科研之友
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摘要
Removing heavy metals from wastewater is a significant challenge in environmental remediation, and many materials have been studied for their heavy metal adsorption potential. This study investigated the ability of raw coconut fiber residue (CFR), a durable, cost-effective lignocellulose material, to adsorb divalent cadmium (Cd(II)). First, experiments analyzed the influence of pH on CFR adsorption of Cd(II). Cd(II) effectively adsorbed onto CFR; the optimum pH value for adsorption was approximately 5.5. Second, the study examined the adsorption kinetics of Cd(II) by CFR under different initial Cd(II) concentrations and different CFR dosages. Three kinetic models were used to investigate the adsorption mechanism, including pseudo-first-order kinetic, pseudo-second-order kinetic, and intraparticle diffusion models. The adsorption aligned with the second-order kinetic model, with an adsorption isotherm that was well described by the Langmuir model. The data from the Langmuir models were used to determine thermodynamic parameters. The maximum adsorption capacity of CFR for Cd(II) was 62.512mg/g, significantly higher than other lignocellulosic materials. Finally, the study evaluated adsorption mechanisms, using Fourier transform infrared spectroscopy, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy results, and the Dubinin-Radushkevich (D-R) isotherm model and thermodynamic results. Cd(II)) biosorption occurred by chemisorption, though Cd(II) complexation by the CFR surface groups. This research found that CFR may be a promising biosorbent for removing Cd(II) from aqueous solutions, and therefore, could represent a new potential tool for wastewater treatment.
- 出版日期2016-7-8
- 单位上海应用技术大学; 暨南大学; 广东省生态环境技术研究所
