镁铝层状超分子化合物去除废水中的六价铬

发布时间：2018-06-24 13:07

本文选题：镁铝层状超分子化合物 + 记忆效应　；参考：《应用化学》2017年01期

【摘要】：实验比较了Na_2CO_3/Na OH、Na OH和NH4OH沉淀法制备的镁铝层状化合物对模拟废水中Cr(Ⅵ)的去除效果,并通过X射线衍射和Brunauer-Emmett-Teller(BET)方法分析了材料的结构特征。结果表明,以Na_2CO_3/Na OH为沉淀剂制备的镁铝层状化合物结晶度高、层状结构完整、比表面积较大、孔径适宜、吸附Cr(Ⅵ)的效果最佳,其优化吸附工艺为:固液比为1 g/500 m L,体系pH值为7~9,室温下震荡9 h。在最佳吸附条件下,镁铝层状化合物对Cr(Ⅵ)的饱和吸附量达到199.4 mg/g。镁铝层状化合物通过与含铬阴离子形成层状超分子化合物的方式实现了废水中铬的去除,对含Cr(Ⅵ)226.1 mg/L的实验室废水经6次工艺处理后,残余量小于0.5 mg/L,低于国家污水综合排放标准(GB8978-1996)指标。镁铝层状化合物是一种处理实验室废水中Cr(Ⅵ)的优良吸附剂。
[Abstract]:The results of the removal of Cr (VI) in simulated wastewater by Na_2CO_3/Na OH, Na OH and NH4OH precipitation method were compared. The structural characteristics of the materials were analyzed by X ray diffraction and Brunauer-Emmett-Teller (BET) method. The results showed that the crystallinity of the magnesia aluminum layered compound prepared with Na_2CO_3/Na OH as precipitant was high. The optimum adsorption process is that the solid to liquid ratio is 1 g/500 m L, the pH value of the system is 7~9, and the 9 h. at room temperature is at the best adsorption condition. The saturated adsorption of Cr (VI) to Cr (VI) is reached by 199.4 mg/g. magnesia aluminum layered compound through the chromic anion separation. The formation of stratiform supramolecular compounds has achieved the removal of chromium in the wastewater. The residual amount of the laboratory wastewater containing Cr (VI) 226.1 mg/L is less than 0.5 mg/L after 6 process treatment, which is lower than the national wastewater discharge standard (GB8978-1996). The magnesium aluminum layered compound is an excellent adsorbent for treating Cr (VI) in laboratory wastewater.
【作者单位】：成都理工大学材料与化学化工学院矿产资源化学四川省高校重点实验室;
【基金】：四川省科技厅科技支撑项目(2015GZ0243) 四川省教育厅重点项目(15ZA0071)~~
【分类号】：X703

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