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.

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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.