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目的分析纳米二氧化锰α-MnO2吸附饮用水中三价砷(As(Ⅲ))、五价砷(As(Ⅴ))的影响因素。方法以高锰酸钾、硫酸锰、过硫酸铵等为主要原料,制得纳米α-MnO2,控制pH、温度、砷初始浓度和时间,采用静态吸附除砷实验,探讨除砷效果和能力。结果随着吸附时间延长,二氧化锰对砷的去除率缓慢上升,10min时即可达到吸附平衡;随着砷初始浓度的升高,吸附率呈降低的趋势;随着温度的升高,水中各形态砷的去除率随之升高;pH值越低,吸附率越高,去除砷的效果越好。结论吸附过程受pH、温度、砷初始浓度和时间的影响,在常温下,pH值小于7时吸附超过20min即可获得良好去除效果。
Objective To analyze the influencing factors on the adsorption of As (Ⅲ) and pentavalent arsenic (As (Ⅴ)) in drinking water by α-MnO2 nanomaterials. Methods Nanometer α-MnO2 was prepared by using potassium permanganate, manganese sulfate and ammonium persulfate as the main raw materials. The pH, temperature, initial concentration and time of arsenic were controlled. Static arsenic removal experiment was carried out to study the effect and abilities of arsenic removal. Results With the prolongation of adsorption time, the removal rate of arsenic from manganese dioxide increased slowly and the adsorption equilibrium reached at 10 min. The adsorption rate decreased with the increase of initial arsenic concentration. With the increase of temperature, The removal rate of arsenic in various forms will increase accordingly; the lower the pH value, the higher the adsorption rate, the better the arsenic removal effect. Conclusion The adsorption process is affected by pH, temperature, initial concentration of arsenic and time. At room temperature, when the pH value is less than 7, it can be adsorbed for more than 20min to obtain a good removing effect.