Sustainable electrocoagulation for lignin valorization: Green synthesis of magnetic mesoporous activated carbon from pulp and paper industry black liquor and its application as an adsorbent for methylene blue

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2024-10-30 DOI:10.1016/j.jwpe.2024.106392

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Abstract

The separation and valorization of lignin from cellulosic biomass are critical yet challenging processes. Conventional methods like LignoBoost and LignoForce are energy-intensive and require high capital costs. In addition, they involve hazardous chemicals such as sulfuric acid, leading to SOx emissions. This study aims to develop a sustainable and environmentally friendly electrocoagulation process (EC) for lignin separation and valorization from black liquor in the pulp and paper industry. The EC achieved a 91 % lignin removal efficiency using iron electrodes, significantly higher than conventional methods. The separated lignin was carbonized to produce magnetic mesoporous activated carbon (MMAC) in a greener manner. The MMAC was systematically characterized using SEM, XRD, Raman, BET, and FTIR techniques, revealing a surface area of 125.37 m²/g and an average pore size of 6.59 nm. MMAC demonstrated high efficiency in adsorbing 91 % of Methylene Blue from dye solution within 30 min and maintained performance over four cycles, demonstrating the potential of EC in producing high-performance MMAC.

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可持续电凝木质素价值化：从制浆造纸工业黑液中绿色合成磁性介孔活性炭并将其用作亚甲基蓝的吸附剂

从纤维素生物质中分离木质素并对其进行价值评估是一项至关重要但又极具挑战性的工艺。LignoBoost 和 LignoForce 等传统方法都是能源密集型的，需要高昂的资本成本。此外，这些方法还涉及硫酸等有害化学物质，导致硫氧化物的排放。本研究旨在开发一种可持续且环保的电凝工艺（EC），用于从制浆造纸行业的黑液中分离木质素并使其增值。利用铁电极，电凝工艺的木质素去除率达到 91%，明显高于传统方法。分离出的木质素被碳化，以更环保的方式生产出磁性介孔活性炭（MMAC）。使用 SEM、XRD、拉曼、BET 和傅立叶变换红外技术对 MMAC 进行了系统表征，结果显示其表面积为 125.37 m2/g，平均孔径为 6.59 nm。MMAC 能在 30 分钟内高效吸附染料溶液中 91% 的亚甲基蓝，并能在四个周期内保持吸附性能，这证明了 EC 在生产高性能 MMAC 方面的潜力。

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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