磁性微藻生物炭去除单金属和多金属溶液中的重金属

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2024-11-22 DOI:10.1016/j.jwpe.2024.106622

Xiaosong Tian , Shiyu Chu , Yujie Hu , Longzao Luo , Xiaoai Lin , Hui Wang

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引用次数: 0

摘要

磁性微藻生物炭（MMBC）是一种极具吸引力的吸附材料，可用于去除废水中的重金属（HMs）。本研究探讨了利用从养猪场沼渣中培养的微藻生物质制备的 MMBC 去除单一和多种 HMs 的问题。结果表明，在 200 ℃ 条件下，藻粉与 K2FeO4 的混合比为 1:4（MMBC2001:4）制备的 MMBC 对 HMs 具有出色的吸附能力。五种 HMs 的吸附能力随 pH 值≤5.0 而增加，超过 5.0 后，每种 HMs 都相继出现沉淀现象。在多金属溶液中，由于 HMs 之间的竞争性相互作用，每种 HMs 的吸附能力都低于单金属溶液。不过，混合 HM 的总体吸附容量并未受到明显影响。单金属的吸附动力学遵循伪一阶，多金属的吸附动力学遵循伪二阶。五种 HMs 的吸附等温线分别遵循 Langmuir 和 Freundlich 模型。吸附的 MMBC 具有磁性，易于分离和再生。MMBC 吸附 HMs 的主要机制包括物理吸附、与氧官能团络合以及阳离子-π 相互作用。这项研究强调了微藻生物炭去除废水中 HMs 的有效性。

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Removal of heavy metals from single- and multi-metal solution by magnetic microalgae-derived biochar

Magnetic microalgae-derived biochar (MMBC) is an attractive adsorbent material for the removal of heavy metals (HMs) from wastewater. This study explored removal of single and multiple HMs by MMBC derived from microalgae biomass cultivated in piggery digestate. Results showed that the MMBC prepared with algae powder to K₂FeO₄ mixing ratio of 1:4 at 200 °C (MMBC200_1:4) exhibited excellent adsorption capabilities for HMs. The adsorption capacity of the five HMs increased with pH ≤ 5.0, beyond which precipitation phenomena occurred successively for each HM. In a multi-metal solution, the adsorption capacity for each HM was lower compared to single-metal solutions due to competitive interactions among the HMs. However, the overall adsorption capacity for the mixture of HMs was not significantly affected. The adsorption kinetics followed pseudo-first-order for single metals and pseudo-second-order for multi-metals. The adsorption isotherms of the five HMs followed the Langmuir and Freundlich models, respectively. The magnetic properties of the adsorbed MMBC facilitate easy separation and regeneration. The main mechanisms for the adsorption of HMs by MMBC include physical adsorption, complexation with oxygen functional groups, and cation–π interactions. This research highlights the effectiveness of microalgal biochar in removing HMs from wastewater.

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies