Journal of Environmental Sciences
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2020
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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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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
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IF 4.7
Chang Feng,Yuhong Lin,Yadong Zheng,Zhuoyuan Chen,Jiangping Jing,Li Ma,Jian Hou
Lattice regulation and defect engineering are proven effective strategies to enhance the photocatalytic performance of semiconductor photocatalysts, and have thus garnered extensive research attention in the field of photocatalysis. Therefore, the design of photocatalysts with the synergistic effects of lattice distortion and defect states has emerged as a research priority. In this work, an indium (in)-doped cadmium sulfide (InCdS) photocatalyst was fabricated via a facile water bath method. The lattice distortion and sulfur (S) vacancy induced by in doping, and the photocatalytic Cr(VI) reduction performance of InCdS were systematically investigated. The results demonstrated that in doping not only triggered lattice distortion in CdS but also significantly elevated its S vacancy concentration. Meanwhile, the introduction of in 3+ selectively suppressed the growth of the CdS (200) crystal plane, which induced the morphological transformation of CdS from nanosheets to uniform spherical nanoclusters and remarkably enhanced its specific surface area. The synergistic effect of lattice distortion and S vacancies significantly promotes the separation efficiency of photogenerated carriers in InCdS, thereby enhancing its photocatalytic performance for Cr(VI) reduction. Specifically, 5 %InCdS achieves complete reduction of 30 mg⋅L −1 Cr(VI) within merely 25 min under visible light irradiation, and its reaction rate constant is 15.26 times that of pure CdS. More importantly, 5 %InCdS exhibits excellent stability during the photocatalytic Cr(VI) reduction process. Further mechanistic analysis reveals that photogenerated electrons serve as the dominant active species responsible for the photocatalytic Cr(VI) reduction reaction. This work provides a theoretical basis for the development and design of high-efficiency photocatalysts via simple synthesis strategies that induce lattice distortion and S vacancies, thereby offering new insights into their practical application in the treatment of Cr-containing wastewater
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MICROCHEMICAL JOURNAL
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2026
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IF 5.2
Xu Xu,Yumeng Liu,Jia Lv,Baocheng Ji,Junguang Li,Ke Li,Dianbo Zhao,Yanhong Bai
A modified QuEChERS method was developed in analysis of 52 veterinary drugs. • A novel MIL-101(Cr)–rGO@melamine sponge composite was fabricated. • The fast matrix purification could be achieved within several seconds. • Matrix cleanup was achieved through simple soaking and squeezing. • The method showed low matrix effects, good recoveries, and high precision. Herein, we report the fabrication of an elastic, quick, easy, cheap, effective, rugged, and safe adsorbent using a functionalized melamine sponge (MLS) and used it for the high-throughput analysis of 52 veterinary drugs in beef liver samples via ultraperformance liquid chromatography–tandem mass spectrometry. The as-prepared adsorbent was obtained by successive loading of Matérial Institut Lavoisier-101 (Chromium) [MIL-101(Cr)] and reduced graphene oxide (rGO) on melamine sponge skeletons. Excellent linearity with determination coefficients of ≥0.9942 was obtained across a range of 0.25–200 μg·kg −1 . Relatively low limits of detection (0.1–4.9 μg·kg −1 ) and limit of quantitation (LOQ; 0.3–16.2 μg·kg −1 ) were obtained. When fortified at three levels (1×, 5×, and 10× LOQ), spiked recoveries varied between 63.5% and 115.4%, with the intraday and interday relative standard deviations of ≤12.9%. Through direct infiltration and compression, efficient matrix purification was accomplished within seconds, yielding negligible matrix effects (from −18.4% to +19.1%). Thus, the MIL-101(Cr)–rGO@MLS adsorbent possesses high potential for fast, convenient, and efficient matrix purification in complex sample analysis. Download: Download high-res image (179KB) Download: Download full-size image
