Liu Le, Yu Wanjin, Zhang Zheren, Li Qiyao, Peng Chun, Wu Kaisheng, Liu Duoduo, He Sufang, Liu Nengsheng, Li Xiang
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
State Key Laboratory of Fluorinated Greenhouse Gases Replacement and Control Treatment, Zhejiang Research Institute of Chemical Industry, Hangzhou 310023, China.
Materials (Basel). 2025 May 18;18(10):2348. doi: 10.3390/ma18102348.
Biochar modification represents an effective approach for enhancing adsorption capacity. In the research, industrial hemp straw-derived biochar was synthesized through hydrothermal carbonization coupled with ultrasound-assisted KOH activation, demonstrating exceptional Pb adsorption efficiency. The optimal HBS50-K0.5M exhibited excellent adsorption performance, achieving the maximum adsorption capacity of 345.8 mg/g within 2 h. The etching effect of KOH on the biochar surface increased the O-containing functional groups, which enhanced the adsorption of Pb. The adsorption kinetics revealed that the adsorption process of Pb was aligned with the pseudo-second-order kinetics as well as the Langmuir model. The complexation, ion exchange, π-π interaction, as well as electrostatic interaction participated in the adsorption. This study demonstrates that ultrasound-assisted KOH-activated biochar has great potential for removing Pb from wastewater.
生物炭改性是提高吸附能力的有效方法。在该研究中，通过水热碳化结合超声辅助KOH活化合成了工业大麻秸秆衍生生物炭，其对铅的吸附效率极高。最佳的HBS50-K0.5M表现出优异的吸附性能，在2小时内实现了345.8 mg/g的最大吸附容量。KOH对生物炭表面的蚀刻作用增加了含O官能团，从而增强了对铅的吸附。吸附动力学表明，铅的吸附过程符合准二级动力学以及朗缪尔模型。络合、离子交换、π-π相互作用以及静电相互作用都参与了吸附过程。该研究表明，超声辅助KOH活化生物炭在去除废水中的铅方面具有巨大潜力。
