Abstract

A new adeninecarboxamide ligand, N-(9 H-purin-6-yl) pyridine-2-carboxamide (H₂pzac) has been synthesized by a green chemistry method using tetrabutylammunium bromide (TBAB) ionic liquid as an environmentally friendly reaction medium. The H₂pzac ligand was anchored on modified SBA-15-Cl and utilized for detection of Hg²⁺ in aqueous solution. The as-constructed SBA-15@Hpzac sensor shows a high specific surface area as well as pore volume of 250 m²/g and 0.54 cm³/g, respectively. The fluorescence assessment indicated that the designed SBA-15@Hpzac sensor presented highly sensitive and selective behavior to Hg²⁺ ion over different cations including Zn²⁺, Ni²⁺, Co²⁺, Cu²⁺, Mn²⁺, Pb²⁺, Ba²⁺, Mg²⁺, Ca²⁺, Na⁺, Fe³⁺, Fe²⁺, Al³⁺, Cd²⁺ and K⁺. The fluorescence response of the SBA-15@Hpzac sensor for selective detection of Hg²⁺ ion is excellent with detection limit (LOD) of 1.07 × 10^− 6 M. The application of the SBA-15@Hpzac sensor in determination of Hg²⁺ ions in two real water samples was also investigated.

中文翻译：

---

羧酰胺：接枝在 SBA-15 纳米结构上的化学传感器，用于选择性检测水溶液中的 Hg2+ 离子

摘要

以四丁基溴化铵(TBAB)离子液体为环境友好的反应介质，通过绿色化学方法合成了一种新型腺嘌呤甲酰胺配体N-(9 H-嘌呤-6-基)吡啶-2-甲酰胺(H ₂ pzac)。 H ₂ pzac 配体锚定在修饰的SBA-15-Cl 上并用于检测水溶液中的Hg ²⁺ 。所构建的SBA-15@Hpzac传感器表现出高比表面积以及分别为250 m ² /g和0.54 cm ³ /g的孔体积。荧光评估表明，所设计的SBA-15@Hpzac传感器对Hg ^{2+离子相对于Zn 2+}、Ni ²⁺、Co ²⁺、Cu ²⁺、Mn ²⁺、Pb ^{2 等}不同阳离子表现出高度灵敏和选择性的行为⁺、Ba ²⁺、Mg ²⁺、Ca ²⁺、Na ⁺、Fe ³⁺、Fe ²⁺、Al ³⁺、Cd ²⁺和K ⁺。 SBA-15@Hpzac 传感器选择性检测 Hg ²⁺离子的荧光响应非常好，检测限 (LOD) 为 1.07 × 10 ^{− 6}  M。SBA-15@Hpzac 传感器在 Hg ²测定中的应用还研究了两个真实水样中的^+离子。