TALANTA
·
2024
·
IF 5.6
Zhiquan An,Xiaoyu Jian,Wenjun Hong,Xilong Zhang,Jiateng Ma,Minjie Li,Bihong Zhang,Liang-Hong Guo
Dibutyl phthalate (DBP), a common and outstanding plasticizer, exhibits estrogenic, mutagenic, carcinogenic, and teratogenic properties. It is easily liberated from plastic materials and pollutes aquatic ecosystems, endangering human health. Therefore, highly sensitive and selective DBP detection methods are necessary. In this work, a free-of-electronic sacrificial agent photoelectrochemical (PEC) aptasensor for DBP detection was constructed using a novel Z-scheme Bi-doped BiOI/Bi 2 S 3 (Bi-BIS) p-n heterojunction. The Bi-BIS composites had higher visible-light absorption, charge transfer, and separation efficiency. This is attributed to the synergistic effect of the formation of Z-scheme p-n heterojunction between BiOI and Bi 2 S 3 , the plasma resonance effect of metallic Bi and photosensitization of Bi 2 S 3 , thus exhibiting large and stable photocurrent response in the absence of electron sacrificial agent, that was 10.4 and 6.4 times higher than that of BiOI and Bi 2 S 3 , respectively. Then, a DBP PEC aptasensor was constructed by modifying the DBP aptamer on the surface of the ITO/Bi-BIS electrode. The aptasensor demonstrated a broad linear range (2–500 pM) and a low detection limit (0.184 pM). What's more, because there is no interference from electronic sacrificial agent, the aptasensor exhibited excellent selectivity in real water samples. Therefore, the proposed PEC has considerable potential for DBP monitoring.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yilin Wang,Xi Tang,Zixia Zhao,Zhifang Liu,Caiyu Ge,Kunxiang Deng,Yixi Xie,Pengcheng Zhao,Junjie Fei
Tert -Butylhydroquinone (TBHQ) is a phenolic antioxidant commonly found in edible oils. However, excessive amounts of TBHQ can adversely affect food quality due to its toxic and mutagenic effects, which may cause human injury and present carcinogenic risks. Thus, there is an urgent need to develop a sensitive and accurate analytical method for the rapid detection of TBHQ. In this work, hierarchical flower-structured spherical SnIn 4 S 8 and pyramidal Bi 2 O 3 were combined to obtain the Z-scheme SnIn 4 S 8 /Bi 2 O 3 heterojunction. Under irradiation, the electron transport channel of this heterojunction facilitated the combination of electrons in the conduction band of Bi 2 O 3 with holes in the valence band of SnIn 4 S 8 , which decreased the recombination rate of photogenerated electrons and improved the photoelectric response. After the addition of TBHQ, the adsorption effect on the electrode surface and the oxidation reaction with holes in the valence band of Bi 2 O 3 further promoted the charge transfer and separation of photogenerated electrons and holes, which led to a rapid increase in the photocurrent to realize the detection of TBHQ in environmental and food samples. The increase in photocurrent has been linearly correlated with the logarithm of the concentration of TBHQ in the range of 1.00–500 μM with a limit of detection of 0.526 μM. Furthermore, the sensor showed excellent selectivity in the presence of a wide range of analogs. This study provides a novel scheme for the precise detection of TBHQ and the construction of high-performance photoelectrochemical Z-scheme heterojunctions.
