Advanced Sustainable Systems
·
2026
·Vol. 10
·期 2
·e00001
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IF 5.6
Aohui Ping,Mei Li,Lu Ding,Meijuan Ding,Ziyu Li,Jingyi Nie,Xianglong Lyu,Chaoqi Ding,Youji Li,Zhiliang Jin
In order to investigate the influence of the ohmic junction formed at the interface between the bimetallic sulfide NiMnS and maple-leaf CdS on photocatalytic hydrogen evolution performance, this work employed a simple hydrothermal method to synthesise maple-leaf CdS and granular NiMnS. The optimized composite material (15NiMnS/CdS) achieved an exceptional hydrogen evolution rate of 34.83 mmol·g −1 ·h −1 under visible light illumination within 5 h, surpassing the rates of CdS alone and NiMnS alone by 5.44-fold and 530.70-fold, respectively. The superior photocatalytic hydrogen evolution performance originates from the fact that the Fermi level of the metal-like catalyst NiMnS is higher than that of the semiconductor catalyst CdS. This allows the two to form an ohmic junction after contact, creating a strong electronic coupling interface. Electron enrichment occurs at CdS, which inhibits electron–hole recombination and enables electrons to engage in the photocatalytic process efficiently, thus improving its photocatalytic hydrogen evolution ability. The incorporation of NiMnS co-catalyst increased the CdS charge separation efficiency from 18.67% to 68.16%, thereby improving the catalyst's reaction kinetics and enhancing the photocatalytic hydrogen generation rate. This study presents an example of engineering transition-metal sulfide-based Ohmic-contact structures and enhancing photocatalytic hydrogen evolution performance through strong electronic coupling.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
·
IF 9.2
Ermiao Liang,Wenbo Cui,Ke Cheng,Mingcong Xu,Sha Luo,Chunhui Ma,Zhijun Chen,Yahui Zhang,Shouxin Liu,Wei Li
Here, CdS/ZnS/Pt (CZP), Zn 0.4 Cd 0.6 S/ZnS/Pt (ZCSZP), and CdS/ZnS/1T-WS 2 /CNTs (CZWC) composites are constructed through co-catalyst modification and heterojunction engineering strategies. The CZWC-10 with an innovative structure exhibits the optimal photocatalytic hydrogen production performance (37.83 mmol/g/h) for lactic acid, while the CZP photoreforming of cellulose achieves yields of 13.22 and 5.27 mmol/g/h for hydrogen and formic acid, respectively. 1T-WS 2 /CNTs not only exposes more active sites but also expands the photoresponse range. The synergistic effect of the built-in electric field within the heterojunction of ZnS/CdS and the co-catalysts (1T-WS 2 /CNTs and Pt) enables the spatial separation and directed aggregation of photogenerated charge carriers, thereby simultaneously triggering redox half-reactions. The formation of heterojunctions reduces the Δ G H∗ value at the S site in 1T-WS 2 and is smaller than the absolute value of Δ G H∗ at the Pt site in CZP, thereby promoting hydrogen formation. This study provides insights for rationally designing photocatalysts to achieve highly efficient photoreforming reactions.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2022
·
IF 5.141
Hao Zhang,Hongjie Zhu,Haitao Zhao,Mingyu Dou,Xingliang Yin,Hua Yang,Dacheng Li,Jianmin Dou
Photocatalytic water splitting to produce hydrogen has gradually become a research hotspot in recent years, and molecular cocatalysts especially cobalt-based complexes as proton reduction cocatalysts have attracted wide attention due to their high activity and selectivity. In this study, CdS nanorods were employed as photosensitizers, and a novel dinuclear cobalt-bis(thiosemicarbazone) complex with definite structure was used as a cocatalyst to improve visible-light-driven hydrogen evolution. Under the optimum conditions, this noble metal-free system exhibited an average hydrogen evolution rate of 1045 μmol·h −1 in 8 h irradiation. This system could work for 24 h with a TON of 16,400, and the average apparent quantum yield of this system is ∼21% at 420 nm. On the basis of photoelectrochemical studies and electrochemical analysis, we proposed a possible mechanism for hydrogen production in this three-component system.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Wenyuan Li,Xiaoting Yu,Ying Tang,Zian Li,Syed Jalil Shah,Yuying Liu,Hanqing Zhao,Mingxin Song,Junjie Li,Guanchen Wang,Liqin Zhou,Zhongxing Zhao,Suya Liu,Zhenxia Zhao
