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Geng J, Liang Q, Yu W, Chen W, Lu G, Luo H. Enhanced removal of Cr(VI) from aqueous solutions by polymer-mediated nitrogen-rich reduced graphene oxide. JOURNAL OF HAZARDOUS MATERIALS 2022; 436:129184. [PMID: 35739715 DOI: 10.1016/j.jhazmat.2022.129184] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 05/03/2022] [Accepted: 05/16/2022] [Indexed: 06/15/2023]
Abstract
The efficient removal of heavy metal by rationally designed carbon-based adsorbents is a key challenge in the field of water purification. Herein, we report a nitrogen-enriched lignosulfonate exfoliated graphene oxide (N-LEGO) for hexavalent chromium (Cr(VI)) removal from aqueous solution. The nitrogen content of N-LEGO reached 13.28%, and the ratio of N-bonding configurations (pyri-N:amine-N:pyrro-N:grap-N) was 2.3:1.6:1:2.3. For Cr(VI) with initial concentration of 70 mg L-1 under pH= 2, the residuary concentration after treated by N-LEGO was close to 0.004 mg L-1, which meets the industrial wastewater discharge standard. The Cr(VI) adsorption behavior on N-LEGO can be fitted with the pseudo-second-order kinetics and Freundlich isotherm model well. The adsorption mechanism of Cr(VI) on N-LEGO includes anions electrostatic attraction, reduction and surface chelation. Density functional theory (DFT) simulations showed that N atoms doping was feasible and thermodynamically stable, meanwhile the N-doped system was easier to adsorb Cr2O72- than HCrO4-. The findings of this work can provide a new idea for the development of N-doped carbon-based adsorbents for the removal of highly toxic Cr(VI) from aqueous solutions.
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Affiliation(s)
- Junjie Geng
- School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong 510006, China
| | - Qianwei Liang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong 510641, China.
| | - Wenyi Yu
- School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong 510006, China
| | - Wei Chen
- Chongqing Key Laboratory of Environmental Materials and Remediation Technologies, Chongqing University of Arts and Sciences, Chongqing 402160, China
| | - Guining Lu
- School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong 510006, China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou, Guangdong 510006, China
| | - Hanjin Luo
- School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong 510006, China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou, Guangdong 510006, China.
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Bacha AUR, Nabi I, Zhang L. Mechanisms and the Engineering Approaches for the Degradation of Microplastics. ACS ES&T ENGINEERING 2021; 1:1481-1501. [DOI: 10.1021/acsestengg.1c00216] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2023]
Affiliation(s)
- Aziz-Ur-Rahim Bacha
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, Peoples’ Republic of China
| | - Iqra Nabi
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, Peoples’ Republic of China
| | - Liwu Zhang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, Peoples’ Republic of China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, Peoples’ Republic of China
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Xochitl QP, María del Consuelo HB, María del Consuelo MS, Rosa María EV, Alethia VM. Degradation of Plastics in Simulated Landfill Conditions. Polymers (Basel) 2021; 13:polym13071014. [PMID: 33805998 PMCID: PMC8037001 DOI: 10.3390/polym13071014] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 03/19/2021] [Accepted: 03/22/2021] [Indexed: 12/26/2022] Open
Abstract
Different degradable plastics have been promoted as a solution for the accumulation of waste in landfills and the natural environment; in Mexico, the most popular options are oxo-degradable, which degrade in a sequential abiotic–biotic process, and compostable plastics. In this research, high-density polyethylene, oxo-degradable high-density polyethylene, and certified compostable plastic were exposed to simulated landfill conditions in an 854-day-long experiment to assess their degradation. High-density polyethylene showed limited degradation, due mainly to surface erosion, evidenced by a 13% decrease in elongation at break. The pro-oxidant additive in the oxo-degradable plastic increased this loss of mechanical properties to 27%. However, both plastic films kept their physical integrity and high molecular weight by the end of the experiment, evidencing degradation but no biodegradation. While the compostable film fragmented, had a lower molecular weight at the end of the experiment, and decreased the presence of C=O bonds, this degradation took place remarkably slower than expected from a composting process. Results show that oxo-degradable and compostable plastics will not biodegrade readily in landfills. This fact should be known and understood for decision-makers to match the characteristics of the materials to the features of the waste management systems.
