Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jian Sun,Haobo Ma,Jiafei Ren,Xia Han,Juan Liu
The practical application of photo-Fenton processes to degrade contaminants is limited by their poor stability under varying pH environment. The requirement of supplementary oxidants and iron additives increase the cost. This reports the construction of Z-scheme heterojunction with Fe coordinatively unsaturated metal sites (Fe CUMSs) based on g-C 3 N 4 as the highly efficient photo-Fenton catalysts. The optimized catalyst presented stable MB degradation efficiency of 115.32 mg g −1 (pH 4.0), 113.44 mg g −1 (pH 7.0), and 106.35 mg g −1 (pH 9.0) in 30 mins without any oxidants and iron-containing additives. The self-feeding photo-Fenton mechanism was studied in details, suggesting that Fe CUMSs improved the H 2 O 2 generation rate of g-C 3 N 4 to 6.23 μmol L −1 h −1 . A completely reversible Fe 2+ /Fe 3+ conversion process lead to persistent generation of hydroxyl radical to degrade MB without iron precipitation generation. This work presents a new strategy constructing self-feeding photo-Fenton catalytical system to remove contaminants for environmental remediation and sustainability.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Lixiang Zhang,Luping Feng,Jiatian Jiang,Pan Li,Xi Chen,Sheng Zhang,Yuan Gao,Ruoxi Hong,Guofu Chen,Guojiang Mao,Hua Wang
A highly sensitive and visible-light-driven photoelectrochemical (PEC) sensor has been constructed for the quantitative assay of organophosphorus pesticides like chlorpyrifos (Chlo) using hollow Co 9 S 8 @CdS heterostructures . The Co 9 S 8 @CdS heterostructures were created by growing CdS onto Co 9 S 8 surface via one-step oil-bath route, of which Co 9 S 8 was fabricated with hollow tubular structures through the Co(CO 3 ) 0.35 Cl 0.2 (OH) 1.1 -templated solvothermal method . It was discovered that the so-obtained Co 9 S 8 @CdS with direct Z-scheme heterojunctions could exhibit larger photocurrents than the Co 9 S 8 or CdS because of the greatly enhanced separation efficiency of photo-generated carriers. What’s more, the photocurrent signal of Co 9 S 8 @CdS-based PEC sensor could be selectively inhibited with the addition of Chlo through the specific chelation between the N and S atoms of Chlo with C N and P S groups and Co sites of Co 9 S 8 @CdS so as to suppress the carriers transferring. The developed PEC sensor could exhibit a linear response for Chlo ranging from 0.050 to 1000 ppb, with the detection limit value down to 0.015 ppb, which was far below than those of currently reported PEC sensors. Besides, the proposed routes may provide guidelines for designing various direct Z-scheme heterojunction-based PEC analysis platforms for determining environmental pollutants like Chlo.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Solar RRL
·
2020
·Vol. 5
·期 2
·2000453
·
IF 7.527
Hong Miao,Jun Yang,Yuqiang Sheng,Wenlu Li,Yongfa Zhu
To exploit the noble-metal-free, highly efficient and broad-spectrum responsive photocatalyst of perylenetetracarboxylic diimide (PDI), a self-assembled PDI nanowire is loaded on the surface of a graphite-like carbon nitride (g-C 3 N 4 ) nanosheet and forms an all-organic supramolecular 1D/2D heterogeneous g-C 3 N 4 /PDI with broad-spectrum responsiveness (254–700 nm), which can improve the absorption efficiency of solar energy. In the g-C 3 N 4 /PDI system, the π–π conjugated bond in the g-C 3 N 4 /PDI can accelerate the photoinduced charge carrier transfer. On the other hand, the interlaced band structure between the g-C 3 N 4 and PDI and the Z-scheme pathway of the carriers leads to the spatial separation of redox reaction sites. Therefore, the g-C 3 N 4 /PDI photocatalyst reaches strong redox ability in the photocatalytic process. In detail, the photocatalytic phenol degradation of g-C 3 N 4 /PDI (0.837 h −1 ) is enhanced 2.67 and 9.19 times higher as the pure PDI and g-C 3 N 4 , respectively, under the full spectra. Meanwhile, the H 2 evolution activity of the g-C 3 N 4 /PDI (1649.93 μmol g −1 h −1 ) is 2.03 times higher than g-C 3 N 4 nanosheet (814.03 μmol g −1 h −1 ).