Fabrication a reusable and highly sensitive fluorescence sensor in a controllable manner for water detection in solvents and humidity remains a top priority target yet a challenging task. In this work, carbon dots (CDs) are successfully implanted into confined metal–organic framework MIL-101(Cr) cages via “ship in the bottle” strategy and the confined CDs are firstly observed in MIL-101(Cr) cage showing high dispersion and high N content by advanced iDPC STEM technique. The highly selective water capture and sensitive changes of the fluorescence property with solution polarity and hydrogen-bonding donor acidity efficiently enhance the detection sensitivity and realize reusable turn-on detection based on the adsorption-solvent synergistic mechanism. Consequently, CDs@MIL-101 exhibits high sensitivity (detection limit: 0.036% and 0.028% v/v), wide response range (0.04–100% and 0.03–45%) and reusable stability for liquid water detection in acetone and tetrahydrofuran , respectively. Meanwhile, it can also detect gaseous water and the detection range is 23% to 85%. The analysis of real samples confirms the proposed method. Such construction strategy and detection mechanism will offer guidance for optimizing and expanding the detection performance of CDs, which is of great significance in the design and construction of novel multiphase sensors.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhibin Qiu,Yumin Li,Xuejun Long,Hong Tian,Yuanmao Pu,Bing Lv,Jun Wei,Qingping Dai,Wenzhong Wang
Cadmium sulfide (CdS), as a prospective photoelectrochemical (PEC) photoanode material, has been restrained in hydrogen production owing to the severe recombination of charge carrier and the inherent photocorrosion. Herein, a thin shell consisted of cuprous sulfide (Cu 2 S) nanoparticles was formed on CdS nanorods arrays to overcome the shortages. An all-sulfide heterojunction not only establishes close interface and p-n junction between two semiconductors, but also possesses additional S atom channel for charge carrier migration, all beneficial for the efficient separation of photogenerated electrons/holes. In consequence, the transient photocurrent density of CdS/Cu 2 S reaches to 4.95 mA/cm 2 under simulated sunlight with zero bias-potential, 1.4-fold of the pristine CdS. The excellent PEC performance results from the type-II band alignment and built-in electric field in heterojunction. Additionally, by the density functional theory, the calculated work function and band structure of CdS/Cu 2 S heterojunction gave strong evidences for the type-II charge transfer mechanism, and the established built-in electric field between p-n junction accelerated transfer and separation of photogenerated charge carriers.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Xiaobo Zhang,Zhiru Li,Lili Yang,Bing Hu,Qiuyue Zheng,Jiang Man,Jijuan Cao
The sensitive and accurate detection of ochratoxin A (OTA) is crucial for public health due to its high toxicity. Herein, using Au nanoparticle (NP)-attached CdS/UiO-66-NH2 heterostructures as photoactive materials, a photoelectrochemical (PEC) aptasensor was presented for the ultrasensitive assay of OTA based on a competitive displacement reaction triggering the trans-cleavage ability of CRISPR/Cas12a. In this sensing strategy, methylene blue-labeled single-stranded DNA (MB-ssDNA) was immobilized on the Au NPs/CdS/UiO-66-NH2 electrode to accelerate the separation of the photogenerated carrier, thus producing a significantly increased PEC response. In the presence of OTA, it specifically bound with the aptamer (Apt) and resulted in the release of the activation chain, triggering the trans-cleavage characteristics of CRISPR/Cas12a. MB-ssDNA was cut randomly on the electrode surface to convert the PEC signal from the “on” to the “off” state, thereby achieving a quantitative and accurate detection of OTA. The CRISPR/Cas12a-derived PEC aptasensor exhibited excellent sensitivity and specificity, with a linear range from 100 to 50 ng/mL and a detection limit of 38 fg/mL. Overall, the proposed aptasensor could provide a rapid, accurate, and sensitive method for the determination of OTA in actual samples.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
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IF 4.291
Chang Feng,Zhuoyuan Chen,Jiangping Jing,Mengmeng Sun,Jing Han,Ke Fang,Weibing Li
