LIUJue,YANGXiao,CAOZhen,et al.Quaternary Ammonium?modified Hydrophobic Powdered Activated Carbon for Enhanced Perchlorate Removal and Its Mechanism[J].China Water & Wastewater,2025,41(17):69-75.
Quaternary Ammonium?modified Hydrophobic Powdered Activated Carbon for Enhanced Perchlorate Removal and Its Mechanism
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第17期
Page:
69-75
Column:
Date of publication:
2025-09-01
- Keywords:
- perchlorate; powdered activated carbon; electrostatic adsorption; hydrophobicity; water treatment plant
- Abstract:
- The development of efficient removal technologies for perchlorate in drinking water is an important research direction in the field of water treatment. Two commercial powdered activated carbons (PAC1 and PAC2) were characterised with respect to Zeta potential, specific surface area and pore size distribution, and it was found that PAC2 with positive surface charge (0.181 mV), larger specific surface area (937.56 m2/g), larger pore volume (0.512 cm3/g) and smaller pore size (5.87 nm) showed excellent perchlorate adsorption performance in pure water, with an adsorption capacity of 18.5 mg/g, which was much higher than that of PAC1 of 2.49 mg/g. On the basis of PAC2, PAC2-CTAB was prepared by using the modification of cetyltrimethylammonium bromide. The long alkyl chain and quaternary ammonium group improved the hydrophobicity and positive surface charge of the material, the perchlorate partition coefficient was increased to 10.07 L/mg, and the removal rate of perchlorate in raw water was increased by 5.5 times compared with that of PAC2, reaching 55.03%. According to the 10 m3/h pilot test, when the perchlorate concentration was lower than 100 μg/L, the effluent could reach the standard through the emergency dosing of 40 mg/L PAC2-CTAB. The research results provide a theoretical basis and engineering practical solution for water treatment plants to cope with the problem of perchlorate exceeding the standard in raw water.
Last Update:
2025-09-01