响应曲面优化法合成CTMAB-膨润土吸附剂

Preparation of CTMAB-bentonite adsorbent with response surface methodology

采用响应曲面优化法(RSM)对CTMAB-膨润土废水处理吸附剂进行合成制备研究。以十六烷基三甲基溴化铵(CTMAB)为有机插层改性剂,通过该法设计得到了有机改性膨润土插层改性的最佳优化条件:CTMAB用量19.5%,反应温度70.5℃,反应时间1.8 h,pH 6.7,DDVP去除率94%,同时得到了合成该吸附剂的二次经验拟合模型(R2=0.9757)。通过验证性实验,发现在模型提供的最优水平下,有机膨润土对DDVP的平均去除率(92.6%)与预测最优值(94%)相吻合,表明所选模型准确、可靠。该方法为改性膨润土吸附剂的合成及其在废水处理和环境修复中的应用提供了依据。

Preparation of the CTMAB-bentonite wastewater adsorbent based on the modification of cetyltrimethylammonium bromide （CTMAB） with response surface methodology （RSM） was investigated. Based on the modification of CTMAB, the optimal preparation parameters of CTMAB-bentonite determined by response surface methodology （RSM） technology were found to be as follows： CTMAB dosage of 19.5%, reaction temperature of 70.5℃, reaction time of 1.8 h and pH of 6.7, and the quadratic experimental fitting model （R2=0.9757） was also obtained. The experimental values （92.6%） of removal by CTMAB-bentonite obtained under the predicted optimal conditions by confirmation experiments closely agreed with the results （94%） obtained from RSM and hence validated the findings of response surface optimization model. The method provides a basis for the synthesis of modified bentonite adsorbent and its use in wastewater treatment and environmental restoration.