研究领域:
材料科学
·
光催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xuanwen Liu,Juanjuan Xu,Zhiyuan Ni,Renchao Wang,Junhua You,Rui Guo
The debated photocatalytic mechanism in the photocatalyst composite Ag 3 PO 4 /WO 3 is explored by analyzing the electron flow direction between Ag 3 PO 4 and WO 3 . Cubic phase WO 3 nanosheets with a thickness of 10–20 nm are prepared using the sintering method at 200 °C and decorated by cubic Ag 3 PO 4 particles using a practical deposition-precipitation method. Pure WO 3 shows a strong adsorption activity for rhodamine B (RhB) and methylene blue (MB), but no adsorption activity for methyl orange (MO) and it shows no photocatalytic activity on these three dye molecules. Pure Ag 3 PO 4 has no adsorption activity on RhB but shows a strong photocatalytic activity on RhB under visible light irradiation. As-prepared AW-x composites with different weight ratios show no adsorption activity but a high photocatalytic activity. However, after heat-treatment at 200 °C for 24 h, the composite catalysts show both a strong adsorption and photocatalytic activities on RhB. The results provide an indirect evidence that the electron flow direction is from WO 3 to Ag 3 PO 4 , which thus supports the Z-scheme photocatalytic mechanism.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Lixia Yang,Feishi Xu,Guangwen Chen
Ultrasonic oscillation can be leveraged to efficiently intensify the gas-liquid mass transfer in microreactors. This work aims at revealing the gas-liquid mass transfer enhancement mechanism in zigzag ultrasonic microreactors (zigzag USMRs). A rigorous and quantitative comparison of the O 2 mass transfer performance and mixing efficiency inside the liquid slug during the Taylor bubbles flowing within the straight and zigzag USMRs was made. The synergetic effect of zigzag geometry and ultrasonic oscillation can enhance the mass transfer by an enhancement factor from 1.88 to 3.80. However, this synergetic effect would not have a significant impact on the mixing efficiency inside the liquid slug with an enhancement factor from 0.91 to 1.03. The synergetic enhancement effect of gas-liquid mass transfer performances could not be regarded as simply adding up the separate contribution of zigzag geometry and ultrasonic oscillation. Semi-empirical equations were established to predict the overall mass transfer coefficient in zigzag USMRs.
研究领域:
化学工程
·
生物技术
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2017
·
IF 0
Jun Liu,Qingyong Tian,Zhaohui Wu,Weijing Yao,Xiangheng Xiao,Wei Wu
Trinary g-C 3 N 4 /Ag/Ag 3 PO 4 heterostructures with different Ag content were designed and synthesized by in situ deposition and reduction routes. The photocatalytic performances of these heterostructures were investigated under visible light (λ > 450 nm) and simulated sunlight. Moreover, the influence of Ag content and ratio of each component on the photocatalytic performance of g-C 3 N 4 /Ag/Ag 3 PO 4 was also studied. As a result, the photocatalytic activities of all these g-C 3 N 4 /Ag/Ag 3 PO 4 samples were higher than commercial P25 (TiO 2 ). Moreover, sample S1 (the ratio of g-C 3 N 4 , Ag 3 PO 4 and Ag is 1: 2.52: 0.12) showed the better photocatalytic activities than other g-C 3 N 4 /Ag/Ag 3 PO 4 samples (S2 and S3) and g-C 3 N 4 /Ag 3 PO 4 (1: 3) under the same light irradiation. It indicated that small amount of Ag nanoparticles could improve the photocatalytic performances by compared with g-C 3 N 4 /Ag 3 PO 4 sample. And S1 showed a stable photodegradation after 6 times of cycle experiments under simulated sunlight. The stable and significant superior photocatalytic performance of g-C 3 N 4 /Ag/Ag 3 PO 4 could be attributed to the fast charge separation among g-C 3 N 4 , Ag and Ag 3 PO 4 during the Z -scheme charge transfer and recombination process.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
