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考察了时间、pH、温度、吸附剂投加量、无机阴离子等因素对磁黄铁矿去除As(V)过程的影响.同时,对去除过程的动力学和等温线进行分析,并探究了动态去除的效果.结果显示:磁黄铁矿对As(V)的去除在24 h达到平衡;在pH值3~9范围内去除率都达到80%以上;温度升高和吸附剂用量增加都对As(V)去除具有促进作用;PO_4~(3-)、SiO_3~(2-)、CO_3~(2-)对吸附有较强的抑制作用;在As(V)初始浓度为2 mg·L~(-1)时动态吸附出水浓度在150个吸附床体积(BV)内能达到国家饮用水标准;吸附去除过程符合拟二级动力学方程和Langmuir等温方程.能谱仪和X射线电子能谱分析表明,去除过程是一个自发吸热的配位离子交换反应.本实验表明,天然磁黄铁矿是一种有潜力的除砷吸附剂.
The effects of time, pH, temperature, adsorbent dosage, inorganic anions and other factors on As (V) removal of pyrrhotite were investigated.At the same time, the kinetics and isotherms of the removal process were analyzed, and the dynamic The results show that the removal of As (V) from pyrrhotite reaches a balance at 24 h, and the removal rate reaches above 80% at the pH range from 3 to 9. The increase of temperature and the increase of the amount of adsorbent (3), SiO 3 2-, CO 3 2- can strongly inhibit the adsorption of As (V), while the initial concentration of As (V) is 2 mg · L ~ (-1), the dynamic adsorption effluent concentration can reach the national drinking water standard within 150 bed volumes (BV), and the adsorption and removal process accords with the pseudo second-order kinetic equation and Langmuir isotherm equation.Energy dispersive spectroscopy and X-ray electron energy Spectral analysis showed that the removal process is a spontaneous endothermic coordination ion exchange reaction.The experiment shows that natural pyrrhotite is a potential arsenic removal agent.