화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.37, No.7, 1166-1173, July, 2020
DOI10.1007/s11814-020-0546-x  Export Citation
Rapid removal of low concentrations of mercury from wastewater using coal gasification slag
Liangyan Duan, Xiude Hu1, Deshuai Sun†, Yongzhuo Liu2, Qingjie Guo1, †, Tongkai Zhang, and Botao Zhang
  • College of Chemistry & Chemical Engineering, Qingdao University, Qingdao 266071, China
  • 1State Key Laboratory of High-efficiency Utilization of Coal & Green Chemical Engineering, Ningxia University, Yinchuan 750021, China
  • 2Key Laboratory of Clean Chemical Processing of Shandong Province, College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, China
E-mail:,
Coal gasification slag (CGS) is a carbon-containing solid waste used as an adsorbent to remove low concentrations of mercury from wastewater in a series of batch tests to assess its adsorption properties and safe storage. The results showed that the adsorption of mercury on CGS was a very rapid and efficient process, and adsorption equilibrium was reached in only 10-40 min. A pseudo-second-order kinetics model provided a better fit to the equilibrium data. The adsorption capacity on CGS was just slightly below the value of active carbon. CGS showed the highest mercury removal efficiency at a solution pH of 4. Although the presence of other metal cations and anions affected the adsorption, CGS showed good selectivity for mercury ions. The adsorption of mercury was not affected by low concentrations of Cr3+ or Cu2+. The negative interference of anions on the removal efficiency followed the order: Cl?>H2PO4 > CO3 2. The adsorption mechanism related to the functional groups included ion exchange, precipitation, coordination complexation, and surface complexation. Mercury adsorbed on CGS leached very slowly in weakly acidic or basic solution. All results of the study indicate that CGS is an economical and safe adsorbent for potential industrial applications.
Keywords:Coal Gasification Slag;Rapid Adsorption;Mercury;Low Concentration;Leaching
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