Abstract Biochar is a highly efficient and attractive candidate for remediation of heavy metals in aqueous media, due to its immense porosity and surface functionalities. In this study farmyard and poultry manure were converted to biochars. The biochars' pre- and post-characterization was performed through various analytical techniques such as thermogravimetry, X-ray photon spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive spectroscopy. The contemporary batch adsorption work articulates the effect of biochars concentration, H+ ion concentration, contact time and temperature on sorption efficiency of Cr(III) ions from aqueous media. The sorption kinetics of Cr(III) was sound tailored to the pseudo-second-order equation which confirmed the chemisorption. The sorption isotherms suggested the well-fitting of Freundlich model due to the unfolding of multilayer adsorption. The Cr(III) sorption was assessed as 37.75 and 33.94 mg/g for farmyard manure and poultry manure-derived biochars, respectively. The thermodynamic values designated the spontaneous and exothermic nature of the reaction.

中文翻译：

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通过天然功能化微孔生物炭从水性介质中吸附 Cr(III)：机理研究

摘要 由于其巨大的孔隙率和表面功能，生物炭是一种高效且有吸引力的修复水介质中重金属的候选者。在这项研究中，农家肥和家禽粪便被转化为生物炭。生物炭的前后表征是通过各种分析技术进行的，例如热重分析、X 射线光子光谱、傅里叶变换红外光谱、扫描电子显微镜和能量色散光谱。当代批量吸附工作阐明了生物炭浓度、H+ 离子浓度、接触时间和温度对水介质中 Cr(III) 离子吸附效率的影响。Cr(III) 的吸附动力学符合伪二级方程，证实了化学吸附。由于多层吸附的展开，吸附等温线表明 Freundlich 模型拟合良好。农家肥和家禽粪便衍生的生物炭的 Cr(III) 吸附量分别为 37.75 和 33.94 毫克/克。热力学值指明了反应的自发性和放热性。