Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 15
·3745-3751
·
IF 4.696
Yu Cang,Rui Zhang,Guixin Shi,Jianchao Zhang,Lixiao Liu,Xiaoyan Hou,Zhenchuan Yu,Dingye Fang,Xuhong Guo
In this work, we demonstrated a facile and environmentally friendly method of preparing water-soluble cadmium sulfide (CdS) quantum dots (QDs) immobilized in spherical polyelectrolyte brushes (SPBs). The synthesis included three stages as follows: preparation of SPBs, introduction of Cd2+ by the ion-exchange process and in situ fabrication of CdS in SPBs. The X-ray diffraction (XRD) pattern and the transmission electron microscopy (TEM) images proved that the CdS nanocrystallines (NCs) were cubic in structure and well distributed in SPBs. The size and photoluminescence (PL) emission of hybrid nanoparticles (SPB@CdS) could be tailored by adjusting some parameters, such as pH of SPBs, the ratio of Cd/S, the temperature of reaction and dimensions of SPB@CdS. For instance, upon increasing the pH value of SPBs and the ratio of Cd/S, the trap emission of CdS NCs could be transformed into band-edge emission. And the PL emission shifted from 490 to 580 nm as the reaction temperature increased from 10 to 90 °C. More interesting was that the PL emission of SPB@CdS could be quenched and recovered reversibly by pH adjustment due to the pH sensitive chains of poly(acrylic acid) grafting from the polystyrene core. The SPB@CdS displayed excellent photochemical stability in visible light above pH 10 which provided a possibility for storing QDs in visible light. In addition, this simple method can be extended to other sulfide fabrication in SPBs, such as ZnS, which has also been successfully embedded in SPBs.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Wang Cao,Caiyun Jiang,Chen Chen,HaiFei Zhou,Yuping Wang
The novel Z-scheme CdS/Bi 4 O 5 Br 2 heterostructure was successfully synthesized by a simple mixed-solvent thermal method. It proved that the Z-scheme CdS/Bi 4 O 5 Br 2 heterojunction was constructed by XRD , SEM, TEM and XPS. The synthesis of CdS nanospheres on ultra-thin Bi 4 O 5 Br 2 nanosheets to form a heterojunction interface was beneficial to the dispersion and transfer of the photogenerated electron–hole pairs, which was demonstrated by PL , i-t and EIS. UV-Vis diffuse reflectance spectra attested CdS/Bi 4 O 5 Br 2 heterojunction enhanced utilization of visible light. The Z-scheme 0.5-CdS/Bi 4 O 5 Br 2 heterojunction exhibited the highest photocatalytic performance for degradation process of CIP and TC than that of pure CdS and Bi 4 O 5 Br 2 . In addition, recycling tests declared that the Z-scheme 0.5-CdS/Bi 4 O 5 Br 2 heterojunction compared with single CdS had higher stability and durability, attributing to effectively alleviating photocorrosion of CdS. It could be seen from the trapping agent experiment that superoxide free radicals and hydroxyl free radicals were the main active substances. The possible photocatalytic mechanism of the Z-scheme 0.5-CdS/Bi 4 O 5 Br 2 heterojunction under visible light irradiation was proposed.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ACS Catalysis
·
2018
·
IF 11.384
Min Zhou,Sibo Wang,Pengju Yang,Caijin Huang,Xinchen Wang
