Synthesis of rice husk-based ion-imprinted polymer for selective capturing Cu(II) from aqueous solution and re-use of its waste material in Glaser coupling reaction
Autor: | Jun-xia Yu, Ru-yi Zhou, Weiyan Yin, Baoyu Gao, Qinyan Yue, Lifeng Yao, Yue Gao, Haifeng He, Zhiyong Xue |
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Rok vydání: | 2021 |
Předmět: |
Green chemistry
Environmental Engineering Aqueous solution Chemistry Polymers Health Toxicology and Mutagenesis Oryza Mesoporous silica Hydrogen-Ion Concentration Pollution Catalysis Kinetics Adsorption Chemical engineering Desorption Environmental Chemistry Glaser coupling Selectivity Waste Management and Disposal Copper Water Pollutants Chemical |
Zdroj: | Journal of hazardous materials. 424 |
ISSN: | 1873-3336 |
Popis: | With the deepening of the concept of recycling economy and green chemistry, selective capture of Cu(II) from wastewater by biosorbent and reuse of the spent Cu(II)-loaded adsorbent are of great significance. Herein, we synthesized composite of rice husk (RH) with mesoporous silica MCM-41 (RH@MCM-41) modified by organosilane containing amino and schiff groups as functional monomer and cross-linking agent. The silica modified RH@MCM-41 was employed as supporter to fabricate copper ion-imprinted polymers as absorbents (named as RM-CIIPs) via surface ion imprinting technique. Adsorption isotherms, kinetics, selectivity and mechanism of RM-CIIPs to remove Cu(II) were investigated with respect to different adsorption condition. Furthermore, we explored the catalytic activity of spent Cu(II)-loaded adsorbent in Glaser coupling reaction. Batch adsorption studies revealed that RM-CIIP-3 prepared with functional monomer shows the best adsorption capacity (91.4 mg/g) for Cu(II), and adsorption equilibrium could be reached within 30 min. RM-CIIP-3 exhibited an excellent selectivity for capturing Cu(II) and reusability in six adsorption/desorption cycles. More importantly, the spent Cu(II)-loaded adsorbent could be used as bio-heterogeneous catalyst and afford the desired product (1,4-diphenylbutadiyne) in 99.1% yield. Our research indicates an eco-friendly systematic strategy to utilize the waste material as an adsorbent for removing heavy metals and catalyst for industry. |
Databáze: | OpenAIRE |
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