桂林理工大学学报2016，Vol.36Issue(4)：754-764,11.DOI:10.3969/j.issn.1674-9057.2016.04.018
蔗渣炭/氧化铁复合吸附剂的制备及其吸附As(Ⅴ)的机理
Preparation of bagasse biochar/iron oxide composite adsorbent and its adsorption mechanism of As (Ⅴ) from aqueous solution
摘要
Abstract
Bagasse Biochar/Iron Oxide Composite Adsorbent (BCIA) was prepared from sugarcane bagasse by precipitation method.The adsorption capacity for As (Ⅴ) on the BCIA was measured in a series of batch adsorption experiments.The adsorption mechanism of As(Ⅴ) from aqueous solution onto BCIA was investigated using Fourier Transform Infrared Spectroscopy (FTRI) and X-ray Photoelectron Spectroscopy (XPS).The results show that the Specific surface area of BCIA is 81.94 m2/g,and the point of zero charge values of BCIA was 6.2.The pH range for optimal As(Ⅴ) adsorption was between 3.0 and 7.0.The adsorption process followed the pseudo-second order model.The As (Ⅴ) adsorption isotherm could be well fitted with the Langmuir model.The FFIR anslysis indicated that the oxygen-containing functional groups presented abundantly on the external and internal surfaces of BCIA,which could provide numerous chemical sorption sites and thereby increased the sorption capacity of BCIA.XPS analysis showed that oxygen-containing functional gToups,carboxyl oxygen (-O-C=O,533.4 eV)and carbonyl oxygen (=C=O,530.6 eV) were involved in adsorption.Iron oxide in BCIA played the key role in the As(Ⅴ) adsorption process.The As(Ⅴ) adsorbed on BCIA surface existed mainly as HAsO42-.关键词
砷/蔗渣炭/氧化铁/砷吸附/机理Key words
arsenic/bagasse biochar/iron oxide/arsenic(Ⅴ) adsorption/mechanism分类
资源环境引用本文复制引用
梁美娜,王敦球,朱义年,朱宗强,肖瑜,朱林,李欢欢..蔗渣炭/氧化铁复合吸附剂的制备及其吸附As(Ⅴ)的机理[J].桂林理工大学学报,2016,36(4):754-764,11.基金项目
国家自然科学基金项目(21367010) （21367010）
广西科技开发项目(桂科攻14124004-3-3) （桂科攻14124004-3-3）
广西自然科学基金项目(2014GXNSFBA118054) （2014GXNSFBA118054）
