APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Lingtun Hao,Maofeng Ding,Song Song,Yong You,Xingang Li
Photocatalytic amino acid synthesis from biomass is a promising and renewable method, yet the synthesis efficiency remains suboptimal. Here, we report a novel strategy for synthesizing 2D/2D CdS/1T-MoS 2 heterojunctions by leveraging 1T-phase MoS 2 with distorted octahedral coordination and sulfur-rich edges to promote the formation of large contact areas and abundant interfacial sulfur vacancies in combination with CdS. CdS/1T-MoS 2 displays exceptional photocatalytic performance for amination of biomass-derived α-hydroxy acids to α-amino acids, achieving an alanine formation rate of 23.3 mmol·g -1 ·h -1 from lactic acid, which is 4.4 and 1.6 times higher than those of CdS and CdS/2H-MoS 2 , respectively. Detailed characterizations reveal that CdS/1T-MoS 2 possesses abundant interfacial sulfur vacancies at the 2D/2D heterojunction interface compared to CdS and CdS/2H-MoS 2 . These vacancies create numerous Lewis acids sites, significantly enhancing the adsorption and activation of hydroxyl groups in lactic acid, thereby promoting the dehydrogenation step. Moreover, CdS/1T-MoS 2 facilitates the condensation of pyruvic acid with ammonia and promotes the desorption of alanine from the catalyst surface, effectively improving the reductive amination step. Additionally, CdS/1T-MoS 2 exhibits superior charge carrier separation and migration efficiency, further boosting its photocatalytic amination activity. This study provides a novel strategy for synthesizing 2D/2D heterojunctions with abundant interfacial vacancies for efficient photocatalytic biomass valorization.
研究领域:
材料科学
·
催化化学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Sheng Zhao,Jing Xu,Min Mao,Lingjiao Li,Xuanhao Li
A dye-sensitive photocatalytic H 2 evolution reaction (HER) system with photogenerated carrier directed conduction was constructed. The protonated g-C 3 N 4 combines with the sheet-like Co MOF to form a 2D/2D heterojunction via electrostatic self-assembly. The protonated g-C 3 N 4 and 2D Co-MOF directionally adsorb Eosin Y (EY) and triethanolamine (TEOA) molecules through hydrogen bond and complexation to achieve a whole photocatalytic system. The integral structure effectively facilitates the utilization of dye sensitizer and hole sacrificial agent to achieve the effective and stable photocatalytic H 2 evolution capacity. The photocatalytic hydrogen evolution rate of g-C 3 N 4 after protonation is 1.88 times as high as that of the original g-C 3 N 4 . On the basis of 2D/2D heterojunction, Co MOF is doped with rare earth element Sm. The 4f electrons and the difference valences (Sm 3+ and Co 2+ ) further suppress the reorganization of photogenerated excitons to achieve highly efficient photocatalytic HER. The directional coupling of sensitizer and electron sacrificial agent combined with rare earth element doping makes the photocatalytic HER rate of the composite material reached 73.42 μmol . h −1 within 5 h under simulated sunlight.
研究领域:
材料科学
·
光化学
·
能源科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Jiamin Li,Xiaoli Li,Guang Wu,Jiaqing Guo,Xiaohong Yin,Manman Mu
Visible light driven photocatalytic degradation of organic pollutants , such as bisphenol A (BPA) in wastewater, is considered as a promising strategy to solve the environmental issue . A two-dimensional (2D) porphyrin Co-TCPP MOF decorated 2D B-TiO 2−X nanosheet was successfully prepared through a facile hydrothermal method. The 2D–2D heterostructure could give rise to a built-in electric field to effectively promote the interfacial charge transfer and separation of photogenerated electron and holes. The presence of oxygen vacancy in the as-prepared heterostructure could greatly enhance the visible light harvesting ability to generate more photogenerated carriers. The Co-TCPP MOF@B-TiO 2−X exhibited remarkable photocatalytic performance for the degradation of BPA, whose degradation rate was up to 97% within 120 min irradiation. The degradation efficiency of this composite was 7.3 and 19.3 times higher than those of single Co-TCPP MOF and B-TiO 2−X respectively. The intimate contact between B-TiO 2−X and Co-TCPP MOF reduced interface resistance for charge migration, prolonged photoelectron lifetime and facilitated the charge carriers’ separation. The trapping tests verified that ·O 2 - was the mainly active species of BPA degradation. This strategy not only proves that the combination of B-TiO 2−X and Co-TCPP MOF is a feasible strategy to improve the photocatalytic degradation of BPA, but also provides some new inspirations for the construction of efficient 2D–2D composite photocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 11
·1467
·
IF 3
Liying Che,Huanhuan Ji
Hydrotalcite/bismuth solid solution (2D/2D CoAl-LDH/BiO(OH)XI1−X) heterojunction photocatalysts were fabricated through a hydrothermal route. Because of their identical layered structure and interlayer hydroxides, CoAl-LDH(2D) and BiO(OH)XI1−X(2D) form a tightly bonded heterojunction, resulting in efficient light absorption, excitation, and carrier migration conversion. At the same time, the large specific surface area and abundant hydroxyl groups of the layered structure make the heterojunction catalyst exhibit excellent performance in the photocatalytic degradation of organic pollutants. Under visible light irradiation and in the presence of 1 g/L of the catalyst, 10 mg/L of methyl orange (MO) in water could be completely degraded within 20 min, and the degradation rate of tetracycline (TC) reached 99.23% within 5 min. CoAl-LDH/BiO(OH)XI1−Xstill maintained good photocatalytic degradation activity of tetracycline after five cycles, and the structure of the catalyst did not change. The reaction mechanism related to the degradation of TC by photocatalytic reactions was explored in detail, and the photoexcitation of the semiconductor heterojunction, as well as the subsequent free radical reaction process and the degradation pathway of TC were clarified. This work provides a promising strategy for the preparation of efficient photocatalytic materials and the development of water purification technology.
