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

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 adsorpti...

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Bibliographic Details
Published in:Applied sciences 2020-01, Vol.10 (1), p.1
Main Authors: Sun, Yue, Li, Xiao, Zheng, Weisheng, Ding, Xinchun, Singh, Rajendra Prasad
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Anion exchange
Anion exchanging
Anions
Aqueous solutions
Density
Equilibrium
Experiments
Fixed beds
Fourier transforms
Functional groups
Industrial wastes
Industrial wastewater
Inorganic salts
Pollutants
Pore size
Resins
Selectivity
Sodium sulfate
Spectrum analysis
Sulfonic acid
Toluene
Wastewater
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10010001