CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Lele Yang,Hong Chen,Yuntao Xu,Rong Qian,Qiao Chen,Yuanxing Fang
The efficiency of hydrogen peroxide evolution reaction (H 2 O 2 ER) by photoanodic water oxidation is normally limited by low yield and poor selectivity. In this work, the surfaces of Mo doped BiVO 4 are modified by Co 2+ and PO 4 3- ions (CPMB), which has been used as the photoanode with improved H 2 O 2 yield and selectivity. The optimal evolution rate of the CPMB is ca. 0.23 µmol·min −1 ·cm −2 , corresponding to 2.5 times to the pristine BiVO 4 photoanode, and the faradaic efficiency of CPMB photoanode for H 2 O 2 ER is ca. 26%. In this study, the mechanism for the improved H 2 O 2 evolution performance of CPMB has been investigated, indicating that PO 4 3- ions mainly promote the formation of the •OH by dissociation of H 2 O, while Co 2+ ions accelerate the conversion of the •OH for the subsequent H 2 O 2 evolution. This study offers the strategy for designing an efficient photoelectrochemical system with optimized solar conversion efficiency for H 2 O 2 production.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiangli Shi,Pengfei An,Qiong Zhang,Qi Song,Deli Jiang,Dan Tian,Di Li
Photocatalytic CO 2 conversion into value-added chemicals is a promising strategy to remedy the energy crisis and environmental pollution, yet developing cost-effective photocatalysts that can efficiently and selectively convert CO 2 to desirable products is still a great challenge. Herein, we construct a Fe 2 P nanoparticles decorated on the surface of the nitrogen vacancies (NVs) modified g-C 3 N 4 nanosheet hybrid photocatalyst (Fe 2 P/NVsCN) for photocatalytic conversion of CO 2 to CO. The NVs can significantly improve the visible light absorption due to the formation of midgap state, and the metallic Fe 2 P as the cocatalyst is beneficial to promote the photo-generated charge separation and migration, impede the side reaction, in which improve the activity and selectivity. By adjusting the contents of Fe 2 P and NVsCN, the optimal 20%-Fe 2 P/NVsCN(1:5) sample shows an excellent CO evolution rate in visible light of 22.48 µmol g -1 h −1 with 97.5% selectivity, which is superior to most reported g-C 3 N 4 -based photocatalysts. Furthermore, this photocatalyst also exhibits good stability due to the timely consumption of electrons, and it maintains stable CO evolution rate over 20 h. This work opens a new horizon for design and construction of active photocatalyst with high selectivity by synergistic modulating the surface vacancy and cocatalyst.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
·
2015
·
IF 3.082
Lei Rao,Zhenzhen Xu,Yongtao Wang,Feng Zhao,Xiaosong Hu,Xiaojun Liao
The objective of this study was to investigate the inactivation of the Bacillus subtilis spores by high pressure CO 2 combined with high temperature (HPCD + HT) and to analyze the clumping effect of the spores on their HPCD + HT resistance. The spores of B . subtilis were subjected to heat at 0.1 MPa and HPCD at 6.5–25 MPa, and 82 °C, 86 °C, and 91 °C for 0–120 min. The spores were effectively inactivated by HPCD + HT, but a protective effect on the spores was also found, which was closely correlated to the pressure, temperature and time. The spores treated by HPCD + HT at 6.5 and 10 MPa exhibited a two-stage inactivation curve of shoulder and log-linear regions whereas the spores at 15–25 MPa exhibited a three-stage inactivation curve of shoulder, log-linear and tailing regions, and these curves were well fitted to the Geeraerd model. Approximately 90% of pyridine-2,6-dicarboxylic acid (DPA) was released after HPCD + HT and the 90% DPA release time depend on the pressure and temperature. Moreover, the spore clumping in suspensions was examined by dynamic light scattering. The particle size of the spore suspensions increased with the increase of pressure, temperature and time, indicating the spore clumping. 0.1% Tween 80 as a surfactant inhibited the spore clumping and increased the inactivation ratio of the spores by HPCD + HT. These results indicated that the spore clumping enhanced the spores' resistance to HPCD + HT and induced a protective effect.
