Bwatanglang Ibrahim Birma, Mohammad Faruq, Janet John Nahadi, Dahan Wasmia Mohammed, Al-Lohedan Hamad A, Soleiman Ahmed A
Department of Pure and Applied Chemistry, Adamawa State University, Mubi 650001, Nigeria.
Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
Gels. 2023 Jul 17;9(7):581. doi: 10.3390/gels9070581.
In this study, we tested the biosorption capacity of trimethyl chitosan (TMC)-ZnO nanocomposite (NC) for the adsorptive removal of () in aqueous suspension. For the formation of ZnO NPs, we followed the green synthesis route involving (TM) aqueous leaf extract as a reducing agent, and the formed ZnO particles were surface-coated with TMC biopolymer. On testing of the physicochemical characteristics, the TM@ZnO/TMC (NC) hydrogel showed a random spherical morphology with an average size of 31.8 ± 2.6 nm and a crystal size of 28.0 ± 7.7 nm. The zeta potential of the composite was measured to be 23.5 mV with a BET surface area of 3.01 m g. The spectral profiles of TM@ZnO/TMC NC hydrogel on interaction with () revealed some conformational changes to the functional groups assigned to the stretching vibrations of N-H, C-O-C, C-O ring, and C=O bonds. The adsorption kinetics of TM@ZnO/TMC NC hydrogel revealed the pseudo-second-order as the best fit mechanism for the biosorption. The surface homogeneity and monolayer adsorption of the TM@ZnO/TMC NC hydrogel reflects majorly the entire adsorption mechanism, observed to display the highest correlation for Jovanovic, Redlich-Peterson, and Langmuir's isotherm models. Further, with the use of TM@ZnO/TMC NC hydrogel, we measured the highest adsorption capacity of to be 4.90 × 10 mg g, where an in-depth mechanistic pathway was proposed by making use of the FTIR analysis.
在本研究中，我们测试了三甲基壳聚糖（TMC）-氧化锌纳米复合材料（NC）对水悬浮液中（此处原文括号内容缺失，无法准确翻译）的吸附去除生物吸附能力。为了形成氧化锌纳米颗粒，我们采用了绿色合成路线，使用（此处原文括号内容缺失，无法准确翻译）（TM）水提叶提取物作为还原剂，并且将形成的氧化锌颗粒用TMC生物聚合物进行表面包覆。在对其物理化学特性进行测试时，TM@ZnO/TMC（NC）水凝胶呈现出随机球形形态，平均尺寸为31.8±2.6纳米，晶体尺寸为28.0±7.7纳米。该复合材料的zeta电位经测量为23.5毫伏，BET表面积为3.01平方米/克。TM@ZnO/TMC NC水凝胶与（此处原文括号内容缺失，无法准确翻译）相互作用时的光谱特征显示，分配给N-H、C-O-C、C-O环和C=O键伸缩振动的官能团发生了一些构象变化。TM@ZnO/TMC NC水凝胶的吸附动力学表明，拟二级动力学是对（此处原文括号内容缺失，无法准确翻译）生物吸附的最佳拟合机制。TM@ZnO/TMC NC水凝胶的表面均匀性和单层吸附主要反映了整个吸附机制，观察发现其与约万诺维奇、雷德利希-彼得森和朗缪尔等温线模型的相关性最高。此外，使用TM@ZnO/TMC NC水凝胶时，我们测得（此处原文括号内容缺失，无法准确翻译）的最高吸附容量为4.90×10毫克/克，在此通过傅里叶变换红外光谱分析提出了深入的作用机制途径。
