Abstract
In this paper, lignite activated coke was used as adsorbent for dynamic column adsorption experiments to remove sulfamethoxazole from aqueous solution. The effects of column height, flow rate, initial concentration, pH and humic acids concentration on the dynamic adsorption penetration curve and mass transfer zone length were investigated. Results showed penetration time would be prolonged significantly by increasing column height, while inhibited by the increasement of initial concentration and flow rate. Thomas and Yoon-Nelson model and the Adams-Bohart model were used to elucidate the adsorption mechanism, high coefficients of R2 > 0.95 were obtained in Thomas model for most of the adsorption entries, which revealed that the adsorption rate could probably be dominated by mass transfer at the interface. The average change rates of mass transfer zone length to the changes of each parameters, such as initial concentration, the column height, the flow rate and pH, were 0.0003, 0.6474, 0.0076, 0.0073 and 0.0191 respectively, revealed that column height may play a vital role in dynamic column adsorption efficiency. These findings suggested that lignite activated coke can effectively remove sulfamethoxazole contaminants from wastewater in practice.
Highlights
Pharmaceuticals and personal care products (PPCPs) have become emerging pollutants due to the large amount of human consumption and usage [1,2,3,4]
Dynamic column adsorption of sulfamethoxazole by lignite activated coke from aqueous solution were conducted under different initial sulfamethoxazole concentrations, flow rates, column height and pH to investigate the optimized adsorption conditions for wastewater treatment
Results demonstrated that activated coke has high adsorption efficiency for sulfamethoxazole removal from aqueous solution
Summary
Pharmaceuticals and personal care products (PPCPs) have become emerging pollutants due to the large amount of human consumption and usage [1,2,3,4]. Relating to the properties of high polarity and low volatility, PPCPs tend to be distributed and migrated to the environment through water phase transfer and food chain diffusions [5,6]. Many PPCPs pollutants have been detected in surface water, groundwater, drinking water and sewage, in the level of ng/L to μg/L, which will have potentially toxicological effects on the aquatic organisms [6]. The accumulation of these chemicals through the food chain may be harmful to human health [7]. It is necessary to develop effective treatment options to reduce their release into the environment. Various methods to remove PPCPs from wastewater have been developed, including photocatalysis [8,9], advanced oxidation [10,11], electrocatalysis [12,13], adsorption [14,15] and so on
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