研究领域:
微生物学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Mazhar Khan,Zeeshan Akmal,Muhammad Tayyab,Seemal Mansoor,Dongni Liu,Ziwei Ye,Jinlong Zhang,Shiqun Wu,Lingzhi Wang
The rational design of heterojunction photocatalysts is crucial for enhancing CO 2 photoreduction efficiency, yet precisely channeling photogenerated electrons to the CO 2 adsorption sites remains an enormous challenge. In this work, we developed an organic-inorganic heterostructure with continuous inter- and intra-component electric fields. The integration of BiOBr with MIL-125 via chemical bonding established a heterojunction, where the built-in electric field between the two components facilitated the efficient transfer of photogenerated electrons from BiOBr to MIL-125. The intrinsic electric field of MIL-125 further drove the accumulation of photogenerated electrons at Ti sites. This tandem electric field effect, in conjunction with the CO 2 adsorption and activation at Ti sites, significantly enhanced the efficiency of CO 2 reduction within the heterojunction system. The optimized photocatalyst achieving CO production at a rate of 65.6 μmol g −1 h −1 with nearly 90 % selectivity without the use of sacrificial agents, exhibiting a remarkable 43-fold and 8-fold enhancement in activity compared to pristine MIL-125 and BiOBr, respectively. In-situ infrared spectroscopy and theoretical calculations confirmed the energy optimization effect of the heterostructure on CO 2 activation and the hydrogenation reaction, facilitating the formation of the key intermediate *COOH. This work elucidates the mechanism by which tandem built-in electric fields facilitate charge separation.
研究领域:
材料科学
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环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2025
·
IF 6
Guo-Cui Mao,Jin-Peng Wang,Hui-Lin Jiang,Bao-Xia Dong,Yun-Lei Teng
We found that the activated LiBH 4 or Ni/LiBH 4 can effectively assist CO 2 hydrogenation into C1 and C2 products at low temperature (100–300 ℃). After CO 2 hydrogenation over the activated LiBH 4 or Ni/LiBH 4 , CH 4 with approximately 100 % selectivity was formed in the gas phase products. CH 3 OH, HCOO − , and high-value CH 3 CH 2 OH were observed in aqueous solution of spent LiBH 4 or Ni/LiBH 4 after CO 2 hydrogenation. CO 2 conversion and CH 4 production are able to be further improved by doping 5–20 wt% Ni into the activated LiBH 4 . The LiBH 4 sample shows a 61.34 % CO 2 conversion at 200 ℃, while the 20 %Ni/LiBH 4 composite displays an 80.14 % CO 2 conversion under the same conditions. The experimental and theoretical results suggest that the synergistic effect from Ni and LiBH 4 results in high CO 2 conversion at low temperature. This new method for CO 2 conversion to C1, C2 products using the activated Ni/LiBH 4 composite may enlighten the materials design for CO 2 utilization.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Pengjing Chen,Guofeng Zhao,Ye Liu,Yong Lu
A series of Ni 5 Ga 3 / m -SiO 2 /Al 2 O 3 /Al-fiber ( m = 0, 0.5, 1.0, 3.0 and 5.0 wt%) catalysts have been developed for CO 2 hydrogenation to methanol at ambient pressure. Microfibrous-structured SiO 2 /Al 2 O 3 /Al-fiber supports are obtained though endogenous growth of free-standing boehmite (AlOOH) nanosheets onto a three-dimensional (3D) network of 60 μm-Al-fiber thin felt with the aid of steam-only hydrothermal oxidation reaction between Al metal and H 2 O (2 Al + 4H 2 O → 2 AlOOH + 3H 2 ), followed by calcination and SiO 2 -modification using silica sol. The bimetallic Ni 5 Ga 3 nanoparticles are then placed onto the pore surface of as-obtained SiO 2 /Al 2 O 3 /Al-fiber support by co-impregnation method using Ni and Ga nitrates as precursors followed by reduction in H 2 at 630 °C. The promising Ni 5 Ga 3 /1-SiO 2 /Al 2 O 3 /Al-fiber catalyst is capable of converting 2.3% CO 2 into CH 3 OH with a high selectivity of 86.7% as well as 10.3%/3.0% selectivities to CO/CH 4 at 210 °C, for a feed of CO 2 /H 2 /N 2 (2/6/1, molar ratio). Such microfibrous-structured catalyst design combines the promising catalytic performance of Ni 5 Ga 3 with the enhanced heat transfer and high permeability of the Al 2 O 3 /Al-fiber support. The effect of SiO 2 loading on the formation of Ni 5 Ga 3 alloy nanoparticles is also discussed.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yang Wang,Sidi Wang,Zhen Li,Liwei Sun,Xiaoyu Yang,Shaokun Tang
