• 文献标题:   Effective removal of inorganic mercury and methylmercury from aqueous solution using novel thiol-functionalized graphene oxide/Fe-Mn composite
  • 文献类型:   Article
  • 作  者:   HUANG Y, GONG YY, TANG JC, XIA SY
  • 作者关键词:   mercury, methylmercury, sorption, thiolfunctionalized graphene oxide/femn, remediation
  • 出版物名称:   JOURNAL OF HAZARDOUS MATERIALS
  • ISSN:   0304-3894 EI 1873-3336
  • 通讯作者地址:   Jinan Univ
  • 被引频次:   25
  • DOI:   10.1016/j.jhazmat.2018.11.074
  • 出版年:   2019

▎ 摘  要

A novel thiol-functionalized graphene oxide/Fe-Mn (SGO/Fe-Mn) was investigated for aqueous Hg2+ and CH3Hg + removal. Mercury were removed mainly through ligand exchange and surface complexation with surface active sites (i.e., -SH, -OH, O-C=O, C=C, Si-O, and pi-pi bond). SH had the strongest binding ability with mercury, forming sulfur-containing organic matter or polymers with Hg2+, and sulfur-containing organometallic compounds or thiolate-like species with CH3Hg+. The BET sorption isotherm model well simulated the sorption isotherm data of Hg2+ (R-2= 0.995, q(m)=233.17 mg/g) and CH3Hg+ (R-2=0.997, q(m)=36.69 mg/g), indicating a multilayer adsorption process. The mercury uptake was promoted with the increase of 3-MPTS content, adsorbent dosage, and pH (< 5.5), whereas the uptake was inhibited by high pH (> 5.5) and high concentrations of humic acid and electrolytes. SGO/Fe-Mn demonstrated high mercury uptake in simulated surface water/groundwater and in the presence of Pb, Cu, Ni, Sb, Cd and Zn. The mercury-laden SGO/Fe-Mn can be successfully regenerated and reused for three times with 98.1% and 67.0% of original Hg2+ and CH3Hg+ sorption capacity when 5% thiourea + 2 M KI was used as the desorbing agent. This study demonstrates potential and viability of SGO/Fe-Mn for mercury remediation.