Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 6
·125013
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IF 7.5
Wenjie Guo,Yinghua Lan,Wenbing Wu,Jien Niu,Yanmei Chen,Wenlong Xiang,Juan Xu,Yanhui Zhang
By combining the sol-gel method with the coprecipitation synthesis strategy, a series of cadmium sulfide-based catalysts (MTiO x -CdS, where M = Ce, Co, Cu, Zn) were successfully prepared. Under simulated sunlight irradiation, the material exhibited efficient and stable degradation performance for ciprofloxacin (CIP). Remarkably, by constructing a Cr(Ⅵ)-mediated redox system, a significant leap in degradation efficiency from nearly zero to 90% was achieved for bisphenol A (BPA) and ibuprofen (IBU). Studies reveal that Cr(Ⅵ) plays a dual role in this system, acting as both an "electron bridge" and an "adsorption anchor": on one hand, it serves as an electron acceptor to significantly inhibit charge carrier recombination; on the other hand, it enriches pollutants through coordination effects, thereby synergistically enhancing electron transfer and interfacial reactions. This work not only presents a cost-effective and efficient strategy for the synthesis of MTiO x -CdS photocatalysts but also offers valuable insights into the development of novel photocatalytic systems aimed at the remediation of complex water pollution and energy conversion applications.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Xinlin Wang,Rudong Zhu,Xiangkui Wang,Fengjiao Liu,Yan Gao,Rongfeng Guan,Yalei Chen
In this paper, the application of metal organic frameworks (MOFs) doped with carbon dots in fluorescence detection was studied.CDs@Eu-MOF/PVDF thin films were prepared by simple solvothermal method, carbon dots modification and in-situ growth process.The structure and morphology of the film was characterized by XRD, SEM, FT-IR and XPS.The results show that CDs@Eu-MOFs membrane has strong red fluorescence, good stability in methanol solvent, and high selectivity and sensitivity to nitrobenzene and 4-nitrophenol.The CDs@Eu-MOFs/PVDF film material can be used to detect nitrobenzene and 4-nitrophenol in methanol solvent and gaseous state. The detection limits of nitrobenzene and 4-nitrophenol in liquid are 0.2807 mg/L and 0.0168 mg/L, and the detection limits of nitrobenzene and 4-nitrophenol in gaseous state are 0.346 mg/L and 0.0136 mg/L.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Sujuan Li,Haoqi Wu,Yuhang Sang,Bingtao Wang
Graphene@CdS nanowires (GP@CdS NWs) was synthesized by electrostatic assembly and hydrothermal method, and then decorated with CuO nanoparticles via electrodeposition on substrate of glassy carbon electrode to conctruct a photoelectrochemical enzyme-free glucose sensor. Scanning electron microscopy, electrochemical impedance spectroscopy and cyclic voltammetry were used to characterize the morphology and electrochemical properties of the above ternary CuO/GP@CdS NWs nanocomposites. The integration of photosensitive material GP@CdS NWs with electrocatalytic materials of CuO makes the nanocomposites show prominent photoelectrocatalytic activity toward glucose oxidation in alkaline solution. A 2.45 times increase in sensitivity under visible light irradiation was observed compared to dark condition. As a photoelectrochemical platform for non- enzymatic glucose sensing, the CuO/GP@CdS NWs modified electrode exhibited advantages, such as high detection sensitivity, wide linear concentration range, low detection limit and acceptable antiinterference ability. Good recovery obtained for glucose analysis in human serum sample suggested the validity of the proposed method for real sample analysis.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 7
·1-10
·
IF 5.7
Zhang Yujie,Yu Jiarui,Huang Wanjin,Jin Zhenhuan,Li Jianping
