Gangue-Based SiO2 Aerogel Used for Pb(II) Adsorption in Wastewater and Mechanism Analysis

IF 3.8 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Water, Air, & Soil Pollution Pub Date : 2024-08-31 DOI:10.1007/s11270-024-07473-y

Xu Liu, Xiaomin Kong, Hao Wen, Yue Wang, Meili Wu, Hongwei Yin, Wei Qin, Manli Wang, Jun Pei, Miaoming Qu

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Abstract

Coal gangue, a byproduct of coal mining with massive generation, presents a major challenge for resource utilization. In this study, SiO₂ aerogel was successfully fabricated from coal gangue, via a facile and cost-effective approach. The aerogel boasts an intricate network framework structure internally and functions as a mesoporous material with measurements of 154.5662 m²·g⁻¹ for specific surface area and 7.9557 nm for average pore size. Additionally, exploring the adsorption capabilities of SiO₂ aerogel concerning Pb(II) in wastewater, the research revealed insights. The results demonstrated that the maximum Pb(II) removal efficiency reached 94.09% under pH 6, aerogel dosage of 1.5 g·L⁻¹, and initial Pb(II) concentration of 80 mg·L⁻¹. The adsorption process followed the Langmuir isotherm model and pseudo-second-order kinetic model, suggesting a favorable and predominantly monomolecular layer chemisorption, and the intraparticle diffusion model suggests internal diffusion behavior during adsorption. The SiO₂ aerogel exhibited specific adsorption behavior towards Pb(II). This study offers a promising avenue for repurposing coal gangue while addressing the issue of Pb(II)-contaminated wastewater.

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用于吸附废水中铅（II）的煤矸石基二氧化硅气凝胶及其机理分析

煤矸石是煤炭开采过程中产生的大量副产品，给资源利用带来了重大挑战。本研究采用一种简便、经济的方法，从煤矸石中成功制备出二氧化硅气凝胶。气凝胶内部具有复杂的网络框架结构，是一种介孔材料，比表面积为 154.5662 m2-g-1，平均孔径为 7.9557 nm。此外，研究还探索了二氧化硅气凝胶对废水中铅（II）的吸附能力。结果表明，在 pH 值为 6、气凝胶用量为 1.5 g-L-1、初始 Pb(II) 浓度为 80 mg-L-1 的条件下，Pb(II) 的最大去除率达到 94.09%。吸附过程遵循 Langmuir 等温线模型和伪二阶动力学模型，表明吸附过程中主要是单分子层化学吸附，颗粒内扩散模型表明吸附过程中存在内部扩散行为。二氧化硅气凝胶对铅（II）表现出特定的吸附行为。这项研究为煤矸石的再利用提供了一个前景广阔的途径，同时解决了受铅（II）污染的废水问题。

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来源期刊

Water, Air, & Soil Pollution 环境科学-环境科学

CiteScore

4.50

自引率

6.90%

发文量

448

审稿时长

2.6 months

期刊介绍： Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.