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Su P, He Y, Wang J, Feng Y, Wan Q, Zhang Y, Pang Z. Green separation and decomposition of crystalline silicon photovoltaic module's backsheet by using ethanol. WASTE MANAGEMENT (NEW YORK, N.Y.) 2024; 179:144-153. [PMID: 38471252 DOI: 10.1016/j.wasman.2024.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Revised: 01/11/2024] [Accepted: 03/01/2024] [Indexed: 03/14/2024]
Abstract
The treatment and recycling of discarded crystalline silicon photovoltaic modules (c-Si PV modules) has become a research focus, but few research have paid attention to the standardized treatment of c-Si PV module's fluorinated backsheet. Improper management of fluorinated backsheet can pose ecological and human health risks. Therefore, this study presents a novel method for processing the backsheet. The proposed approach entailed the utilization of ethanol (CH3CH2OH) to separate the backsheet from the PV module. Subsequently, the separated backsheet underwent decomposition using an alkaline ethanol (NaOH-CH3CH2OH) solution. Finally, the backsheet was recovered in the form of terephthalic acid (TPA) with a purity of 97.47 %. This recovered TPA can then serve as a valuable raw material for producing new backsheets, fostering a closed-loop material circulation. Experimental results demonstrate that immersing the PV module in a 75 % CH3CH2OH-H2O solution at a temperature of 343 K for 30 min achieved 100 % separation of the backsheet. Furthermore, subjecting the separated backsheet to a 60 min reaction in an NaOH-CH3CH2OH solution with a temperature of 343 K and a NaOH concentration of 1.0 mol/L achieved complete decomposition. The reaction mechanism was analyzed through characterization methods such as SEM/EDS, NMR, FTIR and XRD. This method is efficient, non-toxic organic reagent-free and environmentally friendly, so it holds significant potential for further development in the field of c-Si PV module recycling.
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Affiliation(s)
- Pengxin Su
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Yaqun He
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.
| | - Jie Wang
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Yi Feng
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Qiuyue Wan
- Department of Environmental Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Yuchen Zhang
- School of Foreign Studies, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Zhibo Pang
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
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Said HA, Ait Bourhim I, Ouarga A, Iraola-Arregui I, Lahcini M, Barroug A, Noukrati H, Ben Youcef H. Sustainable phosphorylated microcrystalline cellulose toward enhanced removal performance of methylene blue. Int J Biol Macromol 2023; 225:1107-1118. [PMID: 36442568 DOI: 10.1016/j.ijbiomac.2022.11.172] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 11/03/2022] [Accepted: 11/17/2022] [Indexed: 11/26/2022]
Abstract
In this study, microcrystalline cellulose (MCC) was phosphorylated using phosphoric acid in the presence of urea and used as an adsorbent for methylene blue (MB) dye removal from an aqueous solution. The obtained products were characterized by different techniques. Batch adsorption experiments were conducted under varying conditions of incubation time, initial MB concentration, pH, and phosphorylation degree. All the samples exhibited similar and fast adsorption kinetics, described by pseudo-second-order model for MB adsorption, whereas the retention capacity depended significantly on the phosphate content and the surface charge of the adsorbents. The experimental adsorption data in the examined MB initial concentrations (0-2000 mg/L) were best suited by the Langmuir isotherm model. The study revealed that the presence of phosphates groups in the cellulose structure significantly enhanced the adsorption of the MB pollutant. The maximum dye removal capacity at pH of 7 was obtained for the phosphorylated microcrystalline cellulose (284.03 mg/g) with a high phosphorylation degree (1.92 % of P), which is 20 times higher than unmodified MCC (15.29 mg/g). This property increased from 284.03 to 328.32 mg/g when increasing the pH from 7 to 11. The MB adsorption mechanism involves hydrogen bonding, electrostatic and ion-dipole interactions. These findings are relevant to a better understanding of the role of cellulose phosphorylation in the recovery of organic dyes from the waste liquid of many industries.
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Affiliation(s)
- H Ait Said
- Mohammed VI Polytechnic University (UM6P), HTMR-Lab, 43150 Benguerir, Morocco
| | - I Ait Bourhim
- Mohammed VI Polytechnic University (UM6P), HTMR-Lab, 43150 Benguerir, Morocco
| | - A Ouarga
- Mohammed VI Polytechnic University (UM6P), HTMR-Lab, 43150 Benguerir, Morocco
| | - I Iraola-Arregui
- Mohammed VI Polytechnic University (UM6P), HTMR-Lab, 43150 Benguerir, Morocco
| | - M Lahcini
- Cadi Ayyad University, Faculty of Sciences and technologies, IMED Lab, 40000 Marrakech, Morocco
| | - A Barroug
- Cadi Ayyad University, Faculty of Sciences Semlalia, SCIMATOP-PIB, 40000 Marrakech, Morocco; Mohammed VI Polytechnic University (UM6P), ISSB-P, 43150 Benguerir, Morocco
| | - H Noukrati
- Mohammed VI Polytechnic University (UM6P), ISSB-P, 43150 Benguerir, Morocco.
| | - H Ben Youcef
- Mohammed VI Polytechnic University (UM6P), HTMR-Lab, 43150 Benguerir, Morocco.
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Cai Y, Yang K, Qiu C, Bi Y, Tian B, Bi X. A Review of Manganese-Oxidizing Bacteria (MnOB): Applications, Future Concerns, and Challenges. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:1272. [PMID: 36674036 PMCID: PMC9859543 DOI: 10.3390/ijerph20021272] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 01/05/2023] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
Groundwater serving as a drinking water resource usually contains manganese ions (Mn2+) that exceed drinking standards. Based on the Mn biogeochemical cycle at the hydrosphere scale, bioprocesses consisting of aeration, biofiltration, and disinfection are well known as a cost-effective and environmentally friendly ecotechnology for removing Mn2+. The design of aeration and biofiltration units, which are critical components, is significantly influenced by coexisting iron and ammonia in groundwater; however, there is no unified standard for optimizing bioprocess operation. In addition to the groundwater purification, it was also found that manganese-oxidizing bacteria (MnOB)-derived biogenic Mn oxides (bioMnOx), a by-product, have a low crystallinity and a relatively high specific surface area; the MnOB supplied with Mn2+ can be developed for contaminated water remediation. As a result, according to previous studies, this paper summarized and provided operational suggestions for the removal of Mn2+ from groundwater. This review also anticipated challenges and future concerns, as well as opportunities for bioMnOx applications. These could improve our understanding of the MnOB group and its practical applications.
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Affiliation(s)
- Yanan Cai
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
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Teixeira YN, de Paula Filho FJ, Bacurau VP, Menezes JMC, Zhong Fan A, Melo RPF. Removal of Methylene Blue from a synthetic effluent by ionic flocculation. Heliyon 2022; 8:e10868. [PMID: 36262293 PMCID: PMC9573891 DOI: 10.1016/j.heliyon.2022.e10868] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 09/08/2022] [Accepted: 09/27/2022] [Indexed: 11/06/2022] Open
Abstract
Methylene Blue (MB) is a dye widely used in the industrial sector and in human and veterinary pharmacology. This dye, if improperly disposed of, can cause a significant environmental impact due to its low biodegradability, as it is a stable and complex substance. Additionally, it may affect human health and generate highly toxic byproducts. Hence, the purpose of this work is to assess the removal efficiency of MB from a synthetic effluent using a ionic flocculation process. Such a process consists of the dissolution of a biodegradable anionic surfactant (obtained from soybean oil used for frying food) in the synthetic effluent and the subsequent addition of calcium to the system. The addition of Ca leads to the formation of insoluble surfactant flocs with a high capacity to adsorb organic pollutants. The FTIR testing showed the presence of OH− and C=O groups in the surfactant flocs, which favor the removal of MB by an adsorption process. The maximum adsorption capacity of MB was 101.38 mg g−1. The process is in fact a chemisorption and has an exothermic nature. Desorption studies showed a desorption efficiency of up to 47.81% using an ethanol 1:2 solution. An MB removal efficiency of up to 93.71% was attained in just 0.5 min for an initial MB concentration of 100 mg L−1, showing that ionic flocculation is a very fast and effective process for the treatment of effluents. Ionic flocculation is a simple, inexpensive and highly efficient process. Biodegradable and sustainable surfactant. Fast and high removal of Methylene Blue (0.5 min–93.71%). Process of exothermic nature.
