INORGANIC CHEMISTRY
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2023
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IF 4.6
Yulu Wu,Yanning Qu,Chenyang Su,Xiufang Yang,Yuhao Yang,Yanan Zhang,Wenhuan Huang
Single-atom metal-anchored porphyrin-based metal–organic frameworks (MOFs) have shown excellent light absorption, catalytic sites, and high stability during photocatalytic reactions, while there are still challenges for facile assembly with quantum dots to enhance catalytic dynamics. Herein, a kind of Fe single atom-doped MOF material (Fe-MOF-525) was ball milled with CdS in a proper ratio through Fe–N4 and Fe–N–C bonding, which showed the enhanced photoinduced carrier separation ability. As a result, extended light absorption ranges of CdS/Fe-MOF-5252.3 induced the promotion of the photocatalytic hydrogen (H2) value (3638.6 μmol g–1 h–1), which was 7.2 and 2.3 times higher than those of Fe-MOF-525 and CdS. In this work, the facile synthetic technique, specific active sites, and enhanced catalytic dynamics in the composite highlight the future research on MOF-based heterojunctions and their potential photocatalysis applications..
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Lei Sun,Xiang Zhang,Hao Yuan,Hongmin Cong,Yuxing Shi,Jialin Lu,Weilong Shi,Feng Guo
Converting waste biomass into solar evaporator foam has been recognized as an effective strategy for waste recycling and solving the problem of water shortage, but problems of salt deposition and mechanical stability seriously hinder their practical application. Herein, this work proposes a sustainable and high mechanical strength biomass foam (CDs/PPy-CPP) evaporator with zero-dimensional/one-dimensional (0D/1D) hierarchical structure by hydrophilic carbon dots (CDs) and tubular polypyrrole (PPy) are seamlessly integrated into the outer surface of the three-dimensional (3D) carbonized pomelo peel (CPP) biomass foam. The evaporator achieved a high-efficient evaporation rate of up to 2.46 kg m −2 h −1 in 3.5 wt% NaCl solution at 1 sun irradiation, and similarly exhibited outstanding salient evaporation efficiency and resistance to salt deposition in 25 wt% NaCl solution, as well as prominent swage purification ability. Excellent photothermal conversion efficiency is demonstrated attributed to the 0D/1D structure in 3D networks of the CDs/PPy-CPP evaporator, as well as superior mechanical and water transport properties based on the multilayer mesh structure and microscopic water transport pores. The research intends to offer a low-cost, energy-efficient, and environmentally friendly approach to obtain multifunctional photothermal biomass foams and demonstrate the potential applications in seawater desalinization and swage purification.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 23
·6823-6831
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IF 5
Fangfang Huang,Songyue Zhang,Yuhong Chang,Wenwen Chen,Haishun Wu,Jianfeng Jia
In this work, using a synergistic modification strategy of facet engineering and constructing heterojunctions, MoS2/CdS Z-scheme heterojunction catalysts were successfully prepared. The results indicated that CdS-(100) exhibited enhanced photocatalytic benzylamine coupling activity relative to CdS-(002). Compared with pristine CdS, the photocatalytic activity of MoS2/CdS is significantly enhanced. This enhancement can be attributed to the presence of a Z-scheme heterojunction, which improves the separation efficiency of photogenerated carriers. Moreover, even after 5 cycles, the photocatalyst demonstrates a high photocatalytic activity, which proves that the existence of the Z-scheme heterojunction can effectively inhibit the photocorrosion of CdS. In addition, the reaction can be carried out in different reaction pathways under anaerobic and aerobic conditions. This work proposes a systematic approach for constructing MoS2/CdS Z-scheme heterojunction photocatalysts and the green synthesis of imines.
