High‐Efficiency Adsorption Performance of Cobalt Alginate/ Graphene Oxide Aerogel Prepared by Green Method for Methylene Blue. Issue 23 (17th June 2022)

• Record Type: Journal Article
• Authors: Sun, Yaohui; Li, Yanhui; Chen, Bing; Cui, Mingfei; Xu, Wenshuo; Li, Liubo; Wang, Mingzhen; Zhang, Yang; Chen, Kewei; Du, Qiuju; Wang, Yuqi; Pi, Xinxin
• Is Part Of: ChemistrySelect. Volume 7:Issue 23(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-17
• Subjects: Adsorption -- Aerogel -- Cobalt alginate -- Graphene oxide -- Thermodynamics; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202201216
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: In this paper, cobalt alginate/graphene oxide (CA/GO) aerogel composites were prepared by wet spinning and vacuum freezing. The cobalt ion only ion‐pairs with the carboxyl ion in the alginate, and other groups such as hydroxyl were not combined with cobalt ions, generating free hydroxyl, and thus improving the adsorption performance and recyclability of the composite material. The adsorption properties of CA/GO aerogels gradually improved with the increase of pH. The maximum adsorption capacity of CA/GO aerogel at 298 K was 294.18 mg.g −1, and the adsorption process of methylene blue (MB) on CA/GO aerogel conformed to Langmuir isotherm model and pseudo‐second‐order model. The adsorption of MB on CA/GO is mainly attributed to electrostatic attraction, hydrogen bonding and π‐π interaction. Thermodynamic analysis showed that the adsorption process was both spontaneous and exothermic. After the CA/GO aerogel was reused for 5 times, the removal rate reached as high as 80.256 %. Compared with other adsorbents, the prepared adsorbent was proven to be provided with good removal capacity for MB, and expected to be widely applied to the adsorption treatment of MB wastewater. Abstract : Taking sodium alginate and graphene oxide as raw materials, aerogels were successfully prepared using the wet spinning and vacuum freeze‐drying method. The composite presents excellent adsorption performance for 100 mg.L −1 methylene blue solution at room temperature. The maximum adsorption capacity of CA/GO is calculated to be 294.18 mg.g −1 following the Langmuir thermodynamic model. The adsorption kinetics of methylene blue on the aerogel is proven to conform to the pseudo‐second‐order kinetic equation, and the composite material can be reused many times.