SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ge Gao,Xiaoyi Gao,Bin Xu,Wufeng Jiang,Zhenghong Zhao,Fan Wu,Xiaoshan Li,Cong Luo,Liqi Zhang
The CO 2 phase change absorbents(CPCAs) formed by introducing phase-splitting agents have attracted increasing attention because of their great energy-saving potential. However, the volatilization problem of the phase-splitting agents and the high viscosity of the solution affect the application of CPCAs. In this work, a novel CPCAs based on 2-Methylpiperazine (2MPRZ)/H 2 O was established by introducing triethylene glycol monobutyl ether (TGBE) with a high boiling point as a phase-splitting agent, and the 2MPRZ/H 2 O/TGBE system exhibited low volatility and low viscosity. The CO 2 capture performance of the novel CPCAs with different ratios was investigated in this work. The best CO 2 absorption rate was achieved by 2.5 M 2MPRZ/H 2 O/TGBE. The viscosity of this system before and after the CO 2 absorption process was merely 7.68 mPa·s and 11.64 mPa·s, respectively, and no volatilization of the phase-splitting agent was observed simultaneously. A convenient and rapid titration method was employed to determine the distribution of the 2MPRZ products in the two phases, which showed that 98 % of the 2MPRZ products were located in the CO 2 -rich phase. In addition, the CO 2 -rich phase captured 99 % of the total CO 2 , indicating that this system has superior phase-splitting behaviors. The regeneration energy consumption of this biphasic absorbent was 2.59 GJ/t CO 2 , which was 32.6 % lower than that of traditional MEA. Furthermore, the salting-out effect was proved to be the cause of the phase-splitting behavior by 13 C NMR analysis.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Chuanlin Hu,Yedongyang Liu,Xiong Qian,Yukun Qin,Yemin Dong,Fazhou Wang
The MgO production worldwide is mainly achieved through the calcination of magnesite in the wake of higher energy requirements. This study proposes an energy-saving calcination strategy through low-temperature partially calcining hydromagnesite (4MgCO 3 ·Mg(OH) 2 ·4H 2 O). Furthermore, the feasibility of using the partially calcined hydromagnesite and slag to produce a sustainable cementitious material was investigated by various techniques. This approach requires relatively low temperature and short processing time with a potential energy saving of production and CO 2 emission of fuel combustion. Moreover, it accelerates the hydration rate due to amorphous magnesium carbonate. Results indicated that the amorphous magnesium carbonate is formed during the partial calcination of hydromagnesite. It tends to transform to nesquehonite (MgCO 3 ·3H 2 O) in the initial stage of hydration, which is responsible for promoting early hydration and excellent early compressive strength. Finally, the reaction mechanism of the partially calcined hydromagnesite-based cementitious materials has been established, demonstrating its enormous potential for preparing low-carbon cementitious materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Xiangfei Kong,Baochun Cui,Yongkang Zhao,Jihui Yuan,Jianjuan Yuan,Jiale Chai,Yuliang Zhong,Bowen Xu
The film/coating with dual-mode of photothermal conversion (PC) and radiative cooling (RC) has limited heat storage capacity and cannot achieve continuous heating/cooling. Due to its high heat storage density, phase change material (PCM) can store heat/cold to continuously utilize thermal energy. Hence, this study prepares a novel flexible PCM with dual-mode of with PC and RC. The dual-mode PCM has an extremely high enthalpy of 208.7 J/g, and low thermal conductivity of 0.23 W/(m·K). In PC mode, the solar absorptivity reaches 0.94. In RC mode, the solar reflectance is 0.91, and the emissivity in atmospheric window is 0.92. The comparative experiments of dual-mode PCM and dual-mode melamine foam (MF) film were conducted to demonstrate superiority of radiation heating/cooling combined with PCM. In PC mode, the photothermal conversion efficiency of dual-mode PCM reached 90.5 %, while the photothermal conversion efficiency of dual-mode MF film was only 33.4 %. Moreover, under outdoor heating experiment with cover shield, the dual-mode PCM made its temperature always higher than ambient temperature at night, while the dual-mode MF film cannot. Even if the cover shield was removed, the dual-mode PCM still reduced the energy consumption by 4.0 % compared to the dual-mode MF film. Besides, in RC mode with cover shield, the dual-mode PCM achieved a peak temperature drop of 6.1 °C relative to the dual-mode MF film. In RC mode without cover shield, the dual-mode PCM achieved energy saving of 63.3 % compared with dual-mode MF film. In summary, the dual-mode PCM has more continuous heating/cooling performance than the dual-mode film, thereby achieving more significant energy saving.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Qiuying Wang,Zhiwei Wang,Menghang Qi,Hang Zhao,Xin Xin,Anjali Verma,Theeranun Siritanon,Arthur P. Ramirez,M.A. Subramanian,Peng Jiang
