JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Hao Zhang,Guang Yang,Yan Sun,Shirong Kang,Mingyu Dou,Hua Yang,Dacheng Li,Jianmin Dou
A heterocycle 2,5-bis(2-pyridyl)-1,3,4-thiadiazole (bptd) as a polydentate reacts with CoCl 2 ∙6H 2 O and NiCl 2 · 6H 2 O to form two novel monomeric complexes, [Co(bptd) 2 Cl 2 ]∙4H 2 O ( 1 ) and [Ni(bptd) 2 Cl 2 ]∙4H 2 O ( 2 ). The complex 1 can act as electron cocatalyst to improve the rate of hydrogen evolution of CdS NRs under visible light irradiation . After the introduction of cobalt lactate complex as a hole cocatalyst, this noble-metal-free system exhibited a hydrogen evolution rate of 1123 μmol h −1 , which is 12.2 times higher than that of pure CdS NRs. This system could work for 50 h with a TON of 7490, and the average AQY is 17% at 420 nm. Based on the results of experiments, the synergistic effect of complex 1 and cobalt lactate complex is proved and a possible mechanism for hydrogen production is proposed. This work may provide a reference for remedying the defects of faster carrier recombination and photocorrosion of CdS in heterogeneous environment.
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CATALYSIS LETTERS
·
2023
·
IF 2.8
Su Zheng,Sun Yu,Zhang Qi,Wang Jia,Zhou Wenqi,Zhou Suyin,Zhang Jinlong,Liu Yongdi,Zhou Liang,Lei Juying
Photocatalytic cofactor regeneration often encounters the problem of insufficient stability of reduced nicotinamide adenine dinucleotide hydrogen (NADH) regeneration due to the influence of reactive oxygen species. Here, we obtained Pt-loaded CdS nanorods (CdS NRs) with a one-dimensional (1D) rod-like structure by simple hydrothermal and photo-deposition methods. The yield of NADH improved by 52.54% within 40 min. Superoxide radical (·O 2 − ) had been proven to be the main reactive species that leaded to unwanted oxidation after NADH regeneration. After loading Pt, the formation of Schottky junctions between Pt and CdS NRs promoted the separation and migration of photogenerated carriers, resulting in a tendency of ·O 2 − to shift toward hydroxyl radical (·OH). ·OH produces additional intermediates in the oxidation of NADH compared to ·O 2 − , which inhibits the unwanted oxidation of NADH. Meanwhile, the conduction band position of Pt/CdS shifted positively and the ability to reduce O 2 was weakened, thus the ·O 2 − in the system was reduced, which weakened the oxidation of NADH and significantly improved the stability of NADH regeneration. These studies provide a new reference for applying loaded metal catalysts to the stable regeneration of NADH. Graphical Abstract
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Ruyan Xie,Yanhua Song,Fangke Wang,Jingyao Li,Xiaozhen Zhang,Haifeng Zou
Ultrasensitive detection and degradation of tetracycline (TC) has gained increasing attention owing to their inevitable detriments to human and ecosystem. Many studies have focused on mono-functional detection or degradation. However, the design of multi-functional materials is still a challenge. Till now, a novel protocol applied to the consecutive detection and complete degradation of TC are rarely successfully reported. Herein, we not only developed a multi-mode optical carbon dots (CDs) for ultra-sensitive sensing, but also further manufactured CDs/TiO 2 photocatalyst that can degrade TC 100 %, completely eliminating the TC for the first time. The as-prepared CDs can selectively detect TC with low detection limit of 5.2 nM and 10.7 nM within only 40 s, accompanied by wide linear interval of 1.0–50.0 μM and 50.0–250.0 μM, respectively. Therefore, the fabricated point-of-care testing platform can realize “in-situ” visual detection rapidly and efficiently. Furthermore, a highly active CDs/TiO 2 photocatalyst was prepared by rationally modifying CDs on TiO 2 and exhibited almost 100 % degradation behavior towards TC within 70 min. The mechanism of fluorescence quenching and photocatalysis were lucubrated. Notably, our proposed protocol can drive consecutive detection and elimination towards tetracycline, which powerfully reduces the potential harm and provides a new strategy for the eradication of pollutants.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Wenhao Yuan,Jie Zhou,Mingyue Jiang,Qingfeng Sun,Gaoyuan Ye,Xiaochun Zhang,Hongjie Bi
