Crayfish shell biochar for methyl violet adsorption: Equilibrium and kinetic studies

Next Sustainability Pub Date : 2025-01-01 DOI:10.1016/j.nxsust.2024.100093

Azrul Nurfaiz Mohd Faizal , Chew Hui Wen , Nicky Rahmana Putra , Ahmad Syahmi Zaini , Augustine Agi , Abu Hassan Nordin , Muhammad Abbas Ahmad Zaini

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Abstract

This work was aimed to establish the equilibrium and kinetics of methyl violet removal onto crayfish shell biochars. The biochars were prepared through pyrolysis at 500, 650 and 800

℃

for 1.5 h. The biochars were labelled as CS500, CS650 and CS800, respectively. All biochars are highly mesoporous with CS650 exhibits a higher surface area of 665 m²/g. The adsorption results are tied up with the physiochemical properties of biochars. The CS800 displays the maximum dye capacity at 1079 mg/g. The performance of biochars is given in the order of, CS800 > CS650 > CS500. The equilibrium of methyl violet adsorption was best described by modified Langmuir isotherm, while the kinetic data obeyed pseudo-second-order model. The removal of methyl violet is governed partly by precipitation onto crayfish shell biochars. To conclude, the crayfish shell is a potential feedstock of biochar for dye wastewater treatment.

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螯虾壳生物炭吸附甲基紫的平衡与动力学研究

本工作旨在建立甲基紫在螯虾壳生物炭上的去除平衡和动力学。分别在500、650、800℃条件下热解1.5 h制备生物炭。生物炭分别标记为CS500、CS650和CS800。所有生物炭均为高介孔生物炭，其中CS650的比表面积更高，为665 m2/g。吸附结果与生物炭的理化性质密切相关。CS800显示最大染料容量为1079 mg/g。生物炭的性能排序为：CS800 >； CS650 > CS500。用修正的Langmuir等温线可以很好地描述甲基紫的吸附平衡，而动力学数据服从伪二阶模型。甲基紫的去除部分取决于沉淀到小龙虾壳生物炭上。综上所述，小龙虾壳是一种很有潜力的处理染料废水的生物炭原料。

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