A novel extended-gate field-effect transistor (FET) photoelectrochemical (EGFET PEC) sensor was designed for highly sensitive detection of L-cysteine (L-Cys). TiO 2 was initially modified on the ITO electrode by the sol–gel dip-coating method and calcined to produce TiO 2 /ITO. Then, CdS was synthesized on the TiO 2 surface by hydrothermal method to obtain the CdS–TiO 2 heterojunction material. CdS/TiO 2 /ITO was connected to the gate of the FET to obtain an EGFET PEC sensor. Under the irradiation of a xenon lamp simulating visible light, the CdS/TiO 2 heterojunction composite absorbs light energy to produce photogenerated electron–hole pairs, which have strong photocatalytic oxidation activity and oxidize L-Cys covalently identified by Cd(II) through CdS covalent. These pairs generate a photovoltage that controls the current between the source and the drain to detect L-Cys. Under the optimized experimental conditions, the optical drain current ( I D ) of the sensor exhibited a good linear relationship with the logarithm of L-Cys in the range of 5.0 × 10 −9 –1.0 × 10 −6 mol/L, and the detection limit was 1.3 × 10 −9 mol/L (S/N = 3), which is lower than the values reported by other detection methods. Results showed that the CdS/TiO 2 /ITO EGFET PEC sensor revealed high sensitivity and good selectivity. The sensor has been used to determine L-Cys in urine samples. Graphical abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Honghui Jiang,Zhenxin Hu,Yuanhao Ouyang,Xiaodong Ji,Xi Hu,Tingting Li,Ke Ouyang,Ping Wang,Hui Wang,Xinjiang Hu
Mounting evidence highlights the negative impacts of thiamethoxam (THM) on non-target organisms and ecosystem. Herein, multi-phase cadmium sulfide loaded on biochar (CdS@BC) was used to photocatalytic activate peroxymonosulfate (PMS) to remove THM. The obtained CdS@BC significantly improved the photocatalytic performance of PMS on THM degradation with a superior rate constant of 0.165 min −1 , 60 times more than that of BC. In addition, the catalyst displayed excellent stability and reusability. The mechanism of free radical formation by adsorption activation of PMS adsorbed on CdS@BC was characterized using active species detection and Density functional theory (DFT) calculations. According to the DFT study, the phase junction and π-conjugated structure contribute to the stable migration of π-electrons, thus effectively activating the PMS to produce active substances for the degradation of THM. The findings provide a theoretical basis for the design and synthesis of effective catalysts for AOPs to remove emerging organic contaminants from wastewater.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Huijie Wang,Yang Wan,Binrong Li,Jian Ye,Jiahao Gan,Jiejing Liu,Xin Liu,Xianghai Song,Weiqiang Zhou,Xin Li,Pengwei Huo
The charge carrier separation efficiency and the adsorption capacity of the photocatalyst usually affect the degradation rate of antibiotics. Herein, Cerium-doped leaf-like CdS (Ce-CdS) modified with ultrathin N-doped rGO (N-rGO) composites were successfully constructed (Ce-CdS/N-rGO) to investigate the removal efficiency of tetracycline (TC). X-ray photoelectron spectroscopy (XPS) and photoelectrochemical results revealed that Ce ions doped in CdS acting as the electron capture sites facilitated the interfacial charge transfer. Theoretical calculation (DFT) results indicated that the interfacial effect between Ce-CdS and ultrathin N-rGO promoted the transfer of photogenerated electrons under the synergistic effect between the doping and interface modification strategy. The optimized Ce5-CdS/N-rGO20 composites had the maximum TC removal capability (94.5%) and maintained a stable cycling performance. In addition, the adsorption-driven photocatalytic degradation pathway of TC was studied through mass spectrometry (MS) and in-situ Fourier transform infrared spectroscopy ( in-situ FTIR). This study will provide an effective strategy for the construction of efficient photocatalytic composites for wastewater treatment.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 17
·1-12
·
IF 2.8
Ramya A. Janaki,Shobanadevi N.,Mangaiyarkarasi S. P.,Sankar R.
