The adsorption of malachite green onto activated carbon prepared from apricot stones material has been investigated at batch conditions. The effects of contact time (0–60 min), initial pH (3–11), agitation speed (100–700 r/min), temperature (298–343 K), adsorbent dose (1–10 g/L), and malachite green concentration (4.45–17.6 mg/L) on the malachite green adsorption by apricot stones material have been studied. Malachite green removal increases over the contact time until equilibrium. The batch adsorption experiments were carried out to optimize the physical parameters on the malachite green removal efficiency. It has been found that 23.80 mg/g at 25°C and 88.05 mg/g at 70°C were removed. The kinetic parameters, rate constants and equilibrium adsorption capacities, were calculated and discussed for each kinetic model. The adsorption of malachite green onto apricot stones material is well described by the pseudo second-order equation. The experimental isotherm data were analyzed by different models; the adsorption follows the Langmuir model, providing a better fit of the equilibrium data. The thermodynamics parameters such as the negative free energy ΔG° (−0.191 to −4.447 kJ/mol) and positive enthalpy ΔH° (50.86 kJ/mol) indicated the spontaneous and endothermic nature of the malachite green adsorption with a chemisorption process.

中文翻译：

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杏石材料（ASM）吸附剂制备活性炭去除水溶液中孔雀石绿（MG）的实验研究

在批量条件下研究了孔雀石绿在由杏核材料制备的活性炭上的吸附。接触时间（0-60 分钟）、初始 pH（3-11）、搅拌速度（100-700 r/min）、温度（298-343 K）、吸附剂剂量（1-10 g/L）的影响，研究了孔雀石绿浓度（4.45-17.6 mg/L）对杏核材料吸附孔雀石绿的影响。孔雀石绿去除率随着接触时间的增加而增加，直至达到平衡。进行批量吸附实验以优化孔雀石绿去除效率的物理参数。已经发现在 25°C 下去除了 23.80 mg/g 和在 70°C 下去除了 88.05 mg/g。对每个动力学模型计算并讨论了动力学参数、速率常数和平衡吸附容量。孔雀石绿对杏核材料的吸附可以用伪二阶方程很好地描述。实验等温线数据采用不同模型进行分析；吸附遵循朗缪尔模型，提供了更好的平衡数据拟合。热力学参数如负自由能 ΔG°（-0.191 至 -4.447 kJ/mol）和正焓 ΔH°（50.86 kJ/mol）表明孔雀石绿吸附具有化学吸附过程的自发和吸热性质。