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Journal of Energy Chemistry
·
2026
·
IF 15.6
Xue Ye,Yangzhou Xu,Peipei Zhang,Dongwang Zhu,Zhicheng Chen,Yudong Xia,Fulin Yang,Xinhua Gao,Jie Li
CO 2 hydrogenation to methanol is one of the most promising pathways for emission reduction. Unlike traditional synthesis gas (CO + H 2 ) to methanol, a major challenge is that the activation of inert CO 2 at high temperature will induce the reverse water-gas shift (RWGS) reaction to generate CO, thereby reducing the methanol yield. In this research, a novel catalyst Cu 7 Zn 3 Cr 0.3 was synthesized by the carbon microsphere-assisted sol-gel method, which remarkably achieved a maximum methanol space-time yield of 345.1 g kg cat −1 h −1 under mild conditions (200 °C, 3.0 MPa, and 21600 mL g cat −1 h −1 ). Characterizations combined with theoretical simulations show that Cr doping can affect the crystal structure of ZnO, resulting in the formation of more oxygen vacancies (O V s), and induce Cu to form a stable Cu 0 -O V -Cu + active center at the interface. This active structure efficiently enhances the adsorption and activation of CO 2 , while changing the reaction path to inhibit the production of CO. The results indicate that there is a clear linear relationship between the Cu + and O V s concentration and methanol yield, which could provide experimental references for the development of high-performance catalysts for CO 2 methanol production.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Pengfei Zhu,Xiaolong Wu,Xingyang Xiao,Ming Duan,Dan Luo,Jinru Lin
In this work, Bi 12 O 17 Cl 2 and ZIF-8 were synthesized via a facile in-situ precipitation method, while ZnO-CN was obtained through the pyrolysis of ZIF-8. Then, a novel Bi 12 O 17 Cl 2 /ZnO-CN composite catalyst with Z-scheme heterojunction was prepared by mechanical mixing-low temperature activation method. When the ZnO-CN is pyrolyzed at 550 ℃ and accounts for 10 wt% in the Bi 12 O 17 Cl 2 /ZnO-CN composite, the composite exhibited a significantly higher degradation rate for levofloxacin hydrochloride (LVX) (94.50%) compared to Bi 12 O 17 Cl 2 (67.30%) and ZnO-CN (36.80%), while also achieving a high removal rate of Cr(VI) under acidic conditions (92.00%). And the toxicity of LVX to wheat decreased significantly after photocatalytic degradation. Meanwhile, the Bi 12 O 17 Cl 2 /ZnO-CN has good universality, salt resistance and reuse stability. The experimental results of sample characterization show that the improved photocatalytic performance of Bi 12 O 17 Cl 2 /ZnO-CN composite can be attributed to the high-efficiency separation of electron-hole pairs (e - -h + ), enhanced light absorption in the visible region, increased specific surface area and active sites. Both the free radical capture experiment and electron paramagnetic resonance (EPR) test indicate that •O 2 - and h + are the primary active species in the process of degrading LVX by Bi 12 O 17 Cl 2 /ZnO-CN. Combined with mechanism exploration experiment and iquid chromatography-mass spectrometry (LC-MS) analysis, a possible direct Z-scheme heterojunction electron transfer mechanism and photocatalytic degradation pathways for LVX was proposed. This work enhances the photocatalytic performance of Bi 12 O 17 Cl 2 and provides an idea for antibiotic or Cr(VI) wastewater treatment.