Hierarchical structure can significantly increase the reactive sites and provide advantages for heterojunction engineering in the field of photocatalysis. However, it is still a great challenge to realize efficient photocatalytic hydrogen production by controlling the band structure and constructing Z-scheme heterojunction system based on the hierarchical photocatalyst. In this paper, a CdS/Co 9 S 8 Z-scheme heterojunction system was prepared by depositing CdS nanoparticles on nanoflower-structured Co 9 S 8 hierarchical photocatalyst, which showed enhanced photocatalytic hydrogen production performance. The photocatalytic hydrogen production rate of the CdS/Co 9 S 8 Z-scheme heterojunction system is 11.60 mmol g −1 h −1 , which is 13.6 and 55.2 times that of CdS and Co 9 S 8 , respectively. The synergistic effect of the hierarchical structure and the Z-scheme heterojunction makes the photogenerated charge carriers quickly and efficiently transfer to the surface of the photocatalyst, which accelerates the photocatalytic hydrogen production process.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2020
·
IF 5.647
Yuxiang Xue,Qianqian Chang,Xinyu Hu,Jun Cai,Hu Yang
Resource utilization of wastes through effective separation is a major challenge in the field of water and wastewater treatment . Photocatalytic degradation is a powerful water treatment technology but has no selectivity in degradation of various coexisting contaminants due to its strong oxidation . In this work, a complex film composed of CdS and carboxylmethyl starch (CdS/CMS) was designed and fabricated using in situ formation method. The morphology, composition, and optical property of this film were investigated in detail by various characterization methods. CdS was well distributed in the starch matrix, and the absorption wavelength of this film was still located in the visible light region. This starch-based complex film was used to remove various organic dyes [methylene blue (MB), crystal violet (CV), and rhodamine B (RhB)] from aqueous solutions by two consecutive processes of adsorption enrichment and photocatalysis degradation. 0.1 g of CdS/CMS film can remove approximately 86.72% of MB and 81.03% of CV in 120 min. CdS/CMS still exhibited evidently selective photocatalysis degradation of MB and CV in MB/RhB and CV/RhB binary systems, respectively, and had nearly no effect on RhB. The cationic groups on MB and CV can effectively interact with negatively carboxyl groups of CMS via electrostatic interactions, causing their good affinities; but the anionic groups on RhB had an electrostatic repulsion to the starch matrix. The considerably different affinities of various dyes to CMS triggered strong adsorption preferences and great selective degradation effectiveness. The selectivity of CdS/CMS could not be influenced by pH and some coexisting inorganic anions. Furthermore, this complex film did not require regeneration and could be reused directly with low removal capacity loss. Therefore, a new and simple strategy was provided to realize the effective separation and recovery of target contaminants in water by photocatalytic degradation technology.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Kuanxia Ma,Lushan Liang,Xie Zhou,Weiguo Tan,Ou Hu,Zuanguang Chen
We develop a simple hydrothermal method to prepare a novel nitrogen-doped carbon dots (N-CDs) originated from green carbon source Liu-bao tea and ethylene diamine. The N-CDs emits strong and stable blue fluorescence (E m = 440 nm) under the excitation wavelength of 350 nm with a quantum yield of 35%. And it is used as an excellent fluorescent output for the sensitive and visual dual-mode determination of isoniazid. The fluorescence of N-CDs is “turned off” first by manganese dioxide (MnO 2 ) nanosheets due to inner filter effect, MnO 2 nanosheets can also oxidize TMB (3,3',5,5'- tetramethylbenzidine) to blue oxTMB. Isoniazid, however, can reduce MnO 2 nanosheets to Mn 2+ , turning on the fluorescence again. The color of the solution fades from blue to colorless because less TMB can be oxidized. Under the optimal conditions, the dual-mode method has a satisfying linear relationship ranging from 2.0 to 120.0 μM with a limit of detection of 0.7 μM (S/N = 3). And it has been applied successfully to colorimetric and fluorescent determination of isoniazid in tablets and clinical plasma samples, with recoveries ranging from 94.0% to 102.4%. The properties of N-CDs and MnO 2 nanosheets were thoroughly characterized using TEM, FT-IR, XPS, AFM and fluorescence spectrophotometer, the quenching mechanism was also discussed.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Jun-Tao Cao,Yu-Xiang Dong,Yan Ma,Bing Wang,Shu-Hui Ma,Yan-Ming Liu
