Pine needle biochar (PNB) has been examined as a promising cost-effective adsorbent using batch method for mitigation of Malachite green (MG) dye from synthetic wastewater. The effects of time of equilibration, equilibrium pH, dye concentration and temperature have been studied on adsorption of malachite green. Adsorption kinetics of MG onto PNB conformed to pseudo-first-order reaction. Adsorption of the dye onto PNB fitted well to Freundlich isotherm model indicating that multilayer adsorption and adsorption capacities (K_F) are the highest (6837.40 mg/kg) at pH 7.0, intermediate (4073.61 mg/kg) at pH 9.0 and minimum (1196.05 mg/kg) at pH 4.6. Adsorption of malachite green regularly increased with increase in temperature. The evaluation of thermodynamic parameters indicate that adsorption of MG onto PNB was a spontaneous and endothermic reaction with increase in the disorderliness of the system. Fourier transformed infra-red spectroscopy (FTIR) studies indicate involvement of H-bonding and electron exchange between aromatic nuclei and electron donor groups onto PNB.

中文翻译：

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松针生物炭作为一种低成本吸附剂用于去除废水中的孔雀石绿染料

松针生物炭 (PNB) 已被认为是一种有前途的经济高效的吸附剂，使用批处理方法可以减轻合成废水中的孔雀石绿 (MG) 染料。研究了平衡时间、平衡p H、染料浓度和温度对孔雀石绿吸附的影响。MG在PNB上的吸附动力学符合准一级反应。染料到PNB的吸附装好到Freundlich等温模型，表明多层吸附和吸附容量（K _˚F）是在最高（6837.40毫克/千克）p ħ7.0，中间体（4073.61毫克/千克）在p ħ9.0和最小(1196.05 mg/kg) 在p4.6. 随着温度的升高，孔雀石绿的吸附有规律地增加。热力学参数的评估表明，MG 在 PNB 上的吸附是一种自发的吸热反应，系统的无序性增加。傅里叶变换红外光谱 (FTIR) 研究表明，芳香核和电子供体基团之间的氢键和电子交换涉及到 PNB。