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Affiliation(s)
- Yago Neco Teixeira
- Agrarian Sciences and Biodiversity Center, Federal University of Cariri, Ícaro Moreira de Sousa St, 126, 63130-025, Crato, Ceará, Brazil,Science and Technology Center, Federal University of Cariri, Av. Ten. Raimundo Rocha, 1639, 63048-080, Juazeiro do Norte, Ceará, Brazil
| | - Francisco José de Paula Filho
- Agrarian Sciences and Biodiversity Center, Federal University of Cariri, Ícaro Moreira de Sousa St, 126, 63130-025, Crato, Ceará, Brazil,Science and Technology Center, Federal University of Cariri, Av. Ten. Raimundo Rocha, 1639, 63048-080, Juazeiro do Norte, Ceará, Brazil,Corresponding author.
| | - Vinícius Pereira Bacurau
- Materials Engineering Department, Federal University of São Carlos, Rod. Washington Luiz, 235, 13565-905, São Carlos, São Paulo, Brazil
| | - Jorge Marcell Coelho Menezes
- Science and Technology Center, Federal University of Cariri, Av. Ten. Raimundo Rocha, 1639, 63048-080, Juazeiro do Norte, Ceará, Brazil
| | - Anderson Zhong Fan
- Materials Engineering Department, Federal University of São Carlos, Rod. Washington Luiz, 235, 13565-905, São Carlos, São Paulo, Brazil
| | - Ricardo Paulo Fonseca Melo
- Exact and Natural Sciences Department, Federal University of Semi-Árido, BR 226, n-n, 59900-000, Pau dos Ferros, Rio Grande do Norte, Brazil
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Li B, Shu J, Wu Y, Su P, Yang Y, Chen M, Liu R, Liu Z. Enhanced removal of Mn2+ and NH4+-N in electrolytic manganese residue leachate by electrochemical and modified phosphate ore flotation tailings. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Liang C, Shi Q, Feng J, Yao J, Huang H, Xie X. Adsorption Behaviors of Cationic Methylene Blue and Anionic Reactive Blue 19 Dyes onto Nano-Carbon Adsorbent Carbonized from Small Precursors. NANOMATERIALS 2022; 12:nano12111814. [PMID: 35683669 PMCID: PMC9182342 DOI: 10.3390/nano12111814] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 05/17/2022] [Accepted: 05/19/2022] [Indexed: 01/27/2023]
Abstract
In this work, an innovative nano-carbon material (N-CM) adsorbent was reported for exploring its adsorption behaviors toward cationic methylene blue (MB) and anionic reactive blue 19 (RB19) pollutants. The proposed N-CM was synthesized by a one-step solvothermal treatment of citric acid and zinc gluconate small precursors. N-CM consists of nanosheets that have an advantageous specific surface area, large sp2/sp3 hybridized domains, and abundant nitrogen/oxygen-containing surface functional groups. The synergistic effects of these features are conducive to the MB and RB19 adsorption. Different from anionic RB19 adsorption (79.54 mg/g) by the cooperative π-π stacking and hydrogen bonding, cationic MB adsorbed onto N-CM mainly by the electrostatic attraction at the natural pH solution (> pHpzc), with an adsorption capacity up to 118.98 mg/g. Interestingly, both MB and RB19 adsorption conformed to the pseudo-second order kinetic (R2 ≥ 0.995) and Langmuir isothermal (R2 ≥ 0.990) models, accompanied by similar maximum monolayer adsorption capacities of 120.77 and 116.01 mg/g, respectively. Their adsorption processes exhibited spontaneously endothermic characteristics. Moreover, N-CM showed superior selective capability toward MB in different mixed dye systems, with high removal efficiencies of 73−89%. These results demonstrate that the high-performance carbon adsorbent prepared from small precursors via low-temperature carbonization shows great potentials in wastewater treatment.
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A template synthesized strategy on bentonite-doped lignin hydrogel spheres for organic dyes removal. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120376] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Adsorption of methylene blue on magnetite humic acid: Kinetic, isotherm, thermodynamic, and regeneration studies. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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