FUEL
·
2019
·
IF 5.128
Lina Han,Weiguo Ren,Bing Wang,Xingxing He,Lingjun Ma,Qihuang Huo,Jiancheng Wang,Weiren Bao,Liping Chang
In this work, a novel method is introduced to activate coal gangue (CG) for extraction of Si and Al species. The activation experiments were carried out using a stainless steel tube reactor (17 mL) and an autoclave reactor (1000 mL). Firstly, CG was activated by supercritical water added with alkali. It was found that the kaolinite phase of raw CG could be transformed into cancrinite, sodalite and kalsilite by using NaOH, Na 2 CO 3 and KOH as activators, respectively. Secondly, silica (SiO 2 ) and alumina (Al 2 O 3 ) were prepared by acid and alkali combination method. The extraction rates of Al 3+ and Si 4+ from the activated CG using KOH as activator were as high as 78.9% and 69.2%, respectively. The purity of SiO 2 and Al 2 O 3 products were 96.2% and 99.3%, respectively. The as-synthesized SiO 2 both from 17 mL and 1000 mL reactor exhibited very high specific surface areas of 710.0 m 2 ·g −1 and 872.8 m 2 ·g −1 , respectively. In addition, the SiO 2 after hydrophobic modification displayed excellent absorption selectivity for xylene.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Yihu Dai,Xiaofang Chu,Jingjing Gu,Xing Gao,Min Xu,Di Lu,Xiaoyue Wan,Wei Qi,Bingsen Zhang,Yanhui Yang
The CeO 2 -supported ternary RuSnB catalysts were synthesized by incipient wetness impregnation procedures and applied in hydrogenation of cinnamaldehyde in pure water as the solvent. A synergy effect between Ru-based catalysts and water molecules has afforded the efficiently selective transformation of cinnamaldehyde to cinnamyl alcohol with the satisfactory conversion and selectivity. Structural characterization results suggested the incorporation of Ru sites into the SnO x matrix and the electronic interaction between Ru and B additives in RuSnB/CeO 2 catalyst. The isotopic exchange studies have demonstrated that both dissociative activation of H 2 and H 2 O (deuterated D 2 and D 2 O) were apparently affected by the status of Ru sites. Furthermore, the kinetics tests in D 2 O solvent have also revealed the co-existence of water-involved hydrogen-exchange route with the direct hydrogenation route using dissociative H 2 during the hydrogenation reaction. The optimal Ru 2 Sn 1 B 1 /CeO 2 catalyst could afford the best H 2 O-activation capability and thus accelerate the reaction rate in the H 2 O-involved hydrogenation.
研究领域:
催化化学
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绿色化学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Ben-Qing Huang,Yong-Jian Tang,Zuo-Xiang Zeng,Shuang-Mei Xue,Shan-Qing Li,Yi-Ru Wang,En-Chao Li,Chuyang Y. Tang,Zhen-Liang Xu
Separation performance of nanofiltration (NF) membranes is constrained by the trade-off between permeability and selectivity. Herein, a facile and environmental friendly water activation before microwave heating was performed to improve the performance of NF membranes and overcome this trade-off. The water activation before microwave heating facilitated the hydrolysis of acyl chloride, resulting in a loose polyamide layer with enhanced hydrophilicity and surface charge. The activated NF membrane showed a permeance of 29.9 L m -2 h -1 bar -1 , which is almost 2 times higher than the control. The membrane possesses a Na 2 SO 4 rejection of 96.8% and high selectivity to antibiotics and NaCl. At the meantime, the fouling resistance to model foulants including bovine serum albumin and sodium alginate was significantly enhanced. The water activation before microwave heating is proved to be an adequate strategy for fabricating NF membranes.
