Advanced Materials Interfaces
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2022
·Vol. 10
·期 5
·2201627
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IF 6.389
Xin Wang,Kaili Wu,Wei Cao,Kun Rui,Wenchao Wang,Ruixue Zhu,Jixin Zhu,Zhiping Yan
The intrinsic charge carriers’ recombination and excited states decay greatly suppress the active species survival and photo(electro)catalytic performance. Inspired by Z-scheme strategy, the polymeric nitrogen-rich carbon nitride/cadmium sulfide (g-C 3 N 5 /CdS) core–shell heterojunction is constructed to optimize photocatalytic performance. The optimal hydrogen production rate of g-C 3 N 5 /CdS heterojunction catalyst under visible light without adding extra cocatalyst is up to 7860 µmol h −1 g −1 , which is 3 and 71 times higher than that of pure CdS and g-C 3 N 5 photocatalysts, respectively. The femtosecond transient absorption spectroscopy is employed to observe the kinetic decay of carriers in the heterojunction, revealing the ultrafast charge trapping process (τ 1 = 52.3 ps) and long-lived excited states (τ 3 = 1109.2 ps) in g-C 3 N 5 /CdS photocatalyst. Meanwhile, density functional theory calculation results comprehensively suggest the promoted charge separation in heterojunction. Cost-effective Z-scheme g-C 3 N 5 /CdS photocatalyst in this work shows a great potential for sustainable and high-efficiency solar-to-H 2 conversion.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Boqiang Gao,Yu Pan,Qianqian Chang,Zhonghua Xi,Hu Yang
In this work, the sheet-like BiVO 4 with a higher exposure ratio of {0 1 0} facets was synthesized by the addition of TiCl 3 , and the ratio of (0 4 0)/(0 1 1) on {0 1 0}BiVO 4 was 2.85 times higher than that of normal decahedral BiVO 4 . Accordingly, the {0 1 0}BiVO 4 /Ag/CdS all-solid-state Z-scheme heterojunction was further constructed by photoreduction of Ag and chemical deposition of CdS on the well prepared {0 1 0}BiVO 4 successively. The performance and mechanism of {0 1 0}BiVO 4 /Ag/CdS in synergistic adsorption-photodegradation of fluoroquinolones (FQs) from water were investigated in detail. The adsorption-photodegradation could be divided into three processes: adsorption, surface degradation, and solution degradation, with the rate constants of 0.118, 0.029, and 0.012 min −1 , respectively. Accordingly, the adsorption was a rapid process due to the combined CdS in this composited photocatalyst had a high affinity to FQs to achieve an adsorption equilibrium on the surfaces<30.0 min. Besides, {0 1 0}BiVO 4 /Ag/CdS had a better separation efficiency of photogenerated electron-hole pairs than BiVO 4 /Ag/CdS, because the enriched {0 1 0} facets of {0 1 0}BiVO 4 caused more BiVO 4 /Ag/CdS ternary structure formed, and>90% photodegradation efficiency for five FQs ( C 0 = 0.062 mmol/L) was thus obtained within 60.0 min. The radical trapping and EPR results showed that holes and superoxide radicals were the main active species for FQs photodegradation. In summary, {0 1 0}BiVO4/Ag/CdS achieved an enhanced performance in synergistic adsorption and photodegradation of organic contaminants from water, and a talented photocatalyst was thus provided in water and wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yunning Chen,Lu Yang,Yingnan Sun,Renquan Guan,Di Liu,Jie Zhao,Qingkun Shang
A CDs@Cu-HQCA/TiO 2 flower composite photocatalyst (CDs: carbon dots, HQCA : 8-hydroxyquinoline-5-carboxylic acid) was constructed by exploiting the synergy of complex-sensitization, TiO 2 -morphology control, and carbon dot-surface modification. The photocatalytic degradation of phenol, norfloxacin, tetrabromobisphenol A and Cr (VI) by Cu-HQCA/TiO 2 particle, tube, diamond and flower-like show that the Cu-HQCA complex effectively extends the visible light absorption range of composite photocatalysts, and the flower morphology of TiO 2 not only improves the adsorption of pollutants but also enhances the photoelectric response of the composite photocatalyst. In this manner, a CDs@Cu-HQCA/TiO 2 flower catalyst that demonstrates excellent performance for the removal of dexamethasone, which does not degrade well naturally, was prepared, which delivered a rate of degradation of 99.4% and a degree of mineralization of 77.4% for dexamethasone. Possible degradation sites and dexamethasone degradation products were studied by combining computational chemistry with high-resolution mass spectrometry, and a possible mechanism for photogenerated carrier transmission and separation in the CDs@Cu-HQCA/TiO 2 flowers is proposed.
