Li Zhicheng, Zhou Tao, Liao Jiangfan, Li Xiufeng, Ma Wenhui, Lv Guoqiang, Zhao Shimin
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
School of Engineering, Yunnan University, Kunming 650500, China.
Molecules. 2025 Jan 8;30(2):223. doi: 10.3390/molecules30020223.
Diamond-wire sawing silicon waste (DSSW) derived from the silicon wafer sawing process may lead to resource waste and environmental issues if not properly utilized. This paper propounds a simple technique aimed at enhancing the efficiency of hydrogen production from DSSW. The hydrolysis reaction is found to become faster when DSSW is ground. Among the studied grinding agents, KCl has the best performance. The grinding duration and addition amount remarkably affect the final hydrogen yield and initial hydrogen generation rate (IHGR). Among all studied samples, DSSW-KCl 25 wt% ground for 3 min shows the best performance with a hydrogen yield of 86.1% and an IHGR of 399.37 mL min (g DSSW) within 650 s. The initial temperature is also found to have a significant influence on the hydrolysis of the DSSW-KCl mixture, and the reaction can proceed to 85% conversion in 100 s with an IHGR of 1383.6 mL min (g DSSW) at 338 K. The apparent activation energy for the hydrolysis reaction of the DSSW-KCl composite powder was found to be 45.62 kJ mol by means of an Arrhenius plot. The rate-determining step for the rapid reaction of DSSW to produce hydrogen is chemical reaction control, while the slow reaction is controlled by diffusion.
源自硅片切割工艺的金刚石线锯切割硅废料（DSSW）若未得到妥善利用，可能会导致资源浪费和环境问题。本文提出了一种旨在提高利用DSSW制氢效率的简单技术。研究发现，将DSSW研磨后水解反应会加快。在所研究的研磨剂中，KCl的性能最佳。研磨时间和添加量对最终产氢量和初始产氢速率（IHGR）有显著影响。在所有研究样品中，研磨3分钟的25 wt% DSSW-KCl表现最佳，产氢量为86.1%，在650秒内的IHGR为399.37 mL min（g DSSW）。还发现初始温度对DSSW-KCl混合物的水解有显著影响，在338 K时，反应可在100秒内进行至85%的转化率，IHGR为1383.6 mL min（g DSSW）。通过阿伦尼乌斯图发现，DSSW-KCl复合粉末水解反应的表观活化能为45.62 kJ mol。DSSW快速产氢反应的速率决定步骤是化学反应控制，而缓慢反应则由扩散控制。