Ternary boron carbon nitride (BCN) semiconductors have been developed as emerging metal-free photocatalysts for visible-light reduction of CO2, but the achieved efficiency is still not satisfying. Herein, we report that the CO2 photoreduction performance of a bulk BCN semiconductor can be substantially improved by surface engineering with CdS nanoparticles. The CdS/BCN photocatalysts are characterized completely by diverse tests (e.g., XRD, FTIR, XPS, DRS, SEM, TEM, N2 sorption, PL, and transient photocurrent spectroscopy). Performance of the CdS/BCN heterostructures is evaluated by reductive CO2 conversion reactions with visible light under benign reaction conditions. Compared with bare BCN material, the optimized CdS/BCN photocatalyst exhibits a 10-fold-enhanced CO2 reduction activity and high stability, delivering a considerable CO production rate of 12.5 μmol h–1 (250 μmol h–1 g–1) with triethanolamine (TEOA) as the reducing agent. The reinforced photocatalytic CO2 reduction activity is mainly assigned to the obviously improved visible-light harvesting and the greatly accelerated separation/transport kinetics of light-triggered electron–hole pairs. Furthermore, a possible visible-light-induced CO2 reduction mechanism is proposed on the basis of photocatalytic and photo(electro)chemical results.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Jinjing Ju,Yihan Wu,Junhui Li,Dan Li,Feigao Xu
Fenton-like reaction based on Fe 3 S 4 /H 2 O 2 system has been applied in pollutants degradation, but the obvious drawbacks largely hinder its practical uses. Fe 3 S 4 /CdS composites were prepared using a hydrothermal method and tested for photo-Fenton catalytic activity. The degradation activity of the composites was tested using tetracycline hydrochloride (TCH) as an organic pollutant. The study investigated the effects of the mass ratio of Fe 3 S 4 and CdS, catalyst dosage, temperature, pH change, and H 2 O 2 dosage on the degradation of TCH. The study found that the removal rate of TCH by Fe 3 S 4 /CdS was 2.34 and 3.53 times higher than that of pure Fe 3 S 4 and pure CdS, respectively, at 35 °C when the mass ratio of Fe 3 S 4 to CdS was 1:1 and the pH value was 4.2. The Fe 3 S 4 /CdS composites widened the pH range for the Fenton reaction and still showed good degradation of TCH under neutral conditions. The trapping experiments of the active substances revealed that the main active radicals were •O 2 - , while •OH, h + , and e - play a minor role in the degradation of TCH. The catalytic reaction performance was improved by the synergistic effect of CdS and Fe 3 S 4 . Five cycle experiments were conducted on the Fe 3 S 4 /CdS composites, demonstrating their stability and reproducibility.
研究领域:
环境科学
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材料科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2011
·Vol. 13
·期 12
·6661-6672
·
IF 3.253
Zhou Qiang,Fu Ming-Lai,Yuan Bao-Ling,Cui Hao-Jie,Shi Jian-Wen
The semiconductor quantum dots (QDs) can be very efficient to tune the response of photocatalyst of TiO 2 to visible light. In this study, CdS QDs formed in situ with about 8 nm have been successfully deposited onto the surfaces of TiO 2 nanotubes (TNTs) to form TNTs/CdS QDs nanocomposites by use of a simple bifunctional organic linker, thiolactic acid. The diffuse reflectance spectroscopy (DRS) spectra of as prepared samples showed that the absorption edge of the TNTs/CdS composite is extended to visible range, with absorption edge at 530 nm. The photocatalytic activity and stability of TNTs/CdS were also evaluated for the photodegradation of rhodamine B. The results showed that when TNTs/CdS QDs was used, photocatalytic degradation of RhB under visible light irradiation reached 91.6%, higher than 45.4 and 30.5% for P25 and TNTs, respectively. This study indicated that the TNTs/CdS QDs nanocomposites were superior catalysts for photodegradation under visible light irradiation compared with TNTs and P25 samples, which may find wide application as a powerful photocatalyst in environmental field.
