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Sharma KK, Panwar H, Gupta KK. Isolation and characterization of bio-prospecting gut strains Bacillus safensis CGK192 and Bacillus australimaris CGK221 for plastic (HDPE) degradation. Biotechnol Lett 2024; 46:671-689. [PMID: 38705964 DOI: 10.1007/s10529-024-03486-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 12/20/2023] [Accepted: 03/10/2024] [Indexed: 05/07/2024]
Abstract
The present work reports the application of novel gut strains Bacillus safensis CGK192 (Accession No. OM658336) and Bacillus australimaris CGK221 (Accession No. OM658338) in the biological degradation of synthetic polymer i.e., high-density polyethylene (HDPE). The biodegradation assay based on polymer weight loss was conducted under laboratory conditions for a period of 90 days along with regular evaluation of bacterial biomass in terms of total protein content and viable cells (CFU/cm2). Notably, both strains achieved significant weight reduction for HDPE films without any physical or chemical pretreatment in comparison to control. Hydrophobicity and biosurfactant characterization were also done in order to assess strains ability to form bacterial biofilm over the polymer surface. The post-degradation characterization of HDPE was also performed to confirm degradation using analytical techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Field emission scanning electronic microscopy (FE-SEM) coupled with energy dispersive X-ray (EDX), and Gas chromatography-mass spectrometry (GC-MS). Interestingly strain CGK221 was found to be more efficient in forming biofilm over polymer surface as indicated by lower half-life (i.e., 0.00032 day-1) and higher carbonyl index in comparison to strain CGK192. The findings reflect the ability of our strains to develop biofilm and introduce an oxygenic functional group into the polymer surface, thereby making it more susceptible to degradation.
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Affiliation(s)
- Kamal Kant Sharma
- Department of Botany and Microbiology, Gurukula Kangri (Deemed to be University), Haridwar, Uttarakhand, India
| | - Himalaya Panwar
- Department of Botany and Microbiology, Gurukula Kangri (Deemed to be University), Haridwar, Uttarakhand, India
| | - Kartikey Kumar Gupta
- Department of Botany and Microbiology, Gurukula Kangri (Deemed to be University), Haridwar, Uttarakhand, India.
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Zhao X, Su M, Yu S, Zhang J, Liu X, Qiu K, Yi X, Zhang J, Dou G, Wang M. Surface Modification of Polyimide Aerogel by Thermoplastic Polyurethane for Enhanced Mechanical Strength and Thermal Insulation Performance. ACS APPLIED MATERIALS & INTERFACES 2024; 16:29282-29290. [PMID: 38780962 DOI: 10.1021/acsami.4c05455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
Polyimide (PI) aerogel is a good thermal insulation material with the highest temperature resistance in practical application. But the mechanical strength of PI aerogels prepared by freeze-drying or thermoimide methods is weak. In this research, TPU was selected as an aging solution to solve the problem of the low mechanical strength of PI aerogel prepared by the freeze-drying method. Previous work has certified that the coupling of PI and thermoplastic polyurethane (TPU) can enhance the mechanical strength of PI aerogel to a certain extent due to the flexibility of TPU. But excessive TPU will change the PI structure in the cross-linking process and decrease the mechanical strength of the aerogel. Thus, a new kind of PI gel modification method was provided by using TPU as an aging solution, and the mechanical strength of PI aerogel is improved to 3.06 MPa. Furthermore, the shrinkage, specific surface area, waterproof angle, and thermal conductivity all show good performance, thus enabling PI aerogel to be used in many aspects. Specially, the method is simple and can be used to prepare some other high-strength aerogels.
