ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Jiayu Feng,Kai Li,Ping Ning,Chi Wang,Xin Sun,Fei Wang,Peng Gao
In this study, a series of Mg-modified γ-Al2O3 sorbents have been introduced to simultaneously remove HCl and HF in a low-temperature environment. These sorbents were prepared by impregnation, and the effects of Mg loading amount and calcination temperature on the performance of the sorbent were investigated. The optimal sorbent (modified by 15 wt% Mg and calcined at 400℃, Mg15/Al2O3-400) exhibited the highest adsorption capacity of all the sorbents tested, 37.89 mg(HF)•gsorbent−1 and 34.54 mg(HCl)•gsorbent−1, respectively. Taking into account an excellent HF(HCl) capacity of the Mg15/Al2O3-400, these sorbents are very promising HF(HCl)sorbents usable in a low-temperature environment. The role of MgO loaded on γ-Al2O3 was investigated by Brunauer−Emmet−Teller (BET) method, X-ray diffractometer (XRD), scanning electron microscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption of CO2 (CO2-TPD), and thermogravimetric analysis (TG-DTG). The results revealed that MgO acted as a ‘leading role’ to promote the adsorption activity of the sorbents. BET analysis demonstrated that the Mg modification process did not seriously change the pore type of the γ-Al2O3. CO2-TPD results revealed that the calcination temperature will significantly affect the number and strength of the basic sites on the surface of the sorbent. In addition, XRD and XPS analysis indicated that the consumption of MgO and the accumulation of reaction products on the surface and pores are the main reasons for the deactivation of the sorbent.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Kande Liu,Sitan Wang,Lishan Zheng,Yuan Fang,Ranran Tao,Naiwang Liu,Fahai Cao,Xuan Meng,Li Shi
As a crucial fine chemical intermediate, the compound 4-TBP holds significant importance in both antioxidant synthesis and the production of various fine chemical products, including resins, flame retardants, surfactants, and ultraviolet absorbers. However, traditional catalysts employed in the production of 4-TBP are plagued by several drawbacks, such as equipment corrosion, environmental contamination, and inadequate thermal stability. In order to overcome these challenges, a series of Hβ-x% MgO catalysts with varying MgO loadings were successfully synthesized using the immersion method. These catalysts were comprehensively characterized through multiple analytical techniques, including XRD, FT-IR, SEM, N 2 adsorption–desorption analysis, ICP-OES, Py-IR, 27 Al and 29 Si MAS NMR and CO 2 -TPD. These materials were subjected to catalytic evaluation through the phenol alkylation process using tert -butyl alcohol as the alkylating agent. Notably, the Hβ-2.5% MgO catalyst demonstrated superior performance, a remarkable selectivity of 88.2% toward 4-TBP production was attained, which represents a 14.7% improvement over the unmodified Hβ zeolite. The study scope was expanded to incorporate methanol as an alkylation agent, consistent reaction rules were observed, which contributes significantly to the understanding of alcohol-mediated phenol alkylation studies.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 85
·54068-54077
·
IF 3.108
Wenhan Chen,Qi Luo,Xueshuang Deng,Jianfeng Zheng,Chenxi Zhang,Xiaohong Chen,Sumei Huang
The morphology of electron transport layers has a significant impact on the device architecture and electronic processes of mesoscopic perovskite solar cells (PSCs). In this study, ultrathin MgO is coated on the surface of compact TiO2 (c-TiO2). The MgO-coated c-TiO2 is first used as seeds to hydrothermally grow one-dimensional (1D) TiO2 nanorod (NR) arrays for PSC devices. Rutile nanorod arrays are fabricated via a facile solvothermal method using tetrabutyl titanate (TBT) as the Ti precursor. The microstructures and morphologies, including nanorod diameter, length, and areal density, of the TiO2 NR arrays are varied by controlling the concentration of TBT from 0.3 M to 0.7 M. Furthermore, the profound effects of the MgO modification and titania nanorod morphology on the pore-filling of perovskite CH3NH3PbI3, charge separation and recombination at the perovskite/titania nanorod interface are investigated. Our results reveal that the Ti precursor concentration strongly affects the open-circuit voltage (VOC), short-circuit current density (JSC), and fill factor (FF) of the 1D TiO2 NR array-based device. Under optimized conditions with MgO coating and at 0.4 M TBT, our champion cell with 1D TiO2 NRs demonstrates a power conversion efficiency (PCE) of 17.03% with JSC = 22.01 mA cm−2, VOC = 1.06 V, and FF = 0.73. Under the same fabrication conditions, MgO modification enhances the average PCE to 16.24% for the PSCs with the MgO coating from 13.38% for the PSCs without the MgO coating. The devices show an approximately 18% improvement in performance, which mainly results from the open-circuit voltage and fill factor enhancements. Moreover, advantageously, the MgO modification is found to reduce the current density–voltage (J–V) hysteresis with respect to the scan direction and improve the UV stability of the non-encapsulated cells. Therefore, this study presents a promising approach to fabricate efficient and stable one-dimensional TiO2 nanorod array-based perovskite solar cells.
研究领域:
材料科学
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光电子学
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能源研究
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Hai Liang,Jianjiang Wang,Wanting Wang,Yingli Wang,Xinzhong Deng,Zhishuang Xue,Yang Sun,Gaohong He,Xuehua Ruan
Developing efficient biochar (BC) adsorbent for pollution removal has been a long-term exploration. However, the negative charge surface of pristine BC seriously impedes the transfer of anionic dye through the pore of BC and results in low adsorption capacity. Herein, N-doping enriched porous MgO-modified biochar (MBC) was successfully prepared through a facile nitrate activation method for anionic acid fuchsin (AF) removal. The N-doped group of secondary amine in MBC changes the surface charge of BC and facilitate the AF adsorption onto MgO . The as-prepared MBC exhibited superior adsorption capacity of 328 mg⋅g −1 . The adsorption process was well aligned with the Freundlich and pseudo-second-order kinetics models indicating a hybrid physicochemical adsorption mechanism. Further mechanism investigation indicates that N-doped group, MgO and functional groups in biochar matrix primarily contribute to AF adsorption. The mechanism includes: electrostatic attraction, π-π interaction, hydrogen bonding and pore filling. This research provides an environmentally friendly nitrate activation strategy for BC, which overcomes the inherent defects of BC in negative charge surface and provides a facile way of biomass valorization for pollution removal from the aquatic environment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Wei Zhang,Fusheng Yin,Zhenhui Cheng,Suping Peng,Chunwen Sun
To achieve the commercial application of solid oxide fuel cells (SOFCs), the performance degradation of the cell caused by carbon deposition needs to be well addressed. Here we report a new anode with nanostructured heterogeneous interfaces by integrating 0.38 wt% Sn and 0.19 wt% MgO into Ni SDC for hydrocarbon-fueled SOFCs. The cell with 0.38Sn–0.19MgO Ni SDC anode exhibits a peak power density of 374 mW cm −2 and excellent long-term stability for 100 h with a power attenuation about 13.5% in humidified methane at 700 °C, which is attributed to the decreased rate of carbon deposition by promoting the formation of C O bonds instead of C C bonds, increasing the activation barrier for methane cracking and preventing the formation of nickel carbides by the confinement effect of heterogeneous catalysts, and the enhanced rate of carbon removal is attributed to excellent hydrophilicity and adsorption of CO 2 , as revealed by combined density function theory (DFT) calculations and experimental characterizations. This finding offers potential for the application of hydrocarbon-fueled SOFCs and provides a guide for designing coking-tolerant anodes.
研究领域:
材料科学
·
能源工程
·
化学工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
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