载铁生物炭复合材料吸附固定Cr(VI)的性能研究

Study on Immobilization of Cr(VI)by Iron Loaded Biochar Composite

针对化工行业产生的含铬废水导致的坏境污染问题,分别以葡萄籽和小麦秸秆为原料制备了载铁生物炭复合材料用于废水中Cr(VI)的去除,探究了不同吸附材料、载铁生物炭投加量、Cr(VI)初始浓度、共存离子、pH值等对Cr(VI)的去除影响。结果表明载铁葡萄籽生物炭复合材料(nZVI@GSB)具有最强的Cr(VI)去除能力。在最佳反应条件下(1 g/L投加量、1 mg/L Cr(VI)浓度、pH=3),nZVI@GSB对Cr(VI)的最大吸附率为93.8%。以上结果表明载铁葡萄籽生物炭复合材料是一种有前景的Cr(VI)吸附固定材料。

Grape seed and wheat straw biochar(GSB and WSB)and their iron-based composites(nZVI@GSB and nZVI@WSB)were prepared.Then the effects of different adsorbents,dosage,Cr(VI)initial concentration and pH on Cr(VI)immobilization from aqueous solutions were investigated.The results showed that the nZVI@GSB had the highest Cr(VI)removal efficiency.Under the optimal reaction conditions(1 g/L of dosage,1 mg/L of Cr(VI)and pH=3),the maximum adsorption rate of nZVI@GSB for Cr(VI)was 93.8%.These findings indicated that nZVI@GSB composite was a promising material for Cr(VI)adsorption and immobilization.