Application of hydroxyapatite-modified carbonized rice husk for the adsorption of Cr(VI) from aqueous solution

碳化 水溶液 吸附 化学吸附 物理吸附 朗缪尔吸附模型 化学工程 吸热过程 朗缪尔 化学 扩散 离子交换 生物炭 饱和(图论) 吸附 无机化学 离子 热力学 热解 有机化学 工程类 物理 组合数学 数学
作者
Chenglong Zou,Zhiwei Xu,Fahui Nie,Kun Guan,Jiacheng Li
出处
期刊:Journal of Molecular Liquids [Elsevier BV]
卷期号:371: 121137-121137 被引量:35
标识
DOI:10.1016/j.molliq.2022.121137
摘要

Agricultural and forestry waste biomasses have been widely used as adsorbents for environmental remediation with the advantages such as sustainability, economic efficiency, and excellent adsorption performance. A biochar-supported nano-Hydroxyapatite-modified carbonized rice husk ([email protected]) with high-efficiency and low-cost has been developed in our previous study. In this study, the effects of application condition parameters on the adsorption performance of [email protected] for Cr(VI) ions are further investigated. The results illustrate that 99.28 % Cr(VI) ions are removed at 50 °C, pH 2.0 with the adsorbent dosage of 5.0 g/L and the initial Cr(VI) ions concentration of 40 mg/L after adsorption equilibrium. The kinetic data is highly consistent with the pseudo-second-order model, indicating that the adsorption is mainly controlled by chemisorption. It also can be well-described by the the intra-particle diffusion model and Boyd’s film-diffusion kinetic model, indicating the external mass transport is a major process where particle diffusion is the rate-limiting step. Moreover, adsorption data is consistent with the Langmuir isotherm with an adsorption saturation capacity of 14.28 mg/g. It can be speculated that the adsorption mechanism includes physical adsorption, chemical adsorption, and ion exchange. Overall, the value of adsorption enthalpy change (ΔH) is 49.57 kJ/mol through thermodynamic calculations, which is over 40 kJ/mol, suggesting that the adsorption process is chemisorption, whcih is inherently spontaneous and exothermic, and the elevation of the temperature can result in the promotion of adsorption performance. It is anticipated that the composite of [email protected] with high adsorption capacity has the potential to be a newly developed adsorbent for Cr(VI) ions removal with a bright application prospect in environmental protection.
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