Abstract

The sodium salt of 5-aminoisothalate (5-AIT), which has –NH₂ and –COO^–Na⁺ functions, is a highly water-soluble compound. It was used as reducing and capping agents to develop AuNPs. When sodium borohydride (SBH) was not used as a reducing agent, the developed methodology resulted in particles that were larger in size (5-AIT-AuNPs-L, 14 ± 1.83 nm) than those obtained by the SBH-reduction method (5-AIT-AuNPs-S, 10 ± 2.03 nm). The surface plasmon resonance band for the smaller particles is centered at 520 nm, but it is positioned at 528 nm for the bigger particles. The particles have a wide window of pH tolerable range, i.e., pH 3–10. The capping agents adsorb onto the surface of particles, as evidenced by emission and the Raman spectroscopies and computation analysis. The binding energy increases with the increase of cluster atoms and it is –1.85 eV for 5-AIT-Au₅ cluster. The efficacy of the particles as dye-degradation nanocatalysts for not only well-reputed dye, Methyl Orange (MO) but also synthetic promising dyes (Uazo-1 and Uazo-2) based on 6-aminouracil was assessed. The degradation kinetics follow pseudo-first-order reactions. According to the findings, the smaller particles degrade the dyes more rapidly than the larger particles.

中文翻译：

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新开发的 5-氨基间苯二甲酸酯封端金纳米粒子用于降解偶氮染料的研究

摘要

5-氨基异酞酸盐（5-AIT）的钠盐，含有-NH ₂和-COO ^- Na ⁺功能，是一种高度水溶性的化合物。它被用作开发金纳米粒子的还原剂和封端剂。当不使用硼氢化钠 (SBH) 作为还原剂时，所开发的方法产生的颗粒尺寸 (5-AIT-AuNPs-L，14 ± 1.83 nm) 比通过 SBH 还原方法获得的颗粒 (5 -AIT-AuNPs-S，10 ± 2.03 nm）。较小颗粒的表面等离子体共振带以 520 nm 为中心，但较大颗粒的表面等离子体共振带位于 528 nm。该颗粒具有较宽的 pH 耐受范围，即 pH 3-10。发射、拉曼光谱和计算分析证明，封端剂吸附在颗粒表面。_{结合能随着团簇原子的增加而增加，5-AIT-Au 5}的结合能为 –1.85 eV簇。评估了这些颗粒作为染料降解纳米催化剂的功效，不仅适用于广受好评的染料甲基橙 (MO)，还适用于基于 6-氨基尿嘧啶的合成有前景的染料（Uazo-1 和 Uazo-2）。降解动力学遵循伪一级反应。根据研究结果，较小的颗粒比较大的颗粒降解染料的速度更快。