Abstract
In this study, to investigate the elimination of micropollutant from aqueous solutions by construction waste, waste red brick (WRB) with and without incorporated of iron species (goethite and hematite) were prepared by a simple method. The prepared materials were systematically characterized and batch experiments were conducted to study the elimination of typical micropollutant cimetidine from the water environment. Results showed that both two iron species could be successfully incorporated onto WRB and the main structure of WRB were maintained. The adsorption process of cimetidine onto bricks was fast due to the microstructure and useful adsorption sites on the surface of bricks. The Langmuir model fitted the experimental data better and the qmax of cimetidine increased about 24.4% and 39.6% for the incorporation of hematite and goethite, respectively. The pH values influenced the adsorption behavior greatly and the favorable pH value was around 6.0. The charge screening effect and competition adsorption may influence the adsorption behavior together. Due to the interaction between cimetidine and bricks, the outer-sphere complexation may be formed in the adsorption process. This study shows new methods for the elimination of the micropollutant from the water environment and offers useful guidelines for the reuse of construction waste.
Highlights
For the past decades, water pollution has got greater attentions due to the growing contaminants from traditional pollutants to emerging contaminants [1]
After the digestion by acid, the results showed that the iron content on the Goethite coated waste res brick (GWRB) and hematite coated waste res brick (HWRB) is higher than that of waste red brick (WRB)
These results suggested that WRB, GWRB, and HWRB could be used as useful adsorbents for the removal of cimetidine from aqueous solutions
Summary
Water pollution has got greater attentions due to the growing contaminants from traditional pollutants to emerging contaminants [1]. As a typical construction waste, waste bricks could cause an adverse effect effect on the environment due to the low utilization rate [15]. Compared with the commercial adsorbents, the lower adsorption adsorption capacity of waste bricks inhibits their application in wastewater treatment [20]. To explore the new adsorbent with low cost and high efficiency for the removal of micropollutants, waste bricks with and without iron species were selected to investigate the removal micropollutants, waste bricks with and without iron species were selected to investigate the removal of typical pharmaceutical-cimetidine from aqueous solutions. The adsorption behavior of kinetics, isotherms, pH, and ionic strength were strength were investigated to study the insight into the adsorption of cimetidine onto waste bricks.
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