中药渣生物炭的制备及其对水中六价铬离子的吸附实验研究

Experimental Study on the Adsorption of Hexavalent Chromium ions by Chinese Medicinal Residue Biochar

研究不仅能够解决水中六价铬离子污染问题也可以解决中药废渣处理问题。首先,将中药渣制备成生物炭,然后进行单因子吸附实验,包括确认重铬酸钾溶液的初始浓度、吸附反应时间、吸附剂用量、吸附反应温度及pH值等为变量,最后进行吸附模型拟合和正交实验。研究结果表明,单因子实验最佳条件结果如下:重铬酸钾溶液的初始浓度50 mg/L,反应时间3 h,投加生物炭量0.6 g、温度为30℃,pH值为5;正交实验表明各因子主次影响为初始浓度>投加量>pH值;吸附等温线Langmuir模型拟合效果更好。

This study can deal with hexavalent chromium ion pollution and solve the problem of traditional Chinese medicine waste residue treatment.Firstly,biochar was prepared from Chinese medicine residue,and then the single factor adsorption experiment was carried out with the initial concentration of Cr(VI),the reaction time,the adsorption dose,the adsorption temperature and the pH value as variables.Finally,the adsorption model fitting and orthogonal experiments were carried out.The optimal results of the single factor experiment were as follows:the concentration of Cr(VI) was 50 mg/L,the reaction time was 3 h,the amount of biochar was 0.6 g,the pH value was adjusted to 5,and the temperature was 30 ℃.