ENERGY & FUELS
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2024
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IF 5.2
Yun Feng,Xiaosen Li,Zhaoyang Chen,Hongfei Ji,Changyu You,Hao Peng
Excessive water production impacted marine natural gas hydrate production. Cationic polyacrylamide (CPAM), one kind of chemical reagent, was used for the first time to selectively reduce water production while having less impact on gas production. After quartz sands with an absolute permeability of 100–1000 mD were treated with CPAM, the water phase permeability was reduced to 1/15, while the gas phase permeability almost had no change. Furthermore, CPAM was effective in controlling water flow in quartz sands with an absolute permeability range of 100–1000 mD. The water phase permeability initially decreased and then stabilized as the concentration of CPAM increased from 500 to 20,000 ppm. Additionally, the formation of methane hydrate in pretreated quartz sands with CPAM led to a greater reduction in quartz sands’ permeability than the sum of the respective reduction for CPAM treatment and methane hydrate formation. In addition, compared to quartz sands treated only with CPAM, the dissociation of 5% methane hydrate significantly increased the permeability of CPAM-treated quartz sands, but the permeability was smaller than that before CPAM treatment.
研究领域:
地质学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yuxuan He,Yihang Zhang,Bocheng Xiang,Changhui Fu,Huayang Zhang,Danyan Zhan,Zhiguang Guo
Hygroscopic salt hydrogel photothermal composites and related technology are a promising pathway for water harvesting. However, due to the overly cumbersome preparation process, the distribution of the surface photothermal layer is difficult to control and the photothermal efficiency is low. In this paper, a method is proposed to greatly simplify the preparation process of photothermal layer hydrogels and improve their atmospheric water harvesting performance by constructing temperature-sensitive interpenetrating networks. Due to the decomposition of some reversible hydrated structures in the network during heating and warming, carbon nanotubes move autonomously to form a layered structure with a photothermal effect on the upper surface, which can return to its original state after cooling and remain stable at room temperature or under solar illumination. Compared with hydrogels with general layered structure or overall distribution of photothermal materials, agar/GG/PAM/CNT hydrogel has faster moisture adsorption efficiency and higher desorption efficiency, and during the 24 h continuous sorption–desorption cycle is capable of achieving high water yield of 2.57 L water kg sorbents −1 day −1 , superior to most recent hydrogel adsorbents. Simplifying the preparation process while maintaining high efficiency, while greatly improving photothermal performance, paves the way for cost-effective mass production applications for a wide range of hygroscopic salt-hydrogel photothermal composites.
研究领域:
材料科学
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环境科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2018
·
IF 4.374
Wei An,Lu Chen,Tao Liu,Yao Qin
In present work, an enhanced solar distillation system that combined a concentrating optical engineering and nanofluid-based spectral splitting PV/T technique is proposed to overcome the drawbacks of conventional solar distillation system. In such a system, gold and silver nanoparticles with selectively spectral absorption are added into water to absorb solar radiation that can’t be efficiently utilized by PV cells, and convert them into heat. The rest of solar radiation through nanofluid is converted into electricity to provide power to a fan, which is used to transport steam to an external condenser. The optical performance of the concentrated distiller is investigated by a simulation and experimental test. The optical and thermal properties of gold and silver nanoparticles are characterized, and the mean absorptivity and transmittance of the nanofluids are calculated and compared with pure water. The experimental results confirmed the improvement of nanofluid-based spectral splitting PV/T technique to solar distillation. In comparison with a conventional system, the water yield of the enhanced systems with gold and silver nanoparticles of mere 26 ppm concentration increase by 79.9% and 69.4%, respectively. The thermal efficiency of the enhanced systems with gold and silver nanoparticles also increase by 6.8% and 4.8%, respectively. Such a performance is mainly owing to two effects in the enhanced system. On the one hand, nanoparticles promote the absorption of water to solar energy, and then raise the temperature of water in the evaporator. On the other hand, the use of an external condenser in the enhanced system not only enhances the condensation of steam, but also improves the transmittance of distiller cover. Moreover, gold nanoparticle has more obvious improvement to water productivity than silver nanoparticle, but the PV efficiency of the enhanced system with gold nanofluid is lower than that of silver nanofluid. Therefore, the spectral characteristics of nanofluid have a significant influence for the performance of the enhanced distillation system.
研究领域:
可再生能源
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太阳能工程
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纳米技术
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热能工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2023
·
IF 8
Shan-Jiang Wang,Dan Su,Huan-Li Zhou,Xi Yan,Xiao-Yang Zhang,Tong Zhang
In this work, a flexible Janus composites membrane fabricated by large-scale electrospinning, a rapid plasma etching process, and reproducible surface modification is proposed for stable and efficient solar desalination. The upper hydrophobic plasmonic absorbers are used for effective solar absorption while the bottom hydrophilic polymer layer is for water supply and salt resistant. The heat stability and cycle tests demonstrate their superior performance for steam generation (energy conversion efficiency with 76.06% under 6 sun and stable water output with 7.533 kg m −2 h −1 ). Such Janus membrane provides an alternative way for direct solar desalination, which is achieved by a scalable and cost-effective process.
研究领域:
材料科学
·
纳米技术
·
太阳能
·
环境工程
✓ 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）