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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产品关联
DOI
高影响因子
Environmental Science-Nano
·
2023
·Vol. 10
·期 11
·3072-3083
·
IF 7.3
Chuanqi Pan,Biluan Zhang,Tingyu Pan,Hui Huang,Siyi Song,Xitong Cai,Yuhang Wang,Hongwei Sun,Zhu Luo,Lizhi Zhang,Yanbing Guo
The dual activation mechanism of molecular oxygen (O2) and water (H2O) in the local structure of catalysts has not been elucidated yet. Herein, we report a strategy for manufacturing fully exposed Ag4 sites in nano silver/graphdiyne (Ag/GDY) composites for activating O2 and H2O. The synthesized nano Ag was uniformly anchored on the surface of GDY without any surfactant added, with an average particle size of 2.5 nm. The unique sp-hybrid C and triangular pore structure of GDY not only regulate the stable geometric structure of nano Ag, but also enhance the adsorption ability of Ag4 sites for O2 and H2O molecules in nano Ag/GDY. Electron spin resonance spectroscopy and density functional theory calculation results proved that O2 is more favorable to synergistically promote the activation of H2O to generate reactive ·O2− and ·OH radicals on the nano Ag/GDY surfaces, leading to outstanding antibacterial activity. This work provides a simple strategy for the preparation of stable nano Ag and proposes to improve the catalytic oxidation activity by adjusting the local electronic structure of catalysts to activate O2 and H2O.
研究领域:
材料科学
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催化化学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yun Bai,Yuanjie Gu,Jiayue Chen,Yiying Yue
Solar-driven desalination has received considerable attention as a promising approach to alleviate water scarcity due to its environmental friendliness and energy efficiency. In this study, an efficient biomass-based evaporator was developed through coordinating diatomite and titanium carbide MXene (Ti 3 C 2 T x ) on delignified coconut husk. Owing to the numerous hydroxyl and carboxyl groups present on the surfaces of diatomite, MXene, and the cellulose in coconut husks, the introduction of these additional hydrophilic groups stimulated water activation, thereby increasing the proportion of intermediate water. The excellent structural design and constituent materials of the evaporator contributed to reducing the evaporation enthalpy of water by approximately 18%. In addition, the obtained evaporator was light weight, remarkably strong, and exhibited an excellent light absorption capacity (∼91.48%), low thermal conductivity (0.04716 W m −1 K −1 ), and low evaporation enthalpy (∼1854 J g −1 ). The resultant evaporator delivered a water evaporation rate of 2.1 kg m −2 h −1 and a photothermal conversion efficiency of 90.64% under 1 sun exposure. The evaporator exhibited remarkable durability, salt resistance, metal ion adsorption, and dye removal properties. Therefore, this study provides a novel approach to realize the high-value utilization of waste coconut husks that is promising for solar steam generation applications.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Mingna Chu,Kai Cui,Yan Zhou,Xiuzhi Yuan,Wei Qin,Yang Li,Xiaohong Wu
Enhancing the photoreduction of carbon dioxide (CO 2 ) to produce valuable chemicals, such as carbon monoxide (CO), is of significant importance. The bottleneck in developing advanced catalysts lies in the rational design of catalytic centers with efficient CO 2 activation and hydrogen proton production. In this work, palladium nanoparticles (Pd NPs) were successfully modified on UiO-66-NH 2 -Zn SAs (UN-Zn SAs) by a photo-deposition method. The optimized photocatalyst , 4 Pd NPs-UN-0.7Zn SAs, demonstrated exceptional performance in converting CO 2 to CO, exhibiting approximately 1.4-fold and 7.8-fold enhancements compared to UN-0.7Zn SAs and UN, respectively. A combination of time-resolved photoluminescence spectroscopy and electron paramagnetic resonance results unveiled that the introduction of Pd NPs effectively promoted the photogenerated charge separation and facilitated water activation to produce more hydrogen protons. The generated hydrogen protons were subsequently coupled with nearby CO 2 that was activated by Zn SAs, thus achieving the facile water-activation-induced CO 2 reduction process. Theoretical calculations further confirmed that the heterogeneous synergistic effects between Zn SAs and Pd NPs lowered the energy barrier for the rate-limiting step of CO 2 conversion to COOH* , thereby achieving efficient photocatalytic CO 2 reduction reactions. This work provides a new perspective on the development of efficient catalysts for the effective conversion of CO 2 .
