One-pot hydrothermal preparation of pomegranate peels-derived nitrogen/lanthanum co-doped magnetic hydrochar for efficient phosphate adsorption: Insights into performance and mechanisms

IF 10 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Cleaner Production Pub Date : 2025-01-20 DOI:10.1016/j.jclepro.2024.144620

Hui Zhang , Wanying Tong , Huiyao Li , Chen Li , Mingyao Ma , Zhengliang Dong , Guangshan Zhang , Jianhua Qu , Ying Zhang

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Abstract

Herein, nitrogen/lanthanum co-doped magnetic hydrochar (N/La@MHC) derived from pomegranate peels was synthetized through one-pot hydrothermal carbonization synthesis technology, which was applied to remediate phosphate-contaminated water. Characterization results verified the successful doping of N, La, and Fe and the presence of magnetism on N/La@MHC. N/La@MHC possessed multiple uptake behavior and appeared outstanding phosphate adsorption capacity of 115.84 mg/g with endothermic characteristic. Meanwhile, N/La@MHC with pH-dependency exhibited high tolerance to multiple interfering anions and maintained 85.94% removal efficiency after five regeneration cycles. Notably, N/La@MHC could efficiently remove phosphate owing to the combined actions of chemical adsorption (precipitation and inner-sphere complexation) and physical adsorption (pore filling and electrostatic attraction). Additionally, Fe-Nx and graphitic N on N/La@MHC surface as dominant active sites were responsible for enhancing phosphate uptake. Overall, N/La@MHC with excellent performance was supposed to be the promising adsorbent to remediate wastewater containing phosphate.

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一锅水热法制备石榴皮衍生的氮/镧共掺杂磁性水炭，用于高效吸附磷酸盐：对性能和机理的见解

本文采用一锅水热碳化合成技术，合成了以石榴皮为原料的氮/镧共掺杂磁性氢炭（N/La@MHC），并将其应用于磷酸盐污染水体的修复。表征结果证实了N、La和Fe的成功掺杂以及N/La@MHC上磁性的存在。N/La@MHC具有多重吸附行为，表现出较强的吸热吸附能力，吸附量为115.84 mg/g。同时，具有ph依赖性的N/La@MHC对多种干扰阴离子表现出较高的耐受性，在5次再生循环后仍能保持85.94%的去除率。值得注意的是，由于化学吸附（沉淀和球内络合）和物理吸附（孔隙填充和静电吸引）的共同作用，N/La@MHC可以有效地去除磷酸盐。此外，N/La@MHC表面的Fe-Nx和石墨N作为主要活性位点促进了磷酸盐的吸收。综上所述，性能优异的N/La@MHC被认为是修复含磷废水的理想吸附剂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Cleaner Production 环境科学-工程：环境

CiteScore

20.40

自引率

9.00%

发文量

4720

审稿时长

111 days

期刊介绍： The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.