Russian Journal of Physical Chemistry A
·
2025
·Vol. 99
·期 3
·634-645
·
IF 0.8
Lili Li,Jiang Ke,Xi Wen,Li Jia Xin,Shu Jing
The synthesized SrTiO 3 /PANI composite materials through a simple in situ oxidation process. A series of analytical techniques, including XRD, FT-IR, SEM, TEM, XPS and so on, were employed to investigate the morphological and structural characteristics of the composite materials and their elemental composition. The results of the UV irradiation of RhB demonstrated that pure SrTiO 3 exhibited a degradation rate of 73.35% within 60 min. The SrTiO 3 /PANI (20%) composite exhibited a 98.18% degradation rate in 60 min, indicating the optimal conditions for photocatalytic degradation of RhB. The free radical scavenging experiment demonstrated that superoxide anion ( \( \cdot {\kern 1pt} {\text{O}}_{2}^{ - }\) ) is the dominant active species, the photocatalytic mechanism of Type-Z heterojunction was described in detail according to the band gap and free radical capture experiments of SrTiO 3 and PANI.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 50
·期 4
·1718-1727
·
IF 2.305
Shi Lei,Liang Lin,Wang Fangxiao,Liu Mengshuai,Sun Jianmin
A facile direct growth method was developed for the fabrication of Ag 2 CO 3 nanoparticles on the surface of g-C 3 N 4 at room temperature. The as-prepared g-C 3 N 4 /Ag 2 CO 3 composites were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy with energy dispersion X-ray spectroscopy, UV–vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The photocatalytic activities were evaluated by degrading Rhodamine B dye. The results indicated that Ag 2 CO 3 nanoparticles with the size of 5–10 nm were finely distributed on the surface of g-C 3 N 4 sheet, leading to the enhancement of the photocatalytic activity. And when the mass ratio of g-C 3 N 4 to Ag 2 CO 3 was 1:4, the as-prepared composites exhibited the optimum photocatalytic activity, which was approximately 8 and 3 times higher than pure g-C 3 N 4 and Ag 2 CO 3 , respectively. The enhanced photocatalytic performance could be attributed to the synergetic effects between g-C 3 N 4 and Ag 2 CO 3 , including the smaller particle size of Ag 2 CO 3 and high charge separation efficiency of the photogenerated electron–hole pair. More attractively, the stability of Ag 2 CO 3 was improved due to its highly dispersion on g-C 3 N 4 sheet. In addition, based on the experimental results, the Z-scheme mechanism for the photodegradation over g-C 3 N 4 /Ag 2 CO 3 composites was proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 36
·8490-8495
·
IF 5.066
Liang Bai,Shi Qiao,Yu Fang,Jianguo Tian,J. Mcleod,Yinglin Song,Hui Huang,Yang Liu,Zhenhui Kang
We quantitatively investigate the nonlinear optical (NLO) property of carbon nanodots (CNDs, less than 10 nm) by the Z-scan technique using a tunable 532 nm nanosecond laser system. These CNDs were fabricated by an electrochemical etching method from graphite rods. Our results suggested that the third-order nonlinear susceptibility χ(3) of CNDs is strongly dependent on the diameter of the CNDs apparently; the nonlinear refractive index γ decreased as the size of CNDs decreased, while the nonlinear absorption coefficient β showed an opposite tendency to γ. We further demonstrated that the carboxyl group on the CND surface plays a key role and has significant impact on the third-order nonlinear susceptibility χ(3).