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CHEMOSPHERE
·
2025
·
IF 8.1
Xinyao Wang,Zhiling Huang,Yue Meng,Bo Xie,Zheming Ni,Shengjie Xia
In this paper, ZnCdS/ZnCr-LDHs Z-scheme heterojunction containing zinc-oxygen bi-vacancy (V Zn + O ) were constructed and applied to photodegradation of norfloxacin (NOR) in water. A comprehensive investigation was conducted into the effects of concentration of V Zn in the composite, amount of catalyst, concentration of norfloxacin, temperature of the solution, and pH on the degradation activity. It comprehensively investigates the reaction kinetics, establishing a complete kinetic equation and determining the activation energy. Key parameters including catalyst dosage, pH, and reaction orders are systematically analyzed to elucidate their influence on the reaction process. The reaction mechanism of photodegradation of NOR is deeply analyzed from the perspectives of thermodynamics and kinetics. Z-scheme heterojunction not only facilitates the separation of photogenerated charges, but also preserves photogenerated electrons with strong reducing ability and photogenerated holes with high oxidizing ability; The existence of double vacancies not only provides more active sites for the material, but also regulates the band structure of the material, which contributes to the generation of free radicals. The synergistic effect of Z-scheme heterojunction and V Zn + O resulted in a removal rate of 89 % for NOR with a concentration of 20 mg/L after 90 min of visible light irradiation. In addition, based on ESR and XPS test results as well as DFT calculations, the synergistic mechanism of Z-scheme heterojunction and V Zn + O in the photodegradation process was analyzed in detail from the aspects of band structure, electron transfer, free radical species, and built-in electric field. The pathway of NOR photodegradation and the toxicity analysis of intermediate products were also provided.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12763-12778
·
IF 4
Qi Wen,Di Li,Chunyan Gao,Yuhang Xue,Lei Wu,Fang Song,Jun Zhou
In this paper, ultra-thin nanofiber PDI was obtained by self-assembly dispersion of commercial PDINH. A novel Co/Ni-MOF-74@PDI Z-scheme heterojunction photocatalyst material was constructed by a simple solvothermal method. XRD, SEM, TEM, FT-IR and other characterization techniques proved the successful preparation of the Co/Ni-MOF-74@PDI Z-scheme heterojunction photocatalyst material. By degrading chlortetracycline hydrochloride, it was found that the photocatalytic activity of Co/Ni-MOF-74@PDI was much higher than that of pure Co/Ni-MOF-74 and PDI. Subsequently, Co/Ni-MOF-74@PDI was used to activate H2O2 to further improve the degradation efficiency of chlortetracycline hydrochloride. It was found that the photocatalytic performance was greatly improved after the addition of 19.6 mM H2O2 to the system, and the degradation rate of chlortetracycline hydrochloride was 87% within 90 min. The electron transfer pathway and H2O2 activation mechanism of the Co/Ni-MOF-74@PDI composite photocatalyst were proved by free radical quenching experiments, electron paramagnetic resonance analysis and X-ray electron spectroscopy. Finally, the easy exfoliation point and degradation pathway of chlortetracycline hydrochloride were studied using density functional theory, UPLC-MS and toxicity evaluation software. It was found that the main active substances were h+, ˙O2, 1O2 and ˙OH, and the toxicity of chlortetracycline hydrochloride and its intermediates was evaluated.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xiaoya Gao,Guangbei Tang,Wen Peng,Qian Guo,Yongming Luo
Phosphate modification is a general strategy for improving the photocatalytic activities of semiconductors. Ion exchange can be occurred during the phosphate modification process. This would give a surprise for a new phase formed on the surface of the parent photocatalyst. More importantly, this is conductive to form close contact and continuous interface favoring the charge transfer between two phases. Here, a novel BiOCl-OV-BiPO 4 photocatalyst was fabricated using a facile in situ phosphate modification method. BiOCl-OV-BiPO 4 displayed a maximum carbamazepine (CBZ) degradation efficiency of 81.70% after 30 min Xe lamp irradiation, with a reaction kinetics rate constant ( k ) of 5.75 times higher than ordinary BiOCl samples. Oxygen vacancy (OV) is important for the construction of Z-scheme BiOCl-OV-BiPO 4 : OV benefits the generation of BiPO 4 on the surface of BiOCl; furthermore, OV acting as electron mediator, promotes the separation of photogenerated charge carriers between BiOCl and BiPO 4. Based on the results from PL tests, photocurrent density, EIS Nyquist plots, and cyclic voltammetry, it can be demonstrated that Z-scheme structure of BiOCl-OV-BiPO 4 not only increases the photogenerated electrons-holes separation rate but also retains their strong redox ability. This significantly facilitates the production of superoxide radical (O 2 − ) and holes ( h + ), which dominates the CBZ photodegradation. This work provides a new sight for the fabrication of Z-scheme photocatalysts to improve the photocatalytic performance.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiamin Wei,Qing Wang,Mian He,Shuai Li,Yunan Zhang,Yang Yang,Shipeng Luo,Lianshe Fu,Xin Wang,Tinghai Yang
The development of highly efficient strategy to facilitate comprehensive charge transmission and effective spatial charge separation is expected as a promising approach to improve photocatalytic performance. Herein, the Fe(III) doping modified AgI/NH 2 -MIL-68(In/Fe) Z-scheme heterojunction (ANM-x composite) with unique internal and interfacial charge transmission performance was fabricated by a facile ion exchange precipitation method. The optimized ANM-50 composite exhibits the maximum photocatalytic activity for the degradation of tetracycline, which is about 9.54, 2.61 and 1.86 times higher than that of pure NH 2 -MIL-68In, NH 2 -MIL-68(In/Fe) and AgI, respectively. The characterization results displayed that Ag nanoparticles (NPs) were generated during the photocatalytic procedure, which not only served as a charge transfer-highway, but also reduced the charge flow energy barrier, thereby accelerating charge transfer efficiency and consolidating the stability of the Z-scheme heterojunction. Mechanism exploration reflected that the superior photocatalytic performance was associated with synergetic effect among the introduced Fe(III), constructed ANM Z-scheme heterojunction and the generated Ag NPs, which significantly expands visible light response range and promotes more effective internal and interfacial charge separation. This research not only designs an efficient photocatalyst for decomposing tetracycline, but also opens a new perspective for rational developing Z-scheme heterojunction with unique internal and interfacial charge flow steering.
