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| Effects of PE-microplastics on ammonia nitrogen adsorption by bentonite in water and its mechanism |
| Received:June 03, 2025 |
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| KeyWord:bentonite;microplastics;NH4+;adsorption |
| Author Name | Affiliation | E-mail | | LIU Jiale | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | Ruziguli Abudurehemu | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | SUN Xiaoyang | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | JIA Hongtao | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi 830052, China | | | YANG Zailei | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi 830052, China | | | ZHOU Jianqin | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi 830052, China | | | Meihaguli Ainiwaer | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi 830052, China | Meiha-AN@xjau.edu.cn |
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| Abstract: |
| To clarify the effects of polyethylene(PE)microplastics on bentonite adsorption of ammonia nitrogen(NH4+), sequential batch adsorption experiments were conducted using both single-component and composite systems. Combined with modern spectroscopic analysis methods, the adsorption of NH4+ by bentonite, microplastics, and bentonite+microplastics systems, along with their underlying mechanisms, were investigated. Results indicate: Bentonite exhibits a saturated adsorption capacity of 3.52 mg·g-1 for NH4+. Its adsorption isotherm follows the Freundlich model, indicating multilayer adsorption. NH4+ adsorption capacity increases initially then decreases with rising pH. Ca2+ and Mg2+ ions compete with NH4+ for adsorption sites, reducing bentonite's NH4+ adsorption capacity. Adding microplastics decreases bentonite's NH4+ adsorption. FTIR and SEM analyses indicate that microplastics covering bentonite surfaces reduce NH4+ adsorption sites. In summary, microplastics inhibit bentonite's NH4+ adsorption. |
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