Journal of Environmental Chemical Engineering
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2026
·Vol. 14
·期 2
·122015
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IF 7.5
A. Al-Farraji,Saad H. Ammar,Hanan H. Abed,Zaid H. Jabbar
Photocatalytic ozonation is an advanced oxidation process (AOP) that has recently demonstrated its strong oxidation capabilities for efficient wastewater treatment using sunlight and air as the ozone source. Additionally, the spinning disc photocatalytic reactor (SDPR) has been widely adopted recently as an intensification approach for photocatalytic processes. Herein, an efficient approach has been adopted to enhance the degradation performance of photocatalytic ozonation process over CQDs/FeTiO 3 photocatalyst film in a SDPR for synergistically enhancing the degradation of diclofenac sodium (DCF). The DCF degradations were compared in different treatment systems in the SDPR, including ozonation, catalytic-ozonation, photocatalysis, and photocatalytic ozonation. High photocatalytic ozonation performance (99.3% degradation efficiency, 85.8% mineralization, and high stability after six runs) has been acquired over CQDs/FeTiO 3 photocatalyst film under visible-light exposure. The effective separation of photogenerated charge carriers due to CQDs deposition, and high generation of ORS resulting from the combined systems were responsible for the enhanced photocatalytic performance.
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ADVANCED MATERIALS
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2026
·
IF 29.1
Che Liu,Kaiyang Guo,Yan Liu,Huiyin Zheng,Jun Ma,Zhuosen Wang,Xinwei Cui,Yapeng Tian
Efficient proton transport in 2D confined electrodes critically depends on the flexibility of interfacial hydrogen-bond networks. However, the interfacial issue becomes more pronounced in the 2D confined space. The strong hydrogen bonds between confined water molecules and surface ─O terminations of MXenes immobilize protons and hinder charge storage kinetics. Here, we introduce an edge-coordination strategy to achieve precise electronic delocalization modulation in Ti 3 C 2 T x MXene by anchoring carboxyl-functionalized carbon quantum dots (CQDs) at positively charged edges. The CQDs induce substantial electron delocalization on surface ─O sites, which simultaneously weakens rigid hydrogen bonds and facilitates interfacial charge transfer. This regulation establishes a dynamic hydrogen-bond network that supports continuous Grotthuss-type proton migration within the confined channels. Consequently, the optimized CQDs@MXene electrode delivers a volumetric capacitance of 2507.2 F cm −3 , retains 65.8% at 1000 mV s −1 , and maintains nearly 100% stability over 10 000 cycles. In situ vibrational spectroscopy and density functional theory reveal that the electron delocalization drives the weak hydrogen-bond interface and charge transfer coupling governs proton transport kinetics. This work establishes electronic delocalization as an effective paradigm for manipulating hydrogen-bond dynamics and interfacial charge transport for ultrafast ion transport in confined electrochemical systems.
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PubMed
高影响因子
ANALYTICAL LETTERS
·
2025
·
IF 1.8
Hongdan Wang,Xixi Song,Qianqian Wu,Tingting Yu,Ting Lin,Yiran Yu,Zhenxiao Dai,Hongyan Bai
Zeolitic imidazolate framework-67 (ZIF-67) was firstly synthesized using cobalt (II) chloride hexahydrate and 2-methylimidazole. Then, glucose molecules were adsorbed into the ZIF-67 microporous structure and ZIF-67 loaded with carbon quantum dots (CQDs-ZIF-67) were synthesized by low-temperature calcination. CQDs-ZIF-67 and nickel chloride hexahydrate (II) were dissolved in anhydrous ethanol and CQDs/Co2(OH)3Cl/NiCl(OH) nanocomposites were synthesized by a hydrothermal method. A nonenzymatic glucose electrochemical sensor based on a glassy carbon electrode (GCE) modified by CQDs/Co2(OH)3Cl/NiCl(OH) was constructed and exhibited a wider linear range and a lower detection limit for glucose detection due to the abundant pore structure and good electrocatalytic activity of CQDs/Co2(OH)3Cl/NiCl(OH).