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 49
·495405
·
IF 3.551
Xiaozhen Ren,Xunshuang Zhang,Ruichen Guo,Shulan Zhang,Lezhi Wang,Xipeng Pu
Bi metal attached BiOBr with oxygen defect (BiOBr(3)-Bi(x%, x = 10, 20, 30)) nanosheets was prepared via the hydrothermal process in this study. The different characterization techniques of x-ray diffraction, x-ray photoelectron spectrometer, electron spin resonance (ESR), field emission scanning electron microscope, and high resolution transmission electron microscope were used to distinguish the composition, crystal structure, and morphology of the samples. Under visible light irradiation, the BiOBr(3)-Bi(x%, x = 10, 20, 30) samples exhibited improved photocatalytic activity for the degradation of colored dyes (RhB) and colorless tetracycline hydrochloride. Such an improvement was ascribed to the widened visible light absorption and enhanced separation of the photogenerated electron–hole pairs because of the synergistic effect of oxygen vacancies and Bi metal with plasmon resonance effects. A possible photocatalytic mechanism of the quasi Z-scheme process was proposed on the basis of ESR measurements and radical-trapping experiments.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Ying Hu,Rongkang Yan,Huiyan Pan,Ruyi Cai,Zhili Zeng,Jialun Jiang,Meng Wang,Meng Shan,Shasha Liu,Hai Tang
The integration of adsorption and photocatalysis in heterojunction composites offers a promising strategy for efficient azo dye degradation. Here, a novel α-Fe2O3/perylene-3,4,9,10-tetracarboxylic diimide (PDINH) Z-scheme heterojunction was synthesized via a facile solvent method, showcasing synergistic adsorption–photocatalysis for wastewater treatment. Zeta potential analysis (α-Fe2O3: +14.7 mV; PDINH: −24.3 mV at pH 5.0) and density functional theory (DFT) calculations (binding energy: −3.10 eV) revealed strong electrostatic interactions between α-Fe2O3 and PDINH, enabling uniform nanoparticle dispersion and forming a heterostructure with enhanced specific surface area. Electrochemical measurements confirmed that the Z-scheme heterojunction significantly accelerated charge carrier migration and suppressed electron–hole recombination, facilitated by an internal electric field from well-matched band alignment. Under visible light, the α-Fe2O3-15/PDINH composite achieved 93.4% removal of methyl orange (MO), outperforming PDINH alone (63.1%) due to its positive surface charge (+8.7 mV at pH 5.0) that enhanced selective adsorption of anionic dyes. Quenching experiments identified h+, ·O2−, and ·OH as the primary reactive species, with the Z-scheme pathway retaining strong redox capabilities for efficient degradation. Notably, the composite exhibited an operational cost of $2.41 per ton, significantly lower than other reported processes, and maintained high efficiency (81.8% MO removal) over multiple cycles. This work demonstrates that the α-Fe2O3/PDINH composite integrates adsorption and photocatalysis synergistically, providing a low-cost, scalable solution for azo dye wastewater treatment with potential for industrial application.
研究领域:
环境科学
·
材料化学
·
光催化
·
水处理技术
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Juanru Huang,Zhenhua Hu,Yanrui Xue,Yao Wang,Yu Wang,Fanyong Yan
In heterogeneous catalysis, optimizing the separation of photogenerated carriers by tuning synthesis of catalysis, is always a crucial strategy to strengthen the photocatalytic performance. Here, O vs -BiOCl@Carbon dots/Bi 2 WO 6 (OB/CB) of a Z-scheme heterojunction, was fabricated by coupling O vs -BiOCl (OB) nanosheets with carbon dots/Bi 2 WO 6 (CB) compound in one-pot hydrothermal treatment. The optimized heterojunction of OB/CB with the weight ratio of 1:2 (OB/CB-1:2) achieve the degradation efficiency of 91.66 % of Tetracycline (TCH) under the visible light, which was much higher than those of pure OB of 34.46 % and CB of 81.92 %. Meanwhile, the Z-Scheme OB/CB-1:2 also display the extremely adaptable and effective to eliminate Rhodamine B (Rh. B) of 99.43 %, Oxytetracycline (OTC) of 83.04 % and Ciprofloxacin (CIP) of 87.66 %, respectively. The photocatalytic activities are probably attributed to the recombination of photogenerated carriers, occurring at the accumulated electrons (e - ) from the conduction band (CB) of Bi 2 WO 6 (BWO) transfer to the holes (h + ) from the valence band (VB) of O vs -BiOCl in the heterojunction driven by CDs, and thus the more oxidizing h + of BWO with the more reducing e - can be retained synchronously. The extra oxygen vacancies maximize the reduction ability of e - and further support the higher photocatalytic activity of OB/CB-1:2 than other counterparts. In addition, the corresponding photoelectrochemical measurements and scavenging experiments cooperatively demonstrated that the formation of OB/CB-1:2 definitely facilitated the separation of photogenerated carriers, and further revealed that species of •O 2 ‾ and h + mainly contributed to the photodegradation. This work illustrated that the potential utilization of CDs can effectively modulate Z-scheme heterojunction to achieve water remediation etc.
研究领域:
环境科学
·
材料化学
·
光催化
·
纳米材料
·
水体修复
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）