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
Nanoscale
·
2023
·Vol. 15
·期 24
·10437-10446
·
IF 6.7
Xiaodan Yin,Wei Zheng,Haifeng Tang,Peigen Zhang,ZhengMing Sun
Electrode materials play a crucial role in the electrochemical performance of supercapacitors (SCs). In recent years, 1T-MoS2 and MXene have been extensively studied as potential electrode materials. However, 1T-MoS2 suffers from the metastable property, rigorous synthesis process, and nanosheet restacking issue, while the specific capacitance of MXene is restricted, limiting their supercapacitor performance. To fully exploit the advantages of both materials and address their respective problems, 1T-MoS2/Ti3C2Tz 2D/2D heterostructures are synthesized through a simple hydrothermal method. The existence of heterojunctions is confirmed by XPS and TEM. The different ratios between MoS2 and Ti3C2Tz are investigated, and the electrochemical test is carried out in a “water-in-salt” electrolyte (20 mol kg−1 LiCl). The results demonstrate that the heterostructures exhibit enhanced electrochemical performance. The optimized ratio of 1T-MoS2/Ti3C2Tz is 2 : 1, and the specific capacitance reaches 250 F g−1 at 1 A g−1 with a wide potential window of −0.9 to 0.5 V vs. Ag/AgCl. The capacitance retention is 82.3% (at 10 A g−1) after 5000 cycles, and the average coulombic efficiency (ACE) was 99.96%. Assembled into symmetric SCs (SSCs), the energy density of 12.0 W h kg−1 at a power density of 139.9 W kg−1 is achieved with a high voltage of 1.4 V. It also has 82.6% capacitance retention and 99.95% ACE after 5000 cycles at 5 A g−1. This work is expected to stimulate novel research towards the wide application of 2D/2D heterostructures in SCs.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 25
·255402
·
IF 3.5
Chenhui Xu,Furong Xiong,Yao Wang,Jianwei Nai,Wang Zhang
The integration of ultrathin two-dimensional (2D) semiconductors with other conductive 2D materials to form hybrid electrocatalysts with abundant heterointerfaces can enhance the electrocatalytic activity by facilitating interfacial charge transfer. However, the hybrid electrocatalysts with weak interfacial bonding have limited effect on the electrocatalytic performance because the intrinsic activity of interfacial sites cannot be altered by weak interfacial interactions. As a proof-of-concept, we design ultrathin 2D–2D heterostructures with bridge-bonded Ni–O–Ti ligands based on single-layered Ti3C2Tx MXene and metal hydroxides, and further reveal the structure-activity correlation between interfacial bonding and electrocatalytic oxygen evolution reaction by combining theoretical and experimental studies. Density functional theory calculations reveal the modulation of the electronic structure of interfacial metal sites after the formation of bridged interfacial Ni–O–Ti bonding. Compared with the hydrogen-bond-linked heterostructure, the ultrathin 2D–2D heterostructure with bridge-bonded Ni–O–Ti ligands shows enhanced intrinsic activity and stability towards electrocatalytic oxygen evolution with a very low overpotential of 205 mV at 10 mA cm−2 and the long-term durability. This work provides a new understanding and approach for the design and development of 2D hybrid catalysts with highly efficient electrocatalytic activity.
研究领域:
材料科学
·
电化学
·
催化
·
理论化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）