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Food Bioscience
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2025
·
IF 5.9
Wenyuchu Chen,Fang Tian,Yongjing Xu,Yujin Li,Weiliang Guan,Chenyang Lu,Sheng Hu,Luyun Cai
Fish oils (FOs) are rich in omega-3 polyunsaturated fatty acids, which provide several health benefits. However, their oral bioavailability and stability are often limited due to the oxidation of polyunsaturated fatty acids, which degrade the oil's nutritional and sensory properties over time. In this study, FO microcapsules were prepared using pea protein isolate (PPI), β-cyclodextrin (β-CD), and carbon quantum dots (CQDs) as wall materials through a freeze-drying method. The results demonstrated that the use of PPI/β-CD/CQDs composite significantly improved the encapsulation efficiency, stability, and antioxidant properties of the microcapsules, suggesting a promising approach for enhancing the shelf-life and health benefits of fish oil. Additionally, the peroxide value (POV) and thiobarbituric acid (TBA) values of the microcapsules increased with temperature and storage time. Notably, the incorporation of CQDs markedly improved the antioxidant properties of the microcapsules, thereby extending their storage stability. In vitro gastrointestinal digestion simulations demonstrated that microencapsulation facilitated the absorption of beneficial substances in fish oil within the human gut. This study offers valuable insights into the development of more efficient fish oil microcapsules for potential applications in food and pharmaceutical applications.
研究领域:
食品科学
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营养学
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高影响因子
APPLIED SURFACE SCIENCE
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2021
·
IF 6.707
Hailan Qin,Yushan Zhang,Shuaijun He,Zeyu Guan,Yintao Shi,Xinyi Xie,Dongsheng Xia,Dongya Li,Haiming Xu
Increasing the migration and separation efficiencies of photogenerated carriers can enormously enhance photocatalytic properties. Thus, a novel CQDs/BiOCl nanocomposite with rich oxygen vacancies (OVs) was effectively synthesized via a hydrothermal method by using maltitol as a carbon source to address these issues. The photocatalysts were characterized by XRD, SEM, TEM, FT-IR, BET, XPS, PL, EIS, I-t, DRS and ESR. The experimental results demonstrate that BOC-1 can purify 72% tetracycline hydrochloride (10 mg/L, TC-HCl) within 60 min, which is 4 times higher than pure BiOCl. Moreover, photocatalytic mechanism was thoroughly studied and verified that the cooperation of point discharge effect (PDE) and rational OVs concentration induced by carbon quantum dots (CQDs) can significantly enhance the migration and separation of photo-induced carriers, thereby leading to high photocatalytic activity of the as-prepared nanocomposites. In addition, the contribution of the free radicals was comprehensively calculated based on trapping experiments. the contributions of ·OH, ·O 2 - and 1 O 2 are 6.38%, 48.94% and 8.51%, respectively. This study provides a promising strategy to boosting the photoinduced carrier transfer properties by the coupling of point discharge effect and defect engineering.
研究领域:
材料科学
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环境科学
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NANO
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2020
·
IF 1.566
Bin Chen,Jialu Zhang,Yan Zhang,Lijing Zhu,Haichao Zhao
Herein, carbon quantum dots (CQDs) and gold nanoparticles (Au NPs) were synthesized and deposited on the surface of Polysulfone (PSF) membrane using polydopamine as the sublayer, resulting in excellent antibacterial property and photocatalytic activity for degradation of organic dyes. Water contact angle (WCA) of the membrane before and after surface modification dropped from 9 3 . 9 ∘ to 5 8 . 4 ∘ , due to outstanding hydrophilicity of CQDs. The antibacterial test against E . c o l i found that the CQDs/Au NPs were beneficial to improve the antibacterial property of the membrane, and the antibacterial rate could reach 90%, effectively prolonging the service life of the membrane. In addition, the adsorption of bovine serum albumin (BSA) molecules on the membrane was significantly reduced, and the irreversible fouling ratio also decreased from 41.3% to 10.7%. On the other hand, the CQDs/Au NPs layer was used as a photocatalytic material for degradation of methylene blue.
