Construction of PAC@Zeolite@GO composite with high adsorption capacity and environmentally friendly for defluoridation by synergistic effects

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-01-23 DOI:10.1016/j.micromeso.2025.113521

Ting Wang , Juan Liu , Ting Li , Jinshui Mao , Zhaoqi Shao , Xiaocheng Li , Sili Ren

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引用次数: 0

Abstract

Toxic fluoride-containing industrial wastewater discharged from rare earth mining, coal, and metallurgical industries has been considered as one of the major problems threatening human health. Seeking ultra-high adsorption capacity, low secondary pollution and low-cost fluoride adsorption technologies from wastewater has been the goal of environmental remediation. In this study, based on a photo-catalytic reduction reaction, the polyaluminum chloride (PAC) and graphene oxide (GO) co-modified zeolite (PAC@Zeolite@GO composite) were synthesized for efficiently removing fluoride from wastewater. Under optimal conditions (pH = 3, t = 240 min, T = 298 K, m = 25 mg L⁻¹, C₀ = 450 mg L⁻¹), the adsorption capacity of PAC@Zeolite@GO composite toward fluoride was as high as ∼1264 mg g⁻¹. Even after 3 times of recycling, the adsorption capacity could still reach 978.3 mg g⁻¹. The fitting results of kinetics, isotherm and thermodynamics indicated that the adsorption process is an endothermic one, complies with the Langmuir isothermal adsorption and the pseudo-second-order kinetic model. The residual F⁻ after PAC@Zeolite@GO composite adsorption and dissolved Al³⁺ were as low as 0.69 mg L⁻¹ and 0.09 mg L⁻¹, which reached the drinking water standard. The prominent adsorption ability of PAC@Zeolite@GO composite was attributed to electrostatic adsorption, ion exchange, hydrogen bond and complexation reactions. Based on their efficient performance, the PAC@Zeolite@GO composite is expected to be an effective and environmentally friendly, low-cost adsorbent for the defluorination of wastewater.

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.