Zhuang Liu, Bo Gao, Yuling Li, He Liu, Ali Reza Kamali
{"title":"ZIF-8作为可重复使用的磁性吸附剂,在三维石墨烯上修饰,用于高效去除废水中的孔雀石绿","authors":"Zhuang Liu, Bo Gao, Yuling Li, He Liu, Ali Reza Kamali","doi":"10.1016/j.jallcom.2025.179082","DOIUrl":null,"url":null,"abstract":"Metal-organic frameworks, such as ZIF-8, are well-known for their high dye adsorption performance, but their practical application is limited by difficulties in separating them from solutions, complicating recycling. To overcome this issue, this study introduces a three-dimensional magnetic polydopamine-modified graphene aerogel (MGA) as a support for ZIF-8, enabling easy separation and recycling of the exhausted adsorbent. MGA is synthesized using graphene oxide (GO), dopamine, and iron oxide (Fe<sub>3</sub>O<sub>4</sub>) as raw materials. ZIF-8 crystals are then loaded onto the MGA substrate via an in situ immersion technique, producing a novel ZIF-8 composite aerogel (MZGA). The resulting MZGA exhibits a large specific surface area of 472 m<sup>2</sup>/g and an excellent adsorption capacity for malachite green (MG). The study examines the effects of pH (ranging from 2 to 6), initial dye concentration (from 20 to 1000<!-- --> <!-- -->mg/L), and temperature (25, 35, and 45 ℃) on the MG adsorption performance of MZGA. The results demonstrate that MZGA achieves a maximum adsorption capacity of 6265.6<!-- --> <!-- -->mg/g for MG at an initial MG concentration of 1000<!-- --> <!-- -->mg/L, an adsorbent dose of 10<!-- --> <!-- -->mg, a temperature of 25 °C, and a pH of 4. The adsorption process follows the Langmuir adsorption isotherm and the pseudo-second-order kinetic model, suggesting strong monolayer chemisorption. Detailed surface characterization reveals that the primary mechanisms involved in MG removal by MZGA include pore filling, electrostatic attraction, hydrogen bonding, Lewis acid-base interactions, and π-π interactions. Additionally, MZGA exhibits enhanced magnetic properties (Ms = 39.4<!-- --> <!-- -->emu/g), facilitating the easy removal of the exhausted adsorbent by applying a magnetic field. The recycled MZGA maintains approximately 91% of its initial MG adsorption capacity even after 10 cycles, demonstrating its excellent reusability. MZGA is also tested for the removal of MG from real aqueous environments, including seawater, tap water, and wastewater treatment plant effluent, achieving removal rates exceeding 98%. Thus, MZGA shows significant potential as an efficient adsorbent for removing organic pollutants from wastewater.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"22 1","pages":""},"PeriodicalIF":6.3000,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"ZIF-8 decorated on three-dimensional graphene as reusable magnetic adsorbent for efficient removal of malachite green from wastewater\",\"authors\":\"Zhuang Liu, Bo Gao, Yuling Li, He Liu, Ali Reza Kamali\",\"doi\":\"10.1016/j.jallcom.2025.179082\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Metal-organic frameworks, such as ZIF-8, are well-known for their high dye adsorption performance, but their practical application is limited by difficulties in separating them from solutions, complicating recycling. To overcome this issue, this study introduces a three-dimensional magnetic polydopamine-modified graphene aerogel (MGA) as a support for ZIF-8, enabling easy separation and recycling of the exhausted adsorbent. MGA is synthesized using graphene oxide (GO), dopamine, and iron oxide (Fe<sub>3</sub>O<sub>4</sub>) as raw materials. ZIF-8 crystals are then loaded onto the MGA substrate via an in situ immersion technique, producing a novel ZIF-8 composite aerogel (MZGA). The resulting MZGA exhibits a large specific surface area of 472 m<sup>2</sup>/g and an excellent adsorption capacity for malachite green (MG). The study examines the effects of pH (ranging from 2 to 6), initial dye concentration (from 20 to 1000<!-- --> <!-- -->mg/L), and temperature (25, 35, and 45 ℃) on the MG adsorption performance of MZGA. The results demonstrate that MZGA achieves a maximum adsorption capacity of 6265.6<!