贝壳粉绿色负载纳米铁去除水中的六价铬  

Remove of Cr(Ⅵ) in Water by Shell Powder Supported Nanoscale Zero-Valent Iron

作　　者：仝壮 罗盛旭 邓琴 王艳诗 邱丹 TONG Zhuang;LUO Shengxu;DENG Qin;WANG Yanshi;QIU Dan(College of Materials and Chemical Engineering,Hainan University,Key Laboratory of Ministry of Education of Advanced Materials of Tropical Island Resources,Haikou 570228,China)

机构地区：[1]海南大学材料与化工学院,热带岛屿资源先进材料教育部重点实验室,海南海口570228

出　　处：《水处理技术》2021年第8期38-42,共5页Technology of Water Treatment

基　　金：国家自然科学基金(21767008);热带岛屿资源先进材料教育部重点实验室开放基金项目资助(AM2017-11)。

摘　　要：为了降低制备成本,合成环境友好型的纳米零价铁(nZⅥ),并解决其易团聚和易氧化的难题,以贝壳粉(SP)为负载基、苦丁茶提取液为还原剂,合成了SP负载nZⅥ型复合材料(SP@nZⅥ),采用扫描电镜、傅里叶变换红外光谱、X射线衍射对SP@nZⅥ进行结构表征,并研究其对Cr(Ⅵ)的去除性能。结果表明,苦丁茶提取液能够成功制备SP@nZⅥ,nZⅥ可以均匀分散于SP表面,有效解决了nZⅥ易团聚的现象。相比未负载SP+nZⅥ的混合物,SP@nZⅥ对Cr(Ⅵ)的去除率提高53.47%。SP@nZⅥ投加量的越大、溶液pH越小越有利于Cr(Ⅵ)的去除,准2级动力学模型推断去除机理主要是SP@nZⅥ表面的活性点位与Cr(Ⅵ)发生氧化还原反应。In order to reduce the preparation cost, the environmentally friendly nano-zero-valent iron(nZⅥ) was synthesized and the problem of easy agglomeration and easy oxidation was solved. The shell powder(SP) was used as the base, and Kudingcha extract was used as the reducing agent, the SP-loaded nZⅥ composite(SP@nZⅥ) was synthesized, SP@nZⅥ was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction, and its removal performance of Cr(Ⅵ) was studied. The results showed that, SP@nZⅥ could be successfully prepared from Kudingcha extract, and nZⅥ could be evenly dispersed on SP surface, which effectively solved the phenomenon that nZⅥ was easy to agglomerate. Compared with the unloaded SP+nZⅥ mixture, the removal rate of Cr(Ⅵ) by SP@nZⅥ increased by 53.47%. The removal rate of Cr(Ⅵ) increased with the increase of SP@nZⅥ dosage and the decrease of solution pH. The quasi-second-order kinetic model inferred the removal mechanism mainly because the active sites on the surface of SP@nZⅥ and the redox reaction of Cr(Ⅵ).

关 键 词：贝壳粉 纳米零价铁 负载 绿色合成 Cr(Ⅵ) 

分 类 号：X703.1[环境科学与工程—环境工程]