Biomass-derived charcoal, possessing high surface area, temperature resistance, and stability, has diverse applications. Traditional methods overlook its conductivity. In this work, a new approach was devised. By controlling the pyrolysis temperature and preparation atmosphere, rice straw was converted into biochar electrodes at 1000 °C in a N₂-containing environment. The temperature effect on the conductivity of biochar made from rice straw was elucidated through methods such as resistivity measurement, XRD, and Raman spectroscopy. Furthermore, the biochar electrode material was employed as the cathode and the electro-deposition method was employed to treat wastewater containing Cd. The results indicated that the treatment efficiency of simulated Cd wastewater can reach a maximum of 88.96 % in 7 h at relatively low power consumption. After the reaction, a simple acid washing step effectively separated the electrode and Cd, which allowed the Cd to be recovered and the electrode to be used again. This method offers a innovative low-cost, high-efficiency technique for preparing biochar electrodes from rice straw, achieving sustainable waste conversion while providing new techniques and novel solutions for electro-deposition in heavy metal wastewater treatment. Therefore, the research hold significant practical a significance and scientific value.

中文翻译：

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基于导电秸秆的生物炭电极用于直流电化学沉积废水中镉的去除和回收


生物质木炭具有高表面积、耐温性和稳定性，具有多种用途。传统方法忽视了它的导电性。在这项工作中，设计了一种新方法。通过控制热解温度和制备气氛，在1000℃的含N2环境下将稻草转化为生物炭电极。通过电阻率测量、X射线衍射和拉曼光谱等方法阐明了温度对稻草生物炭电导率的影响。此外，以生物炭电极材料为阴极，采用电沉积方法处理含镉废水。结果表明，在相对较低的电耗下，模拟镉废水的处理效率在7 h内最高可达88.96%。反应后，简单的酸洗步骤有效地分离了电极和Cd，从而可以回收Cd并再次使用电极。该方法为稻草制备生物炭电极提供了一种低成本、高效的创新技术，实现了废物的可持续转化，同时为电沉积处理重金属废水提供了新技术和新解决方案。因此，本研究具有重大的现实意义和科学价值。