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TALANTA
·
2022
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IF 6.556
Lin Li,Yingying Li,Sijia Zhang,Ting Wang,Xiaohong Hou
In this study, MIL-101(Cr)/cellulose aerogel/melamine sponge composite was fabricated through a simple soaking method. The composite was packed in the syringe barrel and used as the sorbent for microextraction in packed syringe. Coupled to UPLC-MS/MS, the proposed method was employed for the analysis of trace nitroimidazoles in water samples. The parameters affecting the extraction efficiency, including sorbent type, pH value of sample solution, sample solution volume and elution solvent were optimized. Under the optimal conditions, good linearity (r > 0.99 for five analytes), high sensitivity (limit of detection: 8.250–16.33 ng L −1 ), ideal precision (intra-day precision: 1.1%–5.3%, inter-day precision: 1.8%–6.7%) and satisfactory accuracy (recovery: 70.4%–96.7%) were achieved. The proposed method was proved to be efficient, easily operative and environmentally friendly.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Ni Luo,Cheng Chen,Dingming Yang,Wenyuan Hu,Faqin Dong
In the field of photocatalysis , one focus is on high-performance visible light catalysis. For this study, which follows the defect engineering strategy, ultrathin two-dimensional (2D) S defect-rich MoS 2 nanosheets were created in situ by ball-milling MoS 2 nanosheets with ascorbic acid and then used for the removal of Cr(VI) from wastewater. The results show that ascorbic acid increases both the specific surface area of MoS 2 nanosheets and the concentration of S stripping-defects significantly. Of the samples, D-MoS 2 -3 (i.e., S defect-rich ultrathin 2D MoS 2 nanosheets) exhibited the best Cr(VI) adsorption capacity and photocatalytic activity thanks to its large specific surface area and a high concentration of total S defects (18.5%), 311.1% better than for P-MoS 2 (i.e., pristine MoS 2 nanosheets) (4.5%). The concentration of S point-defects in D-MoS 2 -3 is only a little greater than in P-MoS 2 , but the concentration of S stripping-defects is significantly greater. S point-defects at such a high concentration readily act as recombination centers for photogenerated carriers. By contrast, S stripping-defects that lack dangling Mo-S bonds trap photogenerated holes and add to the separation efficiency of photogenerated electron-hole pairs. As a consequence, the photocatalytic performance of D-MoS 2 -3 in removing Cr(VI) is significantly better. Given this finding, the present study offers a new design pathway and a reference for the practical application of defect engineering to ultrathin 2D materials.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Chenxi Li,Yadan Guo,Dandan Tang,Yaoping Guo,Guanghui Wang,Hao Jiang,Jun Li
The density functional theory (DFT) not only is indispensable to calculate the electronic structure and chemical property of photocatalysts, but also provides guidance to the understanding of the mechanisms involved in photocatalysis. Herein, a novel Zn doped AgFeO 2 was successfully constructed for enhancement of Cr(VI) reduction and azophloxine decomposition under visible light irradiation. The DFT calculation was employed to set up a Zn doped AgFeO 2 model to simulate its split Zn 3 d levels shift to lower energy to optimize the band structure. With Zn doped, the AgFeO 2 exhibit enhanced reducing capacity. As expected, compared to unmodified AgFeO 2 , Zn doped AgFeO 2 can reduce and remove more than 90% of Cr(VI). Based on theoretical analysis and systematic experiments, the enhanced photocatalytic of Zn doped AgFeO 2 were arisen from superoxide radical (O 2 − ) generation and photocarrier transfer via oxygen vacancies (OVs) enrichment, and the OVs would provide coordinatively unsaturated sites for Cr(VI) adsorption. We expect this work can provide new insights into the photocatalytic utilization of AgFeO 2 .
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Environmental Science-Nano
·
2019
·Vol. 6
·期 12
·3670-3683
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IF 7.704
Hui Li,Fang Deng,Yang Zheng,Li Hua,Chunhua Qu,Xubiao Luo
Fabrication of Z-scheme heterojunctions and crystal facet engineering are effective strategies for enhancing visible-light photocatalytic redox ability. Visible-light-responsive Z-scheme reduced graphene oxide (rGO)/Bi2S3–BiOBr heterojunctions with a tunable exposed BiOBr (102) facet and high stability were prepared by a one-pot solvothermal strategy. A graphene oxide (GO) solution acts as a rGO precursor and crystal facet controlling agent of BiOBr (102). The optimized 1% rGO/Bi2S3–BiOBr catalyst shows a much higher photocatalytic activity in degrading a single-component 2-nitrophenol (2NP) solution and a reducing single-component Cr(VI) solution than Bi2S3, BiOBr and Bi2S3–BiOBr. In the mixture solution of 2NP and Cr(VI), 2NP degradation and Cr(VI) reduction occur simultaneously, and the Cr(VI) reduction efficiency and 2NP degradation efficiency reached 95% and 67%, respectively. The synergism of rGO/Bi2S3–BiOBr for simultaneous 2NP degradation and Cr(VI) reduction can be attributed to the efficient production of electrons and reactive oxygen species. This work sheds light on the design of facet-dependent Z-scheme photocatalysts to advance photocatalytic redox capability.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
