College of Environmental and Resource Sciences, College of Carbon Neutral Modern Industry, Fujian Key Laboratory of Pollution Control & Resource Reuse, Fujian Normal University, Fujian Province, Fuzhou 350007, China.
College of Environmental and Resource Sciences, College of Carbon Neutral Modern Industry, Fujian Key Laboratory of Pollution Control & Resource Reuse, Fujian Normal University, Fujian Province, Fuzhou 350007, China.
J Colloid Interface Sci. 2023 May;637:431-440. doi: 10.1016/j.jcis.2023.01.113. Epub 2023 Jan 26.
In this study, nickel (Ni) was recovered from electroplating sludge in the form of Ni(OH) using a bipolar membrane electrodialysis (BMED) system. The results showed that the H generated by the bipolar membrane could effectively desorb Ni from the sludge to the solution and the solution pH considerably affected Ni desorption. The desorption process can be described using the first-order kinetic model. The current density and solid/liquid ratio (m/v) considerably affected Ni recovery. Moreover, 100% of Ni was removed from the electroplating sludge and 93.5% of Ni was recovered after 28 h under a current density of 20 mA/cm, a solid/liquid ratio of 1.0:15 and an electroplating-sludge particle size of 100 mesh. As the number of electroplating compartments increased from one to two and three, the current efficiency for recovering Ni changed from 12.1% to 11.8% and 11.9%, respectively, and the specific energy consumption decreased from 0.064 to 0.048 and 0.039 kW·h/g, respectively. Fourier-transform infrared spectroscopy and Raman spectroscopy showed that the precipitate obtained in this study is similar to commercial Ni(OH) and the purity of Ni(OH) in the obtained precipitate was 79%. Thus, the results showed that the BMED system is effective for recovering Ni from electroplating sludge.
在这项研究中，使用双极膜电渗析（BMED）系统将电镀污泥中的镍（Ni）以 Ni(OH)的形式回收。结果表明，双极膜产生的 H 可有效将 Ni 从污泥中解吸到溶液中，溶液 pH 值对 Ni 解吸有很大影响。解吸过程可以用一级动力学模型来描述。电流密度和固液比（m/v）对 Ni 回收有很大影响。此外，在电流密度为 20 mA/cm、固液比为 1.0:15 和电镀污泥粒径为 100 目的条件下，经过 28 h 处理，Ni 的去除率为 100%，Ni 的回收率为 93.5%。当电镀槽数从一个增加到两个和三个时，回收 Ni 的电流效率分别从 12.1%变为 11.8%和 11.9%，比能耗分别从 0.064 kW·h/g 降低至 0.048 和 0.039 kW·h/g。傅里叶变换红外光谱和拉曼光谱表明，本研究得到的沉淀与商业 Ni(OH)相似，所得沉淀中 Ni(OH)的纯度为 79%。因此，结果表明，BMED 系统可有效从电镀污泥中回收 Ni。