Photoactive materials with high photo-electron transfer efficiency and stable signal output hold a key role in constructing the photoelectrochemical (PEC) biosensing systems. In this study, the ternary [email protected] 3 N 4 heterojunction was first prepared and characterized, and its application in PEC bioanalysis was explored. The gold nanoparticles sandwiched between CdS and g-C 3 N 4 , acting as both plasmonic photosensitizer and electron relay, significantly boosted the light absorption and accelerated the charge transfer from g-C 3 N 4 to CdS, both of which contributed to the enhancement of photoelectric conversion efficiency. Signal quenching with graphene oxide-CuS efficiently weakened the photocurrent from [email protected] 3 N 4 . The combination of the excellent PEC properties of [email protected] 3 N 4 and the remarkable quenching effects of graphene oxide-CuS enabled construction of a sandwich-type PEC immunosensor for prostate specific antigen (PSA) detection. This immunosensor achieved sensitive PSA analysis by multiple signal amplification mechanisms, with a detection limit of 0.6 pg mL −1 and a wide linear range from 1.0 pg mL −1 to 10 ng mL −1 . This work not only demonstrates the great potential of noble metal sandwiched ternary heterojunctions in the PEC field, but also lays a foundation for developing the general PEC immunoassays .
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Lei Chen,Bo Yang,Peng Zhou,Tao Xu,Chao He,Yuanting Xu,Weifeng Zhao,Changsheng Zhao
Ultrafiltration membranes are usually used to remove organic pollutants . However, the organic contaminants trapped in the membrane pores and on the membrane surface would limit the reuse of membranes. In this study, polyacrylic acid grafted polyethersulfone membrane was prepared; CdS was then generated in-situ on the membrane surface by subsequently immersing the membrane in Cd 2+ and S 2− solutions to fabricate photocatalytic composite membranes . Scanning electron microscopy and X-ray photonic energy spectroscopy revealed that the generated CdS were uniformly deposited on the surface of the membrane. The obtained membrane could effectively chemisorb rhodamine B (RhB) dye in dark, and show good photocatalytic degradation performance for RhB under visible irradiation. Meanwhile, the received membranes exhibited enhanced photocatalytic degradation performance compared with the membrane prepared by blending doping method, and displayed better removal performance (77.8 %) in the pH = 7 and low concentration (10 mg/L) RhB solution. Moreover, the degradation and removal ratio could still be stable at over 70 % after 3 cycles. In addition to degrading RhB, the composite membrane also exhibited good photocatalytic degradation for antibiotic organic pollutants. Then, free radical capture experiments showed that the photocatalytic degradation of the membrane was mainly derived from the superoxide anion free radicals. Besides, the prepared membrane also exhibited excellent RhB rejection and fast photocatalytic self-cleaning performances under visible light. Thereby, the photocatalytic composite membrane effectively solved the problem of the easy fouling of ultrafiltration membrane, and showed high potential applications in wastewater remediation.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Nian Cao,Faqiong Zhao,Baizhao Zeng
In this work, a novel self-enhanced solid state electrochemiluminescence (ECL) platform, based on polyethyleneimine (PEI) capped CdS quantum dots (PEI-CdS QDs) as coreactant and [email protected] 2 @Ru(bpy) 3 2+ doped silica ( [email protected] 2 @RuDS) nanocomposite as ECL emitter, was constructed. The PEI-CdS QDs integrated double coreactant of PEI and CdS QDs, thus significantly promoted the ECL of [email protected] 2 @RuDS. Polyaniline hydrogel was introduced to boost the electron transfer and to improve the immobilization of PEI-CdS/ [email protected] 2 @RuDS. In addition, creatinine imprinted poly(o-aminophenol) film was electrodeposited on the PEI-CdS/ [email protected] 2 @RuDS surface as recognition element. Thus, the obtained sensor possessed high sensitivity, stability, reproducibility and selectivity for creatinine sensing. The change of ECL intensity and logarithm of creatinine concentration showed a good linear relationship in the range of 0.05 nM to 5 μM, and the detection limit was low to 0.02 nM. The sensor was applied to detect creatinine in human serum and urine samples, and the results were in good agreement with those of commercial enzyme-linked immunosorbent assay kit.
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