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首页> 外文期刊>Separation and Purification Technology >Interfacial study of surface-modified ZrO2 nanoparticles with thioctic acid for the selective recovery of palladium and gold from electronic industrial wastewater
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Interfacial study of surface-modified ZrO2 nanoparticles with thioctic acid for the selective recovery of palladium and gold from electronic industrial wastewater

机译：用噻虫酸的表面改性Zro2纳米粒子的界面研究，从电子工业废水中选择性回收钯和金

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摘要

The stability and performance of surface-modified zirconia nanoparticles with thioctic acid to effectively and selectively capture Pd(II) and Au(III) ions from industrial electronic waste water were investigated. A particular interest laid in the robustness of the interface in highly acidic and oxidizing environments under real conditions. Surface modifications of commercial nano-ZrO2 were optimized from Bronsted acid-base surface reactions in aqueous solution, either by direct thioctic acid (TOA) grafting or by a two-step process: (i) alendronic acid (AA) grafting and (ii) amide coupling reaction between AA and TOA, giving inorganic-organic hybrid systems designated respectively as ZrO2-TOA and ZrO2-AA-TOA. All materials were thoroughly characterized and had a similar specific surface area (50 m(2).g(-1)). They also demonstrated similar characteristics in terms of thermodynamic and kinetic adsorption data (Langmuir adsorption model and pseudo-second order model). The ATR-FTIR, DRIFT-FTIR and P-31 solid state NMR data elucidated the bidentate bridging and tripodal bonding modes for TOA and AA coordination, respectively. In addition, the DRIFT technique was used to reveal the covalent amide bond between the -NH2 group of the AA group and the -COOH groups of the TOA. The adsorption capacities of ZrO2-TOA at Pd and Au of 44.6 mg/g and 6.3 mg/g respectively, showed that our systems had competitive adsorption capacities and selectivity compared to the literature. Nevertheless, ZrO2-TOA was too sensitive to hydrolysis in high acid concentration ([HCl] > 1 M) and the use of ZrO2-AA-TOA was then mandatory to overcome hydrolytic cleavage of M-OOC bonds in media with high acid concentration. The novel ZrO2-AA-TOA material demonstrated promising stability, efficiency and reusability in industrial applications for gold and palladium recovery.
机译：研究了与硫酸乙酸的表面改性氧化锆纳米颗粒的稳定性和性能有效，选择性地捕获来自工业电子废水的PD（II）和Au（III）离子的Pd（III）离子。在真实条件下，在高度酸性和氧化环境中奠定了特殊的兴趣。商业纳米ZrO2的表面改性在水溶液中的铜甾酸碱表面反应优化，通过直接硫酸（TOA）接枝或通过两步方法：（i）族乳酸（AA）嫁接和（II） AA和TOA之间的酰胺偶联反应，其含有ZrO2-ToA和ZrO2-AA-ToA表示的无机 - 有机混合体系。所有材料彻底表征并具有类似的比表面积（50μm（2）.g（-1））。它们还在热力学和动力学吸附数据（Langmuir吸附模型和伪二阶模型）方面展示了类似的特征。 ATR-FTIR，Drift-FTIR和P-31固态NMR数据分别为TOA和AA协调分别阐明了双头桥接和三码头键合模式。此外，漂移技术用于揭示AA基团和TOA的-NOOH基团之间的共价酰胺键。 ZrO2-ToA在Pd和Au的吸附容量分别为44.6mg / g和6.3mg / g，表明我们的系统与文献相比具有竞争性的吸附能力和选择性。然而，ZrO2-ToA对高酸浓度（[HCl]> 1M）的水解过于敏感，然后强制使用ZrO2-AA-ToA的使用以克服具有高酸浓度的培养基中的M-OOC键的水解切割。新型Zro2-AA-TOA材料在黄金和钯回收率中表现出对工业应用中的有希望的稳定性，效率和可重用性。

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