Unraveling the mechanisms of methylene blue adsorption onto biochar: a robust and sustainable approach for water remediation

IF 3 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Environmental Science and Technology Pub Date : 2024-10-16 DOI:10.1007/s13762-024-06111-8

B. Vafakish, A. Babaei-Ghazvini, B. Acharya

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Abstract

Biochar has emerged as a cost-effective adsorbent for the removal of diverse pollutants. In this investigation, six different biochar variants were derived from oat hull and pea hull, generated at varying pyrolysis temperatures spanning 500°C–700°C. Different methods were employed to characterize these biochars, which were subsequently utilized as adsorbents for the removal of methylene blue (MB) from aqueous solutions. The adsorption performance of the biochar samples is closely linked to the temperature at which pyrolysis was conducted. Significantly, biochar produced at higher temperatures demonstrates markedly enhanced adsorption capabilities compared to those from lower temperatures, with a surface area exceeding 250 m²/g. Adsorption data is best fitted with Sips isotherm Notably, oat hull biochar exhibits a higher maximum adsorption capacity than pea hull biochar, with capacities of 183.4 mg/g and 145.5 mg/g, respectively, and removal efficiencies of 97% and 91%. An exploration of the adsorption mechanism reveals that MB adsorption is influenced not solely by Lewis’s acid–base interactions but also by π–π interactions entailing the biochar’s surface. The adsorption of methylene blue by biochar offers a sustainable and cost-effective solution for wastewater treatment, contributing to environmental remediation and resource utilization.

Graphical abstract

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揭示亚甲基蓝吸附到生物炭上的机制：一种稳健和可持续的水修复方法

生物炭已成为一种具有成本效益的吸附剂，用于去除各种污染物。在这项研究中，从燕麦壳和豌豆壳中提取了6种不同的生物炭变体，在500°C - 700°C的不同热解温度下生成。采用不同的方法对这些生物炭进行表征，随后将其用作吸附剂从水溶液中去除亚甲基蓝（MB）。生物炭样品的吸附性能与热解温度密切相关。值得注意的是，与较低温度下生产的生物炭相比，高温下生产的生物炭具有明显增强的吸附能力，其表面积超过250 m2/g。其中，燕麦壳生物炭的最大吸附量为183.4 mg/g，豌豆壳生物炭的最大吸附量为145.5 mg/g，去除率分别为97%和91%。对吸附机理的探索表明，MB的吸附不仅受Lewis酸碱相互作用的影响，还受生物炭表面π -π相互作用的影响。生物炭吸附亚甲基蓝为污水处理提供了一种可持续、经济的解决方案，有助于环境修复和资源利用。图形抽象

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来源期刊

International Journal of Environmental Science and Technology 环境科学-环境科学

CiteScore

5.60

自引率

6.50%

发文量

806

审稿时长

10.8 months

期刊介绍： International Journal of Environmental Science and Technology (IJEST) is an international scholarly refereed research journal which aims to promote the theory and practice of environmental science and technology, innovation, engineering and management. A broad outline of the journal''s scope includes: peer reviewed original research articles, case and technical reports, reviews and analyses papers, short communications and notes to the editor, in interdisciplinary information on the practice and status of research in environmental science and technology, both natural and man made. The main aspects of research areas include, but are not exclusive to; environmental chemistry and biology, environments pollution control and abatement technology, transport and fate of pollutants in the environment, concentrations and dispersion of wastes in air, water, and soil, point and non-point sources pollution, heavy metals and organic compounds in the environment, atmospheric pollutants and trace gases, solid and hazardous waste management; soil biodegradation and bioremediation of contaminated sites; environmental impact assessment, industrial ecology, ecological and human risk assessment; improved energy management and auditing efficiency and environmental standards and criteria.