Journal of Water Process Engineering
·
2024
·
IF 6.3
Yuan Zhang,Juanjian Ru,Ping Huang,Enhui Wu
NiS 2 is synthesized in a single step at atmospheric pressure using different nickel salts (NiSO 4 ·6H 2 O, NiCl 2 ·6H 2 O, and Ni (CH 3 COO) 2 ·4H 2 O) in choline chloride-ethylene glycol deep eutectic solvent (ChCl-EG DES). The effects of nickel salt types and reactant concentration ratios on the phase and morphology of the products are investigated. Results show that NiS 2 can be obtained when 0.1 M Ni (CH 3 COO) 2 ·4H 2 O and 0.2 M S 0 are used, while impurity S is also found in products when NiCl 2 ·6H 2 O is used. The synthesis mechanism of NiS 2 is proposed through the investigation of the SO 4 2− concentration, pH of the reaction system, and structure of the ChCl-EG DES. DES acts as a reaction solvent and structure-directing agent. The synthesized NiS 2 is used as an adsorbent to remove rhodamine B (RhB) from wastewater. The analysis indicates that the adsorption behavior aligns well with the pseudo-second-order kinetic model and the Freundlich isotherm model. The zeta potential and Fourier-transform infrared spectra of NiS 2 with adsorbed RhB show that the adsorption process is based on electrostatic interaction.
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Catalysts
·
2025
·Vol. 15
·期 2
·175
·
IF 4
Wei Wang,Jiaqi Liu,Guang Shi,Shiqi Wu,Shihan Zhang,Ruixia Yuan
A magnetic shell-structured nano-catalyst was prepared by self-polymerization of dopamine wrapped by ferric oxide as the carrier, which was loaded with palladium nanoparticles (Pd/PDA@Fe3O4). The presence of magnetic Fe3O4made it easy for nanoscale palladium particles to recover and prevent the loss of palladium nanoparticles that is unavoidable in traditional usage and preparation procedures. The catalyst was characterized by X-ray diffraction, fourier transform infrared spectroscopy, scanning electron microscopy, thermal weight loss analysis, Raman spectroscopy, X-ray photo-electron spectroscopy, and magnetic properties analysis. The catalytic performance of the prepared catalyst was investigated taking 4-nitrophenol (10 mg/L) and rhodamine B (15 mg/L) as the target pollutants. The results showed that under the conditions of 35 °C, pH = 7 and a catalyst dosage of 3 mg, the catalytic reduction efficiency of 4-nitrophenol, rhodamine B, and the mixture of them all can reach 99%. The catalytic efficiency of Pd/PDA@Fe3O4remained above 90% after being used 10 times. The shell structure of Fe3O4made it possible and easy to recover and recycle the nanoscale palladium, which was a real problem in the usage of nano-catalysts. At the same time, the problem of separation and recovery of palladium nano-catalyst is solved by magnetism, which provides research ideas for the recycling and utilization of nano-materials.
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CRYSTENGCOMM
·
2025
·
IF 2.6
Huanxia Lin,Wensong Lin,Yeheng Zhang,Ran Gao,Yong He
BiOCl/UiO-66-NH2 photocatalysts were synthesized by a hydrothermal method. BUNH-8 (BiOCl/UiO-66-NH2 composite with 8% UiO-66-NH2) exhibits exceptional photocatalytic performance under visible-light illumination, degrading 92% of rhodamine B (RhB) within 60 minutes, which is 38.16% greater than that of pure BiOCl. The enhanced performance of the BiOCl/UiO-66-NH2 composite photocatalyst can be attributed to the distinct band structure difference between BiOCl and UiO-66-NH2, facilitating effective Z-scheme charge separation and transfer under light irradiation. Superoxide radicals were determined to be the crucial active species in the photocatalytic degradation process via electron paramagnetic resonance (EPR) analysis and a simulated photocatalytic degradation experiment of the dye RhB with scavengers added. Apart from its high efficiency, BUNH-8 demonstrates excellent stability as well. Even after being reused four times, it maintains its excellent photocatalytic performance, suggesting its high potential for application.