Promoting the charge separation to improve photocatalytic performance of semiconductor photocatalysts is very important in the field of artificial photosynthesis. Here, a novel MoS 2 /CdS 2D–2D ultrathin nanosheet heterostructure was fabricated via a one-pot solvothermal route. The obtained 2D–2D MoS 2 /CdS nanojunction has not only provided large contact areas, but also shortened the charge-transport distance, resulting in significantly enhanced photocatalytic H 2 evolution property. By optimizing the 2D MoS 2 amounts in the heterojunction, the 5 wt% 2D/2D MoS 2 /CdS heterojunction displayed the maximal photocatalytic H 2 evolution rate of 5566 μmolh −1 g −1 under visible-light irradiation in the presence of lactic acid as the sacrificial reagent, which was 10.1 times higher than that of pristine 2D CdS (516 μmolh −1 g −1 ). Based on the photoelectrochemical and photoluminescence spectra tests, it could be deduced that the charge separation and transfer of 2D/2D MoS 2 /CdS heterojunction were tremendously improved, and the recombination of photoinduced electron–hole pairs was effectively impeded. Moreover, the 2D MoS 2 was used as a co-catalyst to provide the abundant active sites and lower the overpotential for H 2 generation reaction. The current work would offer an insight to fabricate the 2D/2D heterojunction photocatalysts for splitting H 2 O into H 2 .
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CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Linxi Wang,Xudong Qian,Yang Ren,Hairui Lei,Xiaofei Hu,Dongdong Chen,Jiongzhao Li,Xiaogang Peng
The CdS shells are epitaxially grown onto monodisperse zinc-blende CdSe core nanocrystals in octadecene mixed with fatty amines, with the volume fraction of fatty amines in the epitaxy solution (VNH2) varying between 0 and 100%. The shape─except the nanoplatelets from the reactions with medium VNH2 (especially 20% VNH2)─and surface ligands of the resulting CdSe/CdS core/shell nanocrystals from all reactions can be unified through a two-step surface treatment. The internal lattice defects originated from zinc-blende/wurtzite stacking fault(s), i.e., wurtzite lattice domain(s) in the CdS shells and twin fault(s) in the zinc-blende region, can be systematically controlled by varying the VNH2 and remain unaltered during the surface treatments. Both twin faults and wurtzite CdS lattice domains neither affect the electronic structure of the core/shell nanocrystals nor create internal electronic defects for the nanocrystals. Photoluminescence decay dynamics of the dot-shaped core/shell nanocrystals with solely twin faults can be mono-exponential and near-unity radiative decay, but photoluminescence of those with wurtzite CdS domains would always decay with double-exponential even if the photoluminescence quantum yield is unity. The results here imply that the most common lattice defects related to the stacking faults for II–VI and III–V semiconductor nanocrystals can be managed for achieving high-quality optical properties.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Haodong Sun,Zuoyi Xiao,Zhenyu Zhao,Shangru Zhai,Qingda An
Accelerating the charge separation efficiency is a crucial approach to improve the photocatalytic performance of semiconductors. The design and synthesis of heterojunctions can effectively inhibit the recombination of photogenerated electron-hole pairs and enhance the charge separation efficiency. In this work, an easy-handling calcination route was proposed to prepare CdS/ZnS heterojunction loaded on honeycomb-like porous carbon (CZS@C) using chitosan as a precursor. The unique honeycomb-like porous structure facilitated the separation and migration of photoexcited electrons and holes, improving the utilization of visible light and shortening the distance of electron transport. The photocatalytic performance of CZS@C was evaluated by the degradation of tetracycline (TC) and H 2 production from water splitting under visible light. The optimized CZS@C composite can degrade almost 92.40 % of TC under visible light irradiation in 60 min. Such CZS@C composite presented an excellent photocatalytic activity with H 2 production rate of 5.49 mmol h −1 g −1 , which was 54.9 and 2.28-folds higher than ZnS@C and CdS@C. Furthermore, the possible photocatalytic reaction mechanism and pathway towards TC degradation and simultaneous H 2 generation was proposed.
