活性染料K-2BP、KN-B和KN-R在椰壳活性炭上的脱色性能  

Decolorization of K-2BP,KN-B and KN-R onto activated carbon derived from coconut shell

作　　者：钱永[1,2] 龚菁[1] 庄俊涛[1] 吴磊[1] 王建军[1] 杨海[1] 

机构地区：[1]苏州科技大学化学与生物工程学院,苏州215009 [2]江苏省环境功能材料重点实验室,苏州215009

出　　处：《环境工程学报》2013年第6期2225-2232,共8页Chinese Journal of Environmental Engineering

基　　金：住房和城乡建设部2011年科学技术项目计划(2011-K4-2);环境化学与生态毒理学国家重点实验室开放基金项目(KF2010-11);苏州市应用基础研究计划项目(SYG201123)

摘　　要：开展椰壳活性炭对活性染料K-2BP、KN-B和KN-R的吸附脱色研究。发现K-2BP、KN-B和KN-R在该型活性炭上的吸附脱色率均随初始pH值的降低、温度的升高、染料初始浓度的降低、活性炭用量的增加以及NaCl盐度的增加而增加。在pH=7和T=25℃下,K-2BP、KN-B和KN-R在活性炭上的等温吸附规律符合Langmuir模型方程,最大饱和吸附量Qmax分别为263.15、256.41和250 mg/g,吸附自由能△G298 K分别为-10.632、-3.783和-2.805 kJ/mol;该条件下K-2BP、KN-B和KN-R的动力学吸附规律均符合准一级动力学吸附方程。等温吸附研究和吸附动力学研究均表明,相同条件下3种活性染料在该型活性炭上的吸附效果由高到低的顺序为:K-2BP>KN-B>KN-R。Adsorption of reactive dye K-2BP, KN-B and KN-R onto activated carbon derived from coconut shell was investigated, It was found that the decolorization efficiencies of K-2BP, KN-B and KN-R on the activa- ted carbon all increase with the increase of temperature, doses of activated carbon and NaC1 concentration and with the decrease of initial pH and initial reactive dye concentration. Under pH = 7 and T = 25~C , the adsorption isotherm study indicated that the equilibrium data are successfully fitted to Langmuir adsorption isotherm with the Qmax of K-2BP, KN-B and KN-R are 263.15, 256.41 and 250 mg/g, respectively, and the adsorption A G298 K of the three dyes are calculated as -10. 632, -3. 783 and -2. 805 kJ/mol, respectively. Under the same con- ditions as that of adsorption isotherm, the kinetic studies indicated that the adsorption rate data of the three reac- tive dyes can be explained by pseudo first-order kinetic model. According to the studying results of adsorption iso- therm and kinetics, the order of adsorbing decolorization effect of the reactive dyes from high to low is as K-2BP 〉 KN-B 〉 KN-R

关 键 词：活性染料 活性炭 吸附 脱色 

分 类 号：X506[环境科学与工程—环境工程]