研究领域:
化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 23
·7048-7056
·
IF 6.177
Xuelian Chen,Zhaochi Feng,Dongyuan Zhao,Qihua Yang,Can Li
Metal oxide catalysts have been widely used in steam reforming of methanol (SRM), but they face the challenge of long-term running. Herein, we report a ZnCeZrOx catalyst that can operate in SRM stably at 400 °C. The H2 production rates of Zn1CeyZr9Ox catalysts are estimated to be in the range of 103.8 to 109.5 μmolH2 gcat−1 s−1 with methanol conversion rates varying in the range of 93.6% to 99.8% at a WHSV of 4.5 h−1. The enhanced activity and stability of the ZnZrOx solid solution catalyst is mainly attributed to the large number of oxygen vacancies for water activation and the stable solid solution structure induced by Ce doping. This work indicates that matched rates for H2O and methanol activation are essential in SRM.
研究领域:
催化
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-7
·
IF 5.578
Li Xiaodong,Wang Zhi,Zhang Zemin,Chen Lulu,Cheng Jianli,Ni Wei,Wang Bin,Xie Erqing
The photoelectrochemical (PEC) water splitting is hampered by strong bonds of H 2 O molecules and low ionic conductivity of pure water. The photocatalysts dispersed in pure water can serve as a water activation agent, which provides an alternative pathway to overcome such limitations. Here we report that the light illuminated α−Fe 2 O 3 /Pt nanoparticles may produce a reservoir of reactive intermediates including H 2 O 2 , ·OH, OH − and H + capable of promoting the pure water reduction/oxidation half−reactions at cathode and highly photocatalytic−active TiO 2 /In 2 S 3 /AgInS 2 photoanode, respectively. Remarkable photocurrent enhancement has been obtained with α−Fe 2 O 3 /Pt as water activation agent. The use of α−Fe 2 O 3 /Pt to promote the reactivity of pure water represents a new paradigm for reproducible hydrogen fuel provision by PEC water splitting, allowing efficient splitting of pure water without adding of corrosive chemicals or sacrificial agent.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Shuting Liu,Ziyu Zengcai,Jingyao Yang,Tianhao Wang,Wenting Lin,Yunhong Pi,Tiejun Wang
To achieve highly efficient in situ hydrogen release from methanol/water reforming at lower temperature, integrating solar-energy provides a promising strategy to activate methanol/water while significantly reducing the activation energy. Herein, we report a series of novel MOF-based photothermal catalysts, mUiO-67-bpy-CuX, featuring enhanced H 2 O affinity and spatially isolated Cu-pyridine active sites for photothermal-driven reforming process of methanol solutions (PTRM). These catalysts exhibit distinct active sites that separately adsorb and activate H 2 O and CH 3 OH, with synergistically photothermal effect leading to an exceptional H 2 evolution activity of 121.1 mmol‧g cat −1 ‧h −1 within 80 min at 210 ℃ and an overall turnover number (TON) of 25904 over 68 hours without significant deactivation, with a high apparent quantum efficiency (AQE) of 54 %. Notably, the activation energy is reduced by 44 % compared to thermal-only systems, and the H 2 production is initiated even at 100 °C. The photothermal H 2 evolution activities of mUiO-67-bpy-CuX correlate with the lability of X counteranions, suggesting open coordination environments of Cu sites generated by labile X groups facilitate Cu + -N intermediate formation upon photoexcitation. Additionally, the Zr 6 nodes and increased mesoporosity in the modulated MOF enhance H 2 O adsorption and dissociation at low temperatures, promoting OH‧ generation. While Cu + -N interfaces are responsible for effective cleavage of the C-H bonds in CH 3 OH. This work highlights the design of MOF-based photothermal catalyst with isolated metal sites for enhanced H 2 production from CH 3 OH/H 2 O reforming at low temperatures.