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Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Yuzhen Li,Zhaoxin Sun,Sufang Wang,Runbin Duan,Shaojie Wang,Shuo Li,Borong Lan,Lizhen Gao
Herein, the ternary CdS/Zn 2 In 2 S 5 /g-C 3 N 4 (CdS/ZIS/CN) heterojunction photocatalyst was successfully prepared via a one-pot method for photodegradation of tetracycline (TC) under visible light irradiation. The surface morphology, structure and optical properties of the prepared photocatalytic material were analyzed by XRD , SEM , TEM, UV–vis DRS, FT-IR and PL . Moreover, the experimental results exhibited that the ternary CdS/ZIS/CN photocatalyst revealed excellent photocatalytic activity compared with g-C 3 N 4 . In this work, 94.73% of TC (20 mg/L, pH=11) was degraded by 0.5 g/L 30CdS/ZIS/CN within 60 min of visible light irradiation. Additionally, the degradation rate of the photocatalyst decreased by about 9.41% after the fourth cycle, indicating its high stability and reusability. Subsequently, a possible double type-II mechanism of photodegradation was eventually provided based on active radical capture experiments. The current investigation provided a promising strategy to construct the high-efficiency heterojunction photocatalyst to degrade antibiotic contaminants.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Lili Zhang,Xin Gao,Yuanmiao Feng,Yanhong Yan,Hailin Zhu,Shuiping Liu,Yuan Yu,Bin Yu
The great problem of food spoilage is causing food waste worldwide. However, prolonging the shelf life of food and responding to spoilage are good strategies for dealing with this problem. Herein, we present the design of multifunctional chitosan-based hydrogel-incorporated tryptophan carbon quantum dots (Trp-CDs) with antibacterial properties and pH-mediated fluorescence response (pH = 1–13). This chitosan (CS)/tannic acid (TA)/Trp-CDs hydrogel (CTTC hydrogel) was rapidly formed by a high density of hydrogen bonds and has the advantages of good mechanical properties (1628.55 kPa, 280%), washability (5–10 min), antioxidant activity (95.83%), and antibacterial properties. In practical application with fruits, the hydrogel significantly prolonged the shelf life of strawberries by at least 5 days and oranges by 20 days under ambient conditions. In particular, the hydrogel has good pH-mediated fluorescence responsiveness and reversibility due to doping with Trp-CDs, laying a foundation for its application in response to food spoilage.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Jianing Li,Juan Chen,Yanhui Ao,Xin Gao,Huinan Che,Peifang Wang
The construction of dual Z-scheme photocatalysts is an effective way to promote the separation and migration of electrons-holes as well as retain their high redox abilities. Herein, a distinctive dual Z-scheme photocatalyst based on phase junction WO 3 and CdS (CW) was successfully fabricated via hydrothermal method and in-situ precipitation process. The as-prepared materials showed the advantages of both phase junction and dual Z-scheme mechanism (promoted utilization of carriers and improved redox potential). As a result, the k app value of 75CW (0.05237 min −1 ) was 29.8 times that of phase junction WO 3 (0.00176 min −1 ) and 2.9 times that of CdS (0.01799 min −1 ) in terms of imidacloprid (IMD) degradation. Trapping experiment and electron spin resonance (ESR) proved the dual Z-scheme mechanism, the key to significantly improve photocatalytic degradation efficiency of WO 3 /CdS nanocomposites. Combined the analysis of liquid chromatography-mass spectrometry (LC-MS) with density functional theory (DFT) calculation, rational degradation pathways of IMD were put forward in detail. This work is excepted to provide new horizons for the construction of dual Z-scheme system with phase junction and the photodegradation of IMD.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Yilei Li,Qing Zhao,Yang Zhang,Yunchao Li,Louzhen Fan,Fa-tang Li,Xiaohong Li
Photocatalysis has been facing challenging problems especially the inefficient photocarriers transfer at the interfaces. Here, based on K sp difference, we prepare the sequential heterojunction of CoS/CdS/CuS via sequential cation exchange strategy, and propose the concept of "electron-welcome zone", where the point-to-point contact can be formed at the interface, thus providing continuous electron transport channels. HAADF-STEM EDS line test indicates the formation of designed structures, and the p/n junction is confirmed by band structure and Mott-Schottky analysis. Theoretical calculation indicates that CoS reduces the Gibbs free energy of the reaction. TRPL spectra show that the existence of "electron welcome zone" greatly improves the lifetime of electrons. This sequential structure enable the optimal H 2 production rate to reach 123.2 mmol g −1 h −1 with AQE of 45.6%, which is among the highest values of CdS-based photocatalysts. This work opens new way to efficient photogenerated carrier transfer channel for solar-energy conversion.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Ziqiang Zheng,Ting Wang,Fang Han,Qing Yang,Benxia Li
The development of visible light responsive photocatalysts for simultaneous production of hydrogen (H 2 ) fuel and value-added chemicals is greatly promising to solve the energy and environmental issues by improving the utilization efficiency of solar energy. Herein, the three-component Ni/(Au@CdS) core–shell nanostructures were constructed by the hydrothermal synthesis followed with photodeposition. The intimate integration of plasmonic Au nanospheres and visible-light responsive CdS shells modified with Ni cocatalyst facilitated the generation and separation of electron-hole pairs as well as reduced the overpotential of hydrogen evolution. The Ni/(Au@CdS) photocatalyst exhibited excellent performance toward the selective transformation of benzyl alcohol under anaerobic conditions, and the yields of H 2 and benzaldehyde reached up to 3882 and 4242 μmol·g −1 ·h −1 , respectively. The apparent quantum efficiency (AQE) was determined to be 4.09% under the irradiation of 420 nm. The systematic studies have verified the synergy of plasmonic effect and metal cocatalyst on enhancing the photocatalysis. This work highlights the desirable design and potential application of plasmonic photocatalysts for solar-driven coproduction of H 2 fuel and high-value chemicals.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 1