The severe urban heat island effect emphasizes the heightened importance of reducing building energy consumption. Cool pigments with higher near-infrared reflectivity contribute to the overall coating performance of the building. In this work, a novel intense blue pigment with superior infrared reflectance based on Ni-doped Zn2SiO4 was successfully synthesized via the simple solid-state method. The crystal structure, oxidation states, and optical properties are analyzed. The oxidation state of Ni was confirmed to be +2 using magnetic analysis and XPS. The intense blue color exhibited by the solid solution is due to the 3T1(3F) → 3T1(3P) transition of Ni2+ at the tetrahedral sites. UV–vis–NIR spectra demonstrate that this pigment exhibits superior near-infrared reflectance compared to cobalt blue in the range of 900–1700 nm, indicating its potential application in the realm of building energy conservation.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Jiaji Cheng,Yue Zhou,Dan Ma,Shaoxiang Li,Feng Zhang,Yu Guan,Wenjuan Qu,Yang Jin,Dong Wang
The phase change material (PCM) microcapsule is a common high-performance storage technology of thermal energy. However, the organic wall with low thermal conductivity for PCM reduces the efficiency of heat storage and release. In this study, the novel carbon nanotube-doped phase change materials (C-PCMs) were developed. Scanning electron microscope test (SEM), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and the thermogravimetric analysis/infrared spectrometry (TG-IR) were used to analyse the composite structure and thermal performances. The results indicate that C-PCMs are small and regular in spherical shape. When C-PCMs suffer from heat, the shell can maintain integrity below 165 °C. Furthermore, the carbon nanotubes in the shell play as a channel to connect the inside with the outside and improve the efficiency of heat transfer. The DCS test of the samples showed that the latent heat of C-PCMs and PCMs were 112.25 J/g and 116.18 J/g, respectively. The initial phase transition temperature of C-PCMs is 28.97 °C, which is 0.5 °C lower than that of PCMs. The results of the model room test suggested that the composite filled with C-PCMs reduces indoor temperature fluctuations and exhibits the potential for enhancing energy savings and the thermal comfort of buildings.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Processes
·
2019
·Vol. 7
·期 6
·377
·
IF 1.963
Taotao Liang,Xiaogang Guo,Abdulmoseen Segun Giwa,Jianwei Shi,Yujin Li,Yan Wei,Xiaojuan Wang,Xuansong Cao,Xiaofeng Tang,Jialun Du
Methyl methacrylate (MMA) plays a vital role in national productions with broad application. Herein, the production of MMA is realized by the improved eco-friendly direct methylation method using Aspen Plus software. Three novel kinds of energy-saving measures were proposed in this study, including the recycle streams of an aqueous solution, methacrolein (MAL), and methanol, the deployment of double-effect distillation instead of a normal one, and the design of a promising heat-exchange network. Moreover, MMA with a purity of 99.9% is obtained via the design of a MAL absorber column with an optimal stage number of 11 and a facile chloroform recovery process by using the RadFrac model. Thus, the proposed green process with energy-conservation superiority is the vital clue for developing MMA, and provides a reference for the production of MMA-ramifications with excellent prospects.Keywords:MMA;double-effect distillation;energy conservation;MAL;purity
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Bai Yang Zhou,Xi Yan Lin,Kai Wang,Guang Sheng Luo