研究领域:
材料科学
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环境科学
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生物医学工程
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高影响因子
VACUUM
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2019
·
IF 2.515
Xing Gao,Tat Thang Nguyen,Xinchao Gong,Xueqi Chen,Zihui Song,Wenxin Du,Rusong Chai,Minghui Guo
In this study, Ce x Zr 1−x O 2 solid-solution oxide (x = 0.7) was prepared using hydrothermal method , and the obtained Ce 0.7 Zr 0.3 O 2 nanoparticles were modified with wood–based carbon quantum dots (CQDs). Furthermore, we report a composite photocatalyst of vacuum heat-treated CQDs/Ce 0.7 Zr 0.3 O 2 for degrading methylene blue. The structural properties and photocatalytic activity of CQDs/Ce 0.7 Zr 0.3 O 2 were systematically studied after vacuum heat treatment. Herein, a part of the functional groups present on CQD surfaces changed through high–temperature heating during vacuum heat treatment. The dominant structures sp 2 hybrid carbon atoms and amorphous carbon were transformed to defect states of sp 3 hybrid oxygen atoms, thus increasing the surface oxygen vacancy concentration. The high activity and excellent stability of vacuum heat-treated CQDs/Ce 0.7 Zr 0.3 O 2 system can be attributed to increased surface oxygen vacancy concentration, modification of CQDs, and the protruding structure of Ce 0.7 Zr 0.3 O 2 , contributing to efficient charge transfer. This study provides potential systems of CQD-modified photocatalysts and also reveals the substantial effect of vacuum heat treatment on enhancing the photocatalytic properties of composites.
研究领域:
材料科学
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环境科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Xianbo Sun,Weiyu He,Tao Yang,Haodong Ji,Wen Liu,Juying Lei,Yongdi Liu,Zhengqing Cai
A highly solar active nanocomposite with sheet-like WO 3 skeleton and evenly loaded TiO 2 and carbon quantum dots (CQDs) was synthesized by facile hydrothermal-calcining process, which showed 3.1- and 46.6- times activity on antibiotic (cephalexin) degradation than TiO 2 and WO 3 , respectively. The construction of TiO 2 /WO 3 heterojunction narrowed the band gap and facilitated the electrons-holes separation. The π conjugated CQDs was found to further improve the charge separation and extend the visible light response by photosensitization. However, the promoted charge separation predominantly contributed to the improved photocatalytic activity. The contributions of detected reactive species follows the order of: O 2 – > 1 O 2 > OH> h + . The cephalexin degradation mechanism and pathway were proposed based on DFT (density functional theory) calculation and experimental analysis. The photocatalytic mineralization efficiency can reach 92.4% in 4 h, indicating the efficient reduction of ecotoxicity of cephalexin and its intermediates. This new composite proved to have great potentials for emerging contaminants degradation in water.
研究领域:
环境科学
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材料科学
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SEPARATION AND PURIFICATION TECHNOLOGY
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2016
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IF 3.299
Yuanzhi Hong,Yadong Meng,Guangyi Zhang,Bingxin Yin,Yong Zhao,Weidong Shi,Changsheng Li
Novel carbon quantum dots (CQDs)/graphitic-like carbon nitride (g-C 3 N 4 ) metal-free heterojunctions were firstly synthesized via a facile low temperature process. Multiple physicochemical techniques were carried out to characterize the samples. The CQDs with the average size of about 5 nm are attached to the surfaces of g-C 3 N 4 nanosheets. The photocatalytic activity of as-prepared samples was carefully evaluated by the degradation of rhodamine B (RhB) and tetracycline hydrochloride (TC-HCl) under visible light irradiation. Photocatalysis result displayed that the CQDs/g-C 3 N 4 heterojunctions can significantly enhance visible-light photocatalytic activity in compared to that of pristine g-C 3 N 4 . The reaction rate constant of the optimum active C0.50%/CN heterojunction for the photodegradation of RhB and TC-HCl were about 3.7-fold and 1.9-fold higher than that of bare g-C 3 N 4 , respectively. The efficiently enhanced photoactivity was attributed to the CQDs not only can improve the photogenerated electron–hole pair’s separation, but also can increase light harvesting by the up-conversion photoluminescence behavior. Moreover, the as-prepared C0.50%/CN sample also exhibited excellent photostability and recyclability for both photodegradation of RhB and TC-HCl. In addition, the possible enhanced photocatalytic mechanism was proposed and analyzed by the active species trapping experiments. This work will bring about potential for application in environmental purification and useful for designing other CQDs-based photocatalyst in energy conversion.