UiO-66 nanocrystals were synthesized by supercritical reaction crystallization with anhydrous zirconium chloride as the metal precursor, terephthalic acid as the ligand, and a small amount of N,N-dimethylformamide (DMF) and formic acid as cosolvents in supercritical CO2. In our work, the product UiO-66 obtained exhibits typical octahedral morphology with a specific surface area of 1092 m2/g and concentrated micropore diameters of 0.77, 1.05, and 1.73 nm. The thermal decomposition temperature of the product is 450 °C. It was found that the adsorption selectivity of UiO-66 for Congo red is much higher than those for methylene blue and methyl orange, which can reach up to over 1300 mg/g. The adsorption process conforms to the second-order adsorption kinetics curve, and the adsorption isotherm fits into the Langmuir model. Meanwhile, the adsorbent UiO-66 possesses good cycle stability and its adsorption performance remains excellent after seven cycles.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Qiong Liu,Chengbo Bai,Die He,Xueting Wu,Yiping Wu,Rong Chen
Surface defects in semiconductors play a significant role in modulating the performance of photocatalytic reactions. However, there is still insufficient exploration regarding the influence of defects on the photocatalytic CO 2 reduction performance. In this study, we achieved controllable construction of oxygen vacancies (OVs) in BiOX (X=Cl, Br) samples through one-step solvothermal treatment in polyols by adjusting the reaction time. The introduction of OVs significantly enhanced the photocatalytic activity of BiOX (X=Cl, Br) for converting CO 2 to CO. Among all the tested BiOX (X=Cl, Br) samples with OVs, BiOCl-OV-2 and BiOBr-OV-2 samples with a moderate amount of OVs exhibited the highest CO yield of 28.51 and 15.22 μmol g cat −1 after 4 hours of irradiation, respectively. Photo-/electrochemical measurements results revealed that engineering OVs into BiOX (X=Cl, Br) effectively adjusted their electronic structure, charge density and separation; however, excessive OVs may slightly degrade their photoelectrochemical properties and thus lead to reduced photocatalytic activity. Furthermore, an appropriate amount of OV was found to enhance both CO 2 adsorption capacity and photo-generated electron reduction ability, thereby further promoting the overall efficiency of photocatalytic CO 2 conversion. Through in situ FTIR spectra analysis, we uncovered the process of photocatalytic conversion from CO 2 to CO.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Chunying Liu,Li Lv,Kun Liu,Junsu Jin,Jianguo Mi,Yongqiang Ren,Shisen Xu
By coupling CALF-20 on ZIF-7 via in situ crystallization in the confined micrometer-sized pores of poly(acrylates), a novel composite, namely, CALF-20-on-ZIF-7@poly(acrylates), has been synthesized for the simultaneous removal of CO2 and H2S from IGCC feed gas. Within this coupled crystal, CALF-20, known for its strong adsorption capacity and excellent stability toward CO2 and H2S, serves as the outer layer crystal to shift the adsorption/desorption hysteresis loop of inner ZIF-7 to beyond atmosphere pressure. Under high pressure, CO2 and H2S are automatically adsorbed. Upon reducing the pressure to the atmospheric level, CO2 is automatically released, while H2S remains temporarily due to its high adsorption energy. After about 150 cycles of CO2 adsorption/desorption of the kilogram-scale composite, H2S approaches saturation and is then removed by vacuuming. Since the content of H2S in IGCC feed gas is trivial, the total energy consumption for the composite regeneration is 0.16 MJ/kg (CO2). After 600 consecutive cycles, the CO2 adsorption capability of the composite decreases by 0.41%, demonstrating excellent cyclic stability.
