A Quaternary Ammonium-Modified Resin for Selective Perchlorate Removal from Fireworks Wastewater

Area of Science:

• Environmental Chemistry
• Materials Science
• Water Treatment Technologies

Background:

• Perchlorate (ClO4-) presents a significant environmental challenge due to its high solubility and stability, making conventional water treatment methods ineffective.
• Quaternary ammonium resins are promising for ClO4- removal, necessitating the development of advanced, high-performance materials.

Purpose of the Study:

• To synthesize and characterize a novel quaternary ammonium resin (PS-QA) for enhanced perchlorate removal.
• To evaluate the adsorption performance, kinetics, and stability of PS-QA compared to commercial resins.

Main Methods:

• Synthesis of PS-QA resin via amination of poly(vinylbenzyl chloride) with N,N-dimethylethanolamine.
• Characterization of resin properties including surface area, pore size, and thermal stability.
• Adsorption studies using isotherm and kinetic analyses in various water matrices.

Main Results:

• PS-QA demonstrated comparable adsorption performance, specific surface area, and pore characteristics to commercial resins.
• Adsorption equilibrium was achieved within 60 minutes, following the Freundlich model, indicating a chemisorption mechanism.
• The resin exhibited excellent reusability (over 80% activity after 3 cycles) and resistance to interfering ions in complex water.

Conclusions:

• The novel PS-QA resin is a highly effective and reusable material for perchlorate remediation.
• PS-QA shows significant potential for practical applications in treating perchlorate-contaminated water, including pilot-scale success.