1
|
Wang K, Sun Z, Guo W, Chen M, Zhu C, Fei J, Liu Y, He H, Cao Y, Bao X. Upgrading Waste Polylactide via Catalyst-Controlled Tandem Hydrolysis-Oxidation. CHEMSUSCHEM 2023; 16:e202301128. [PMID: 37793185 DOI: 10.1002/cssc.202301128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 08/22/2023] [Indexed: 10/06/2023]
Abstract
As plastic waste pollution continues to pose significant challenges to our environment, it is crucial to develop eco-friendly processes that can transform plastic waste into valuable chemical products in line with the principles of green chemistry. One major challenge is breaking down plastic waste into economically valuable carbon resources. This however presents an opportunity for sustainable circular economies. In this regard, a flexible approach is presented that involves the use of supported-metal catalysts to selectively degrade polylactide waste using molecular oxygen. This protocol has several advantages, including its operation under organic solvent-free and mild conditions, simplicity of implementation, and high atom efficiency, resulting in minimal waste. This approach enables the chemical upcycling of polylactide waste into valuable chemicals such as pyruvic acid, acetic acid, or a mixture containing equimolar amounts of acetic acid and formaldehyde, providing a viable alternative for accessing key value-added feedstocks from waste and spent plastics.
Collapse
Affiliation(s)
- Kaizhi Wang
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, China
| | - Zehui Sun
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, China
| | - Wendi Guo
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, China
| | - Mugeng Chen
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, China
| | - Conglin Zhu
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, China
| | - Jiachen Fei
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, China
| | - Yongmei Liu
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, China
| | - Heyong He
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, China
| | - Yong Cao
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, China
| | - Xinhe Bao
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023, Dalian, Liaoning, China
| |
Collapse
|
2
|
Xu L, Zhang X, Huang L, Yu J, Si Y, Ding B. Janus Dual Self-Strengthening Structure of Bi 2 O 3 /Gd 2 O 3 Nanofibrous Membranes for Superior X-Ray Shielding. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2303012. [PMID: 37264771 DOI: 10.1002/smll.202303012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/19/2023] [Indexed: 06/03/2023]
Abstract
Bi2 O3 /rare earth oxide biphasic absorbers are attractive for high-efficiency X-ray shielding due to the complementary X-ray absorption effects. However, its application is severely hindered by poor interphasic contact. Here, a new Janus interface engineering strategy is reported for the construction of continuous and flexible Bi2 O3 /Gd2 O3 crystal nanofibrous membranes (FJNMs) with micro/nano dual self-strengthening interphasic adhesion. This strategy facilitates online micro-interlocking between Bi2 O3 /Gd2 O3 nanofibers and in situ nano-grain fusion between Bi2 O3 /Gd2 O3 crystals, significantly enhancing the adhesive strength at the Bi2 O3 /Gd2 O3 interface. Additionally, the synergistic shielding effect from Bi2 O3 /Gd2 O3 absorption and multiple reflections in Bi2 O3 and Gd2 O3 crystal lattices make the nanofibrous membranes a superior X-ray radiation barrier. The FJNMs demonstrate integrated features of exceptional X-ray shielding efficiency (91%-100%), robust interfacial adhesion (lap-shear strength >3.8 MPa), prominent flexibility, lightweight, and outstanding breathability. The design concepts of fibrosing biphasic absorber assemblies pave the way for asymmetrically assembling biphasic materials, setting the stage for a fundamental shift in next-generation radiation shielding materials.
Collapse
Affiliation(s)
- Li Xu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textiles, Donghua University, Shanghai, 201620, China
| | - Xinyu Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textiles, Donghua University, Shanghai, 201620, China
| | - Liqian Huang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textiles, Donghua University, Shanghai, 201620, China
| | - Jianyong Yu
- Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 200051, China
| | - Yang Si
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textiles, Donghua University, Shanghai, 201620, China
- Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 200051, China
| | - Bin Ding
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textiles, Donghua University, Shanghai, 201620, China
- Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 200051, China
| |
Collapse
|
3
|
Zulkifli MZA, Nordin D, Shaari N, Kamarudin SK. Overview of Electrospinning for Tissue Engineering Applications. Polymers (Basel) 2023; 15:polym15112418. [PMID: 37299217 DOI: 10.3390/polym15112418] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 04/24/2023] [Accepted: 05/15/2023] [Indexed: 06/12/2023] Open
Abstract
Tissue engineering (TE) is an emerging field of study that incorporates the principles of biology, medicine, and engineering for designing biological substitutes to maintain, restore, or improve tissue functions with the goal of avoiding organ transplantation. Amongst the various scaffolding techniques, electrospinning is one of the most widely used techniques to synthesise a nanofibrous scaffold. Electrospinning as a potential tissue engineering scaffolding technique has attracted a great deal of interest and has been widely discussed in many studies. The high surface-to-volume ratio of nanofibres, coupled with their ability to fabricate scaffolds that may mimic extracellular matrices, facilitates cell migration, proliferation, adhesion, and differentiation. These are all very desirable properties for TE applications. However, despite its widespread use and distinct advantages, electrospun scaffolds suffer from two major practical limitations: poor cell penetration and poor load-bearing applications. Furthermore, electrospun scaffolds have low mechanical strength. Several solutions have been offered by various research groups to overcome these limitations. This review provides an overview of the electrospinning techniques used to synthesise nanofibres for TE applications. In addition, we describe current research on nanofibre fabrication and characterisation, including the main limitations of electrospinning and some possible solutions to overcome these limitations.
Collapse
Affiliation(s)
- Muhammad Zikri Aiman Zulkifli
- Department of Chemical & Process Engineering, Faculty of Engineering & Build Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Darman Nordin
- Department of Chemical & Process Engineering, Faculty of Engineering & Build Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Norazuwana Shaari
- Full Cell Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Siti Kartom Kamarudin
- Full Cell Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| |
Collapse
|