Cr(VI) containing industrial wastewaters are highly toxic and carcinogenic, and severely threats living creatures and the environment. Therefore, it is highly desired yet challenging to develop an available and economical adsorbent for simultaneously detoxifying Cr(VI) anions to Cr(III) ions and removing them from the wastewater. Here we propose a facile method for rapid removal of Cr(VI) ions from the wastewater by using a synthetic polydopamine microsphere (PPM) adsorbent with hierarchical porosity. The as-prepared PPM exhibits high Cr(VI) removal capacity of 307.7 mg/g and an outstanding removal efficiency. They can effectively decrease the Cr(VI) concentration to lower than 0.05 mg/L well below the limits for drinking water standard of WHO regulations in 60 s at pH 2. More importantly, PPMs can reduce the lethal Cr(VI) anions to Cr(III) ions with low toxicity, and simultaneously immobilize them on the matrices of PPMs.

中文翻译：

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快速制备分级多孔聚多巴胺微球以快速去除废水中的铬酸盐

含六价铬的工业废水具有剧毒和致癌性，严重威胁着生物和环境。因此，迫切需要开发一种既经济又经济的吸附剂，以同时将Cr（VI）阴离子解毒为Cr（III）离子并将其从废水中去除，这是极富挑战性的。在这里，我们提出了一种使用具有分层孔隙率的合成聚多巴胺微球（PPM）吸附剂从废水中快速去除Cr（VI）离子的简便方法。所制备的PPM具有307.7 mg / g的高Cr（VI）去除能力和出色的去除效率。它们可以有效地将Cr（VI）浓度降低至0.05 mg / L，低于pH值为2的60 s内WHO饮用水标准的限值。更重要的是，