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Journal of Environmental Sciences
·
2020
·
IF 4.302
Qian Guo,Guangbei Tang,Wenjie Zhu,Yongming Luo,Xiaoya Gao
Pyrite is the most abundant sulfide semiconductor mineral with excellent optical properties . However, few reports have investigated its photocatalytic activity because of the low photogenerated carrier separation efficiency. In this work, a Z-scheme FeS 2 /Fe 2 O 3 composite photocatalyst was fabricated in situ via structural transformation of pyrite through heat treatment. A remarkably enhanced photocatalytic performance was observed over the FeS 2 /Fe 2 O 3 composite photocatalyst. Compared with the pristine pyrite, the degradation efficiency of carbamazepine (CBZ) reached 65% at the added hexavalent chromium (Cr(Ⅵ)) concentration of 20 mg/L and the Cr(Ⅵ) was nearly completely reduced in the mixed system using FeS 2 /Fe 2 O 3 within 30 min under simulated solar light irradiation. The enhanced photocatalytic activity can be attributed to the efficient separation and transfer of photogenerated carriers in the FeS 2 /Fe 2 O 3 composite photocatalyst. This facilitated the generation of •OH, hole (h + ) and •O 2 − species, which participated in the photocatalytic reaction with CBZ. Based on the measurement of the active species and electric properties, a Z-scheme electron transfer pathway was proposed for the FeS 2 /Fe 2 O 3 composite photocatalyst. This work broadens the application potential of pyrite in environmental remediation.
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CHEMOSPHERE
·
2025
·
IF 8.1
Si-yuan He,Wei Wen,Peng Wu,Zhe Meng
Developing a green and efficient technology for decomposing aflatoxin B 1 (AFB 1 ) and ochratoxin A (OTA) in grains has important theoretical value and application prospects for ensuring food safety. A dual Z-scheme ternary heterojunction photocatalyst, Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ /BiVO 4 /NH 2 -UiO-66 (SBN), was prepared via a self-assembling hydrothermal approach. The SBN heterojunction photocatalyst exhibits round-the-clock photocatalytic activity due to the intrinsic light source of Sr 2 MgSi 2 O 7 : Eu 2+ , Dy 3+ (SMS). Dual Z-scheme mechanism was proposed and validated through detailed analysis of quenching experiments, ESR spectra, band arrangement, and charge transfer processes. The dual Z-scheme mechanism not only promotes the effective transfer and separation of photo generated charge carriers during charge carrier transport, but also maintains significant reduction and oxidation potentials. SBN photocatalyst exhibits stable and persistent photocatalytic performance, significantly enhancing the degradation efficiency of AFB 1 and OTA under all-weather conditions. Experimental data shows that the removal rate of AFB 1 increased from 69.60 % after 60 min of illumination to 83.9 % after 4 h of turning off the light source; At the same time, the removal rate of OTA increased from 64.8 % to 78.1 %. •O 2 − and •OH were identified as key active species in photocatalytic reactions. Based on the analysis of AFB 1 and OTA degradation intermediates and the prediction of degradation sites using density functional theory (DFT), degradation pathways for AFB 1 and OTA were proposed. Collectively, these findings suggest a highly promising practical approach for the detoxification of mycotoxins in grain commodities.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Xi Wu,Xiangyu Wang,Yu Xie,Nanqi Ren,Jun Ma,Ping Ning
This research provides a innovatively designed mechanism of activating the passivation layer on Fe 0 surface as semiconductor to construct a Z-scheme heterojunction in-situ for high-efficiency environmental remediation. Aggregation and passivation of Fe 0 and poor visible-light absorption of TiO 2 were simultaneously improved by the facile synthesis of a recyclable Fe 0 @black-TiO 2 Z-scheme heterojunction without high-temperature hydrogen atmosphere. The results showed that tetracycline (TC) degradation efficiency with Fe 0 @black-TiO 2 was 1.23 and 2.63 times higher than that of pristine Fe 0 and black-TiO 2 , respectively. The superior degradation arose from strong reduction ability of highly dispersed Fe 0 and in-situ constructed Z-scheme heterojunctions. High dispersion of Fe 0 , construction of the heterojunction, enhanced photodegradability of Fe 0 @black-TiO 2 were systematically elucidated by multiple characterization techniques. Furthermore, photodegradation pathways of TC based on the role of •O 2 - and •OH were identified. Our results have provided the necessary inspiration and guidance for the development and application prospect of Fe 0 @black-TiO 2 in environmental remediation.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Kunxiang Deng,Yasen Wang,Yilin Wang,Zhifang Liu,Xinyi Li,Yixi Xie,Haoran Guo,Pengcheng Zhao,Junjie Fei