-- --> <!-- -->mg/g for MG at an initial MG concentration of 1000<!-- --> <!-- -->mg/L, an adsorbent dose of 10<!-- --> <!-- -->mg, a temperature of 25 °C, and a pH of 4. The adsorption process follows the Langmuir adsorption isotherm and the pseudo-second-order kinetic model, suggesting strong monolayer chemisorption. Detailed surface characterization reveals that the primary mechanisms involved in MG removal by MZGA include pore filling, electrostatic attraction, hydrogen bonding, Lewis acid-base interactions, and π-π interactions. Additionally, MZGA exhibits enhanced magnetic properties (Ms = 39.4<!-- --> <!-- -->emu/g), facilitating the easy removal of the exhausted adsorbent by applying a magnetic field. The recycled MZGA maintains approximately 91% of its initial MG adsorption capacity even after 10 cycles, demonstrating its excellent reusability. MZGA is also tested for the removal of MG from real aqueous environments, including seawater, tap water, and wastewater treatment plant effluent, achieving removal rates exceeding 98%. Thus, MZGA shows significant potential as an efficient adsorbent for removing organic pollutants from wastewater.\",\"PeriodicalId\":344,\"journal\":{\"name\":\"Journal of Alloys and Compounds\",\"volume\":\"22 1\",\"pages\":\"\"},\"PeriodicalIF\":6.3000,\"publicationDate\":\"2025-02-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Alloys and Compounds\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1016/j.jallcom.2025.179082\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Alloys and Compounds","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.jallcom.2025.179082","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
ZIF-8 decorated on three-dimensional graphene as reusable magnetic adsorbent for efficient removal of malachite green from wastewater
Metal-organic frameworks, such as ZIF-8, are well-known for their high dye adsorption performance, but their practical application is limited by difficulties in separating them from solutions, complicating recycling. To overcome this issue, this study introduces a three-dimensional magnetic polydopamine-modified graphene aerogel (MGA) as a support for ZIF-8, enabling easy separation and recycling of the exhausted adsorbent. MGA is synthesized using graphene oxide (GO), dopamine, and iron oxide (Fe3O4) as raw materials. ZIF-8 crystals are then loaded onto the MGA substrate via an in situ immersion technique, producing a novel ZIF-8 composite aerogel (MZGA). The resulting MZGA exhibits a large specific surface area of 472 m2/g and an excellent adsorption capacity for malachite green (MG). The study examines the effects of pH (ranging from 2 to 6), initial dye concentration (from 20 to 1000 mg/L), and temperature (25, 35, and 45 ℃) on the MG adsorption performance of MZGA. The results demonstrate that MZGA achieves a maximum adsorption capacity of 6265.6 mg/g for MG at an initial MG concentration of 1000 mg/L, an adsorbent dose of 10 mg, a temperature of 25 °C, and a pH of 4. The adsorption process follows the Langmuir adsorption isotherm and the pseudo-second-order kinetic model, suggesting strong monolayer chemisorption. Detailed surface characterization reveals that the primary mechanisms involved in MG removal by MZGA include pore filling, electrostatic attraction, hydrogen bonding, Lewis acid-base interactions, and π-π interactions. Additionally, MZGA exhibits enhanced magnetic properties (Ms = 39.4 emu/g), facilitating the easy removal of the exhausted adsorbent by applying a magnetic field. The recycled MZGA maintains approximately 91% of its initial MG adsorption capacity even after 10 cycles, demonstrating its excellent reusability. MZGA is also tested for the removal of MG from real aqueous environments, including seawater, tap water, and wastewater treatment plant effluent, achieving removal rates exceeding 98%. Thus, MZGA shows significant potential as an efficient adsorbent for removing organic pollutants from wastewater.
期刊介绍:
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.