研究领域:
材料科学
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环境科学
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高影响因子
CHINESE CHEMICAL LETTERS
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2020
·
IF 4.632
Yongjie Li,Wei Xiang,Tao Zhou,Mingjie Huang,Chen Wang,Xiaohui Wu,Juan Mao,Penghua Wang
In this study, a carbon quantum dots modified maghemite catalyst (CQDs@ γ -Fe 2 O 3 ) has been synthesized by a one-step solvothermal method for efficient persulfate (PDS) activation under visible light irradiation. Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and UV–vis diffuse reflectance spectroscopy (UV–vis DRS) characterization indicated that the formation of heterojunction structure between CQDs and γ -Fe 2 O 3 effectively reduced the catalyst band gap ( E g ), favoring the separation rate of electrons and holes, leading to remarkable efficient sulfamethoxazole (SMX) degradation as compared to the dark-CQDs@ γ -Fe 2 O 3 /PDS and vis- γ -Fe 2 O 3 /PDS systems. The evolution of dissolved irons also demonstrated that CQDs could accelerate the in-situ reduction of surface-bounded Fe 3+ . Electron paramagnetic resonance (EPR) and radical scavenging experiments demonstrated that both OH and SO 4 − were generated in the reaction system, while OH was relatively more dominant than SO 4 − for SMX degradation. Finally, the reaction mechanism in the vis-CQDs@ γ -Fe 2 O 3 /PDS system was proposed involving an effective and accelerated heterogeneous-homogeneous iron cycle. CQDs would enrich the photo-generated electrons from γ -Fe 2 O 3 , causing efficient interfacial generation of surface-bond Fe 2+ and reduction of adsorbed Fe 3+ . This visible light induced iron cycle would eventually lead to effective activation of PDS as well as the efficient degradation of SMX.
研究领域:
环境科学
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材料科学
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高影响因子
Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 3
·671-685
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IF 5.819
Juan Cui,Jianghui Liu,Xunfeng Xia,Xu Chai,Huahua Guo,Jianfeng Gao,Shengwang Gao
A porous carbon quantum dots (CQDs)–SrTiO3/graphene material (CSG) was synthesized using a novel sol–gel carbonized propagation method (SCPM). In this method, the prepared gel was first immersed in an organic solvent with low-temperature self-propagating properties, and after being ignited, the product is obtained through carbonized propagation processes. Various characterization studies showed that CQDs, SrTiO3 and graphene can be combined through the SCPM, and CQDs and SrTiO3 form a heterojunction on the surface of the material, which is conducive to the recovery of the photocatalyst and improvement of the photocatalytic performance. The existence of a reducing atmosphere resulted in the occurrence of the doping process of CQDs. Photocatalytic degradation experiments showed that, with the increase of ethanol consumption, the catalytic performance tends to be stable. CSG-5, which consumes 80 mL of ethanol, has the best effect on MB degradation. When the dosage is 1.5 g L−1 and the concentration of MB is 5 mg L−1, the degradation rate is 94%. h+ and ˙O2− played a major role in the degradation system of CSG-5. UPLC-MS/MS results showed that 8 kinds of intermediates were produced during the degradation process. The special structure and preparation method of CSG-5 might help to prepare better photocatalysts.
研究领域:
材料科学
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环境科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Jiajun Yu,Xiao Wang,Lu Chen,Guanhong Lu,Gansheng Shi,Xiaofeng Xie,Yan Wang,Jing Sun
The development of photocatalytic materials with both promising adsorption capacity and high visible-light activity is essential for the highly-efficient and stable photocatalytic degradation of toluene. In this work, a series of carbon quantum dots (CQDs) decorated UiO-66 metal–organic-frameworks gel (MOG) composites (CQDs/UiO-66 MOG) with hierarchical pore structures were prepared. The introduction of CQDs effectively improved the light utilization and promoted the separation of photo-induced electrons and holes, which were beneficial for the generation of active free radicals. Besides, benefiting from the hierarchical pore structure of UiO-66 MOG and the new adsorption sites provided by CQDs, 0.5 wt% CQDs/UiO-66 MOG showed a high toluene adsorption capacity (29.06 μmol/g) and its enhanced degradation efficiency for toluene was 4.4 times higher than that of pristine UiO-66 MOG. Both in-situ Fourier transform infrared (FTIR) and Gas Chromatography–Mass Spectrometer (GC–MS) were conducted to give the possible degradation pathways. Toluene was firstly converted into xylene and benzene, and then degraded into acids, aldehydes, alcohols before fully mineralized into carbon dioxide. A relatively high CO 2 conversion ratio (85%) of toluene was obtained when applying 0.5 wt% CQDs/UiO-66 MOG as the photocatalyst, together with less intermediates detected, confirming the positive role of CQDs decoration in the effective mineralization of toluene. This work sheds new light on MOG material optimization and degradation of low-concentration flowing toluene.
研究领域:
材料科学
·
环境科学
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高影响因子
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