基于弱相互作用力的共混型吸附剂去除六价铬离子

Blended Adsorbents Based on Weak Interaction Forces for Removing Hexavalent Chromium Ions

本研究采用聚乙二醇(PEG)与单宁酸(TA)的氢键和范德华力等弱相互作用力制备了一种新型混凝剂。在Fe2+的辅助下,Cr(Ⅵ)可在中性条件下形成沉淀。Cr(Ⅵ)质量浓度在2 h内可由100 mg/L降至<0.1 mg/L。且Fe2+的用量缩减为目前工业技术的1/3。去除过程涉及氧化还原-螯合、电荷相互作用和物理包裹等多种相互作用。由于反应条件温和、去除效率高,有望成为一种具有较大应用前景的新型除铬技术。

This study prepared a new type of coagulant using weak interactions such as hydrogen bonding and van der Waals forces between polyethylene glycol(PEG)and tannic acid(TA).With the assistance of Fe2+,Cr(VI)can form precipitates under neutral conditions.The mass concentration of Cr(VI)can be reduced from 100 mg/L to<0.1 mg/L within 2 hours.And the amount of Fe2+used has been reduced to one-third of the current industrial technology.The removal process involves various interactions such as oxidation-reduction chelation,charge interaction,and physical encapsulation.Due to mild reaction conditions and high removal efficiency,it is expected to become a new type of chromium removal technology with great application prospects.