Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Hezar Jarib Ave, Isfahan, Iran.
Department of Biotechnology, Faculty of Advanced Sciences and Technologies, University of Isfahan, Hezar Jarib Ave, Isfahan, Iran.
Waste Manag. 2019 Feb 15;85:264-271. doi: 10.1016/j.wasman.2018.12.045. Epub 2019 Jan 3.
The capability of oxalic acid produced by Aspergillus niger was investigated for bioleaching of platinum from a refinery reforming catalyst. The spent medium mode was selected for bioleaching because of its higher efficiency at favorable pH and temperature conditions. The effects of several important factors such as the pulp density, pH and temperature on platinum recovery were optimized using Box-Behnken design of response surface methodology. The results indicated that pH adjustment during the bioleaching process increases the final platinum recovery significantly. The obtained optimum conditions were 1% for the pulp density, 0.5 for the medium pH, and 70 °C for the temperature which led to 37% platinum recovery. The significance of oxalic acid as the leaching agent in platinum bioleaching was highlighted by investigating the recovery of a blank medium without oxalic acid at the optimum conditions which was just about 13%. The presented method can be utilized in an environmentally friendly process to recover platinum from industrial catalysts.
研究了黑曲霉产生的草酸对炼油重整催化剂中铂的生物浸出能力。由于在有利的 pH 值和温度条件下具有更高的效率，选择了浸出渣模式进行生物浸出。利用响应面法的 Box-Behnken 设计优化了几个重要因素，如矿浆密度、pH 值和温度对铂回收的影响。结果表明，生物浸出过程中的 pH 值调整显著提高了最终的铂回收率。获得的最佳条件为：矿浆密度为 1%，介质 pH 值为 0.5，温度为 70°C，在此条件下铂的回收率达到 37%。通过在最佳条件下研究没有草酸的空白介质的回收情况（仅为 13%），突出了草酸作为浸出剂在铂生物浸出中的重要性。该方法可用于一种环保的工艺，从工业催化剂中回收铂。
