Cheng Zhengjun, Zhang Lei, Guo Xiao, Jiang Xiaohui, Li Tian
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China; School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China; Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637002, China.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China; School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Feb 25;137:1126-43. doi: 10.1016/j.saa.2014.08.138. Epub 2014 Sep 23.
Adsorptions of congo red and direct red 80 onto activated carbon/surfactant from aqueous solution were optimized. The Box-Behnken design (BBD) has been employed to analyze the effects of concentration of surfactant, temperature, pH, and initial concentration of the dye in the adsorption capacity. Their corresponding experimental data could be evaluated excellently by second order polynomial regression models and the two models were also examined based on the analysis of variance and t test statistics, respectively. The optimum conditions were obtained as follows: Cs=34.10 μM, T=50°C, pH=3.5, and CCR=160 mg/L for the congo red system, and Cs=34.10 μM, T=50°C, pH=6.1, and CDR80=110 mg/L for the direct red 80 system. And in these conditions, the measured experimental maximum adsorption capacities for the congo red and direct red 80 removals were 769.48 mg/g and 519.90 mg/g, which were consistent with their corresponding predicted values, with small relative errors of -2.81% and -0.67%, respectively. The adsorption equilibrium and kinetics for the two dye adsorptions onto AC/DDAC were also investigated. The experimental data were fitted by four isotherm models, and Langmuir model presented the best fit. The kinetic studies indicated that the kinetic data followed the pseudo-second-order model.
优化了刚果红和直接红80从水溶液中吸附到活性炭/表面活性剂上的过程。采用Box-Behnken设计（BBD）分析表面活性剂浓度、温度、pH值和染料初始浓度对吸附容量的影响。通过二阶多项式回归模型可以很好地评估其相应的实验数据，并且分别基于方差分析和t检验统计量对这两个模型进行了检验。得到的最佳条件如下：对于刚果红体系，Cs = 34.10 μM，T = 50°C，pH = 3.5，CCR = 160 mg/L；对于直接红80体系，Cs = 34.10 μM，T = 50°C，pH = 6.1，CDR80 = 110 mg/L。在这些条件下，测得的刚果红和直接红80去除的实验最大吸附容量分别为769.48 mg/g和519.90 mg/g，这与它们相应的预测值一致，相对误差分别为-2.81%和-0.67%，较小。还研究了两种染料在AC/DDAC上吸附的平衡和动力学。实验数据用四种等温线模型进行拟合，Langmuir模型拟合效果最佳。动力学研究表明，动力学数据符合准二级模型。
