Phosphate removal by Lanthanum-doped aminated graphene oxide@aminated chitosan microspheres: Insights into the adsorption mechanism

吸附 磷酸盐 Zeta电位 朗缪尔吸附模型 化学工程 壳聚糖 氧化物 石墨烯 化学 废水 材料科学 核化学 无机化学 纳米技术 有机化学 环境工程 纳米颗粒 工程类
作者
Abdelazeem S. Eltaweil,Karim Ibrahim,Eman M. Abd El-Monaem,Gehan M. El‐Subruiti,Ahmed M. Omer
出处
期刊:Journal of Cleaner Production [Elsevier BV]
卷期号:385: 135640-135640 被引量:88
标识
DOI:10.1016/j.jclepro.2022.135640
摘要

The proliferation of noxious anions particularly phosphate into water bodies depreciates the ecological system and adversely affects human health and the environment. The development of efficient, cleaner and sustainable adsorbents for removing phosphate has become crucial. Herein, new eco-friendly, cleaner and reusable Lanthanum-doped aminated graphene oxide/aminated chitosan microspheres (La-AmGO@AmCs) were fabricated for the efficient removal of phosphate anions. La-AmGO@AmCs microspheres were thoroughly characterized by FTIR, TGA, XRD, SEM, BET, XPS, and zeta potential analysis tools. La-AmGO@AmCs microspheres displayed a positively charged surface (64.4 mV), acceptable thermal stability, and high specific surface area (123.66 m2/g). A promising adsorption performance was attained by increasing the La ratio from 3 to 10% with a trivial increase in the adsorption capacity of phosphate beyond 10% La ratio. The adsorption data were analyzed, revealing the suitability of pseudo-second-order and Langmuir isotherm model with a maximum adsorption capacity of 125 mg/g. Interestingly, La-AmGO@AmCs microspheres exhibited an excellent removal efficiency (>86%) after reusing them for five sequential cycles. The adsorption mechanism of phosphate onto La-AmGO@AmCs took place via electrostatic interactions, inner-sphere complexation, Lewis acid-base interaction, ion exchange, protonation, precipitation, and H- bonding. In conclusion, the experimental results inferred the conceivable applicability of the sustainable La-AmGO@AmCs microspheres for the phosphate removal and recovery from wastewater.
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