CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Mingqi Ding,Wenjie Ma,Pengju Liu,Jingbo Yang,Keyu Lan,Dawei Xu
Aerogel with vertically aligned porous structure can effectively enhance sunlight absorption and continuously absorb seawater, which is ideal for solar-thermal desalination, but the oriented cell walls lead to rapid heat dissipation, reducing the evaporation efficiency. Herein, the multifunctional aerogels with enhanced thermal insulation property were fabricated through rational assembly of exfoliated Ti 3 C 2 T x nanosheets, polyvinyl alcohol (PVA) and cellulose nanofibrils (CNF). The MXene composite aerogel (MCA) possessed the multiscale structure with parallel PVA/Ti 3 C 2 T x cell walls served as the skeleton and cross-linked CNF filled in the aligned pores, which is responsible for the superior hydrophilicity, thermal insulation (56.54 mWm - 1 K - 1 ) and solar absorption (97.9 %), suggesting high solar-thermal evaporation efficiency. Consequently, under exposure to 10 h natural sunlight irradiation, the maximum evaporation rate and efficiency of MCA reached 1.13 kgm - 2 h - 1 and 82.93 %, respectively. Moreover, the swelling of polymers with dipped water causes the structure change and conductivity variation of MCA, which can monitor the changing humidity by the generation of water-induced electrical signal, showing great prospects in solar-thermal desalination and intelligent detection fields.
研究领域:
材料科学
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能源工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Jun Liu,Bin Yuan,Ge Bai,Hui Wang,Zhi-Wei He,Wen-Yao Zhu,Meng-Jie Chang
Due to the great size difference and poor interfacial compatibility, the traditional fiber reinforced aerogel composites mainly exist in form of particles deposited on the filled fibers with insufficient mechanical property. In this work, A novel compressive silica aerogel (SNAG) with electrospun SiO 2 nanofibers (SNFs) as reinforcement was facilely established via a simple acid/base catalyzed two-step method under ambient pressure drying. The obtained SNAG is organized with unique fibrous core/shell skeletons to acquire excellent properties of low density, hydrophobicity, strong mechanical and effective insulation. The SNAG has a sorption capacity of 10.3 g g −1 for CH 2 Cl 2 and can be repeatedly used through rapid compression and springback with a compressive ratio of 65%. The mechanical strength of the SNAG with 0.6 wt% SNFs can reach up to 0.23 MPa, which is 4.9 times higher than that of pure silica aerogel without addition of SNFs. Moreover, SNAG has been successfully employed as insulator for interfacial solar thermal evaporation with an evaporation rate of 1.31 kg m −2 h −1 to produce fresh water. It is believed that the obtained SNAG would be a prospective elastic aerogel for various applications and bring new insights into designing high-strengthen aerogels.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2022
·Vol. 4
·期 1
·223-230
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IF 0
Sihan Tang,Xinyue Lu,Peng Geng,Daobing Chen,Yunsong Shi,Jin Su,Yan Zhou,Bin Su,Shifeng Wen
Polymers possessing highly adjustable physicochemical properties have been accepted as ideal flexible materials for solar thermal evaporation, which is considered as an eco-friendly and progressive strategy for water reclamation. Conventional dual-network polymers based on the construction of covalent and non-covalent interactions usually involve toxic reactive monomers, initiators and organic solvents in 3D printing. The integration of additive manufacturing into the construction of supramolecular non-covalent dual-networks to achieve structural and performance optimisation remains a noteworthy part. Here we developed a 3D-printed anti-swelling polyelectrolyte evaporator consisting of k-carrageenan (CG), poly(diallyldimethylammoniumchloride) (PDADMAC), and carbon nanotubes (CNTs). CG-PDADMAC-CNT (CGP-CNT) was constructed by non-covalent supramolecular interactions (hydrogen bonds and electrostatic complexation). The exhibited “sol–gel” transition based on thermo reversible hydrogen bonds and helical structure reconfiguration facilitated three-dimensional shaping, while strong electrostatic complexation stabilized the evaporator structure. As a proof-of-concept, the 3D-printed evaporator was intrinsically antibacterial and exhibited remarkable swelling resistance (water bath at 100 °C for 14 days, pH = 13) to a harsh water environment and stable solar thermal evaporation (2.3 kg m−2 h) under 1 sun irradiation, which was one of the prominent values among the evaporators prepared by direct-ink-writing (DIW).