·217-222
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IF 3.288
Chao Zhang,Xi Cheng,Baoquan Liu,Zhenmei Guo,Guangxiang He,Zhiguo Lv
Hexagonal wurtzite CdS has been regarded as one of the most promising semiconductors for photocatalysis. However, its water splitting performance under visible-light irradiation is seriously limited due to the high charge carrier recombination. In order to solve this limitation, we facilely prepared 2D hexagonal wurtzite CdS nanoplates (HWCs) with exposed (110) and (112) crystal facets via a water bath strategy. The visible-light responsivity of the HWCs exhibited an obvious red shift and, accordingly, the band gap was narrowed from 2.31 to 2.12 eV. Besides, the HWCs showed an excellent visible-light H2 evolution rate of ca. 6214.5 μmol h−1 g−1 without cocatalysts due to the enhanced charge carrier separation between the (110) and (112) crystal facets. Finally, a possible photocatalytic mechanism for HWCs was tentatively proposed. This work will be beneficial for designing and fabricating powerful mono-component photocatalysts.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2020
·Vol. 35
·期 1
·99-106
·
IF 0.64
Su Junzhang,Wu Xiangfeng,Zhang Chenxu,Wang Hui,Zhang Mi,Zhang Jiarui,Jia Yunning,Cui Yanan,Tong Xin,Shang Jialu,Zhang Chenyu
The CdS/ spherical g-C 3 N 4 n-n heterojunction photocatalyst was fabricated via a solvothermal method. The tetracycline was used to characterize the photocatalytic properties of the as-developed hybrids. The photocatalytic degradation mechanism of the as-developed heterojunction photocatalyst was also analyzed. Research results show that CdS nanoparticles are well dispersed in the surface layer of spherical g-C 3 N 4 . Moreover, the mass ratio of CdS to spherical g-C 3 N 4 will influence the photocatalytic activity of the asdeveloped composites, which shows the trend of first increasing and then decreasing as it increased. When the mass ratio is 7:1, in 25 min, the as-developed heterojunction shows 93.2 % of the maximum photocatalytic efficiency and still exhibits 83.6 % after 5 times cycle testing. Moreover, the as-developed hybrids can accelerate the electron transport and improve the separation efficiency of photo-generated carriers compared with pure samples. In addition, the holes and superoxide radicals are dominating active species during the photocatalytic degradation process.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Zhiping Yan,Wenchao Wang,Lili Du,Jixin Zhu,David Lee Phillips,Jingsan Xu
Heterojunctions of CdS quantum dots (QDs)/TiO 2 nanotube arrays (NTAs) were synthesized via a simple vapor transport approach. The 0D/1D QDs/NTAs electrodes exhibited 5-fold improvement efficiency for photocatalytic dye degradation and hydrogen evolution compared to pure TiO 2 NTAs in a photoelectrochemistry cell, which was attributed to the faster transportation and retarded recombination of electron-hole pairs in the 0D/1D heterostructures. Femtosecond transient absorption offers deep insights into the dynamics of the charge carriers, showing that surface-trapped electrons were generated within 1.2 ps. The lifetimes for recombination of electrons at shallow trap sites with holes and deep trapped electrons with holes are prolonged to 73.2 ps and 622.6 ps, respectively. The reduced charge transfer resistance is verified by electrochemical impedance spectroscopy. Mott-Schottky plots indicated downward shifts for both the conduction band and valence band in the heterostructure. Finally, a Z-scheme photoreactive mechanism is proposed to explain the enhanced catalytic activities.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Huaji Pang,Yunhong Jiang,Wensheng Xiao,Yanhuai Ding,Cai Lu,Zhanpeng Liu,Ping Zhang,Hean Luo,Wei Qin
g-C 3 N 4 and CdS have attracted intense attention in the field of energy and environment research. Cubic-phase CdS possesses a smaller bandgap than that of hexagonal CdS but has seldom been used as photocatalytic material. This work focuses on the photocatalytic H 2 generation of few-layer g-C 3 N 4 nanosheets (CNS) anchored with cubic-phase CdS nanocrystals (CNS–CdS). The CNS–CdS composites were synthesized by depositing cubic-phase CdS on the surface of CNS in a sulfur-rich solution. Owing to the large specific surface area, rich active sites and strong synergy between cubic CdS and g-C 3 N 4 nanosheets, the CNS–CdS showed the enhanced light absorption and separation of the photo-generated carriers, which endowed it with superior H 2 generation activity and stability. The optimal average hydrogen production rate of the CNS–CdS photocatalyst reached to 2.24 mmol∙h −1 ·g −1 under irradiation of AM 1.5G, which was 3.5 and 3.3 times of that of cubic CdS and few-layer g-C 3 N 4 nanosheets, respectively. The best apparent quantum efficiency at 475 nm reached up to 13.83%, and the maximum conversion efficiency of incident photon-to-current is 59.6% in the wavelength range of 350–700 nm. The excellent stability of the as-prepared CNS–CdS was also proven by the cyclic run. The results suggest the replacement of hexagonal CdS with cubic CdS result in energy-saving, performance-stable and high-efficient photocatalytic materials.
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