H. Hiep, V. Q. Huy, D. S. Duc, L. Belhacova, D. V. Quang
{"title":"Floatable lightweight concrete modified with GO/SiO2 hybrid coating for enhanced methylene blue adsorption","authors":"H. Hiep, V. Q. Huy, D. S. Duc, L. Belhacova, D. V. Quang","doi":"10.1007/s13762-026-07465-x","DOIUrl":null,"url":null,"abstract":"<div><p>In this study, a novel floating adsorbent was fabricated by coating lightweight polystyrene-based concrete with functional SiO<sub>2</sub> and graphene oxide (GO)-modified SiO<sub>2</sub> layers. The successful deposition of the SiO<sub>2</sub> and GO/SiO<sub>2</sub> layers on lightweight concrete was indicated by SEM and FT-IR characterization, while BET measurements showed an almost twofold increase in specific surface area compared with the bare concrete support. The kinetic study using methylene blue as a model pollutant showed that the adsorption kinetics followed a pseudo-second-order model. The adsorption capacity increased from 0.035 mg/cm<sup>2</sup> for the unmodified support to 0.073 mg/cm<sup>2</sup> after GO/SiO<sub>2</sub> coating. The equilibrium adsorption data were best described by the Langmuir model, with a maximum adsorption capacity of 0.236 mg/cm<sup>2</sup>. The influence of pH and temperature on adsorption capacity was also investigated, suggesting that the presence of GO enhances surface interactions and provides more robust adsorption sites than the SiO<sub>2</sub> coating alone. The reusability study showed that the GO/SiO<sub>2</sub>-coated sample retained 83.0% of its original adsorption capacity after three adsorption–desorption cycles. These results indicate that GO/SiO<sub>2</sub> coating on lightweight concrete is a promising method for fabricating floatable adsorbents with significantly improved performance, providing a scalable, sustainable, and easily recoverable solution for the removal of organic pollutants from open water systems.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"23 10","pages":""},"PeriodicalIF":3.4000,"publicationDate":"2026-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Environmental Science and Technology","FirstCategoryId":"93","ListUrlMain":"https://link.springer.com/article/10.1007/s13762-026-07465-x","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
In this study, a novel floating adsorbent was fabricated by coating lightweight polystyrene-based concrete with functional SiO2 and graphene oxide (GO)-modified SiO2 layers. The successful deposition of the SiO2 and GO/SiO2 layers on lightweight concrete was indicated by SEM and FT-IR characterization, while BET measurements showed an almost twofold increase in specific surface area compared with the bare concrete support. The kinetic study using methylene blue as a model pollutant showed that the adsorption kinetics followed a pseudo-second-order model. The adsorption capacity increased from 0.035 mg/cm2 for the unmodified support to 0.073 mg/cm2 after GO/SiO2 coating. The equilibrium adsorption data were best described by the Langmuir model, with a maximum adsorption capacity of 0.236 mg/cm2. The influence of pH and temperature on adsorption capacity was also investigated, suggesting that the presence of GO enhances surface interactions and provides more robust adsorption sites than the SiO2 coating alone. The reusability study showed that the GO/SiO2-coated sample retained 83.0% of its original adsorption capacity after three adsorption–desorption cycles. These results indicate that GO/SiO2 coating on lightweight concrete is a promising method for fabricating floatable adsorbents with significantly improved performance, providing a scalable, sustainable, and easily recoverable solution for the removal of organic pollutants from open water systems.
期刊介绍：
International Journal of Environmental Science and Technology (IJEST) is an international scholarly refereed research journal which aims to promote the theory and practice of environmental science and technology, innovation, engineering and management.
A broad outline of the journal''s scope includes: peer reviewed original research articles, case and technical reports, reviews and analyses papers, short communications and notes to the editor, in interdisciplinary information on the practice and status of research in environmental science and technology, both natural and man made.
The main aspects of research areas include, but are not exclusive to; environmental chemistry and biology, environments pollution control and abatement technology, transport and fate of pollutants in the environment, concentrations and dispersion of wastes in air, water, and soil, point and non-point sources pollution, heavy metals and organic compounds in the environment, atmospheric pollutants and trace gases, solid and hazardous waste management; soil biodegradation and bioremediation of contaminated sites; environmental impact assessment, industrial ecology, ecological and human risk assessment; improved energy management and auditing efficiency and environmental standards and criteria.
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