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CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Shanshan Qiao,Chao Feng,Yuan Guo,Tingxiang Chen,Naeem Akram,Yi Zhang,Wei Wang,Fan Yue,Jide Wang
The exploration of bifunctional catalysts to produce both hydrogen and oxygen will accelerate the progress of overall water-splitting. This paper introduces a facile method to fabricate bifunctional photocatalysts toward the water splitting by doping nano CdS with S vacancies on Ni@NiO nano-spheres. A serious of photocatalytic catalysts were developed and subsequently characterized, the two half-reactions of photocatalytic water splitting were studied in detail by using sacrificial agents, the hydrogen output at 41699 μmol g −1 h −1 (AQE 28.5%, λ = 420 nm) while the evolution of O 2 is as high as 55120 μmol g −1 h −1 (AQE 35.7%, λ = 450 nm). It is a strategy that the presence of Ni@NiO can trigger the S vacancy in CdS to act as an effective electron trap, the p-n junction of NiO-CdS, as well as the Schottky barrier between NiO and Ni, can change the dynamic characteristics of photogenerated electrons and prolong their life. These prolonged photogenerated electrons can initiate stable and effective photocatalytic redox reactions.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Lixiang Zhang,Pan Li,Luping Feng,Xi Chen,Jiatian Jiang,Sheng Zhang,Anchao Zhang,Guofu Chen,Hua Wang
Visible-light-driven and ultra-stable CoS x /CdS photocatalysts were controllably fabricated by the ZIF-67-templated one-pot solvothermal route for highly efficient photocatalytic Cr(VI) reduction. It was discovered that the resulting CoS x /CdS composites could present different photocatalytic activities controllably depending on the CoS x -to-CdS molar ratios used. The one with 1/16 M ratio could display the highest photocatalytic reduction performance for Cr(VI) with the efficiency up to 100% within 30 min, which is 5.6-fold and 2.1-fold higher than that of pristine CoS x and CdS, respectively. Herein, the components of CoS x and CdS with well-matched energy-band structures might serve separately as the electrons donor and the holes quencher to prolong the lifetime of photogenerated electrons in CoS x /CdS composites. A direct Z-scheme heterojunction could be thus constructed for promoting the charge carrier transferring with the improved redox abilities, leading to the robust photocatalysis of CoS x /CdS photocatalyst. Moreover, the developed CoS x /CdS photocatalyst could present superior stability with the structure and activity well survived after five photocatalytic cycles. This work may pave the way towards the controllable construction of a direct Z-scheme photocatalytic system by synergistically combining two kinds of components with matched energy-band structures, achieving the enhanced photocatalysis for the wide applications in the environmental remediation field.
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Nanoscale
·
2020
·Vol. 12
·期 20
·11267-11279
·
IF 6.895
Hongkai Zhao,Xiaoxia Li,Mingyue Zheng,Xian Zhao,Qun Zhang,Yi Luo,Weiliu Fan
The construction of both highly efficient and stable hybrid artificial photosynthetic systems comprising semiconductors as photosensitizers and abundant metal-based molecular complexes as cocatalysts for photocatalytic H2 generation remains challenging. Herein, we report an effective and stable CdS/cobaloxime hybrid system prepared by inserting an amorphous TiO2 (a-TiO2) interlayer with adjustable thickness and by covalently-surface-attaching molecular cobaloxime catalysts. This hybrid system displayed outstanding photocatalytic H2 production and reached a maximum rate of ∼25 mmol g−1 h−1, which was ∼20.8 times that of pure CdS and 1.7 times that of the CdS/cobaloxime system without an a-TiO2 interlayer (CdS/Co). More importantly, 6 nm a-TiO2 uniformly coated CdS nanorods (CdS NRs) exhibited exceptional 200 h long-term catalytic behaviour under ≥420 nm visible light irradiation. However, the H2 production performance of the CdS/Co hybrid system decreased significantly over 10 h. Density functional theory (DFT) calculations indicated that the a-TiO2 surface can provide abundant bonding sites for the effective immobilization of molecular catalysts. Moreover, Mott–Schottky electrochemical measurements and femtosecond transient absorption spectroscopy revealed that the a-TiO2 interlayer had favourable band levels that could fasten the photoexcited electron transfer from CdS to molecular cobaloxime and could extract holes with intraband electronic states generated by defects, thus prohibiting CdS photocorrosion and improving the stability of the hybrid system. This study proposes a strategy for designing multifunctional interlayers for the effective immobilization of molecular catalysts, beneficial regulation of photoinduced charge carriers, and improvement of the stability as well as facilitation of the construction of artificial photosynthetic hybrid systems with high efficiency and durability.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Danwen Yao,Zhenyu Hu,Liansheng Zheng,Shanming Chen,Wei Lü,Huailiang Xu
