Efficient extraction and determination of Au(iii) ions from acid mine drainage and water samples using silica gel immobilized with Brevibacillus borstelensis

IF 2.7 3区 化学 Q2 CHEMISTRY, ANALYTICAL
Aslihan Yilmaz Camoglu, Celal Duran, Duygu Ozdes, Aleyna Nalcaoglu, Kadriye Inan Bektas and Ali Osman Belduz
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Abstract

The analysis of gold, which is a precious metal with limited resources, in environmental samples is crucial for the sustainable utilization of natural resources. Therefore, in the present research we have aimed to develop a novel and environmentally friendly bioadsorbent, Brevibacillus borstelensis loaded on silica gel (BB@Si), with outstanding adsorptive properties that can be implemented for quantitative recovery of Au(III) ions via the solid phase extraction (SPE) technique. After characterizing the developed adsorbent using FTIR and SEM techniques, we conducted a detailed investigation of the critical parameters that influence the extraction performance of Au(III) ions. Optimum parameters were observed as follows: pH 3.0, adsorption contact time 30 min, eluent type 0.1% (w/v) thiourea in 0.5 M HNO3, elution time 60 min, BB@Si amount 1.0 g L−1, and sample volume 400 mL. Some of the well-known isotherm and kinetic models were applied to the results observed from the adsorption studies. Equilibrium adsorption capacity of BB@Si was estimated to be 66.2 mg g−1 utilizing the Langmuir isotherm model while the limit of detection (LOD) and relative standard deviation (RSD%) were established as 0.99 μg L−1 and 3.7%, respectively. The developed method was utilized smoothly for the quantification of Au(III) ions in mining wastewater, acid mine drainage (AMD), streams and seawater.

Abstract Image

硼砂短芽孢杆菌固定化硅胶高效提取测定酸性矿山废水和水样中的Au(III)离子。
金是一种资源有限的贵金属,分析环境样品中的金对自然资源的可持续利用至关重要。因此,在本研究中,我们的目标是开发一种新型的环境友好型生物吸附剂,borstelbrevibacillus borstelensis负载在硅胶(BB@Si)上,具有出色的吸附性能,可以通过固相萃取(SPE)技术实现Au(III)离子的定量回收。在使用FTIR和SEM技术对所开发的吸附剂进行表征后,我们对影响Au(III)离子提取性能的关键参数进行了详细的研究。最佳吸附参数为:pH 3.0,吸附接触时间30 min,洗脱液类型0.1% (w/v)硫脲,0.5 M HNO3,洗脱时间60 min, BB@Si用量1.0 g L-1,进样量400 mL。利用Langmuir等温线模型估计BB@Si的平衡吸附量为66.2 mg g-1,检出限(LOD)为0.99 μg -1,相对标准偏差(RSD%)为3.7%。该方法可顺利用于矿山废水、酸性矿井水、河流和海水中Au(III)离子的定量分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Analytical Methods
Analytical Methods CHEMISTRY, ANALYTICAL-FOOD SCIENCE & TECHNOLOGY
CiteScore
5.10
自引率
3.20%
发文量
569
审稿时长
1.8 months
期刊介绍: Early applied demonstrations of new analytical methods with clear societal impact
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