Abstract
Adsorption using anion exchange resins is an efficient method for the removal of aromatic sulfonic acids (ASAs) from industrial wastewater. In this study, a series of weak-base anion exchangers (SD1–SD5) were synthesized to investigate the effect of functional group density of resins on the adsorption of ASAs from wastewater containing competitive inorganic anions. p-Toluene sulfonic acid (PTSA) was selected as a target pollutant, and Na2SO4 was chosen as the competitive inorganic salt because of its widespread existence in industrial wastewater. Adsorption performances of these resins were evaluated and compared in terms of selectivity, kinetics, isotherms, regeneration, and dynamic adsorption behavior. Importantly, the PTSA uptake increased with the raising content of functional groups on resins in the absence of Na2SO4; however, in the presence of a high level of Na2SO4 (for example, ≥1%), a decrease in the functional group density could improve the adsorption capacity of resins for PTSA. Moreover, desorption and fixed bed column experiments were conducted in all resins, thereby confirming the effect of functional group density of resins on the PTSA adsorption in actual application. In brief, this research will provide a better understanding for the design and preparation of anion exchangers for the effective removal of ASA from wastewater.
Highlights
Water contamination by industrial organic effluent has attracted incessant attention all over the world
p-Toluene sulfonic acid (PTSA) was purchased from Aldrich Sigma (Shanghai, China)
The BET surface area and pore volume decreased with the increase of functional group density, which
Summary
Water contamination by industrial organic effluent has attracted incessant attention all over the world. It is crucial to effectively treat the wastewater from the manufacturing and subsequent using process of ASAs. Many techniques have been adapted and proposed to deal with the industrial wastewater containing ASAs, such as advanced oxidation technology [3,4,5], biological treatment [6,7,8], extraction [9,10], and adsorption [2,11,12]. Many techniques have been adapted and proposed to deal with the industrial wastewater containing ASAs, such as advanced oxidation technology [3,4,5], biological treatment [6,7,8], extraction [9,10], and adsorption [2,11,12] Among these methods, adsorption is generally considered an effective process to remove organic pollutants and purify contaminated water due to its simplicity, Appl.
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