The research deals with fabrication of CdS/CdSe-sensitized quantum dot sensitized solar cells (QDSSCs) with laser-engineered black rutile TiO 2 nanoparticles (TiO 2 -NPs) as the photoanode material. Three QDSSC devices with pristine and two types of black rutile TiO 2 -NPs engineered respectively in water and ethanol by intense femtosecond laser propagating in the filamentation regime were prepared in the same architecture. Extremely different power conversion efficiencies (PCE) of 1.43 %, 3.68 % and 9.11 %, in which the black TiO 2 -NPs-based devices show respectively a two-fold and six-fold PCE higher than the pristine TiO 2 -NPs, were obtained. The absorption and electrochemical impedance spectroscopy analyses revealed that the device with the highest PCE has the highest absorption efficiency in the wide spectral range from UV to mid-infrared and shunt resistance ( R sh ) of 1364.9 Ω, but the smallest series resistance ( R s ) of 190.3 Ω, which are attributed to the surface modification on the structural and optical properties of TiO 2 -NPs by femtosecond laser pulses.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ming Fang,Zhenfei Yang,Yang Guo,Xinnian Xia,Shuaijun Pan
The internal electric field induced by piezoelectric effect can optimize the transport pathway of photogenerated charge in photocatalysis. We constructed an effcient piezoelectric photocatalytic heterojunction UiO-66-NH 2 @CdS and achieved a shift in the charge transfer mechanism through the piezoelectric effect, resulting in excellent photocatalytic H 2 evolution performance. The optimal heterojunction under the ultrasonic environment exhibited 2028.48 μmol·g −1 ·h −1 photocatalytic H 2 evolution performance, roughly four times better than no-ultrasound condition. Because of the piezoelectric polarization of UiO-66-NH 2 , the photogenerated carrier transport mechanism was changed from type Ⅱ to the more favorable Z-scheme for charge separation. Meanwhile, the built-in electric field caused by the piezoelectric effect can act as a powerful driving force for charge separation, achieving high charge separation efficiency and promoting the utilization of photogenerated electrons. This work would provide a fresh perspective for MOF-based piezoelectric photocatalysts and have implications for the design of efficient Z-scheme heterojunctions.
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Materials Today Communications
·
2023
·
IF 3.8
Kun Liu,Long Zhao,Xiaoqing Yue,Bin Li,Xing Qin,Qiang Li,Jianbin Zhang
Without any external template & surfactant , CdS nanoparticles (NPs) with surface-phase junctions were synthesized directly from CdCl 2 and the CS 2 -storage material (CS 2 SM) with a simple one-pot strategy, in which only stirring was needed. Under visible light irradiation, the as-synthesized CdS NPs could selectively catalyze the reduction of CO 2 to produce CO and CH 4 sustainably with a perfect catalyst stability even after 33 h. At 4 °C and the optical power density of 370 mW/cm 2 , the as-synthesized CdS NPs from 0.5 g CS 2 SM exhibited 195.41 μmol/g cat CH 4 generation capacity and the 9.01 μmol·g cat −1 ·h −1 maximum average yield, in which the generation ratio of CH 4 /CO was at 8:2; and the as-synthesized CdS NPs from 2.0 g CS 2 SM exhibited 119.95 μmol/g cat CO generation capacity and the 3.75 μmol·g cat −1 ·h −1 maximum average yield, in which the generation ratio of CH 4 /CO was at 1:3. The research results indicated that CdS NPs with higher hexagonal content and smaller particle size is more active in CO 2 photoreduction, which may be due to the low potential CdS NPs surface phase junction reducing the recombination rate of electron hole pairs and improving photocatalytic activity. The simple preparation of CdS NPs and their further photocatalytic CO 2 reduction provide a green and sustainable foundation for the application of sulfide photocatalysts .
