农业资源与环境学报2016，Vol.35Issue(6)：1153-1159,7.DOI:10.11654/jaes.2016.06.018
Ca/CTS/FA复合材料对酸性大红的吸附研究
Adsorption of acid scarlet 3R by Ca/CTS/FA composite from aqueous solution
摘要
Abstract
Dye-containing wastewater has caused severe water pollution. In this study, a new adsorbent, Ca/CTS/FA composite prepared by loading chitosan and calcium ion onto fly ash was used to remove acid scarlet 3R(AS 3R)from aqueous solution. The optimum adsorption con-ditions and adsorption properties were investigated. Adsorption kinetics and thermodynamics and recycling of the composite adsorbent were discussed. Results showed that solution pH, adsorbent rate, contact time and oscillation frequency all affected AS 3R adsorption. The ad-sorption process could be well described by pseudo-second-order kinetic equation(R2=1.00). The isotherm data were fitted the Langmuir, Fre-undlich and D-R models, with Langmuir model being better than others. The average adsorption energy obtained by D-R model, the appar-ent activation energy and thermodynamic results showed that AS 3R was adsorbed through chemisorption, physical adsorption and hydrogen bonding. The negative values of adsorption Gibbs free energy changes(△G)and the positive values of adsorption enthalpy changes(△H)in-dicated that the adsorption process of AS 3R had spontaneous and endothermic nature. The FA/CTS/Ca material could be regenerated by 0.01 mol·L-1 NaOH solution and reused at least 8 times for dye removal from aqueous solution. The regeneration rates were higher than 99%.关键词
粉煤灰/壳聚糖/复合材料/酸性大红3R/吸附Key words
fly ash/chitosan/composite material/acid scarlet 3R/adsorption分类
环境科学引用本文复制引用
韩双艳,李北罡..Ca/CTS/FA复合材料对酸性大红的吸附研究[J].农业资源与环境学报,2016,35(6):1153-1159,7.基金项目
国家自然科学基金资助项目（21167011）；内蒙古自然科学基金资助项目 （）
