摘要
以净水污泥为原料,采用NaBH_4液相还原Fe(NO_3)_3·9H_2O的方法制备了净水污泥负载零价纳米铁(WS-nZVI)吸附剂,并用于去除含铬废水中的Cr(VI)。考察了Cr(VI)溶液的pH值、WS-nZVI投加量、Cr(VI)溶液初始浓度等因素对WS-nZVI去除Cr(VI)的效果影响,同时与还原铁粉、原泥进行了去除Cr(VI)的对比实验。采用SEM、BET、XRD和FTIR对WS-nZVI进行表征。实验结果表明:WS-nZVI去除Cr(VI)的效果要好于还原铁粉和原泥,当作用时间为3.5 h,WS-nZVI投加量为10 g/L时对Cr(VI)的去除效果最佳。利用净水污泥的吸附性能和零价纳米铁的还原性能协同作用,可将溶液中Cr(VI)还原为Cr(III)后吸附去除。
Na＇no-iron adsorbent supported purified water sludge （WS-nZVI） was prepared by liquid-phase reduction of Fe（ NO3 ）3 ＂ 9H20 with NaBH4 for the removal of Cr （VI） in wastewater containing chromium. The effects of factors such as the pH value of Cr（VI） solution, dosing of WS-nZVI, and the initial concentration of Cr（VI） on removal of Cr（VI） by WS-nZVI were investigated. Meanwhile, a comparative experiment on Cr （VI） removal by WS-nZVI and reduced iron powder, raw sludge was carried out. WS-nZVI was characterized by means of SEM,BET,XRD and FTIR. The results indicated that WS-nZVI was better than reducing iron powder and raw mud in removing Cr （VI）. When the time was 3.5 h and its dosage was 10 g/L, WS- nZVI had the best effect on the removal of Cr （VI）. Through the synergistic effect of the adsorption of waterworks sludge and the reduction of zero-valent nano-iron, Cr（VI） in the solution was reduced to Cr（III） , and then was adsorbed.
作者
江宇
朱加豆
李荣
王东田
JIANG Yu1 , ZHU Jia-dou 1 , LI Rong1 , WANG Dong-tian1,2(1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China 2. School of Chemistry, Biology and Materials Engineering, Suzhou University of Science and Technology, Suzhou 215009, China)
出处
《环境工程》
CAS
CSCD
北大核心
2018年第9期16-20,共5页
Environmental Engineering
基金
国家自然科学基金"净水污泥吸附剂的制备及吸附去除废水中氨氮的行为与机制"(51778392)
苏州科技大学研究生科研创新计划项目"净水污泥负载零价纳米铁对水中Cr(VI)去除"(SKCX17_016)
