Column adsorption of Cu(Ⅱ) by polymer-supported nano-iron oxides in the presence of sulfate:Experimental and mathematical modeling

doi:10.1016/j.cjche.2017.01.011

Abstract

Abstract: Polymer-supported hydrous iron oxides (HFOs) are promising for heavy metals removal from aqueous systems. The ubiquitous inorganic ligands, e.g., sulfate, are expected to exert considerable impacts on pollutants removal by these hybrid sorbents. Herein, we obtained a hybrid sorbent HFO-PS by encapsulating nanosized HFO into macroporous polystyrene (PS) resin. Both batch and column sorption experiments of Cu(Ⅱ) by HFO-PS were carried out in the presence of sulfate. Obviously, the presence of sulfate is favorable for Cu(Ⅱ) sorption onto HFO-PS. The performances of column Cu(Ⅱ) removal were fitted and predicted with Adams-Bohart, Clark, Thomas and BDST models. Thomas model is suggested best-fit to predict the breakthrough curves. Besides, a linear correlation is observed between breakthrough time and column length based on BDST model, which might be useful for predicting the breakthrough time for Cu(Ⅱ) removal by HFO-PS.

Key words: Composite, Nanotechnology, Waste water, Hydrous iron oxide, Fixed-bed adsorption, Thomas model

摘要： Polymer-supported hydrous iron oxides (HFOs) are promising for heavy metals removal from aqueous systems. The ubiquitous inorganic ligands, e.g., sulfate, are expected to exert considerable impacts on pollutants removal by these hybrid sorbents. Herein, we obtained a hybrid sorbent HFO-PS by encapsulating nanosized HFO into macroporous polystyrene (PS) resin. Both batch and column sorption experiments of Cu(Ⅱ) by HFO-PS were carried out in the presence of sulfate. Obviously, the presence of sulfate is favorable for Cu(Ⅱ) sorption onto HFO-PS. The performances of column Cu(Ⅱ) removal were fitted and predicted with Adams-Bohart, Clark, Thomas and BDST models. Thomas model is suggested best-fit to predict the breakthrough curves. Besides, a linear correlation is observed between breakthrough time and column length based on BDST model, which might be useful for predicting the breakthrough time for Cu(Ⅱ) removal by HFO-PS.

关键词: Composite, Nanotechnology, Waste water, Hydrous iron oxide, Fixed-bed adsorption, Thomas model

Hui Qiu, Xiaolin Zhang, Zhe Xu. Column adsorption of Cu(Ⅱ) by polymer-supported nano-iron oxides in the presence of sulfate:Experimental and mathematical modeling[J]. , 2017, 25(9): 1163-1169.

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