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Affiliation(s)
- Quecholac-Piña Xochitl
- Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico S/N Col. Agrícola Bellavista, Metepec, Edo de México C.P. 52149, Mexico; (Q.-P.X.); (H.-B.M.d.C.)
| | - Hernández-Berriel María del Consuelo
- Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico S/N Col. Agrícola Bellavista, Metepec, Edo de México C.P. 52149, Mexico; (Q.-P.X.); (H.-B.M.d.C.)
| | - Mañón-Salas María del Consuelo
- Sociedad Mexicana de Ciencia y Tecnología Aplicada a Residuos Sólidos, A. C., Priv. Molcajete 44 Fracc. Hacienda de las Fuentes, Calimaya C.P. 52227, Mexico;
| | - Espinosa-Valdemar Rosa María
- Departamento de Energía, Unidad Azcapotzalco, Universidad Autónoma Metropolitana, Av. San Pablo 180, Col. Reynosa Tamaulipas, Azcapotzalco, Ciudad de México C.P. 02200, Mexico;
| | - Vázquez-Morillas Alethia
- Departamento de Energía, Unidad Azcapotzalco, Universidad Autónoma Metropolitana, Av. San Pablo 180, Col. Reynosa Tamaulipas, Azcapotzalco, Ciudad de México C.P. 02200, Mexico;
- Correspondence: ; Tel.: +52-55-53198-9057
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Quecholac-Piña X, Hernández-Berriel MDC, Mañón-Salas MDC, Espinosa-Valdemar RM, Vázquez-Morillas A. Degradation of Plastics under Anaerobic Conditions: A Short Review. Polymers (Basel) 2020; 12:E109. [PMID: 31948016 PMCID: PMC7023122 DOI: 10.3390/polym12010109] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 12/22/2019] [Accepted: 12/23/2019] [Indexed: 11/17/2022] Open
Abstract
Plastic waste is an issue of global concern because of the environmental impact of its accumulation in waste management systems and ecosystems. Biodegradability was proposed as a solution to overcome this problem; however, most biodegradable plastics were designed to degrade under aerobic conditions, ideally fulfilled in a composting plant. These new plastics could arrive to anaerobic environments, purposely or frequently, because of their mismanagement at the end of their useful life. This review analyzes the behavior of biodegradable and conventional plastics under anaerobic conditions, specifically in anaerobic digestion systems and landfills. A review was performed in order to identify: (a) the environmental conditions found in anaerobic digestion processes and landfills, as well as the mechanisms for degradation in those environments; (b) the experimental methods used for the assessment of biodegradation in anaerobic conditions; and (c) the extent of the biodegradation process for different plastics. Results show a remarkable variability of the biodegradation rate depending on the type of plastic and experimental conditions, with clearly better performance in anaerobic digestion systems, where temperature, water content, and inoculum are strictly controlled. The majority of the studied plastics showed that thermophilic conditions increase degradation. It should not be assumed that plastics designed to be degraded aerobically will biodegrade under anaerobic conditions, and an exact match must be done between the specific plastics and the end of life options that they will face.
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Affiliation(s)
- Xochitl Quecholac-Piña
- Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico s/n. Colonia Agrícola Bellavista Metepec, Edo. De México, México C.P. 52149, Mexico; (X.Q.-P.); (M.d.C.H.-B.)
| | - María del Consuelo Hernández-Berriel
- Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico s/n. Colonia Agrícola Bellavista Metepec, Edo. De México, México C.P. 52149, Mexico; (X.Q.-P.); (M.d.C.H.-B.)
| | - María del Consuelo Mañón-Salas
- Sociedad Mexicana de Ciencia y Tecnología Aplicada a Residuos Sólidos, A.C., Priv Molcajete 44 Fracc. Hacienda de las Fuentes, Calimaya, México C.P. 52227, Mexico;
| | - Rosa María Espinosa-Valdemar
- Universidad Autónoma Metropolitana, Av San Pablo Xalpa 180, Reynosa Tamaulipas, Azcapotzalco, Ciudad de México 02200, Mexico;
| | - Alethia Vázquez-Morillas
- Universidad Autónoma Metropolitana, Av San Pablo Xalpa 180, Reynosa Tamaulipas, Azcapotzalco, Ciudad de México 02200, Mexico;
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Samra KS, Singh R, Singh L. Swift Heavy Ion Irradiated Low-Density Polyethylene: Structural and Optical Investigations. J MACROMOL SCI B 2019. [DOI: 10.1080/00222348.2019.1687139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
| | - Ravinder Singh
- Department of Applied Science, Beant College of Engineering and Technology, Punjab, Batala, India
| | - Lakhwant Singh
- Department of Physics, Guru Nanak Dev University, Punjab, Amritsar, India
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