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Article

Effect of Functional Group Density of Anion Exchange Resins on Removal of p-Toluene Sulfonic Acid from Aqueous Solution

1
Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 211189, China
2
Nanjing University & Yancheng Academy of Environmental Protection Technology and Engineering, Yancheng 224051, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(1), 1; https://doi.org/10.3390/app10010001
Received: 11 November 2019 / Revised: 10 December 2019 / Accepted: 14 December 2019 / Published: 18 December 2019
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. View Full-Text
Keywords: functional group density; p-toluene sulfonic acid; anion exchange resin; selectivity functional group density; p-toluene sulfonic acid; anion exchange resin; selectivity
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MDPI and ACS Style

Sun, Y.; Li, X.; Zheng, W.; Ding, X.; Singh, R.P. Effect of Functional Group Density of Anion Exchange Resins on Removal of p-Toluene Sulfonic Acid from Aqueous Solution. Appl. Sci. 2020, 10, 1. https://doi.org/10.3390/app10010001

AMA Style

Sun Y, Li X, Zheng W, Ding X, Singh RP. Effect of Functional Group Density of Anion Exchange Resins on Removal of p-Toluene Sulfonic Acid from Aqueous Solution. Applied Sciences. 2020; 10(1):1. https://doi.org/10.3390/app10010001

Chicago/Turabian Style

Sun, Yue, Xiao Li, Weisheng Zheng, Xinchun Ding, and Rajendra Prasad Singh. 2020. "Effect of Functional Group Density of Anion Exchange Resins on Removal of p-Toluene Sulfonic Acid from Aqueous Solution" Applied Sciences 10, no. 1: 1. https://doi.org/10.3390/app10010001

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