Abstract The use of Pt (IV) salts in different processes generates, even at low concentrations, toxic residuals that contaminate natural waters. For this reason, the improvement of limit of detection in Pt(IV) quantification for control and monitoring purposes, as well as, the development of methodologies for remediation is convenient. This study was aimed at the assessment of the dead Aspergillus niger O-5 biomass without treatment and chemically treated as sorbents for Pt(IV) concentration. The influence of pH and volume of dissolution, sorbent mass and contact time on the Pt(IV) sorption capacity of materials was studied. At optimized experimental conditions, a maximum sorption capacity of 79.63 ± 0.03 mg·g−1 was achieved using cetyltrimethylammonium bromide (CTAB)- treated biomass. A good fitting of the pseudo-second-order model of Ho to the experimental kinetic data suggested that chemisorption or chemical reactivity processes are involved in the biosorption. Those processes could be explained via the substitution of the hydrogen present in N-H bonds of amide groups on the biomass surface for Pt(IV) species in dissolution. This hypothesis was supported by the XPS analysis results. The best Pt(IV) desorption equal to 99% was achieved, when 15% (m/v) thiourea dissolution was used as eluent.

中文翻译：

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用于修复和/或分析目的的黑曲霉 O-5 生物质上的 Pt(IV) 吸附研究

摘要 在不同过程中使用 Pt (IV) 盐会产生污染天然水体的有毒残留物，即使在低浓度下也是如此。出于这个原因，用于控制和监测目的的 Pt(IV) 定量检测限的改进，以及修复方法的开发是方便的。本研究旨在评估未经处理和化学处理的死黑曲霉 O-5 生物质作为 Pt(IV) 浓度的吸附剂。研究了 pH 值和溶解体积、吸附剂质量和接触时间对材料的 Pt(IV) 吸附能力的影响。在优化的实验条件下，使用十六烷基三甲基溴化铵 (CTAB) 处理的生物质实现了 79.63 ± 0.03 mg·g-1 的最大吸附容量。Ho 的准二级模型与实验动力学数据的良好拟合表明生物吸附涉及化学吸附或化学反应过程。这些过程可以通过生物质表面酰胺基的 NH 键中存在的氢取代溶解中的 Pt(IV) 物质来解释。这一假设得到了 XPS 分析结果的支持。当使用 15% (m/v) 硫脲溶解作为洗脱液时，实现了等于 99% 的最佳 Pt(IV) 解吸。这一假设得到了 XPS 分析结果的支持。当使用 15% (m/v) 硫脲溶解作为洗脱液时，实现了等于 99% 的最佳 Pt(IV) 解吸。这一假设得到了 XPS 分析结果的支持。当使用 15% (m/v) 硫脲溶解作为洗脱液时，实现了等于 99% 的最佳 Pt(IV) 解吸。