodicalId":15303,"journal":{"name":"Journal of Chemical Technology & Biotechnology","volume":"1 1","pages":"377"},"PeriodicalIF":0.0,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76967270","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}
引用次数: 1
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