Exploring the impact of washing media on the adsorption properties of Mg–Al Layered Double Hydroxide Nanoparticles

被引：0

作者：

Bokka, Sravan ^{[1
]}

Kumar, Hemant ^{[1
]}

Chowdhury, Anirban ^{[1
]}

机构：

[1] MAPS (Materials' Process - Structure correlations) Laboratory, Metallurgical and Materials Engineering, Indian Institute of Technology Patna, Bihta, Bihar

来源：

Chemosphere | 2024年 / 369卷

关键词：

Adsorption/adsorbents; Azo dyes; Environmental remediation; Ion exchange; Nanoparticles; UV–Visible spectroscopy;

D O I：

10.1016/j.chemosphere.2024.143876

中图分类号：

学科分类号：

摘要：

Environmental remediation has emerged as a critical concern, with dye removal via adsorption being a particularly effective approach. This study demonstrates that appropriately synthesized Mg–Al-Layered Double Hydroxides (LDHs) exhibit exceptional adsorption capacities for anionic dyes. We investigate the impact of different washing media on the material's morphology, surface area, and adsorption capabilities. Notably, washing LDH with ethanol (LDHE) instead of water (LDHW) results in a significant reduction in particle size (70 and 200 nm), a nearly fourfold increase in surface area (197 and 52 m2/g), and a doubling of the maximum adsorption capacity for Congo red (CR) dye. The adsorption studies reveal that LDHE maintains its high CR adsorption efficiency across a variety of pH levels, in the presence of co-existing ions, and in simulated industrial effluent. The ion exchange interaction between the R–SO3- bonds in CR and the cationic layers of LDH (with the loss of carbonate anions) may be responsible for the adsorption. The rapid dye removal at lower concentrations and the impressive maximum adsorption capacity of 2452 mg/g (one of the highest ever reported for pure/single LDH systems) at higher concentrations highlight the potential of LDHE as a valuable adsorbent for large-scale applications. © 2024 Elsevier Ltd

引用

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