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Journal of Water Process Engineering
·
2026
·
IF 6.6
Yanhua Liu,Yunpeng Luo,Geoffrey I.N. Waterhouse,Zhiming Zhang,Liangmin Yu
The rational design of charge-transfer interfaces is essential for high-performance photoelectrocatalytic (PEC) wastewater remediation. Herein, a novel ternary n-n-p heterojunction electrode, titanium dioxide/NH 2 -MIL-125(titanium)/polyaniline (TiO 2 /Ti-MOF/PANI), was successfully fabricated via a two-step hydrothermal and chemical polymerization strategy, followed by electrophoretic deposition. The optimized electrode exhibited a superior Rhodamine B (RhB) degradation efficiency of 96.1% and a total organic carbon mineralization rate of 67.19% within 70 min under visible light with a −0.8 V bias, significantly outperforming the individual photocatalytic and electrocatalytic processes. The superior performance originates from the synergistic integration of the ternary components. Ti-MOF and PANI broaden the visible-light response, promoting the generation of photogenerated electron-hole pairs under visible-light irradiation. Within this heterostructure, PANI functions as a narrow-band-gap sensitizer and p-type hole-transport layer, while n-type Ti-MOF provides a continuous pathway for rapid interfacial charge transfer. Meanwhile, n-type TiO 2 serves as a robust electron-transport backbone and offers stable surface active sites for subsequent redox reactions. The resulting n-n-p heterojunction establishes an internal electric field that, in conjunction with the applied negative bias, accelerates charge-carrier migration and accumulation at the electrode surface, thereby facilitating RhB degradation. Furthermore, PANI acts as an efficient conductive bridge, shortening electron-transport distances and reducing interfacial resistance. Mechanistic insights from radical trapping and electron spin resonance analysis confirm that •O 2 − and •OH are the predominant reactive species driving the oxidative cleavage of the xanthene chromophore. Overall, this work provides valuable design principles for multi-component PEC electrodes, offering insights into efficient environmental remediation.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.4
Yanqing Yang,Yuchen Yang,Zhixian Du,Weike Zhang,Jin Liu
A Z-scheme BiOBr/COF-1 heterojunction was synthesized via a solvothermal method. • The catalyst exhibited enhanced visible-light absorption and charge separation. • A mechanism for the simultaneous removal of RhB and Cr(VI) was revealed. The construction of heterojunctions is commonly employed to boost the separation efficiency of photogenerated charge carriers and the overall photocatalytic performance. In this study, a novel Z -scheme BiOBr/COF-1 heterojunction photocatalyst was synthesized via a facile solvothermal method. Comprehensive characterization confirmed the effective formation of the heterojunction, which exhibited enhanced visible-light absorption and improved separation efficiency of photogenerated charge carriers. Compared with pristine COF-1 and BiOBr, the optimized BiOBr/COF-1 composite (BC-1) demonstrated superior photocatalytic activity for both rhodamine B (RhB) degradation and Cr(VI) reduction. Notably, the reduction efficiency of Cr(VI) was significantly enhanced in a coexisting system of RhB and Cr(VI). In addition, BiOBr/COF-1 exhibited good structural stability over multiple reaction cycles. This work provides an effective strategy for designing Z -scheme photocatalysts to treat complex wastewater containing organic and heavy metal pollutants. Download: Download high-res image (339KB) Download: Download full-size image
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SOLID STATE SCIENCES
·
2025
·
IF 3.3
Huadong Liu,Xiaoyu Sun,Jingliang Cheng,Zhonghao Zhao,Cong Zhang
Bi 2 MoO 6 , a Bi-based semiconductor catalyst, exhibits effective degradation of organic pollutants. Nevertheless, its photocatalytic performance is constrained by several limitations, such as inadequate sunlight absorption, poor charge mobility, and fast charge carrier recombination upon photoexcitation. In this research, we successfully synthesized a Bi 2 MoO 6 composite modified with carbon quantum dots (CQDs), which demonstrates a significant improvement in photocatalytic performance. A series of characterizations and photocatalytic experiments were performed on the synthesized CQDs/Bi 2 MoO 6 samples. Degradation experiments revealed that under simulated sunlight, the CQDs/Bi 2 MoO 6 composite achieved a 95 % degradation rate for Rhodamine B (RhB) within 70 min, with a kinetic constant of 0.03994 min −1 . In comparison, the undoped Bi 2 MoO 6 sample degraded only 46 % of RhB under the same conditions, exhibiting a kinetic constant of 0.00658 min −1 . The primary reactive species, ·O 2 − and h + , were unequivocally identified through combined ESR spectroscopy and radical scavenging experiments as the drivers of pollutant degradation. Furthermore, after four consecutive reaction cycles, the catalyst maintained 90.05 % of its initial activity, confirming its high stability. In summary, this study successfully developed a CQDs-doped Bi 2 MoO 6 composite photocatalyst, offering a promising strategy for advancing photocatalysis research.
