Effect of competitive adsorption on zinc removal from aqueous solution and zinc smelting effluent by eucalyptus leaf-based magnetic biosorbent. Issue 9 (29th July 2017)

• Record Type: Journal Article
• Authors: Chen, Cheng; Tang, Yankui; Liu, Yuyang; Liang, Yuanzhang; Zhang, Kaixuan; Wang, Shengye; Liang, Yan
• Is Part Of: Journal of environmental science and health. Volume 52:Issue 9(2017)
• Page Start: 873
• Page End: 889
• Publication Date: 2017-07-29
• Subjects: Competitive adsorption -- magnetic biosorbent -- smelting effluent -- zinc removal; Environmental engineering -- Periodicals; Environmental sciences -- Periodicals; Ecology -- periodicals; Hazardous Substances -- periodicals; 628
• DOI: 10.1080/10934529.2017.1316168
• Languages: English
• ISSNs: 1093-4529

Abstract

ABSTRACT: The objectives of this study were to investigate the competitive sorption behaviors and mechanisms of heavy metals onto ELMB, a novel eucalyptus-leaf-based magnetic biosorbent, and to study the potential application of ELMB in the treatment of actual zinc smelting effluent after a necessary pretreatment process. ELMB and ELMB-metals systems were characterized using several techniques. Competitive sorption of Zn 2+ with Pb 2+, Cu 2+ and Cd 2+ onto ELMB was studied by batch experiments and the used sorbent was separated under a magnetic field. The results show that the ELMB can be considered as paramagnetic material with various functional groups on its surface. The presence of Pb 2+, Cu 2+ and Cd 2+ significantly decreases the sorption of Zn 2+ in either the binary system or multimetal systems. The order of adsorption preference is Pb 2+ > Cu 2+ > Cd 2+ > Zn 2+ in multimetal systems and the sequence of competitive ability to zinc is: Pb 2+ > Cu 2+ > Cd 2+ . Non-competitive Langmuir multicomponent isotherm model fits to the adsorption data of Pb 2+ and Cu 2+ well in aqueous solution. The co-existent Ca 2+ and SO4 2− decrease the removal efficiencies of heavy metals while the presence of Na + and Cl − shows little effect in the multimetal solution. In the case of actual zinc smelting effluent, "pretreatment + ELMB sorption" is successfully applied to remove heavy metals and the contents of Zn 2+ and its associated metals are well below discharge limits.