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A green biochar/iron oxide composite for methylene blue removal

Zhang, Ping ; O’Connor, David ; Wang, Yinan ; Jiang, Lin ; Xia, Tianxiang ; Wang, Liuwei ; Tsang, Daniel C.W. ; Ok, Yong Sik ; Hou, Deyi

Journal of hazardous materials, 2020-02, Vol.384, p.121286, Article 121286 [Periódico revisado por pares]

Netherlands: Elsevier B.V

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  • Título:
    A green biochar/iron oxide composite for methylene blue removal
  • Autor: Zhang, Ping ; O’Connor, David ; Wang, Yinan ; Jiang, Lin ; Xia, Tianxiang ; Wang, Liuwei ; Tsang, Daniel C.W. ; Ok, Yong Sik ; Hou, Deyi
  • Assuntos: Adsorption ; Charcoal - chemistry ; Dye adsorption ; Engineered biochar ; Fruit - chemistry ; Green Chemistry Technology - methods ; Green synthesis ; Iron - chemistry ; Methylene blue ; Methylene Blue - chemistry ; Methylene Blue - isolation & purification ; Modified biochar ; Musa - chemistry ; Oxides - chemistry
  • É parte de: Journal of hazardous materials, 2020-02, Vol.384, p.121286, Article 121286
  • Descrição: [Display omitted] •Biochar/iron oxide composite can be successfully produced by green synthesis.•FT-IR, XPS and EDS analysis revealed successful surface modification.•The modified adsorbent exhibited enhanced adsorption capability for methylene blue.•The adsorption fits with the Langmuir isotherm and pseudo second-order kinetics.•The adsorbent performed well under successive adsorption cycling. Adsorbents that effectively remove dye substances from industrial effluents are needed for the protection of human health and the natural environment. However, adsorbent manufacture is associated with secondary environmental impacts. In this study, a green biochar/iron oxide composite was produced using a facile approach involving banana peel extract and FeSO4. The modified biochar’s capacity to adsorb methylene blue (MB) was considerably enhanced (Langmuir Qmax of 862 mg/g for MB when C0 = 500 mg/L, pH = 6.1, T =313 K) compared to the unmodified banana peel biochar, and exhibited good performance for a wide range of pH values (pH 2.05–9.21). The Langmuir isotherm model and pseudo second-order kinetic model accurately describe the adsorption process. The material properties and corresponding adsorption mechanisms were investigated by various experimental techniques. Enhanced MB adsorption by the biochar/iron oxide composite is attributed to increased electronic attraction to MB molecules, as evidenced by XPS analysis. High adsorption capacity was retained after 5 regeneration cycles. This study suggests that biochar can be modified by a green synthesis approach to produce biochar/iron oxide composite with good MB removal capacity.
  • Editor: Netherlands: Elsevier B.V
  • Idioma: Inglês
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