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Affiliation(s)
- Xinfu Zhao
- Shandong Provincial Key Laboratory of Special Silicone-Containing Materials, Advanced Materials Institute, QiLu University of Technology (Shandong Academy of Sciences), Jinan 250014, P. R. China
| | - Mengqing Su
- Shandong Provincial Key Laboratory of Special Silicone-Containing Materials, Advanced Materials Institute, QiLu University of Technology (Shandong Academy of Sciences), Jinan 250014, P. R. China
| | - Shimo Yu
- Shandong Provincial Key Laboratory of Special Silicone-Containing Materials, Advanced Materials Institute, QiLu University of Technology (Shandong Academy of Sciences), Jinan 250014, P. R. China
| | - Jing Zhang
- Shandong Provincial Key Laboratory of Special Silicone-Containing Materials, Advanced Materials Institute, QiLu University of Technology (Shandong Academy of Sciences), Jinan 250014, P. R. China
| | - Xiaochan Liu
- Shandong Provincial Key Laboratory of Special Silicone-Containing Materials, Advanced Materials Institute, QiLu University of Technology (Shandong Academy of Sciences), Jinan 250014, P. R. China
| | - Kang Qiu
- Shandong Provincial Key Laboratory of Special Silicone-Containing Materials, Advanced Materials Institute, QiLu University of Technology (Shandong Academy of Sciences), Jinan 250014, P. R. China
| | - Xibin Yi
- Shandong Provincial Key Laboratory of Special Silicone-Containing Materials, Advanced Materials Institute, QiLu University of Technology (Shandong Academy of Sciences), Jinan 250014, P. R. China
| | - Jian Zhang
- Shandong Copolymer Silicone Technology Research Institute, Weifang 261000, P. R. China
| | - Guoliang Dou
- Shandong Copolymer Silicone Technology Research Institute, Weifang 261000, P. R. China
| | - Mengdi Wang
- Shandong Copolymer Silicone Technology Research Institute, Weifang 261000, P. R. China
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Amendment the physicochemical properties of polycarbonate/polybutylene terephthalate blend by gamma-ray irradiation doses. Polym Bull (Berl) 2020. [DOI: 10.1007/s00289-020-03474-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Effects of gamma irradiation on 3D-printed polylactic acid (PLA) and high-density polyethylene (HDPE). Polym Bull (Berl) 2020. [DOI: 10.1007/s00289-020-03349-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Ariza-Tarazona MC, Villarreal-Chiu JF, Hernández-López JM, Rivera De la Rosa J, Barbieri V, Siligardi C, Cedillo-González EI. Microplastic pollution reduction by a carbon and nitrogen-doped TiO 2: Effect of pH and temperature in the photocatalytic degradation process. JOURNAL OF HAZARDOUS MATERIALS 2020; 395:122632. [PMID: 32315794 DOI: 10.1016/j.jhazmat.2020.122632] [Citation(s) in RCA: 117] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 03/20/2020] [Accepted: 03/31/2020] [Indexed: 05/06/2023]
Abstract
Microplastics (MPs) are pollutants formed by plastics ≤ 5 mm and are present in marine and terrestrial environments. Due to their large surface to volume ratio and chemical surface properties, MPs adsorb hazardous chemicals from their surrounding environment. When MPs are consumed by fauna, they transfer those substances through the trophic chain. An essential issue of MPs is their disposal. Due to their size, the disposal methods commonly used for plastic items are not suited for MPs. Here, photocatalysis in an aqueous medium is proposed as an alternative to fight MPs pollution. Although the photocatalysis of MPs has been reported, the effect of operating variables in the process has not been investigated. To fill this gap, the impact of pH and temperature on the degradation process of HDPE MPs was investigated using C,N-TiO2 and visible light. Degradation was followed by mass loss, carbonyl index calculation and microscopy. It was found that photocatalysis at low temperature (0 °C) increases MPs' surface area by fragmentation, and low pH value (pH 3) favours hydroperoxide formation during photooxidation. By using the design of experiments tool, it was demonstrated that there is a combined effect of pH and temperature in the photocatalysis of HDPE MPs.