In this work, we established a cascade cooling and two-step feeding technology for the energy-saving and fast synthesis of polyvinyl butyral (PVB) with a low molecular weight in a microreactor system. Because of the strong mixing capacity of the microreactor and the relatively higher initial reaction temperature of 60 °C compared to existing methods, the condensation reaction between the raw materials of poly(vinyl alcohol) (PVA) and n-butanal was highly intensified and the reaction rate was faster, along with less energy consumption for cooling. By reducing the aging temperature to 40–55 °C, which is far below the glass transition temperature of PVB, we could also lower energy consumption and improve the morphology of PVB. Benefiting from the new technology, the acetalization degree (AD) of PVB reached more than 78%. By applying the two-step n-butanal feeding method in the new technology, the utilization ratio of n-butanal was dramatically increased to more than 99.7%, which was the best result among current published reports. Moreover, a PVB product with a low molecular weight has been successfully prepared with the new technology. This work demonstrates a promising continuous microreaction process for greener and energy-saving synthesis of PVB.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BUILDING AND ENVIRONMENT
·
2022
·
IF 7.093
Qiuxing Lei,Lingling Wang,Huaqing Xie,Wei Yu
Windows are the least energy-saving part of the building envelope. To realize building energy-saving, smart windows have been developed. However, traditional fully passive thermochromic smart windows cannot adjust their transparency according to the complex outdoor climate “intelligently”, and only adjusts the solar radiation, ignoring the indoor temperature increase caused by heat entering the room in the form of convection. Here, we embed poly ( N -isopropylacrylamide) (PNIPAm) microgel into a highly transparent polyacrylamide (PAM) matrix, the PNIPAm-PAM hydrogel exhibits an ultrahigh luminous transmittance of 90.6% and solar modulation of 65.5%. By introducing nanoparticles into thermochromic hydrogels and combining the advantages of fluid glass in heat convection control, we develop a new type of active and passive dual-control smart window (APDC smart window) for the first time. In the indoor demonstration, it is proved that the smart window injected with 1-cm PNIPAm liquid has the best energy-saving ability, and the greenhouse installed with a 1-cm PNIPAm liquid smart window reduces the indoor air temperature by 15 °C compared with normal glass. In the outdoor demonstration, the indoor air temperatures of the APDC smart windows are reduced by ∼14 °C, ∼16 °C, ∼8.5 °C, and ∼9.5 °C respectively in different orientations of east, west, south, and north than normal glass window, and it is reduced by ∼4–8 °C compare with the 1-cm PNIPAm liquid smart window. This opens a new avenue for energy-efficient buildings and greenhouses.
研究领域:
材料科学
·
建筑节能
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2022
·
IF 7.188
Qiaoqi Yu,Min Guo,Wanxuan Xu,Xiaodi Shi,Ying Ma,Jianyong Yu,Bin Ding
Smart windows for adaptive solar modulation have attracted considerable attention because of their broad prospects in energy-saving buildings. Herein, energy-saving smart windows are fabricated by the high-efficiency spray assembly of thermoplasmonic gold nanoparticles (Au NPs). First, the adsorption kinetics of the Au NPs in the spray assembly are investigated based on a pseudo-first-order kinetics equation, which exhibit a spray-pressure dependency. The amount of adsorbed Au NPs after spraying at 30 psi for 20 s is up to ∼80% the saturation adsorption amount, demonstrating the high-speed characteristic of the spray assembly. The spray-assembled Au NP coating, as a solar heating surface, is used to construct smart windows for adaptive solar modulation with the thermochromic poly(N-isopropylacrylamide) hydrogel. The obtained smart window shields 76.6% of the total solar irradiation in the range 300–2500 nm and allows 80.3% of the visible light to enter indoors before optical switching by the hydrogel ensures visual comfort. The cooling performance of the smart window is determined to be ∼13.9 °C by a model house test under a stimulated solar irradiation of 2.8 kW·m −2 (2.8 suns). Moreover, the fabrication method is suitable for flexible substrates to prepare bendable smart windows. This work provides a speed-up fabrication strategy for the large-scale manufacturing of energy-saving smart windows.