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
Nature Communications
·
2022
·Vol. 13
·期 1
·1-8
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IF 17.694
Tang Sihan,Gong Jiang,Shi Yunsong,Wen Shifeng,Zhao Qiang
Stable interfaces between immiscible solvents are crucial for chemical synthesis and assembly, but interfaces between miscible solvents have been less explored. Here the authors report the spontaneous water-on-water spreading and self-assembly of polyelectrolyte membranes. An aqueous mixture solution containing poly(ethyleneimine) and poly(sodium 4-styrenesulfonate) spreads efficiently on acidic water, leading to the formation of hierarchically porous membranes. The reduced surface tension of the polyelectrolyte mixture solution drives the surface spreading, while the interfacial polyelectrolytes complexation triggered by the low pH of water mitigates water-in-water mixing. The synergy of surface tension and pH-dependent complexation represents a generic mechanism governing interfaces between miscible solvents for materials engineering, without the need for surfactants or sophisticated equipment. As a proof-of-concept, porous polyelectrolyte hybrid membranes are prepared by surface spreading, exhibiting exceptional solar thermal evaporation performance (2.8 kg/m 2 h) under 1-sun irradiation.
研究领域:
材料科学
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化学工程
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表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
·
IF 10.9
Rui-Jie Pan,Jing Wu,Jin Qu,Tingting Zhang,Fan-Zhen Jiao,Mang Zhao,Meng-Yan Han,Xiaofeng Li,Zhong-Zhen Yu
Catalytic CoFe 2 O 4 and solar-thermal carbon nanotube decorated bamboo fabrics (CCBF) are fabricated for integrating efficient solar steam generation from wastewater with catalytic degradation of its organic contaminants. Thanks to the numerous porous channels and polar groups of bamboo fabric and the efficient solar-thermal energy conversion of black carbon nanotubes, the porous and hydrophilic CCBF exhibits fast upward transport of water, efficient solar light absorption, and high solar-thermal energy conversion efficiency. The decorated CoFe 2 O 4 not only enhances the solar-thermal energy conversion efficiency of CCBF but also activates potassium peroxymonosulfate to generate abundant highly active species for catalytic degradation of bisphenol A (BPA). Furthermore, folding the CCBF into a peak-like 3D evaporator can enhance solar energy utilization, and gain environmental energy for promoting solar-thermal water evaporation and catalytic degradation performances. The 3D CCBF evaporator achieves a water evaporation rate of 2.72 kg m –2 h –1 under 1-sun irradiation. Meanwhile, 100% of the BPA in the seawater can be degraded within 10 min. An exceptional high purification efficiency of 27.72 kg m –2 h –1 is achieved with the 3D evaporator during a long-term treatment of BPA-containing seawater under 1-sun irradiation. This work demonstrates efficient purification of seawater/wastewater with both metal ions and organic pollutants by simultaneous solar-thermal evaporation of water and catalytic degradation of organic pollutants.
研究领域:
环境科学
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材料科学
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化学工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Tingting Zhang,Jin Qu,Jing Wu,Fan-Zhen Jiao,Changjun Li,Fu-Lin Gao,Ji Liu,Zhong-Zhen Yu,Xiaofeng Li
Solar-driven steam generation has emerged as a sustainable technology for addressing freshwater scarcity. However, significant challenges still exist in developing high-performance, multifunctional evaporators that are adept at both efficiently evaporating water and degrading pollutants, primarily because of the trade-offs among functional designs. Here, a self-floating solar evaporator is reported by functionalizing balsa wood with solar-thermal conversion material carbon nanotubes and catalytic manganese dioxide (MnO 2 ) nanoflowers for simultaneous solar evaporation and pollutant degradation. MnO 2 nanoflowers are rich in oxygen vacancies that can effectively activate peroxymonosulfate to generate reactive oxygen species for efficient organic pollutant degradation. A distinctive non-wetted porous interior structure and a precisely targeted water pathway are spontaneously established in the multifunctional evaporator, ensuring fast water supply, thermal insulation, efficient mass transfer, and high buoyancy. The resulting evaporators successfully combine an impressive evaporation rate of 2.74 kg m −2 h −1 , a high pollutant degradation efficiency (98.3% for 100 mg L −1 tetracycline and 97.4% for 200 mg L −1 Methyl orange), and stable self-floating and self-standing capabilities that ensure long-term operation stability even in complex real-world environments. This work provides an approach to design multifunctional solar evaporators, ensuring strong alignment with practical requirements while expanding their potential application scenarios.
研究领域:
材料科学
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环境工程
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可持续能源
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水处理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）