响应面法优化羧甲基壳聚糖-膨润土复合吸附剂对Cu^(2+)的吸附

Optimizing adsorption of Cu(Ⅱ) using carboxymethyl chitosan-bentonite compound adsorbent by response surface methodological approach

用羧甲基壳聚糖-膨润土复合吸附剂吸附处理模拟含铜废水,在pH为6,吸附30 min达到吸附平衡,吸附容量为114.54 mg·g-1。通过三因素三水平中心组合试验设计及响应面分析法,对各因素的影响作用进行了分析,结果表明各因素对吸附容量影响的重要性依次为初始浓度﹥pH值﹥吸附时间。研究优化了复合吸附剂对铜离子吸附工艺参数,得出吸附最优条件:pH值为6.00,初始浓度为33.00 mg·L-1,吸附时间为25.00 min。在此条件下吸附容量为111.81 mg·g-1,与理论值较吻合。

The treatment performances and impact factors of simulated wastewater containing copper using carboxymethyl chitosan-bentonite composite adsorbent were introduced. The results showed that the absorption equilibrium could reach 114.54 mg·g^-11 after 30 min at pH 6. The significant factors for the adsorption capacity was determined by the three-factors and three-levels center combination test design and response surface analysis, and among the factors, initial concentration played the most important role, then pH value and adsorption time in turn. By the optimization of adsorption process parameters, the optimum experimental condition is initial concentration of 33.00 mg.L^-1, pH value of 4, adsorption time for 25.00 min, and adsorption capacity is 111.81 mg.g^-1, which is consistent with the theoretical value.