The development and comparison of latent fingerprint (LFP) are crucial for the detection and identification of LFP. However, research on stable, clear, and no background interference’s fluorescent materials for LFP recognition are scarce. In this study, lignin-derived carbon dots (CDs) with orange red emission were synthesized and combined with polyvinyl alcohol (PVA) matrix for identification of LFP and ink-free printing. The physicochemical and microstructure of the CDs and CDs/PVA nanocomposite have been precisely elucidated by TEM , FT-IR, XPS , SEM , and TGA to verify the reaction of CDs with PVA forming hydrogen bonds. The effect of CDs on the mechanical properties of PVA nanocomposite was studied. The tensile strength and elongation at break of PVA nanocomposite were increased by 113.01 % and 175.26 %, respectively. The shape memory and fluorescence properties of CDs/PVA nanocomposite were studied under different conditions such as water, acid, alkali and heat. The fluorescence intensity of CDs/PVA nanocomposites was enhanced due to the deprotonation of CDs surface under alkaline conditions. By coating CDs/PVA solution on LFP, a stable fluorescent fingerprint with clear ridge details was formed on the composite film, and it is applied to letterpress printing and gravure printing, enabling personal identification and ink-free printing. Obviously, the nanocomposite film prepared herein has multiple functions, providing potential for the design and manufacture of advanced all-round personal information identification and encryption applications in extremely harsh high temperature and strong alkaline environments.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Xinlei Zhang,Fei Wu,Guicun Li,Lei Wang,Jianfeng Huang,Alan Meng,Zhenjiang Li
Photocatalytic water splitting is a prospective approach to address the energy and environmental challenges. Herein, an amorphous Ni@NiS x cocatalyst has been fabricated and simultaneously assembled onto CdS to form amorphous-crystalline Ni@NiS x -CdS photocatalyst via a partial reduction strategy. Comprehensive experiments and theoretical calculations demonstrate that the synergistic effects between the electronic coupling of amorphous-crystalline interface and the gradient work function variation induced by Ni nanocluster encapsulation achieve the deeper downshift of the S p-band center to optimize H* intermediate adsorption, enhance charge extraction ability though Schottky junction and lower H* adsorption Gibbs free energy (ΔG H* ). Accordingly, the optimal Ni@NiS x -CdS photocatalyst delivers a remarkable photocatalytic H 2 production rate of 78.7 mmol·g −1 ·h −1 with an apparent quantum efficiency (AQE) of 36.74% at 420 nm, which is approximately 18.3 and 1.5 times than that of CdS and NiS x -CdS, respectively. This work offers a novel insight into the development of amorphous nanocomposite cocatalysts for promoting solar-to-H 2 energy conversion.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Hao Zhang,Fan Yu,Yong Wang,Lixiong Yin,Jiayin Li,Jianfeng Huang,Xingang Kong,Qi Feng
CdS has suitable band gap and high photoelectric conversion efficiency, which has attracted widespread attention. However, its severe photocorrosion and low photocatalytic activity limits its application. Generally, constructing heterojunction structure can effectively improve the separation efficiency of CdS photogenerated carriers, and its photocatalytic activity and stability can be further improved. Here, we prepared CdS hexagonal pyramid single crystal with co-exposed {0001} and {10 1 ¯ 1} crystal planes by the urothermal method. Type II heterojunction can be formed between {0001} and {10 1 ¯ 1} crystal planes, which can effectively improve the photocatalytic hydrogen production activity of CdS hexagonal pyramid. The photocatalytic hydrogen production activity of CdS hexagonal pyramid is 10.64 mmol·h -1 ·g -1 with an apparent quantum efficiency of 15.6% at 420 nm, which is 5.8 times and 13.2 times as high as CdS nanorod and CdS nanoparticles, respectively. Even after the 100 h cycle test, the CdS hexagonal pyramid shows still high photocatalytic activity. This work showed that the photocatalytic activity can be effectively improved by adjusting the crystal faces, which can further generaliza to other photocatalysts.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 16
