High-efficiency water purification for methyl orange and lead(II) by eco-friendly magnetic sulfur-doped graphene-like carbon-supported layered double oxide
| Autor: | Shuqi Yu, Yu Chen, Ping Zhang, Tao He, Youqin Zou, Fangfang Qiu, Xuemei Pan, Mingxue Xiang, Huiling Liu, Zhongbang Zhu |
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| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis 0211 other engineering and technologies chemistry.chemical_element Portable water purification 02 engineering and technology 010501 environmental sciences 01 natural sciences Water Purification law.invention Industrial wastewater treatment chemistry.chemical_compound Adsorption law Methyl orange Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences 021110 strategic defence & security studies Graphene Magnetic Phenomena Oxides Pollution Sulfur Carbon Lead Wastewater chemistry Chemical engineering Hydroxide Graphite Azo Compounds Water Pollutants Chemical |
| Zdroj: | Journal of Hazardous Materials. 419:126406 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2021.126406 |
| Popis: | Traditional disposal techniques for the spent layered adsorbents after capturing organics suffer from intractable obstacles, such as resource waste and secondary pollution. To address this diploma, we here developed the “resource-utilization” strategy, i.e., converting the organic layered double hydroxide (as representative) to magnetic sulfur (S)-doped graphene-like carbon-supported layered double oxide (MG/S-LDO) to be reutilized in water purification. The as-prepared MG/S-LDO exhibited outstanding remediation ability toward methyl orange (MO) and lead(II), with the adsorption capacity of 1456 and 656 mg g−1, respectively. Specifically, the residue concentration of Pb2+ was reduced to 0.15 mg L−1 within 1 h, which met the discharge limit of the secondary industrial wastewater. MG/S-LDO could also maintain the preeminent adsorption capability under various interferences (such as wide pH and co-existing ions), even in the authentic water matrices. The removal mechanisms were systematically investigated to unveil that MO removal was dominated by metal-complexation, “memory effect”, and π-π electron donor–acceptor (EDA). While for Pb2+ removal, besides the released OH- from LDO as precipitate agent, the vacancy defect resulting from the S doping played a crucial role in electron interaction between Pb2+ and S-doped graphene. Additionally, the MG/S-LDO was further confirmed as an eco-friendly adsorbent with excellent reusability via the acute toxicity tests using green algae and multiple cycle experiments. This work provides a novel resource-utilization strategy for organic layered wastes to construct the functional eco-friendly materials in wastewater purification realm. |
| Databáze: | OpenAIRE |
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