{"title":"环保铜/铝双层氢氧化物纳米吸附剂对腐植酸的高效去除","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":"{\"title\":\"Highly efficient humic acid removal by environment-friendly copper/aluminum double-layer hydroxide nano adsorbents\",\"authors\":\"N. Pourbakhsh, H. Hazrati, S. 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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. 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引用次数: 0
摘要
研究了不同形态的铜/铝双层氢氧化物吸附剂对腐植酸（HA）的高效阳离子吸附剂。通过共沉淀法和水热法合成了吸附剂。XRD分析证实了吸附剂的高结晶度和纳米级晶体尺寸，FTIR分析证实了吸附剂中存在阴离子官能团。EDX分析进一步确定了合成吸附剂的组成。BET分析表明，吸附剂具有较小的表面积和纳米级孔径分布。实验结果表明，在初始浓度为50 mg L−1、片状吸附剂用量为0.02 g L−1、球形吸附剂用量为0.05 g L−1、pH = 4、温度为25℃的条件下，对HA的去除效果最佳。等温线研究表明，Langmuir等温线模型最符合层状和球形吸附剂对HA的吸附实验数据，层状和球形吸附剂的吸附系数分别为R2 >； 0.99。片状和球形吸附剂的最大吸附量分别为277.7 mg g - 1和285.7 mg g - 1。动力学研究表明，两种吸附剂的拟二级动力学模型最适合，R2 > 0.99。最后，回收研究表明，在连续5个吸附-再生循环后，层状和球形吸附剂的效率分别降低了60%和70%，表明它们具有重复使用的潜力。图形抽象
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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