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The Systematic Adsorption of Diclofenac onto Waste Red Bricks Functionalized with Iron Oxides

1
Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
2
Beijing Urban Green Source Environmental Protection Technology Cooperation, Beijing 102601, China
3
CRRC Environmental Science & Technology Cooperation, Beijing 100067, China
*
Author to whom correspondence should be addressed.
Water 2018, 10(10), 1343; https://doi.org/10.3390/w10101343
Received: 17 August 2018 / Revised: 24 September 2018 / Accepted: 24 September 2018 / Published: 28 September 2018
(This article belongs to the Section Water and Wastewater Treatment)
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PDF [3857 KB, uploaded 28 September 2018]
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Abstract

In this study, waste red bricks were incorporated with iron oxides (goethite and hematite) and used for the removal of diclofenac (DCF) from aqueous solutions. The prepared waste red bricks were systematically characterized by XRF, XRD, BET, and SEM. The batch experiments were systematically conducted by investigating the adsorption kinetics, isotherms, thermodynamics, pH, and ionic strength effect. Results showed that the incorporation of iron oxides could enhance the adsorption capacity of DCF onto waste bricks, while the increased effect of hematite was better than goethite. DCF was adsorbed rapidly onto waste bricks, and the adsorption kinetic fitted the pseudo-second-order model perfectly, which could be attributed to the strong interaction between DCF and iron oxides. The increasing pH values decreased the adsorption capacity greatly, which may be due to the electrostatic repulsive interactions. The adsorption of DCF onto waste bricks was an exothermic reaction, and the adsorption isotherms fitted well with the Langmuir model. This study offers new guidelines for the utilization of construction waste, and shows useful methods for the elimination of micropollutants from aqueous solution. View Full-Text
Keywords: waste bricks; goethite; hematite; adsorption; diclofenac waste bricks; goethite; hematite; adsorption; diclofenac
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Zhang, Z.; Li, Y.; Chen, H.; Zhang, X.; Li, H. The Systematic Adsorption of Diclofenac onto Waste Red Bricks Functionalized with Iron Oxides. Water 2018, 10, 1343.

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