Better waste utilization: Mg-modified biochar from wetland plant waste for phosphorus removal and carbon sequestration

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering Pub Date : 2024-09-26 DOI:10.1016/j.jece.2024.114264

Tingting Wang , Xinxi Fu , Yonghua Chen , Jingdong Wu , Yuanyuan Wang , Honghai Wan , Xiangyu Li , Lizhen Zhao

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Abstract

Withered wetland plants have become a treat to water ecological security. To address the issue of waste biomass disposal, a typical wetland plant, Hydrocotyle vulgaris, was utilized to produce Mg-modified biochar (MBC) for efficient phosphorus (P) removal and stable carbon sequestration. The adsorption behavior fit Langmuir isotherm and the pseudo second-order kinetic models, which revealed the nature of monolayer chemical adsorption of MBC. The removal of P was achieved through physical diffusion, Mg²⁺ precipitates, surface complexation and electrostatic attraction. Based on the analysis of thermodynamics models, it can be concluded that the adsorption behavior of P by MBC was spontaneous and endothermic. The MBC exhibited a maximum phosphorus adsorption capacity of 314.048 mg/g. Concurrently, the specific surface area was enhanced from 529.974 m²/g to 931.019 m²/g. The research has also recorded valuable data about the carbon sequestration potential of MBC with the carbon content reaching 0.51 g per g of biochar. It was found from the outcomes that Mg-modified biochar had outstanding carbon sequestration potential and significantly improved P removal efficiency.

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更好地利用废物：从湿地植物废弃物中提取镁改性生物炭，用于除磷和固碳

湿地植物枯死已成为水生态安全的一大隐患。为了解决废弃生物质的处理问题，研究人员利用典型的湿地植物 Hydrocotyle vulgaris 生产镁改性生物炭 (MBC)，以达到高效除磷和稳定固碳的目的。吸附行为符合朗缪尔等温线和伪二阶动力学模型，揭示了 MBC 的单层化学吸附性质。P 的去除是通过物理扩散、Mg2+ 沉淀、表面络合和静电吸引实现的。根据热力学模型的分析，可以得出 MBC 对磷的吸附行为是自发的、内热的。MBC 的最大磷吸附容量为 314.048 mg/g。同时，比表面积从 529.974 m2/g 增加到 931.019 m2/g。研究还记录了有关 MBC 固碳潜力的宝贵数据，其碳含量达到每克生物炭 0.51 克。研究结果表明，镁改性生物炭具有出色的固碳潜力，并显著提高了对磷的去除效率。

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 Environmental Chemical Engineering Environmental Science-Pollution

CiteScore

11.40

自引率

6.50%

发文量

2017

审稿时长

27 days

期刊介绍： The Journal of Environmental Chemical Engineering (JECE) serves as a platform for the dissemination of original and innovative research focusing on the advancement of environmentally-friendly, sustainable technologies. JECE emphasizes the transition towards a carbon-neutral circular economy and a self-sufficient bio-based economy. Topics covered include soil, water, wastewater, and air decontamination; pollution monitoring, prevention, and control; advanced analytics, sensors, impact and risk assessment methodologies in environmental chemical engineering; resource recovery (water, nutrients, materials, energy); industrial ecology; valorization of waste streams; waste management (including e-waste); climate-water-energy-food nexus; novel materials for environmental, chemical, and energy applications; sustainability and environmental safety; water digitalization, water data science, and machine learning; process integration and intensification; recent developments in green chemistry for synthesis, catalysis, and energy; and original research on contaminants of emerging concern, persistent chemicals, and priority substances, including microplastics, nanoplastics, nanomaterials, micropollutants, antimicrobial resistance genes, and emerging pathogens (viruses, bacteria, parasites) of environmental significance.