ZnAl/LDH@CQD: Synthesis, Characterization and Use as Adsorbent

IF 2.6 4区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

ChemNanoMat Pub Date : 2024-07-19 DOI:10.1002/cnma.202400082

Daniely Carlos Henrique, Pollyanna Vanessa dos Santos Lins, Danilo Henrique da Silva Santos, Luiz Daniel da Silva Neto, Jordana Georgin, Dison Stracke Pfingsten Franco, Simoni Margareti Plentz Meneghetti, Lucas Meili

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引用次数: 0

Abstract

This work aimed to evaluate the synthesis of the ZnAl/layered double hydroxides (LDH) composite with carbon quantum dots (CQD) and its application in water treatment. The synthesis of the ZnAl/LDH@CQD composite was carried out by the co‐precipitation method, being characterized by XRD, FTIR, pHZCP, SEM, EDX, TG, and N2 adsorption/desorption. The results presented a composite with a mesoporous structure, satisfactory values of surface area (18.72 m2 g‐1), and pore size (14.78 nm). Preliminary adsorption tests were carried out, and the composite was efficient in removing some dyes and drugs. The kinetic and equilibrium data for the adsorption study for methylene blue fit best the General Order and Liu models, respectively, with maximum adsorption capacity occurring at 30°C (12.11 mg g‐1). Thermodynamic analysis indicated that the adsorption of MB was exothermic and spontaneous, governed mostly by physical processes. The regeneration of the adsorbent was carried out by oxidation with hydrogen peroxide (250 mmol), showing a 20.93% reduction in the percentage of removal after the first cycle and remaining practically constant until the sixth cycle. These results present an efficient way of using CQD composite as an adsorbent material, with potential application in water purification for human and environmental use.

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ZnAl/LDH@CQD: 合成、表征及用作吸附剂

本研究旨在评估 ZnAl/层状双氢氧化物（LDH）与碳量子点（CQD）复合材料的合成及其在水处理中的应用。采用共沉淀法合成了 ZnAl/LDH@CQD 复合材料，并通过 XRD、FTIR、pHZCP、SEM、EDX、TG 和 N2 吸附/解吸对其进行了表征。结果表明，该复合材料具有介孔结构、令人满意的表面积（18.72 m2 g-1）和孔径（14.78 nm）。进行了初步的吸附测试，该复合材料能有效地去除一些染料和药物。亚甲基蓝吸附研究的动力学和平衡数据分别最符合普阶模型和刘氏模型，最大吸附容量出现在 30°C 时（12.11 mg g-1）。热力学分析表明，甲基溴的吸附是放热和自发的，主要由物理过程控制。吸附剂的再生是用过氧化氢（250 毫摩尔）进行的，结果表明，在第一个循环之后，去除率降低了 20.93%，在第六个循环之前几乎保持不变。这些结果提供了一种将 CQD 复合材料用作吸附材料的有效方法，有望应用于人类和环境用水的净化。

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来源期刊

ChemNanoMat Energy-Energy Engineering and Power Technology

CiteScore

6.10

自引率

2.60%

发文量

236

期刊介绍： ChemNanoMat is a new journal published in close cooperation with the teams of Angewandte Chemie and Advanced Materials, and is the new sister journal to Chemistry—An Asian Journal.