College of Urban and Environmental Sciences, Hubei Normal University, Huangshi, 435002, Hubei, China.
Huangshi Key Laboratory of Prevention and Control of Soil Pollution (Hubei Normal University), Huangshi, 435002, Hubei, China.
Environ Sci Pollut Res Int. 2024 Mar;31(11):16782-16794. doi: 10.1007/s11356-024-32222-3. Epub 2024 Feb 7.
In recent years, cadmium pollution in water environment has become an environmental problem that could not be ignored. As a porous carbon rich solid material, biochar is an environment-friendly new material because of its ultra-high adsorption capacity and strong chemical stability. In this study, rice straw biochar (RS-Biochar) was successfully prepared at different temperatures for removal of Cd(II) from aqueous solution. Through a series of characterization and adsorption experiments, the adsorption principle of Cd(II) by RS-Biochar was deeply studied. The results showed that RS-Biochar prepared at 600 °C (BioC600) has high specific surface area (232.6 m/g) and shows high Cd(II) removal rate of 91.23% with the maximum Cd(II) adsorption capacity of 8.62 mg/g. The Langmuir model fit well to describe the adsorption process of Cd(II) on the BioC600. The mechanism analysis showed that hydroxyl and carboxyl groups on the biochar surface were concerned in the removal of Cd(II). The formation of CdCO in the adsorption process was also be proven. Importantly, RS-Biochar could be conveniently produced with needed scale, displaying a promising approach for remediating Cd(II)-contaminated water environment and a huge application potential.
近年来，水环境中的镉污染已成为一个不可忽视的环境问题。生物炭作为一种富含多孔碳的固体材料，因其超高的吸附能力和较强的化学稳定性而成为一种环保的新材料。本研究采用不同温度成功制备了水稻秸秆生物炭（RS-Biochar），用于从水溶液中去除 Cd(II)。通过一系列的表征和吸附实验，深入研究了 RS-Biochar 吸附 Cd(II)的原理。结果表明，在 600°C 下制备的 RS-Biochar（BioC600）具有较高的比表面积（232.6 m/g），对 Cd(II)的去除率高达 91.23%，最大吸附容量为 8.62mg/g。Langmuir 模型很好地拟合了 Cd(II)在 BioC600 上的吸附过程。机理分析表明，生物炭表面的羟基和羧基参与了 Cd(II)的去除。吸附过程中形成了 CdCO。重要的是，RS-Biochar 可以方便地大规模生产，为修复 Cd(II)污染的水环境提供了一种很有前途的方法，具有巨大的应用潜力。
