Abstract：The reduction of Chromium(VI) by Fe0 nanoparticles (nZVI) was carried out. At the same time, the inhibitory role of humic acid (HA) on the reduction of Cr(VI) by nZVI and the elimination of its inhibitory role by starch were evaluated. Our experimental results indicated that with the initial HA concentration increased from 0 to 5, 10, 15, 20, 30 mg/L, the removal efficiencies of Cr(VI) arrived at 91.9 %, 82.6 %, 78.6 %, 70.4 %, 70.0 % and 69.4 % in 10min, respectively. Indicating the effects of HA to Cr(VI) reduction by nZVI was dual. On the one hand, HA adsorbed on the surface of nZVI, which would occupy the active surface sites for Cr(VI) reduction and the accumulation of adsorbed HA on the nZVI surface might reduce the Cr(VI) reduction rate. On the other hand, the function in HA might act as electron shuttle promoting electron transfer, this would have a positive effective enhancing the reduction of Cr(VI) by nZVI. Generally speaking, the sorption behaviors of HA on the nZVI particle’s surface played a dominant role for the nZVI’s high specific surface areas, which resulted in the inhibitory role of HA on the reduction of Cr(VI) by nZVI. Appropriate content of starch could prevent agglomeration of nZVI and prevent the adsorption of HA on nZVI particles enhancing a state of dispersion which could maintain the reactivity of nZVI. To great extent, the starch addition at a dose of 0.5 g/L could eliminate the inhibitory role of HA.
张珍, 沈珍妙, 范天恩, 徐新华. 腐植酸对nZVI去除水中Cr(VI)的抑制及抑制作用的消除[J]. 中国环境科学, 2013, 33(1): 63-68.
ZHANG Zhen, SHEN Zhen-Miao, FAN Tian-恩, XU Xin-Hua. The inhibitory role of humic acid on the reduction of Cr(VI) by Fe0 nanoparticles and the elimination of its inhibitory role. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(1): 63-68.