·5205-5218
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IF 4.174
Xiaoyi Chen,Xiuling Xue,Xiuwen Gong
A number of porous g-C3N4 nanosheet/Ag3PO4/NCDs (PCNNS/AP/NCDs) with little amounts of Ag3PO4 were synthesized via an in situ sedimentation–calcination method. The PCNNS/AP/NCDs photocatalyst exhibited excellent photocatalytic performance for the photocatalytic degradation of tetracycline (TC) under visible light irradiation at a removal rate of 90.5% in 40 min. The study of the reaction kinetics of the as-prepared samples was in accordance with the pseudo-second-order kinetics, with the correlation coefficient (R2) being greater than 0.9776. Meanwhile, the photocatalyst was capable of degrading ciprofloxacin (CIP), and showed good performance even under actual water conditions with natural sunlight irradiation, indicating that the photocatalyst has wide practical applications. In addition, the photocatalytic performance and the XRD and FTIR spectra showed no obvious changes even after four photocatalytic degradation cycles, which revealed the high stability of the PCNNS/AP/NCDs photocatalyst. Furthermore, the possible degradation pathways of TC and the possible Z-scheme mechanism were proposed with ˙O2− and h+ as the main active species contributing to photocatalytic degradation. The results provide a novel insight into the fabrication of Z-scheme PCNNS/AP/NCDs and introduce them as an efficient visible-light-responsive photocatalyst for use in practical applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Jiayan Xue,Lizhen Long,Lin Zhang,Hongtian Luo,Li Yang,Fuchi Liu,Fengzhen Lv,Wenjie Kong,Jun Liu
Synergistic the modulation of photon absorption capability and interfacial charge transfer of the photocatalyst are highly required for developing high-performance heterojunction photocatalysts. The ternary CdS-graphene quantum dots-titanate nanotubes (CdS-GQDs-TNTs) nanocomposite have been prepared by an in situ growth method. The physicochemical characterization reveals that the GQDs are firmly decorated on both inner and outer surface of TNT through the formation of Ti–O–C chemical bonding, and CdS QDs are loaded on the outer surface of TNTs through strong interfacial interaction . The intimate integrated CdS-GQDs-TNTs nanocomposite exhibits much superior photocatalytic performance toward H 2 production compared with binary GQDs-TNTs and pure TNTs photocatalyst, which can be attributed to the combined interaction of the stronger visible light harvesting, the longer lifetime of photogenerated electron−hole pairs, faster interfacial charge transfer rate, fast and long-distance electron transport pass. The interfacial charge transfer mechanism of CdS-GQDs-TNTs ternary composite are proposed based on photoelectrochemical measurements.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-8
·
IF 5.479
Kong Weisu,Tan Qingqing,Guo Haiyu,Sun Han,Qin Xia,Qu Fengli
A method is described for photoelectrochemical determination of the activity of alkaline phosphatase (ALP). It employs an indium tin oxide (ITO) electrode modified a CdS quantum dots@graphene (CdS@GR) composite and hexagonal cobalt oxyhydroxide (CoOOH) nanosheets. The CdS@GR nanocomposite was synthesized by assembling the CdS quantum dots onto a GO film to receive a basic photocurrent response of the ITO. This is further improved by covering it with CoOOH nanosheets. Secondly, 2-phospho-L-ascorbic acid (AAP) is added as a substrate for ALP. Its hydrolysis yields ascorbic acid which reduces CoOOH to form cobalt(II) ion. As a result, the CoOOH nanosheets decompose. This is accompanied by a reduction of the photocurrent. The effect was used to design a selective and sensitive assay of determination of the activity of ALP. Under the optimized experimental conditions, response is linear in the 10 to 300 U·L −1 ALP activity range. The detection limit is 1.5 U·L −1 at a signal-to-noise ratio of 3.
