Dynamic Adsorption of Sulfamethoxazole from Aqueous Solution by Lignite Activated Coke

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.

Ultrafast reproducible synthesis of a Ag-nanocluster@MOF composite and its superior visible-photocatalytic activity in batch and in continuous flow

“…However, a direct comparison with other MOFcontinuous flow systems is impossible since all the studies reported so far are exclusively based on sorption processes (mainly vapor phase) and not catalytic ones. In an attempt to position our results within the context of EOCs elimination from water, a comparison can be made with the kinetic constants obtained using MOFs or other adsorbent materials (i.e., the adsorption of diazinon using MIL-100(Cr): KTh = 5.11 -8.33 mL•min -1 •mg -1 , 61 sulfamethazole with lignite activated coke: KTh = 0.04 -0.01 mL•mg -1 •min -1 , 68 or atenolol with activated carbon: KTh = 2.28 mL•mg -1 •min -1 ). 69 Finally, although this laboratory scale MOF photoreactor is still far from its application in wastewater treatments, our work presents the very first example of continuous-flow photodegradation of EOCs using MOFs with a considerably good breakthrough time and working under operation conditions on the range of those normally applied in wastewater treatment plants.…”

Comments on “Dynamic Adsorption of Sulfamethoxazole from Aqueous Solution by Lignite Activated Coke”

“…Hence, it is not logical to compare the three models and say that one is better than the other since all three are mathematically equivalent. In that sense, the model comparison analysis presented by Li et al [ 1 ] in their paper has flaws, and their conclusions are not meaningful.…”

“…The recent paper titled “Dynamic Adsorption of Sulfamethoxazole from Aqueous Solution by Lignite Activated Coke” published by Li et al [ 1 ] in this journal describes dynamic column adsorption experiments to remove sulfamethoxazole (SMX) using lignite activated carbon. This paper is novel and has useful information in advancing the use of adsorption technology in the removal of emerging pollutants from wastewaters.…”

Enhanced Nitrate Nitrogen Removal from Wastewater Using Modified Reed Straw: Adsorption Performance and Resource Utilization

“…where τ (min) is the time required for the effluent concentration to be 50% of the influent concentration; C 0 (mg/L) is the nitrate nitrogen concentration in the influent; C t (mg/L) is the nitrate nitrogen concentration in the effluent at time t; t (min) is the running time; and K YN (min −1 ) is the constant of the Yoon-Nelson model [26].…”