توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Optimization of Cu and Zn Removal from Wastewater Using pre–treated Oil Palm Frond (OPF) by Response Surface Methodology
اطلاعات انتشار: هفتمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۹
An increase in the usage of heavy metals in various industrial processes results in increasing heavy metal wastes that need further treatment . To deserver removal from the effluent , Cu and Zn remain hazardous even at low concentration . the potential of oil palm frond (OPF) pre–treated with alkaline wash as a sorbent to remove Cu and Zn from aqueous solution was investigated in this study. 2g of OFB was treated for 300 min in a 250 ml 1.0M NaOH solution to improve its sorption ability. Response Surface Methodology (RSM) based on Three on Three – Variable Composite Face Centered Design was employed as an experimental design in order to evaluate the effect of initial Zn and Cu concentration (5–100 mg\l) , pH solution (2–9) and biomass loading (0.5–2g) on the sorption process under normal room temperature (25C) The solution pH, initial metal concentration and biomass loading were used as the main process variables , while the sorption performance was based on removal efficiency of two metals. Thecoefficient for determination, R2– for the removal was found to be 0.96 and 0.97 for Cu and Zn respectively . The initial concentration of 89 mg\l, biomass loading of 1.7g and initial pH of 4.5 were been found to be the optimum conditions for the maximum removal of Cu (89.75%) the optimum conditions for highest Zn removal were found to be initial concentration of 76 mg\l, biomass loading of 1.7 and initial pH of 5.5, to reach the Zn removal of 77.3%.<\div>

۲OPTIMIZATION OF LIPASE IMMOBILIZATION ON TO GLUTARALDEHYDE–CHITOSAN BEADS
اطلاعات انتشار: سومین همایش ملی تکنولوژی های نوین در شیمی، پتروشیمی و نانو ایران، سال
تعداد صفحات: ۸
Industrial application of lipase requires efficient methods to immobilize the enzyme, yielding a biocatalyst with high activity and stability compared to free lipase. In the present study, porcine pancreas lipase was immobilized to chitosan beads utilizing its amino group. Lipase was first immobilized to chitosan beads by activating its amino groups with glutaraldehyde. The glutaraldehyde concentrations based on immobilization efficiency of lipase on chitosan bead were optimized. The maximum immobilization efficiency nearly 70% was obtained in value of 3% v\v glutaraldehyde concentration. The optimum pH and temperature of immobilized lipases on chitosan bead and chitosan bead activated by glutaraldehyde were determined as the immobilization efficiency under the variety of pH (50 mM phosphate buffer for pH 6.5–8.5) and temperature (20–40°C). Similar optimum temperature (40°C) was found for both chitosan bead and chitosan bead activated by glutaraldehyde. In compare of chitosan bead, the optimum pH for the immobilized lipase on chitosan bead activated by glutaraldehyde was slightly shifted toward acidic region (6.5).<\div>
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