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Photoelectrocatrocatalytic hydrolysis of starch by using sprayed ZnO thin films

Journal of Semiconductors 2013年第5期34卷 13-15页

作者： r.t.sapkal S.S.Shinde K.Y.rajpure C.H.Bhosale Electrochemical Materials Laboratory Department of PhysicsShivaji UniversityKolhapur-416004India

： thin films of zinc oxide have been deposited onto glass/FtO substrates at optimized 400 ℃ by using a chemical spray pyrolysis technique. Deposited films are characterized for their structural, morphological optical and photocatalytic activity by using XrD, an SEM, a UV-vis spectrophotometer, and a PEC single-cell reactor. Films are polycrystalline and have a hexagonal （wurtzite） crystal structure with c-axis （002） orientation growth perpendicular to the substrate surface. the observed direct band gap is about 3.22 eV for typical films prepared at 400 ℃. the photocatalytic activity of starch with a ZnO photocatalyst has been studied by using a novel photoelectrocatalytic process.

关键词： photoelectrocatalysis hydrolysis starch DNSA

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removal of Copper Ions from Acid Mine Drainage Wastewater Using Ion Exchange technique: Factorial Design Analysis

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Journal of Water resource and Protection 2010年第11期2卷 984-989页

作者： r. W. Gaikwad r. S. sapkal V. S. sapkal 不详

A factorial experimental design method was used to examine the “Cu2+” removal from acid mine drainage wastewater by ion exchange technique. Ion Exchange technique is preferred because of reduced sludge generation compared to conventional treatment techniques and better decontamination efficiency from highly diluted solutions. Factorial design of experiments is employed to study the effect of four factors pH (3, 5, and 6), flow rate (5, 10, 15 L/hr), resin bed height (20, 40 and 60 cm) and initial concentration of the metal (100, 150 and 200 mgl-1) at three levels. the efficiency of metal removal was determined after 100 min of treatment. Main effects and interaction effects of the four factors were analyzed using statistical techniques. A regression model was recommended and it was found to fit the experimental data very well. the results were analyzed statistically using the Student’s t-test, analysis of variance, F-test and lack of fit to define most important process variables affecting the percentage “Cu2+” removal. In this study , pH was thus found to be the most important variable.

关键词： Acid Mine Drainage Ion Exchange Heavy Metal Copper removal Factorial Design of Experiments

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