Chlorpyrifos (CPF) is widely utilized in agricultural practices, and its residue in food raise significant concerns food safety. However, current detection methods often suffer from complex operation procedures and unstable signal responses. Therefore, there is an urgent need to develop a reliable sensor for detecting CPF residue in food samples. In this work, a Z-scheme heterojunction was formed using hollow In 2 O 3 (H-In 2 O 3 ) and Bi 2 WO 6 nanosheets. The staggered band structure of the H-In 2 O 3 /Bi 2 WO 6 heterojunction facilitates carrier separation and transfer, thereby enhancing the sensor's response. In the presence of CPF, it reacts with · OH radicals generated by the heterojunction, further amplifying the signal. The sensor exhibits a linear response in the range of 5–700 nM with a limit of detection (LOD) of 0.72 nM. In addition, this photoelectrochemical sensor demonstrates satisfactory stability, anti-interference, selectivity and reproducibility, showing great potential for CPF analysis in real samples.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yanchen Zhu,Kun Liu,Peng Fu,Linli Qin,Lulu Zhu,Wenyang Xu,Hao Ren,Huamin Zhai
The integration of photo-Fenton catalysis couple oxygen reduction reaction (ORR) has shown significant advantages in industrial water-pollution treatment. In this work, a ternary heterojunction catalyst (Ag@FeCo 2 O 4 /Defective-BiOBr, AFB) with rich oxygen vacancies (OVs) was developed by integrating defect engineering, Z-scheme heterojunction, and Ag surface plasmon for light/dark dual-mode pollutants degradation. A unique “three-channel” electron transfer mechanism was designed for the first time, enabling the enhanced electron migration dynamics. The density functional theory (DFT) theoretical calculation revealed that Fe/Co diatomic doping structure and OVs significantly reduced the H 2 O 2 activation energy, facilitating the radical formation. Under light irradiation, AFB exhibited efficient degradation (98.5 %, 40 min, pH = 3.0) of real-industrial pollutants driven by photo-Fenton degradation. Even in dark condition, AFB also showed the dark degradation capability, enabling 89.5 % degradation by Ag-catalyzed oxygen reduction reaction (ORR). Benefiting from this, AFB showed features of efficient degradation capability, wide applicability (light/dark dual-mode, pH = 3.0 ∼ 9.0), and full-day operation ability. Significantly, stability tests collectively indicated excellent stability in structure and environment resistance, as high as stable regeneration (over 90 % efficiency after five recycles), further supporting its potential in real system. This work provided a unique design and mechanistic insights of new material paradigm in sustainable AOP environment remediation, and supported for the self-adaptive response removal of challenging pollutions.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 21.1
Zhixiong Yang,Xinyue Liu,Xiaobin Hao,Haibo Yin,Yuan Li,Gaoke Zhang
Conventional methods often construct heterojunctions with lattice mismatch and disordered interfaces, suppressing interfacial charge-transfer and weakening photocatalytic activity. Although epitaxial construction could obtain lattice-matched heterojunctions and then boost their carrier separation, constructing such structures under mild conditions remains challenging. Herein, we successfully prepare a lattice matched NaBiO 3 /Bi 2 O 2 CO 3 (NBO/BOC) of 95.8% by a facile bicarbonate (HCO 3 - )-triggered in-situ epitaxial strategy, which removes 98.2% metronidazole, representing an 8.25-fold enhancement over the HCO 3 - -free control, with an apparent reaction rate constant of 0.004 min -1 . Detailed characterizations and experiments results demonstrate that this high removal activity derives from the highly lattice-matched of NBO/BOC heterojunction. That is, the lattice-matched heterointerface in NBO/BOC ensures efficient Z-scheme band coupling and enhances interfacial charge transfer under the coordination of the built-in electric field, boosting photocatalytic degradation activity of the pollutant. These findings demonstrate a sustainable strategy that leverages an inherent wastewater component to self-construct efficient photocatalytic heterojunctions for pollutant degradation.
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