Adsorption of Cu(II) and Ni(II) on solid humic acid from the Azraq area, Jordan

Journal of Colloid and Interface Science
Bassam El-Eswed, Fawwaz Khalili

Abstract

Isotherms of adsorption of Cu(II) and Ni(II) onto solid Azraq humic acid (AZHA) were studied at different pH (2.0-3.7) values and 0.1 M NaClO4 ionic strength. The Langmuir monolayer adsorption capacity was found to range from 0.1 to 1.0 mmol metal ion/g AZHA, where Cu(II) has higher adsorptivity than Ni(II). The previously reported NICA-Donnan parameters for sorption of Cu(II) on HA fit the amount of Cu(bound) determined in the present study at pH 3.7 but underestimates those at pH values of 3.0, 2.4, and 2.0. The contribution of low affinity sites to binding of metal ions increases with decreasing pH and increasing metal ion loading. The aggregation of HA, which is facilitated by decreasing pH and increasing metal loading, may increase the ability of low-affinity sites to encapsulate metal ions. The binding of Ni(II) to HA exhibits less heterogeneity and less multidentism than that of Cu(II). AZHA loaded with Cu(II) and Ni(II) was found to be insoluble in water with no measurable amount of desorbed metal ions.

Citations

Nov 9, 2012·Archives of Environmental Contamination and Toxicology·Aleicia HollandSusan H W Kinnear
Feb 13, 2010·Journal of Hazardous Materials·Ying LiBaoyu Gao
Mar 27, 2009·Journal of Hazardous Materials·O CelebiH N Erten
Mar 31, 2009·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Xiaoping SongYunhui Dong
May 21, 2008·Journal of Hazardous Materials·Martina HavelcováMiloslav Pekar
Nov 20, 2013·Environmental Toxicology and Chemistry·Aleicia HollandSusan H W Kinnear
Apr 1, 2016·Environmental Science and Pollution Research International·Carmen VargasAna Moliner
Apr 19, 2015·Journal of Environmental Radioactivity·Fawwaz Khalili, Ghadeer Al-Banna
Sep 30, 2015·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Xiaofeng GaoYoucai Zhao
Feb 20, 2019·Environmental Science and Pollution Research International·Ling ZhaoYuan-Hua Dong
Sep 25, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Wenlin ZhaoFeng Jiang

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