响应面法优化巴旦木壳对废水中Pb、Cu和Cd的吸附及同时测定

研究废弃巴旦木壳对模拟废水中Pb、Cu和Cd的去除率。在单因素实验的基础上,采用响应面法对吸附剂投加量、吸附时间和pH值3因素进行优化。实验结果表明,Pb、Cu和Cd分别在最佳吸附吸附剂投加量0.4 g,吸附时间49.38 min,pH值为9.96;吸附剂投加量0.4 g,吸附时间49.91 min,pH值为10.13;吸附剂投加量0.4 g、吸附时间49.83 min、pH值为10.42的条件下,去除率分别为87.42%、73.49%和85.11%。采用偏最小二乘法(PLS)对Pb、Cu和Cd模拟混合试样吸附后的溶液测定的曲线进行拟合回归,计算得出吸附剂对Pb、Cu和Cd的去除率分别为83.2%、66.0%和83.3%。用PLS对吸附后的模拟废水样品进行计算分析,并间接得出巴旦木壳对Pb、Cd和Cu的去除率和建立Pb、Cd、Cu三组分同时测定的多元校正分析方法。

Optimization of Adsorption of Pb,Cu and Cd in Wastewater by Almond Wood Shells and Its Simultaneous Determination by Response Surface Methodology

The removal rate of Pb,Cu and Cd in simulated wastewater by discarded almond wood shells was studied.On the basis of the single factor test,the response surface method was used to optimize the three factors such as adsorbent dosage,adsorption time and pH value.The experimental results show that the best adsorption conditions are Pb:the adsorbent dosage is 0.4 g,the adsorption time is 49.38 min,and the pH is 9.96;Cu:the adsorbent dosage is 0.4 g,the adsorption time is 49.91 min,and the pH is 10.13;Cd:the adsorbent dosage is 0.4 g,the adsorption time is 49.83 min,and the pH is 10.42,under these conditions,the removal rates of Pb,Cu and Cd are 87.42%,73.49%and 85.11%,respectively.Partial least squares method(PLS)was used to simultaneously determine the solution after adsorption of Pb,Cu and Cd simulated mixed samples.The calculated removal rates of Pb,Cu and Cd by the adsorbent were 83.2%,66.0%and 83.3%.Partial least squares(PLS)was used to calculate and analyze the sample of simulated wastewater after adsorption,and the removal rate of Pb,Cd and Cu by almond wood shells was obtained indirectly.