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jiajia Li,Yi Li,Manhua Chen,Xi Tang,Nianwen Zhu,Wenxuan Li,Qiong Mei,Shijun Yue,Yuping Tang,Qizhao Wang
The exploitation of magnetic recyclable and effective degradation photocatalysts with wide-pH-range response was essential to the practical application in the photo-Fenton process. In this study, Cd/CdS coupling with CuO/Fe 2 O 3 /CuFe 2 O 4 (CF) was employed to prepare an efficient and recyclable photocatalyst Cd/CdS-CuO/Fe 2 O 3 /CuFe 2 O 4 (CCCF). The obtained CCCF was utilized to activate H 2 O 2 for the photo-Fenton degradation of tetracycline after verifying optical properties and energy band structures. The photo-Fenton degradation performance of CCCF on tetracycline was researched in the effects of photocatalyst concentration, initial pH and H 2 O 2 volume. The photo-Fenton removal efficiency of CCCF+H 2 O 2 was capable of achieving 82.43 % under the optimal reaction condition, which was apparently higher than that of Cd/CdS and CF. The enhanced degradation efficiency could be owned to the effective carriers separation thanks to the p-n heterojunction . The development of such photocatalysts offers a new approach to degrading organic pollutants from industrial wastewater , making it a valuable tool for contaminants degradation.
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FUEL
·
2023
·
IF 7.4
Yuwei Ma,Yan Li,Fenglong Zhang,Fei Ruan,Ruifen Wang,Guangtong Hai,Juming Liu,Jinxiao Bao
Ni directional doping in the lattice of CdS V with the Ni cations targeted linked to P (CdS V -Ni-P) was successfully synthesized via a step wise assembly method, which exhibited an excellent photocatalytic hydrogen production performance. The photoelectric performance characterization proved that the Ni directional doping and Ni cations targeted linked with P in CdS V -Ni-P not only accelerating the photo-generated electrons transfer but also decreasing efficiency of the charge recombination. The density functional theory (DFT) calculations proved that CdS V -Ni-P can also induce more charge-carriers participate in photocatalytic reaction and decrease electron binding restriction capacity. Moreover, the results of UV–vis DR spectra and VB-XPS spectra confirmed that the construction of this CdS V -Ni-P could effectively narrow the bandgap. Meanwhile, the result of Gibbs free energy demonstrated the S-H adsorption bond in CdS V -Ni-P was get weaken, which is benefit for hydrogen desorption from S sites, thus achieving a high hydrogen evolution reaction (HER) result. Based on the synergistic effects, CdS V -Ni 6.7 -P 9.6 presented a relatively high hydrogen evolution rate of 167.5 mmol h -1 g −1 under the visible light irradiation (λ ≥ 420 nm), which is almost 60 times of CdS V .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Shujuan Zhang,Yanpeng Mao,Lai Wei,Zhanlong Song,Xiqiang Zhao,Wenlong Wang
The use of thermal conversion to convert Chinese patent medicines (CPM) residues into porous carbon-based materials and carbon dots (CDs) has effectively resolved the challenges associated with resource waste and environmental pollution while enhancing the added value of CPM residues. In this study, biochar and N-doped CDs with high quantum yield (QY) were simultaneously prepared from fermentation residues by employing a hydrothermal carbonization method without any chemical reagents . The obtained biochar had remarkable adsorption capacity, with an iodine adsorption value of 693.22 mg g –1 . The QY of N-doped CDs could reach to 36.17 % by the mean of self-doping due to the high nitrogen content of the fermentation residues. Considering the structural integrity and permeable porous structure of the two-dimensional leaf-like zeolitic imidazole framework (ZIF-L), N-doped CDs were encapsulated into ZIF-L to form novel fluorescent composites (N-doped CDs@ZIF-L). Moreover, N-doped CDs@ZIF-L as a novel fluorescent probe could be efficiently quenched in the presence of tetracycline (TC), doxycycline (DOC), and chlortetracycline (CTC) by static quenching and the inner filter effect . Notably, the fluorescent probe exhibited a good linear relationship with the TC, DOC, and CTC at 0–50, 0–50, and 0–45 μM, respectively, with limits of detection of 0.025, 0.033, and 0.027 μM, respectively. This probe could be employed to detect TC antibiotics in honey and milk, suggesting that it had the great potential for applications in environmental monitoring and food safety.
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