生物炭负载零价纳米铁对溶液中的 Cr6+ 去除的研究

生物炭(biochar, BC)作为载体,负载纳米零价铁(nano zero valent iron, nZVI)形成复合吸附材料,利用电子扫描显微镜(SEM)和X射线衍射仪(XRD)表征材料的结构特征。研究了不同材料、初始溶液初始p H、不同初始浓度、去除剂的投加量对BC负载nZVI (nZVI-BC)去除含Cr~(6+)废水的影响。结果表明:BC的加入提高了nZVI的分散性和抗氧化性,同时提升稳定性,对于水中Cr~(6+)的去除具有较好的效果;当Cr~(6+)的初始浓度为15 mg/L,去除剂的投加量为2.5 g/L, pH=4的条件下,其去除率达到了98%; nZVI-BC去除含Cr~(6+)废水的过程符合Langmuir吸附等温式和准一级动力学方程,其中最大吸附量为209.93 mg/g。

Study on Removal of Cr6+ in Solution by Nano Zero-Valent IronSupported on Biochar

Biochar (BC) was used as a carrier, and nano zero valent iron (nZVI) was supported to form a composite adsorbent. Thestructural characteristics of the material were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Theeffects of different materials, initial pH of initial solution, different initial concentrations and dosage of remover on the removal ofCr⁶⁺ wastewater by BC supported nZVI (nZVI-BC) were studied. The results show that the addition of BC improves the dispersibility,oxidation resistance of nZVI and the stability. It has a good effect on the removal of Cr⁶⁺ in water. When the initial concentration ofCr⁶⁺is 15 mg/L, the addition of the remover is 2.5 g/L and the value of pH is 4, the removal rate is up to 98%; the removal rate of Cr⁶⁺wastewater by nZVI-BC accords with Langmuir adsorption isotherm and pseudo-first-order kinetic equation, the maximum adsorptionamount is 209.93 mg/g.