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CHEMICAL PHYSICS
·
2026
·
IF 2.8
Xiaohua Zheng,Huilin Han,Ruomeng Zhang,Jingting Yang
Photocatalysis is a green and efficient technology for degrading organic pollutants. However, its development is restricted by the high recombination rate of photogenerated electron-hole pairs. In this study, double-Z-type BiVO 4 /AgBr/Ag 2 MoO 4 ternary photocatalysts were successfully synthesized by a one-step precipitation method at room temperature, and their photocatalytic performance for degrading rhodamine B (RhB) was investigated. The composition and microstructure of the photocatalysts were characterized by X-ray diffraction (XRD), cold field scanning electron microscopy (FE-SEM), X-ray energy dispersive spectroscopy (EDS), specific surface area testing, and X-ray photoelectron spectroscopy (XPS). The results of ultraviolet-visible diffuse reflectance spectroscopy (UV–Vis DRS), photoluminescence (PL), and electrochemical impedance spectroscopy (EIS) indicate that the optical properties of the photocatalysts are good. Under visible light irradiation, the BiVO 4 /AgBr/Ag 2 MoO 4 photocatalyst with Ag 2 MoO 4 mass fraction of 12% achieved a degradation rate > 99% within 12 min, with degradation rates 260.5, 6.1, and 161.7 times that of pure BiVO 4 , AgBr, and Ag 2 MoO 4 , respectively. In addition, holes (h + ) and superoxide radicals (·O 2− ) are the main active species, and hydroxyl radicals (·OH) also have a certain influence during the photocatalysis process, according to the active species capture experiments. This study demonstrates that the ternary photocatalyst has the potential to efficiently degrade organic pollutants under sunlight.
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Materials
·
2023
·Vol. 16
·期 7
·2606
·
IF 3.4
Wei Cui,Jiahui Fang,Yuanyuan Wan,Xueyu Tao,Litong Guo,Qiyan Feng
In this study, an E-fenton oxidation system based on Co-N co-doped carbon nanotubes (Co-N-CNTs) was designed. The Co-N-CNTs system showed fast degradation efficiency and reusability for the degradation of rhodamine B (RhB). The XRD and SEM results showed that the Co-N co-doped carbon nanotubes with diameters ranging from 40 to 400 nm were successfully prepared. The E-Fenton degradation performance of Co-N-CNTs was investigated via CV, LSV and AC impedance spectroscopy. The yield of H2O2could reach 80 mg/L/h within 60 min, and the optimal voltage and preparation temperature for H2O2yield in this system was −0.7 V (vs. SCE) and 800 °C. For the target pollutant of RhB, the fast removal of RhB was obtained via the Co-N-CNTS/E-Fenton system (about 91% RhB degradation occurred during 60 min), and the •OH played a major role in the RhB degradation. When the Fe2+concentrations increased from 0.3 to 0.4 mM, the RhB degradation efficiency decreased from 91% to about 87%. The valence state of Co in the Co-N-C catalyst drove a Co2+/Co3+cycle, which ensured the catalyst had good E-Fenton degradation efficiency. This work provides new insight into the mechanism of an E-Fenton system with carbon-based catalysts for the efficient degradation of RhB.Keywords:carbon nanotubes;E-Fenton;rhodamine B;degradation;mechanism
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Minzhang Li,Wei Wang,Rajendran Ramachandran,Fuming Chen,Zong-Xiang Xu
Exploring highly efficient photocatalysts is critical for integration of photocatalysis and peroxymonosulfate (PMS) activation. Herein, N-CuMe 2 Pc/Siloxene nanocomposites were fabricated by immobilizing the N-CuMe 2 Pc nanorods onto the surface of ultrathin Siloxene nanosheets to activate PMS for efficient photodegradation of (Rhodamine B) RhB. The prepared nanocomposites possess excellent photoabsorption capability and separation efficiency of photogenerated carriers. As expected, the nanocomposites exhibit superior catalytic activity and stability in PMS activation toward RhB photodegradation with highest removal efficiency of 95.3%, which is higher than that of Siloxene and N-CuMe 2 Pc. The active species in photocatalytic process and degradation pathways were determined through radical quenching studies. The reaction mechanism was systematically illustrated based on the intermediates detection and band structures. This study provides an experimental basis for further understanding of the photocatalytic oxidation behavior of metal phthalocyanine modified two-dimensional semiconductor materials, and is helpful to promote the research and application of photocatalytic degradation of refractory organic pollutants.
