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采用静态吸附法研究了Ca2+在煤表面的吸附动力学和热力学,用Langmuir和Freundlich方程对吸附等温线进行了拟合,并用Freundlich吸附分形模型计算了不同温度下煤颗粒表面的分形维数.动力学曲线表明Ca2+在煤表面的吸附量先逐步增加,吸附50 min后吸附量趋于平衡;相关热力学函数(ΔG,ΔH,ΔS)计算结果表明煤对Ca2+的吸附是一个熵增吸热过程;Ca2+在煤表面的吸附等温线遵循Langmuir方程和Freundlich方程,但Freundlich方程拟合的线性相关性更好;在温度为298,308和315 K下,运用Freundlich吸附分形模型计算煤颗粒表面的分形维数分别为2.640,2.841和2.879.
Adsorption kinetics and thermodynamics of Ca2 + on coal surface were studied by static adsorption method. The adsorption isotherms were fitted by Langmuir and Freundlich equations, and the fractal dimension of coal particles at different temperatures was calculated by Freundlich adsorption fractal model. The curves of adsorption show that the adsorption capacity of Ca2 + on the coal surface first increases gradually and the adsorption capacity balances after 50 min of adsorption. The calculated thermodynamic functions (ΔG, ΔH, ΔS) show that the adsorption of Ca2 + by coal is an entropy- The adsorption isotherm of Ca2 + on the coal surface follows the Langmuir equation and the Freundlich equation, but the Freundlich equation has a better linear correlation. At the temperatures of 298, 308 and 315 K, the fractal dimension of the coal particle surface is calculated using the Freundlich adsorption fractal model For 2.640, 2.841 and 2.879.