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...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.展开更多
基金supported by the National Natural Science Foundation of China(no.21876119)the Fundamental Research Funds for the Central Universities(no.YJ201732)Sichuan Science and Technology Program(no.2018GZ0381).
文摘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.