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CHEMOSPHERE
·
2022
·
IF 8.943
Chong Liang,Mingyu Cui,Wei Zhao,Linyang Dong,Shangshang Ma,Xutang Liu,Dingkai Wang,Zhijie Jiang,Fei Wang
Photocatalytic technology has been considered as a promising method to alleviate environmental pollution owing to the dual characteristics of redox. The novel V-based H 5 PMo 10 V 2 O 40 (HPA-2) photocatalyst with Z-scheme heterostructure was constructed. The energy level of HPA-2 matches well with CdS and g-C 3 N 4 (CN) according to Mott-Schottky and UV–Vis diffused reflectance tests, which allows the efficient separation of photogenerated electrons. The optimized CdS/HPA-2/CN showed superior ability in Rhodamine B (RhB) degradation and reduction of Cr (Ⅵ) under visible light irradiation. The maximum rate constant reached 0.092 min −1 for RhB degradation at 60 min and 0.260 min −1 for Cr (Ⅵ) reduction at 20 min, respectively. The photocatalytic mechanism was analyzed by adding scavengers. The effect of active species for RhB degradation was determined as h + > ·O 2 − > ·OH, while ·O 2 − and e − were essential for the reduction of Cr (Ⅵ). Besides, cyclic tests exhibit excellent repeatability and stable structure of CdS/HPA-2/CN after four cycles. Meanwhile, the detailed degradation process of RhB involving de-ethylation, hydroxylation, substitution and decarboxylation was determined according to LC-MS and evaluated by Fukui function calculation. Furthermore, total organic carbon content decreased to 6.2% of the initial value. In this work, as an electron mediator, HPA-2 provides the inspiration for construction of Z-scheme heterojunction , and CdS/HPA-2/CN exhibits enormous potential in the environmental remediation by photocatalysis .
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OPTICAL MATERIALS
·
2022
·
IF 3.754
Tongfei Wu,Bo Hu,Jie Lv,Yunhui Li,Jing Shao,Yuqin Ma,Yuan Cui
Norfloxacin plays an indispensable part in the field of the medical industry, stock raising, and aquaculture. However, excessive use of NOR can induce serious harmful effects on humans and antibiotic resistance of organisms. In this work, a novel fluorescence-enhanced ratiometric fluorescence imprinted sensor was constructed and used to realize selective and accurate detection of NOR. CdTe quantum dots encapsulated in silicon dioxide acted as the reference signal and CDs doped in the imprinted layer as the response signal. Under optimal conditions, NOR rapidly enhanced the fluorescence of CdTe@SiO 2 @FMIPs at 435 nm with 1 min and exhibited excellent linear relationships between the fluorescence enhancement efficiency and the NOR concentration over 10–90 nM with a detection limit of 3.28 nM. Due to the interaction of NOR and CDs through hydrogen bonding as well as π-π conjugation, the visual detection for NOR was achieved by distinguishing the color change from red to bright blue. Satisfied recovery rates of 93.4%–107.7% and RSD of 2.0%–3.6% were gained by actual sample experiments. Furthermore, CdTe@SiO 2 @FMIPs made it possible to reuse at least 5 times.
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Toxics
·
2022
·Vol. 10
·期 7
·367
·
IF 4.472
Dengpeng Wang,Feng Gao,Xianran Wang,Xiaomei Ning,Kaituo Wang,Xinpeng Wang,Yuezhou Wei,Toyohisa Fujita
The detection of heavy metals in aqueous solutions has always attracted much attention from all over the world. A fluorescent probe of CdSe/CdS core-shell quantum dots (QDs) was designed to detect trace Cd2+in aqueous solutions using the OFF–ON mode rapidly and efficiently, likely based on adsorption and desorption reactions between ethylenediaminetetraacetic acid disodium salt (EDTA) and CdSe/CdS QDs. In the OFF mode, the optical shielding function of EDTA results in fluorescence quenching owing to the strong adsorption ability of EDTA with Cd2+on the sites of CdSe/CdS QDs surface. In the ON mode, the introduction of Cd2+promotes the desorption of EDTA from the EDTA-CdSe/CdS QDs and restores the fluorescence intensity. There were two linear response ranges which were 0.1–20 µmol/L and 20–90 µmol/L for the EDTA-CdSe/CdS system to detect Cd2+. The detection limit was 6 nmol/L, and the standard deviation was below 4% for the detection of Cd2+concentration in tap water.Keywords:QDs;fluorescence quenching;fluorescence restore;Cd2+detection;adsorption;desorption
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