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
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Xiaoxue Zhao,Jingru Guan,Jinze Li,Xin Li,Huiqin Wang,Pengwei Huo,Yongsheng Yan
The conversion of CO 2 into high value-added carbon-based compounds through photocatalytic reduction technology is considered as one of the more promising strategies to solve the greenhouse effect. And construction of heterojunction photocatalysts can promote the separation of photoelectron-hole pairs, so as to achieve higher activity of photocatalytic CO 2 reduction. Hence, Pt@CeO 2 /3DCN heterojunction are prepared by calcination method and photoreduction technology. The photocatalytic results revealed that Pt@CeO 2 /3DCN show better photocatalytic activity for reducing CO 2 into CO and CH 4 , compared with 3DCN. Especially, Pt@45CeO 2 /3DCN shows the maximum photocatalytic activity of 4.69 and 3.03 μmol·h −1 ·g −1 for CO and CH 4 under UV light irradiation, respectively, and the reduction activity did not decrease significantly after five cycles. The enhanced photoreduction of CO 2 performance can be ascribed to the synergistic effects of the oxygen vacancies in CeO 2 for CO 2 activation and heterojunction for electron separation. Besides, Pt nanoparticles (NPs) on CeO 2 /3DCN can further promote the transfer of electrons, resulting in higher photocatalytic activity.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ISIJ INTERNATIONAL
·
2017
·Vol. 57
·期 1
·62-67
·
IF 1.11
Zijian Su,Yuanbo Zhang,Yingming Chen,Guanghui Li,Tao Jiang
A considerable amount of works were focused on the formation mechanism of calcium ferrite phases during the iron ore sintering process, especially under various O2 content atmospheres at temperatures higher than 1100°C. But little attention has been paid on reactions between CaO and iron oxides in CO–CO2 atmospheres at lower temperatures. In this study, the solid state reaction mechanisms between CaO and Fe3O4 under CO–CO2 atmospheres at 800°C–1100°C were revealed by using XRD, VSM, etc. The results indicated that Ca2Fe2O5 was easily formed under 5–50 vol% CO/(CO+CO2) atmosphere above 850°C via the reaction of 6CaO + 2Fe3O4 +CO2 = 3Ca2Fe2O5 + CO and the reaction would be promoted with increasing the roasting temperature. In the CO–CO2 atmosphere, Fe3O4 is easily oxidized to Fe2O3 in the presence of CaO because CO2 components act as oxidative medium for the oxidation of Fe2+ to Fe3+.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 4
·2040-2046
·
IF 3.361
Yang Liu,Xin Liang,Jie Zhang,Jimmy Yun,Zuobo Yang
In this study, monodispersed NiRu nanocrystals with a diameter of 3 nm were synthesized at 90 °C via a tuning hot-inject method to lower the temperature of the organic phase synthesis of monodispersed nanomaterials. The key factor for the nanocrystalline formation of NiRu alloy nanocrystals was summarized in detail. Simultaneously, the synergistic effect of Ni and Ru in CO2 methanation was explored. Doping trace Ru can significantly improve the conversion rate of CO2 methanation and CH4 selectivity. The underlying mechanism was studied in detail via X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed hydrogen reduction (H2-TPR) and desorption (H2-TPD) tests, and temperature-programmed desorption of CO2 (CO2-TPD). This study gives out a new way for the general synthesis of monodisperse nickel-based nanocrystals and provides a reference for the development and application of monodispersed nanoparticles for CO2 methanation.
研究领域:
材料科学
·
催化
·
纳米技术
·
化学工程
✓ 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）