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标题：Optimization Conditions for Increasing Cation Exchange Capacity of Coal Fly Ash Zeolite Modified with Chitosan Using Box-Behnken Design
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作者：Pathanin Sangaroon ; Thares Srisatit ; Pongsert Sriprom 等
期刊名称：EnvironmentAsia
印刷版ISSN：1906-1714
出版年度：2019
卷号：12
期号：2
页码：58-68
DOI：10.14456/ea.2019.27
出版社：Thai Society of Higher Eduction Institutes on Environment
摘要：The optimization conditions of high Cation Exchange Capacity (CEC) of coal fly ash (CFA) zeolitemodified with chitosan were studied. The experimental design had employed Box-Behnkendesign with 3 factors at 3 levels. The independent variables were chitosan concentration (5-15g/L), retention time (12-36 hours), and temperature (40-60ºC). It is resulted that the independentvariables of chitosan concentration had significant effect to CEC at 95% confidence (P<0.05). Invice versa, retention time and temperature had no significant effect to CEC at 95% confidence(P>0.05). However, the interaction effect between chitosan concentration with retention time andretention time with temperature had significant effect to CEC at 95% confidence (P<0.05) Thus,the optimum conditions of high CEC (474.21 meq/100g) were 15 g/L of chitosan concentration,36 hours of retention time, and 40ºC of temperature. Regarding with 3 times of validation forsuch optimum conditions, CEC was 474.21± 5 meq/100g which was closely the predicted value.CEC of chitosan modified with CFA-zeolite had CEC more than CFA-zeolite (272.12 meq/100g)about 2 times, indicating chitosan was the appropriate material for increasing CEC on CFA-zeolite.
关键词：Coal fly ash; Cation exchange capacity; Response surface methodology; Box;Behnken;Design; Zeolite