研究领域:
材料科学
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环境化学
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纳米技术
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光催化
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表面工程
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Mengyang Xu,Chao Sun,Xiaoxue Zhao,Haopeng Jiang,Huiqin Wang,Pengwei Huo
Fabricating the hierarchical heterostructure is efficient way for enhancing CO 2 conversion of semiconductor photocatalysts. Herein, a simple strategy has been employed to prepare several 3D hierarchical CdS/Ni-MOF heterostructure photocatalysts, and the selective photoreduction of CO 2 to CO under simulated sunlight in the gas–solid phase reactor. Among the prepared photocatalysts, 20%-CdS/Ni-MOF shows the best CO yield, which was 16 times and 7 times that of Ni-MOF and CdS, respectively. By controlling the morphology of the catalyst, we found that the significant improvement in photocatalytic activity can be ascribed to the synergistic effect of heterostructure in CdS/Ni-MOF and its unique hierarchical structure, which can improve the efficiency of charge transmission and provides abundant active sites, etc. Finally, the preliminary photocatalytic mechanism was discussed by in situ FTIR and liquid ultraviolet spectrophotometer.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 5
·e70141
·
IF 0
Huan Zhang,Wen-Qi Jin,Peng Li,Wei Gao,Xiu-Mei Zhang
A highly efficient photocatalyst, the CdS/Mn-MOF composite, was synthesized by first preparing a new 2D Mn-MOF (Mn(L)·H 2 O, H 2 L = 5-(2-benzothiazolyl)isophthalic acid) precursor through the solvothermal method and subsequently growing CdS nanoparticles. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV–vis spectroscopy, and other techniques were utilized to characterize the structural, morphological, textural, compositional, and optical properties of the composites. The prepared photocatalysts, designated as X-CdS/Mn-MOF (where X = 50, 25, and 10, represents the mass percentage of CdS), were tested for photocatalytic performance. Among them, the 50-CdS/Mn-MOF sample exhibits the optimized degradation efficiency of 99.1% for Rhodamine B (RhB, 20 mg/L) in 50 min under visible light irradiation, which is 7.3 times and 2.4 times higher than that of Mn-MOF and CdS, respectively. Various test results indicate that the improved photocatalytic activity of CdS/Mn-MOF composites can be attributed to the formation of heterojunctions. Specifically, the heterojunctions enhance the separation efficiency of photogenerated carriers and effectively suppress the recombination of electrons and holes, thereby improving the overall efficiency of the photocatalytic reaction. Moreover, the presence of heterojunctions optimizes the material's band structure, facilitating more efficient carrier transport, which further enhances photodegradation performance. Radical quenching experiments confirmed hydroxyl radicals (·OH − ) and superoxide radical anions (·O 2 − ) played dominant roles in the photodegradation process. Additionally, the composite material also demonstrates good stability and reproducibility. The research further provides evidence that the efficiency of dye degradation can be significantly improved by the rational design of composite catalysts consisting of other semiconductors and MOFs.
研究领域:
材料科学
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环境科学
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DOI
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Xin Li,Xiang Chen,Hao Niu,Xiao Han,Ting Zhang,Jiuyu Liu,Huiming Lin,Fengyu Qu
In this paper, CdS/TiO 2 heteronanofibers have been prepared for the photocatalysis toward organic dyes under visible irradiation. Firstly, the one dimensional (1D) TiO 2 porous nanofibers (50–100) nm in diameter and several micrometers in length were synthesized by electrospinning and then CdS nanopaticles (50–100 nm in size) successfully grown onto TiO 2 fibers to form the heterostructure . These CdS/TiO 2 heteronanofibers were adopted as photocatalyst and the photocatalsis processes were analyzed in detail, showing the enhanced visible photodecomposition and good recycle ability. Furthermore, the degradation kinetics was further investigated by varying the amount of CdS. The increase of CdS component may enhance the degradation rate under visible light , but the total degradation efficiency also is affected by the adsorption capacity of catalyst toward the dyes. With the improved visible light degradation performance, these CdS/TiO 2 heteronanofibers would be expected to be used in water purification .