研究领域:
材料科学
·
能源工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
R. He,Y. Liao,J. Huang,T. Cheng,X. Zhang,P. Yang,H. Liu,K. Liu
Air-conditioning in buildings is energy intensive and takes up large proportion of global energy consumption. To pursue low energy expenditure, herein, we propose a radiant air-conditioning strategy with infrared transparent and low thermal conductive porous polyethylene aerogels . The aerogel allows direct heat exchange between the cooling panel and human body via radiation and avoids cooling the entire space. Compared with traditional space air conditioning, a 6-mm polyethylene aerogel–assisted radiant air-conditioning saves the electricity by 31% under the same cooling and ambient temperature. Moreover, high solar reflectance and low thermal conductivity of the porous polyethylene hold great promise of the strategy in working outdoors. Our calculation demonstrates two-thirds of energy saving compared with direct space cooling in a typical summer day in Wuhan. These results show great potential of the cooling method in building cooling both in closed spaces and open conditions.
研究领域:
材料科学
·
能源工程
·
建筑环境
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2025
·
IF 2.7
Yanling Yang,Yining Shi,Yue Shi
Smart windows with adjustable optical properties for energy-saving applications have received increasing attention. In this study, an anisotropic single-domain structure is successfully prepared by shearing-oriented hydroxypropyl cellulose (HPC) in poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) hydrogel network. This composite hydrogel can respond to ambient temperature and solar radiation in the visible and near-infrared light regions for smart window applications. By precisely controlling the component of the composite hydrogel, the cloud point temperature ( T cp ) of the smart window can be significantly tuned from a very high value to below the comfortable temperature for the human body. For example, with 10 wt.% PAMPS and 42 wt.% HPC, the crosslinking hydrogel demonstrates a stable single-domain structure and relatively low T cp . With the addition of NaCl, T cp can be further reduced to even below the human comfort temperature. The oriented composite hydrogel showed excellent durability, flexibility, and thermal radiation shielding under the sunlight simulator with tunable T cp . These properties make the HPC/PAMPS composite hydrogel have a broad application prospect in the realm of energy-efficient building smart windows and effectively improve the comfort of indoor environments with different demands.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Xinyu Zhao,Qixiang Chen,Fan Fan,Qiliang Wang,Yuehong Su,Minsu Liu,Fahua Zhu,Dongliang Zhao
Electrochromic smart windows can actively modulate their reversible transition between transparent and opaque states, adapting to varying climatic conditions and thereby offering a sustainable solution for energy-efficient buildings. However, the operational range of current electrochromic smart windows is mostly limited to the solar spectrum. Expanding this range into the mid-infrared spectrum could significantly enhance their energy-saving capabilities. In this study, a dynamic electrochromic (EC) glass that integrates silver electrodeposition/dissolution with mechanical flipping of the glass panel is designed. This design enables bidirectional dynamic modulation of both the solar spectrum (0.3–2.5 µm) and mid-infrared spectrum (2.5–20 µm), with solar reflectance varying between 87.9% and 19.9%, and mid-infrared emissivity varying between 90.6% and 10.8%. Consequently, the EC glass can dynamically switch between radiative cooling and solar heating modes. The simulation results show that the architectural application of this EC glass, with climate-specific operating modes, can achieve a maximum of over 50% annual heating, ventilation, and air conditioning (HVAC) energy savings, contributing to carbon neutrality and sustainable development.
研究领域:
材料科学
·
能源工程
·
建筑技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）