期刊论文

Removal of Cr(VI) from water by granular activated carbon supported nanoscale zero-valent iron

中文

过程工程学报

1009-606X

2019

19

4

714-720

10.12034/j.issn.1009-606X.218294

国家自然科学基金资助项目（编号:41773133）； 湖南省教育厅科研项目（编号:17A028）；

本校为第一机构

以Fe~(2+)溶液为原料、NaBH_4为还原剂,采用传统液相还原技术合成了颗粒活性炭(GAC)载纳米零价铁(nZVI)复合材料GAC-nZVI,用扫描电镜对GAC-nZVI进行表征,通过间歇实验考察了其对去除Cr(VI)的影响。结果表明,GAC能阻止nZVI颗粒聚集,合成的GAC-nZVI能有效去除水中的Cr(VI)。在Cr(VI)初始浓度50 mg/L、温度40℃和pH=2.0、投加GAC-nZVI 3.0 g/L的条件下反应5 min,Cr(VI)去除率为99.4%。pH=2.0~4.0时,处理后水中总铬浓度均低于1 mg/L,表明残留少量Cr(III)。随pH值和Cr(VI)浓度增加,Cr(VI)去除率降低;随反应温度和GAC-nZVI投加量增加,Cr(VI)去除率增加。准一级动力学模型可用于描述Cr(VI)的去除过程。...

The removal rate of Cr(VI) from water by using granular activated carbon (GAC) supported nanoscale zero-valent iron (nZVI) composites (GAC-nZVI) was studied through batch experiments. The GAC-nZVI composites were synthesized from Fe2+ aqueous solution by traditional liquid-phase reduction technique with NaBH4 as a reducing agent. The composites were characterized by SEM. The effects of pH value, reaction temperature, GAC-nZVI composites addition and initial Cr(VI) concentration on the removal rate of Cr(VI) were studied. The removal processes w...