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Affiliation(s)
- Maria Camila Ariza-Tarazona
- Universidad Autónoma de Nuevo León, UANL, Facultad de Ciencias Químicas. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, C.P. 66455, Nuevo León, México
| | - Juan Francisco Villarreal-Chiu
- Universidad Autónoma de Nuevo León, UANL, Facultad de Ciencias Químicas. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, C.P. 66455, Nuevo León, México; Centro de Investigación en Biotecnología y Nanotecnología (CIByN), Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León. Parque de Investigación e Innovación Tecnológica, Km. 10 autopista al Aeropuerto Internacional Mariano Escobedo, Apodaca, 66629, Nuevo León, México
| | - Juan Manuel Hernández-López
- Universidad Autónoma de Nuevo León, UANL, Facultad de Ciencias Químicas. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, C.P. 66455, Nuevo León, México
| | - Javier Rivera De la Rosa
- Universidad Autónoma de Nuevo León, UANL, Facultad de Ciencias Químicas. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, C.P. 66455, Nuevo León, México
| | - Virginia Barbieri
- Università degli Studi di Modena e Reggio Emilia, Dipartimento di Ingegneria "Enzo Ferrari", Via P. Vivarelli 10/1, 41125, Italy
| | - Cristina Siligardi
- Università degli Studi di Modena e Reggio Emilia, Dipartimento di Ingegneria "Enzo Ferrari", Via P. Vivarelli 10/1, 41125, Italy
| | - Erika Iveth Cedillo-González
- Universidad Autónoma de Nuevo León, UANL, Facultad de Ciencias Químicas. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, C.P. 66455, Nuevo León, México.
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Nano-Mechanical Properties of Surface Layers of Polyethylene Modified by Irradiation. MATERIALS 2020; 13:ma13040929. [PMID: 32093045 PMCID: PMC7078636 DOI: 10.3390/ma13040929] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 02/07/2020] [Accepted: 02/14/2020] [Indexed: 11/17/2022]
Abstract
This study’s goal was to describe the influence of a wide range of ionizing beta radiation upon the changes in surface layer mechanical properties and structural modifications of selected types of polymer. Radiation crosslinking is a process whereby the impingement of high-energy electrons adjusts test sample structures, thus enhancing the useful properties of the material, e.g., hardness, wear-resistance, and creep, in order that they may function properly during their technical use. The selected polymers tested were polyolefin polymers like polyethylene (Low-density polyethylene LDPE, High-density polyethylene HDPE). These samples underwent exposure to electron radiation of differing dosages (33, 66, 99, 132, 165, and 198 kGy). After the crosslinking process, the samples underwent testing of the nano-mechanical properties of their surface layers. This was done by means of a state-of-the-art indentation technique, i.e., depth-sensing indentation (DSI), which detects the immediate change in the indentation depth associated with the applied force. Indeed, the results indicated that the optimal radiation dosage increased the mechanical properties by up to 57%; however, the beneficial levels of radiation varied with each material. Furthermore, these modifications faced examination from the structural perspective. For this purpose, a gel test, Raman spectroscopy, and crystalline portion determination by X-ray all confirmed the assumed trends.
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Mehmood MS, Thira I, Idris A, Yasin T, Ikram M. UHMWPE band-gap properties -II: Effect of post e-beam irradiation real time shelf aging in air. Radiat Phys Chem Oxf Engl 1993 2019. [DOI: 10.1016/j.radphyschem.2019.02.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Lafleur SSD, Shen L, Kamphuis EJTW, Houben SJA, Balzano L, Severn JR, Schenning APHJ, Bastiaansen CWM. Optical Patterns on Drawn Polyethylene by Direct Laser Writing. Macromol Rapid Commun 2019; 40:e1800811. [DOI: 10.1002/marc.201800811] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 01/04/2019] [Indexed: 11/09/2022]
Affiliation(s)
- Sarah S. D. Lafleur
- Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Lihua Shen
- Department of Mechanical EngineeringUniversity of Colorado Boulder CO 80309 USA
| | | | - Simon J. A. Houben
- Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands
| | | | | | | | - Cees W. M. Bastiaansen
- Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands
- Queen MaryUniversity of London London E1 4NS UK
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The effect of gamma-irradiation on morphology and properties of melt-spun poly (lactic acid)/cellulose fibers. Polym Degrad Stab 2019. [DOI: 10.1016/j.polymdegradstab.2018.11.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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