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IF 4.758
Tian Tian,Yu He,Yili Ge,Gongwu Song
Doping is recognized as a powerful way to tailor the defect in the surface and modify the properties of Carbon-based (C-based) materials. Various state-of-the-art techniques have been proposed to prepare boron and nitrogen co-doped C-based materials. Here we first introduced 3-aminophenylboronic acid (APBA) as the single starting material to fabricate boron and nitrogen co-doped carbon dots (N/B-CDs) with high quantum yield (25.9%) through one-pot hydrothermal method without further passivation. We applied the as-prepared N/B-CDs as a probe to detect Cr(VI) based on the inner filter effect (IFE) and dopamine based on the redox reaction, and the linear ranges were 0.25–243 μM for detection of Cr(VI) and 1.4–260 μM for detection of dopamine (DA), respectively. Moreover, this probe was utilized to analysis of dopamine in serum and urine samples, which was presaged more opportunities for application in biological field.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Huirong Zhang,Lin Luo,Zixiong Zhao,Yi Shen,Jinglei Cui,Xiaokai Shi,Xiaoliang Han
The production of high-performance activated carbon (AC) is recognized as an essential strategy for the effective utilization of lignin resources. In this work, the N-doped AC was successfully prepared by blending sodium lignosulfonate (SL) and different ratios of FeCl 3 through one-pot strategy. The AC structure evolution and performance were obtained by a series of characterization and tests. The results showed that, during the activation process, FeCl 3 first complexed with urea and catalyzed the depolymerization of SL, and the rapid pore development was mainly caused by the template, including formed FeCl 2 , Na 2 Fe 3 Cl 8 and Na 6 FeCl 8 . The ratio of FeCl 3 /SL adjusts the AC physicochemical texture. AC-3 processed a super total specific surface area and pore volume, respectively up to 2048 m 2 /g and 1.47 cm 3 /g. Meanwhile, AC-2 showed a higher nitrogen content of 11.4 %. The as-prepared AC shows super desulfurization, denitrification and Cr (Ⅵ) removal ability. AC-2 displayed maximum sulfur capacity and NO conversion, up to 199.1 mg/g and 42.4 %. This enhanced performance is primarily attributed to the pore structure induced by FeCl 3 activation, which provides a foundation for adsorption and catalytic processes, further augmented by the increased active sites due to nitrogen doping. AC-3 achieved an extremely high Cr (VI) adsorption capacity, up to 386.2 mg/g, which was primarily attributed to the redox effect of N-containing and O-containing groups on Cr (VI), in addition, the effect of physical adsorption including pore structure is not neglectable. This study highlights the significant potential of environmentally friendly lignin-based porous carbon materials for removing contaminants in both gas and liquid phases.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Chao Duan,Shasha Che,Guodong Tian,Yiyang Che,Xiaoran Nie,Lei Dai
Abundant hazardous pollutants, in particular heavy metal ions and microbes, in aqueous systems seriously threaten ecological safety and human health. Photocatalysis is deemed an appealing solution yet remains challenging to exploit more efficient, economical, and sustainable photocatalytic materials. In this study, we successfully fabricated a cellulose paper-based composite membrane, namely Zr-TCPP@PDA@FP, for photoreduction of Cr(VI) and photothermal antimicrobial. For the resultant composite membrane, the self-polymerization polydopamine (PDA)-coated cellulose fibers act as sustainable scaffolds to anchor the in-situ synthesized porphyrin-doped UiO-66-NH 2 (Zr-TCPP) nano-photocatalysts. The hypotheses are that: 1) porphyrin doping in Zr-TCPP can both reinforce the visible-light absorption and the transport of photogenerated electrons; 2) mussel-inspired PDA coating on fiber surface not only services as binder to promote the Zr-TCPP loading and dispersion, but also functions as heterojunction interface to accelerate photogenerated electron separation and transfer from Zr-TCPP; As a result, Zr-TCPP@PDA@FP exhibited significant photocatalytic reduction towards Cr(VI), achieving a removal efficiency of 93.9 % within 20 mins and cycling stability. Besides, the hybrid membrane also featured excellent photothermal antibacterial performance (over 99 % for both E. coli and S. aureus ). This work will inspire the development of economic and sustainable cellulose-based functional materials for efficient wastewater remediation.
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