研究领域:
化学工程
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材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yihang Xue,Dahai Zeng,Yuying Meng,Bing Du,Haifang Xie,Lei Ma,Yufeng Wang,Qingsheng Gao
Atomic transition metal-nitrogen (M-N x ) active sites dispersed on carbon matrix have emerged as highly promising electrocatalysts for energy conversion systems, owing to their maximized metal center utilization and excellent conductivity of the carbon substrate. However, conventional symmetric M-N 4 configurations often exhibit limited hydrogen evolution reaction (HER) activity in alkaline due to the inferior water dissociation capacity. In this work, isolated Co single atoms anchored on N -doped hollow carbon substrates (Co SA /NHCs) are successfully fabricated by the pyrolysis of Co 2+ -containing polypyrrole (Co-PPY) precursor, and the subsequent removal of embedded Co particles. Thanks to the high density of atomically distributed asymmetric Co-N 4 moieties, which facilitate efficient water activation and optimal adsorption of the active hydrogen (H*), the synthesized Co SA /NHCs electrocatalysts show remarkable HER activity and stability in alkaline electrolyte. Besides, they can effectively electrolyze HER in acidic medium, undergoing the Volmer-Heyrovsky pathway. Remarkably, Co SA /NHC-800, pyrolyzed at 800 °C, requires small overpotentials of 230 and 228 mV to achieve the current density of −10 mA cm −2 in 1.0 M KOH and 0.5 M H 2 SO 4 solutions, respectively. Moreover, it displays small Tafel slopes, high Faradic efficiencies (∼100 %) and superior long-term stability. This study paves a strategic approach for designing high-performance single-atom electrocatalysts through asymmetric structural engineering.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Mengmeng Shao,Haodeng Chen,Shiji Hao,Haikun Liu,Yongyong Cao,Yanfei Zhao,Jutao Jin,Haifeng Dang,Yue Meng,Yanping Huo,Lifeng Cui
Cocatalyst loading is an efficient strategy to accelerate the hydrogen evolution reaction, which is the final crucial process to complete photocatalytic hydrogen production and realize solar-to-hydrogen conversion. Herein, we report that N-doped vanadium carbide (NVC) is combined with Pt to form a multifunctional cocatalyst capable of enhancing carrier separation, activating H 2 O, and accelerating H 2 evolution. Our designed Pt/NVC/C 3 N 4 displays much higher photocatalytic activity than g-C 3 N 4 loaded with Pt or NVC. The photocatalytic H 2 evolution rate of Pt/NVC/C 3 N 4 reaches 40 μmol/h, which is three times and one hundred times higher than that of Pt/C 3 N 4 and NVC/C 3 N 4 , respectively. The significantly enhanced photocatalytic activity of Pt/NVC/C 3 N 4 is attributed to the partial synergy between Pt and NVC, where NVC promotes carrier separation and activates H 2 O, and Pt is responsible for boosting proton reduction. Our work demonstrates that hybrid cocatalysts exhibit superior performance compared to traditional single-component cocatalysts, providing guidance for exploring highly active cocatalysts for photocatalysis.
研究领域:
材料科学
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化学
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Dingliang Dai,Jianhao Qiu,Jie Xu,Guanglu Xia,Yixin Li,Biyao Fang,Jianfeng Yao
Photocatalytic lignin valorization has garnered significant interest because of its mild reaction conditions and high selectivity. However, the unclear relationships among photocatalysts, reaction solvents, and catalytic activities have hindered further exploration. Herein, we report the innovative synthesis of sulfur vacancy-rich MoS2@ZnIn2S4 heterostructures through one-pot sulfidation of Mo-based metal–organic frameworks (MOFs) for efficient photocatalytic lignin depolymerization. The Mo-MOF-derived MoS2 provides a large surface area and high porosity, enhancing mass transfer, whereas the sulfur vacancies on ZnIn2S4 promote effective charge carrier separation. Notably, the presence of water in the reaction solvent enables the sulfur vacancies to efficiently adsorb and activate water molecules, facilitating proton generation from water dissociation for selective lignin Cβ–O bond hydrogenolysis. The bond cleavage efficiency exhibits a volcano-type trend with increasing water content, achieving optimal performance with 100% conversion of the lignin model compound 2-phenoxy-1-phenylethanol, yielding 78% phenol and 89% acetophenone. This performance significantly surpasses those of MoS2, ZnIn2S4, and the sulfur vacancy-poor MoS2@ZnIn2S4. This work provides critical insights into the solvent-dependent reactivity of catalysts in lignin depolymerization and underscores the potential of defect engineering in photocatalytic biomass valorization.
研究领域:
催化化学
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生物质转化
·
光催化
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材料科学
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能源化学
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环境科学
·
纳米材料
✓ 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）