Indium tin oxide (ITO) was coted with CdS@graphene and CoOOH to obtain a material with superior photoelectrochemical properties. The detection of alkaline phosphatase (ALP) was accomplished by using 2-phospho-L-ascorbic acid (AAP) which is hydrolyzed by ALP to release ascorbic acid (AA) which reduces CoOOH to Co 2+ .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 10
·9363-9371
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IF 2.195
Xue Xiangxin,Chen Lei,Zhao Cuimei,Wang Hairui,Nie Ping,Chang Limin
In this paper, the photocatalytic behavior of CdSe/CdS quantum dots (QDs) in reducing the graphene oxide (GO) with different surface ligands was investigated. Here, three surface ligands of different functional groups (oleic acid, poly (acrylic acid polymers) and S 2− ) were selected to study the influence of surface ligands on photocatalytic behavior of the CdSe/CdS QDs. Meanwhile, the obtained samples can be used as photocatalyst, and the photocatalytic activity was evaluated by photodegrading a methylene blue solution. It turned out that the QDs–S 2− –GO sample showed the highest photocatalytic activity under visible-light irradiation. Different surface ligand has different influence on the charge separation efficiency, which has different influence on photocatalytic behavior. The results show that the photocatalytic behavior is highly dependent on the electron attracting ability of the surface ligands on the CdSe/CdS QDs. Finally, a possible photocatalytic mechanism is proposed.
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ChemPlusChem
·
2018
·Vol. 83
·期 12
·1088-1096
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IF 3.205
Ping Wang,Chuanping Li,Minmin Wang,Yongdong Jin
Graphical Divalent nickel can be decorated onto CdS/CdSe core/shell quantum dots (QDs) in a controlled fashion. Under optimized conditions these QDs catalyze light-induced H 2 evolution from water with a turnover frequency of 322 h −1 with respect to Ni and a quantum yield of 12.3 % at 520 nm. The search for a low-cost, noble-metal-free cocatalyst to replace expensive Pt for hydrogen (H 2 ) photogeneration in water has become a hot research topic, and among these, Ni-based cocatalysts are promising and highly desired. Developing new strategies and protocols to obtain Ni-based cocatalysts with high activity is therefore vitally important. Herein, we develop a new method to efficiently decorate divalent Ni onto pre-synthesized CdS/CdSe core/shell quantum dots (QDs). The concentration of Ni on the QDs can be easily tuned by varying the amount of the Ni precursor introduced during the synthesis. Further analyses reveal that Ni 2+ can be strongly decorated onto QDs. Impressively, the Ni-decorated QDs displayed a significantly enhanced H 2 photogeneration performance as compared to the two components prepared separately. Through the optimization of the Ni concentration on the QDs, the turnover frequency (TOF) with respect to Ni and quantum yield ( ) at 520 nm for H 2 evolution from water could reach 322 h −1 and 12.3 %, respectively. A possible mechanism has also been proposed and discussed in detail.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Fang Deng,Xiaoying Lu,Yingbo Luo,Jie Wang,Wenjie Che,Ruijie Yang,Xubiao Luo,Shenglian Luo,Dionysios D. Dionysiou
A series of visible-light-driven direct Z-scheme CdS/CuInS 2 nanoplates were fabricated by a facile one-step hydrothermal method, and the molar ratio of CdS to CuInS 2 was optimized. The highest visible-light photocatalytic degradation activity of Z-scheme (1:0.03) CdS/CuInS 2 heterojunction is about 4 times than that of pure CuInS 2 , which is due to the narrowest band gap, the largest BET surface area, the most efficient charge separation and transfer, and the synergistic effect between CdS and CuInS 2 . Meanwhile, Z-scheme (1:0.03) CdS/CuInS 2 heterojunction also exhibits excellent photocatalytic reduction activity with almost 100% of aqueous Cr(VI) reduction efficiency in absence of hole scavengers after 60 min. The special significance is that Z-scheme (1:0.03)CdS/CuInS 2 heterojunction shows excellent stability in five degradation cycles, and can effectively treat real pharmaceutical wastewater with 76.5% COD removal efficiency with aid of H 2 O 2 in 13 h, indicating that Z-scheme CdS/CuInS 2 has a promising prospect in real pharmaceutical wastewater treatment.
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