The preparation of bentonite–zeolite (BZ) adsorbent using bentonite, aluminate, and rice husk was conducted. The adsorption experiment was performed for the removal of Cu2+ and Zn2+ from aqueous solution in single and binary systems. Results showed that gasification of rice husk could effectively improve the specific surface area and pore volume. The optimum pH for Cu2+ and Zn2+ adsorption on BZ was pH 5.0. The pseudo-first order kinetic and Langmuir isotherm model of BZ were the optimal model for Cu2+ and Zn2+. According to Langmuir isotherm model, the maximum adsorption capacity value (qm) was 16.39 and 12.72 mg·g−1 for Cu2+ and Zn2+, respectively. The adsorption affinity order of BZ in the binary solution was Cu2+ > Zn2+. NH4+-N concentration over 500 mg·L−1 significantly affected the adsorption capacity of BZ (P < 0.05). The adsorption capacity of BZ for Cu2+ and Zn2+ was higher than that artificial zeolite (AZ) and bentonite in SW.
Bibliographical noteFunding Information:
This research was supported by the Research Project of State Key Laboratory of Food Science and Technology Nanchang University (Project No. SKLF-ZZB-201722 ); Key project of Jiangxi Provincial Department of Science and Technology Jiangxi ( 20161BBF60057 ); The National Natural Science Foundation of China ( 21466022 , 21878139 ); Special fund for Jiangxi Province ( GCXZ2014-124 100102102082 ) for Financial Support; The National study abroad Fund.
- Adsorption model
- Heavy metal
- Swine wastewater