{"title":"Highly efficient humic acid removal by environment-friendly copper/aluminum double-layer hydroxide nano adsorbents","authors":"N. Pourbakhsh, H. Hazrati, S. Gharibian","doi":"10.1007/s13762-025-06377-6","DOIUrl":null,"url":null,"abstract":"<div><p>This study investigates copper/aluminum dual-layer hydroxide adsorbents with distinct morphologies as efficient cationic adsorbents for humic acid (HA) removal. The adsorbents were synthesized through the co-precipitation and hydrothermal methods. XRD analysis confirmed the high crystallinity and nanometric crystal size, while FTIR analysis validated the anion functional groups present in the adsorbents. EDX analysis further confirmed the composition of the synthesized adsorbents. BET analysis indicated a small surface area and nanometric pore size distribution of the adsorbents. Experimental results indicated the 50 mg L<sup>−1</sup> initial concentration, the adsorbent dosage of 0.02 g L<sup>−1</sup> for lamellar adsorbent and 0.05 g L<sup>−1</sup> for spherical adsorbent, pH = 4, and 25 °C temperature were optimal conditions for efficient HA removal. Isotherm studies demonstrated that the Langmuir isotherm model best fitted with experimental HA adsorption data using both lamellar and spherical adsorbents with R<sup>2</sup> > 0.99 for lamellar and spherical adsorbents, respectively. Maximum adsorption capacities were determined to be 277.7 mg g<sup>−1</sup> and 285.7 mg g<sup>−1</sup> for the lamellar and spherical adsorbents, respectively. Moreover, kinetic studies revealed that the pseudo-second-order kinetic model exhibited the best fit for both adsorbents, with R<sup>2</sup> > 0.99. Finally, recovery studies indicated that the lamellar and spherical adsorbents showed a 60% and 70% reduction in efficiency after 5 consecutive cycles of adsorption-regeneration, demonstrating their potential for repeated use.</p><h3>Graphical abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"22 8","pages":"6557 - 6572"},"PeriodicalIF":3.0000,"publicationDate":"2025-02-17","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/s13762-025-06377-6","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}
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Abstract
This study investigates copper/aluminum dual-layer hydroxide adsorbents with distinct morphologies as efficient cationic adsorbents for humic acid (HA) removal. The adsorbents were synthesized through the co-precipitation and hydrothermal methods. XRD analysis confirmed the high crystallinity and nanometric crystal size, while FTIR analysis validated the anion functional groups present in the adsorbents. EDX analysis further confirmed the composition of the synthesized adsorbents. BET analysis indicated a small surface area and nanometric pore size distribution of the adsorbents. Experimental results indicated the 50 mg L−1 initial concentration, the adsorbent dosage of 0.02 g L−1 for lamellar adsorbent and 0.05 g L−1 for spherical adsorbent, pH = 4, and 25 °C temperature were optimal conditions for efficient HA removal. Isotherm studies demonstrated that the Langmuir isotherm model best fitted with experimental HA adsorption data using both lamellar and spherical adsorbents with R2 > 0.99 for lamellar and spherical adsorbents, respectively. Maximum adsorption capacities were determined to be 277.7 mg g−1 and 285.7 mg g−1 for the lamellar and spherical adsorbents, respectively. Moreover, kinetic studies revealed that the pseudo-second-order kinetic model exhibited the best fit for both adsorbents, with R2 > 0.99. Finally, recovery studies indicated that the lamellar and spherical adsorbents showed a 60% and 70% reduction in efficiency after 5 consecutive cycles of adsorption-regeneration, demonstrating their potential for repeated use.
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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