Effect of High Temperature Roasting on Methylene Blue Adsorption of Serpentine Tailings
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摘要:
富镁硅酸盐矿物蛇纹石具有比表面积大、天然卷曲结构、孔道结构丰富等特点，可作为优良的吸附材料。为实现蛇纹石资源的综合利用，通过高温焙烧方法对蛇纹石尾矿进行了改性研究，考察了焙烧蛇纹石尾矿对水相中亚甲基蓝的吸附性能。研究结果表明，与原矿相比，焙烧后的蛇纹石尾矿对亚甲基蓝具有较好的吸附效果，饱和吸附量约为11.27 mg/g；随着尾矿用量和吸附时间的增加，亚甲基蓝的吸附率也随之增加，且在中性和碱性条件下达到最好的吸附效果。焙烧后的蛇纹石尾矿对亚甲基蓝的吸附过程符合准二级动力学模型和Langmuir吸附等温线模型，吸附类型属于化学吸附，吸附方式为单分子层吸附。以上研究表明，高温焙烧利于蛇纹石尾矿对亚甲基蓝的吸附，可促进蛇纹石尾矿的综合利用。
Abstract:Serpentine is a magnesium-rich silicate mineral with large specific surface area, natural convoluted and rich pore structure, which can be used as an excellent adsorption material. In order to realize the comprehensive utilization of serpentine resources, serpentine tailings roasted by high temperature was used as an adsorbent on Methylene blue in aqueous. The results indicated that, compared with the original ore, the roasted serpentine tailings had a better adsorption effect on Methylene blue, with a saturation adsorption capacity of about 11.27 mg/g. The adsorption rate of Methylene blue increased with the increase of tailings dosage and adsorption time, and the best adsorption effect was achieved under neutral and alkaline conditions. The adsorption process of Methylene blue by roasted serpentine tailings was in accordance with the pseudo second order kinetic model and Langmuir adsorption isotherm model, and the adsorption process belongs to monolayer chemisorption. Based on the above study, high temperature roasting facilitates the adsorption of Methylene blue on serpentine tailings, which can promote the comprehensive utilization of serpentine tailings.
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Key words:
- serpentine tailings /
- high temperature modification /
- adsorption /
- methylene blue /
- adsorption kinetics
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表 1 吸附动力学模型拟合估算结果
Table 1. Fitting estimation results of adsorption kinetics model
一级动力学模型 二级动力学模型 Qe, cal/(mg·g-1) K1/min-1 R2 Qe, cal/(mg·g-1) K2/(g·mg-1·min-1) R2 10.59 0.000 187 0.988 77 0.925 9 0.439 2 0.998 45 
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表 2 吸附等温线模型估算结果
Table 2. Estimation results of adsorption isotherm model
Langmuir Freundlich Qm/(mg·g-1) KL/(L·mg-1) R2 KF/(mol·(L(1-1/n)·g)-1) 1/n R2 20.74 0.0049 0.97297 0.27399 0.66342 0.94709
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