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International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 23
·15551
·
IF 4.614
Renguo Liu,Xue Li,Jinhui Huang,Haoliang Pang,Qiongfang Wan,Kun Luo,Ya Pang,Lingyu Wang
g-C3N4/Ag3PO4/TiO2nanocomposite materials were loaded onto a polyvinylidene fluoride (PVDF) membrane using a phase inversion method to obtain a photocatalytic flat membrane for dye removal. The morphology, structure, and photocatalytic activity of the g-C3N4/Ag3PO4/TiO2nanoparticles and composite membrane were evaluated. The g-C3N4/Ag3PO4/TiO2/PVDF membrane exhibited superior morphology, hydrophilic properties, and antifouling performance compared with the raw PVDF membrane. Four-stage filtration was performed to evaluate the self-cleaning and antifouling capacity of the g-C3N4/Ag3PO4/TiO2/PVDF membrane. Upon irradiating the composite membrane with visible light for 30 min, its irreversible fouling resistance (Rir) was low (9%), and its flux recovery rate (FRR) was high (71.0%) after five filtration cycles. The removal rate of rhodamine B (RhB) from the composite membrane under visible light irradiation reached 98.1% owing to the high photocatalytic activity of the membrane, which was superior to that of raw PVDF membrane (42.5%). A mechanism of photocatalytic composite membranes for RhB degradation was proposed. Therefore, this study is expected to broaden prospects in the field of membrane filtration technology.Keywords:g-C3N4/Ag3PO4/TiO2nanocomposite;photocatalytic membrane;self-cleaning;membrane fouling;dye
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RSC Advances
·
2022
·Vol. 12
·期 50
·32737-32743
·
IF 4.036
Shuyan Xiao,Liang Sun,Mingqin Kang,Zhongping Dong
A novel label-free aptasensor for the specific detection of clenbuterol was developed through the fluorescence resonance energy transfer (FRET) mechanism by using an aptamer as the target recognition element, rhodamine B (RhoB) as the fluorescence probe and graphene oxide (GO) as the fluorescence quencher. In the absence of clenbuterol, the aptamer was adsorbed on the surface of GO, preventing the interaction between RhoB and GO, and a high fluorescence signal was obtained. In the presence of clenbuterol, the aptamer specially bound to clenbuterol with a high affinity and detached from the surface of GO, while positively charged rhodamine B could be electrostatically adsorbed onto the surface of GO, thus quenching the fluorescence. By comparing the fluorescence intensity before and after the addition of clenbuterol, a simple and fast fluorescence assay for clenbuterol was established with a detection range of 100–700 nM and a detection limit of 9.6 nM. Moreover, the proposed method was successfully applied in the determination of clenbuterol in pork samples with recoveries in the range of 96.75–104.91% and a relative standard deviation of less than 5.67%. Because of its easy operation, fast response, low cost and competitive analytical performance, this method is a promising candidate for the detection of clenbuterol and can be extended to the detection of other targets by changing the corresponding aptamers.
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MOLECULES
·
2022
·Vol. 27
·期 19
·6385
·
IF 4.927
Chengzhi Yu,Libin Zheng,Yongyuan Hong,Jiabin Chen,Feng Gao,Yalei Zhang,Xuefei Zhou,Libin Yang
Advanced oxidation processes (AOPs) demonstrate great micropollutant degradation efficiency. In this study, CuFe2O4was successfully used to activate peracetic acid (PAA) to remove Rhodamine B. Acetyl(per)oxyl radicals were the dominant species in this novel system. The addition of 2,4-hexadiene (2,4-HD) and Methanol (MeOH) significantly inhibited the degradation efficiency of Rhodamine B. The ≡Cu2+/≡Cu+redox cycle dominated PAA activation, thereby producing organic radicals (R-O˙) including CH3C(O)O˙ and CH3C(O)OO˙, which accounted for the degradation of Rhodamine B. Increasing either the concentration of CuFe2O4(0–100 mg/L) or PAA (10–100 mg/L) promoted the removal efficiency of this potent system. In addition, weakly acid to weakly alkali pH conditions (6–8) were suitable for pollutant removal. The addition of Humid acid (HA), HCO3−, and a small amount of Cl−(10–100 mmol·L−1) slightly inhibited the degradation of Rhodamine B. However, degradation was accelerated by the inclusion of high concentrations (200 mmol·L−1) of Cl−. After four iterations of catalyst recycling, the degradation efficiency remained stable and no additional functional group characteristic peaks were observed. Taking into consideration the reaction conditions, interfering substances, system stability, and pollutant-removal efficiency, the CuFe2O4/PAA system demonstrated great potential for the degradation of Rhodamine B.Keywords:peracetic acid (PAA);rhodamine B;copper ferrite (CuFe2O4);organic radicals (R-O˙)
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