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Jiaxin Song,Cheng Rao,Zeshu Zhang,Xiangguang Yang,Yibo Zhang
Photocatalytic reforming of plastics, involving converting plastics into valuable chemicals while producing hydrogen from water, is a promising green technology with sustainability potential. However, designing catalysts with optimized structures to further enhance efficiency remained a major challenge. In this study, a series of CdS Quantum dots (QDs) with different sulfur defect concentrations were synthesized by a one-step solvothermal method by adjusting the type of sulfur precursors. In the absence of co-catalysts, the optimal CdS-NS photocatalyst achieved reforming of polyethylene terephthalate (PET) into formate with 870 μmol g −1 h −1 and acetate esters with 90 μmol g −1 h −1 , while the hydrogen production rate reached 1771 μmol g −1 h −1 . EPR spectra and other analyses confirmed the presence of abundant sulfur defects in the prepared CdS QDs and further demonstrated that the concentration of sulfur defects was closely related to photocatalytic performance. Suitable sulfur defects effectively modulated the electronic and band structure of CdS QDs, enhanced the oxidation capacity of photogenerated holes, reduced the recombination rate of charge carriers, and ultimately improved photocatalytic activity. This work provided an effective approach for designing efficient photocatalysts for the high-value recycling of plastic waste to achieve carbon neutrality.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2020
·Vol. 152
·期 24
·
IF 2.991
Zhu Jingxian,Jiang Wenshuai,Wang Bin,Niu Lijuan,Dong Chenxi,Qu Dan,An Li,Wang Xiayan,Sun Zaicheng
Mixed phase TiO 2 (Degussa P25) exhibits superior photocatalytic performance and stability due to the formation of the hetero-phase junction between anatase and rutile. However, the large bandgap limits its visible light activity. CdS is a photocatalyst with a broad light absorption band up to 550 nm. Constructing a hetero-phase junction will greatly promote the photocatalytic activity of CdS. In this work, the one-step solvothermal method was used to synthesize CdS hetero-phase junction with both hexagonal wurtzite (WZ) and cubic zinc blende (ZB) phases. The ratio of WZ and ZB phases can be tuned by adjusting the solvent ratio and reaction time to construct type I junction and effectively separate the photogenerated electron–hole pair. Under visible-light illumination, the optimal photocatalytic activity of the prepared material reaches 7.96 mmol h −1 g −1 , and the quantum efficiency is 36.7% at 420 nm, which is three times higher than that of any single-phase sample (cubic or hexagonal phase) and maintains high photocatalytic stability as well. It is expected that this work will provide a feasible prospect for the practical application of high-efficiency homogeneous junction photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 8
·2715-2721
·
IF 4.052
Lin Lin,Siyu Huang,Yuxin Zhu,Biao Du,Zhihua Zhang,Chao Chen,Xuewen Wang,Ning Zhang
A new synthetic method was used to develop a CdS/MoS2 heterojunction. Cd-MOF was coated onto the surface of MoS2 flowers to construct a core–shell MoS2@Cd-MOF. Thioacetamide was used as a sulfur source to sulfurize the MoS2@Cd-MOF to form a CdS/MoS2 heterojunction. Since the Cd2+ ions were highly ordered and separated by the organic ligands of the Cd-MOF shell, the as-synthesized CdS/MoS2 heterojunction possessed a large surface area and intimate contact at the heterogeneous interface with a uniform loading of CdS nanoparticles on the MoS2 flowers. Consequently, the CdS/MoS2 heterojunction exhibited a significantly enhanced photocatalytic H2 evolution rate of average 5587 μmol h−1 g−1 under UV-visible light irradiation.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2015
·
IF 4.513
Yuhan Zhu,Kai Yan,Yong Liu,Jingdong Zhang
A photoelectroactive film composed of CdS quantum dots and graphene sheets (GS) was coated on F-doped SnO 2 (FTO) conducting glass for studying the electrochemical response of p -phenylenediamine (PPD) under photoirradiation. The result indicated that the cyclic voltammogram of PPD on CdS–GS hybrid film became sigmoidal in shape after exposed under visible light, due to the photoelectrocatalytic reaction. Such a photovoltammetric response was used to rapidly optimize the photoelectrocatalytic activity of hybrid films composed of different ratios of CdS to GS toward PPD. The influences of scan rate and pH on the photovoltammetric behavior of PPD on CdS–GS film revealed that although the controlled step for electrochemical process was not changed under photoirradiation, more electrons than protons might participate the photoelectrocatalytic process. Furthermore, the photoelectroactive CdS–GS hybrid film was explored for PPD determination based on the photocurrent response of film toward PPD. Under optimal conditions, the photocurrent signal on CdS–GS film was linearly proportional to the concentration of PPD ranging from 1.0 × 10 −7 to 3.0 × 10 −6 mol L −1 , with a detection limit (3S/N) of 4.3 × 10 −8 mol L −1 . Our work based on CdS–GS hybrid film not only demonstrated a new facile photovoltammetric way to study the photoinduced electron transfer process of PPD, but also developed a sensitive photoelectrochemical strategy for PPD determination.
研究领域:
材料科学
·
分析化学
✓ 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）