Journal Article

The investigation of sorption–desorption performance and mechanism of copper by surfactant-modified zeolite in aqueous solutions

Tan, Chaohong, Chen, Hongrui, Gao, Chenyu, Li, Haiyan, Zhang, Ziyang, Zhang, Xiaoran, Zhang, Yanfei, Gong, Yongwei, Bai, Xiaojuan

2024

Overview

As the most common filler in stormwater treatment, zeolite (NZ-Y) has good cation exchange capability and stabilization potential for the removal of heavy metal from aqueous solutions. In this study, sodium dodecyl sulfate (SDS) and NZ-Y were selected to preparing new adsorbent (SDS-NZ) by using a simple hydrothermal method. The sorption–desorption performance and mechanism of Cu(II) onto SDS-NZ were investigated. The results showed that the sorption of Cu(II) on SDS-NZ was in accordance with the pseudo-second-order kinetic model with an equilibrium time of 4 h. The sorption behavior fitted Langmuir isotherm with a saturation sorption capability of 9.03 mg/g, which was three times higher than that of NZ-Y. The modification of SDS increases the average pore size of NZ-Y by 3.96 nm, which results in a richer internal pore structure and more useful sorption sites for Cu(II) sorption. There was a positive correlation between solution pH values and sorption capability of Cu(II) in the range of 3.0–6.0. With the ionic strength increased, the sorption capability of Cu(II) onto SDS-NZ first decreased and then increased, which may be attributed to competitive sorption and compression of the electronic layer. The desorption of Cu(II) on SDS-NZ was favored by the increase in SDS concentration and ionic strength and decrease in solution pH values. The application of SDS-NZ in runoff improved the leaching risk of Cu(II). After several cycles, the ability of reused SDS-NZ to efficiently adsorb most heavy metals was verified with removal rates above 99%. Graphical abstract

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: adsorbents / Aquatic Pollution / Aqueous solutions / Cation exchange / Cation exchanging / Copper / Desorption / Earth and Environmental Science / Ecotoxicology / Environment / Environmental Chemistry / Environmental Health / Heavy metals / hot water treatment / Ionic strength / kinetics / Leaching / Pore size / porosity / Research Article / risk / runoff / Sodium dodecyl sulfate / Sodium lauryl sulfate / Sorption / sorption isotherms / Stormwater / stormwater management / Waste Water Technology / Water Management / Water Pollution Control / Zeolites