Chemistry Department, University of Education Lahore (Vehari Campus), Vehari, Punjab, Pakistan.
Busitema University, Tororo, Uganda.
Sci Rep. 2023 May 5;13(1):7356. doi: 10.1038/s41598-023-33902-9.
Cobalt, from industrial waste and nuclear laundry, possess health risk to human beings, animals and plants. Number of methods, other than adsorption, have been reported in literature for Co removal from waste water. In this research walnut shell powder after modification has been utilized for Co adsorption. First step of modification involved chemical treatment by four different organic acids for 72 h. Samples were collected at 24, 48 and 72 h. Second step involved thermal treatment of 72 h samples. Unmodified and modified particles have been analyzed by chemical methods and instruments i.e. UV spectrometer, FTIR, cyclic voltammetry (CV) and microscopic imaging. Thermally treated samples have shown augmented Co adsorption. CV analysis showed thermally treated samples with better capacitance. Particles modified by oxalic acid presented better Co adsorption. Oxalic acid treated particles activated for 72 h with thermal treatment provided maximum adsorption capacity 1327 ± 20.6 mg/g against Co(II) at pH 7, stirring 200 rpm, initial concentration 20 ml, adsorbent dosage (5 mg) and contact time 240 min at room temperature.
钴，来自工业废物和核废水，对人类、动物和植物都存在健康风险。除吸附法外，文献中还报道了许多其他方法用于从废水中去除钴。本研究利用改性后的核桃壳粉末进行钴吸附。改性的第一步是用四种不同的有机酸进行化学处理 72 小时。在 24、48 和 72 小时收集样品。第二步是对 72 小时的样品进行热处理。用化学方法和仪器（如紫外分光光度计、傅里叶变换红外光谱、循环伏安法和微观成像）分析未改性和改性颗粒。热处理后的样品显示出增强的钴吸附。CV 分析表明，具有更好电容的是经过热处理的样品。用草酸改性的颗粒经过 72 小时的热激活处理，在 pH 为 7、搅拌 200rpm、初始浓度 20ml、吸附剂用量（5mg）和接触时间 240min 的条件下，对 Co(II)的最大吸附容量为 1327±20.6mg/g，室温下进行。
