ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 3
·3465-3474
·
IF 3.056
Bai Maojuan,Xu Chengcheng,Huang Xuanye,Yin Han,Wan Jun
CuSe as an excellent photocatalytic semiconductor material has wildly used in the field of photocatalysis. In this paper, CuSe-PDA/g-C 3 N 4 was designed and synthesized, and the photocatalytic performance of CuSe was further enhanced by the addition of polydopamine (PDA) and graphite phase carbon nitride (g-C 3 N 4 ). The as-prepared CuSe-PDA/g-C 3 N 4 was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and elemental mapping. The specific surface area and porous characteristics of the material were also studied by N 2 adsorption-desorption isotherm, which the specific surface area were 186.6 m 2 /g and pore size were of 3.1 nm by BET data analysis. The photocatalytic conditions for the degradation of methylene blue (MB) by CuSe-PDA/g-C 3 N 4 were optimized in the experiment. The results showed that the photocatalytic performance of CuSe-PDA/g-C 3 N 4 under visible-light illumination were better than CuSe and PDA owing to the narrow band gap energy and delayed electron-hole recombination. Under the optimized conditions, the removal rate reach to 99% of 50 mg/L MB within 60 min irradiation time. Moreover, the MB removal rate was over 90% through six repeated experiments, which proved that the CuSe-PDA/g-C 3 N 4 composite nanomaterials have good stability and reusability.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MODERN PHYSICS LETTERS B
·
2020
·
IF 1.224
Hetian Xia,Yu Zhao,Weili Li,Ruixuan Song,Yulei Zhang,Weidong Fei
Herein, we report the fabrication of UV-active NaNbO 3 /Al 2 O 3 (30 wt.%) ferroelectric heterojunction photocatalyst with enhanced photoelectrochemical activity to Methylene Blue (MB). Pure NaNbO 3 nanorods (NRs) were synthesized by a facile hydrothermal process and NaNbO 3 /Al 2 O 3 composite was prepared by an ultrasonic vibration method. The heterostructures showed a remarkable increase in photocurrent density and the MB degradation ratio reached 88% in the initial 15 min and eventually reached 98.6% in 75 min. The high photocatalytic efficiency is attributed to the ferroelectric polarization of NaNbO 3 with the forming of heterojunction electric fields assisted by Al 2 O 3 . These properties demonstrate that NaNbO 3 /Al 2 O 3 ferroelectric heterojunction photocatalyst shows promising photoactivity and provides an effective method to improve the photocatalytic properties of other ferroelectrics.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·
IF 2.9
Jiaqi Li,Yidan Zhang,Pingyu Luo,Chun Li,Fanming Zeng,Tiantian Sun,Hanhui Lei,Xiaoteng Liu,Chunbo Liu
Persulphate-based advanced oxidation technology efficiently and cost-effectively removes organic dyes from water but designing stable photocatalytic systems and understanding their reaction mechanisms remain key challenges. Metal–organic frameworks (MOFs) have attracted considerable research attention for degrading organic pollutants owing to their high porosity, tunable structure, and ease of modification. In this study, a series of M-MOF-74 (M = Co, Fe, Ni) photocatalysts are synthesized by a hydrothermal method for methylene blue (MB) degradation. Among them, the Co-MOF-74 photocatalytic synergetic peroxymonosulfate system exhibits high catalytic activity after 30 min of visible light irradiation. MB degradation efficiency reaches 94.8%, and the reaction rate constant is 0.210 min−1, which is approximately 19.44 times higher than the reaction rate constant of the original Co-MOF-74. Compared with Fe-MOF-74 and Ni-MOF-74, Co-MOF-74 exhibits better photocatalytic performance due to the dynamic changes in the valence state of cobalt, which more effectively facilitate the activation of PMS. In addition, this study analyses the possible degradation pathways of MB in water and toxicological evaluations of intermediate products, providing new insights for the effective removal of dyes in water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Yaru Ni,Wei Wang,Wenjuan Huang,Chunhua Lu,Zhongzi Xu
A new idea was employed to simultaneously reduce graphene oxide (GO) and wrap it on the surface of high-reactive anatase TiO 2 for fabricating novel TiO 2 -graphene (GP) hybrid materials. The process was based on the surface negatively charged property of GO. With the introduction of strong chemical interaction between TiO 2 and GP, the GP wrapped TiO 2 gives a strong red-shift of the light absorption edge and a further narrowed bandgap compared to that of GP randomly supported TiO 2 . This structure can also significantly enhance the separation efficiency of photogenerated electrons and holes. Furthermore, in contrast to the normal anatase TiO 2 , as-prepared TiO 2 is dominated with the high-reactive {0 0 1} facet. The superiority of the formed “core–shell” structure is confirmed by photocatalytic degradation of methylene blue (MB) under the xenon lamp and visible light irradiation. New photocatalytic mechanisms are also proposed based on the obtained results. This work may open a new doorway for new significant application of GP to prepare more GP-based high-reactive photocatalysts for environmental protection.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 125
·期 2
·1179-1190
·
IF 1.515
Mao Yong,Wu Mingzai,Li Guang,Dai Peng,Yu Xinxin,Bai Zhiman,Chen Peng
For highly efficient photodegradation of organic pollutants, the enhancement of photocatalytic activity of metal-free photocatalyst graphitic carbon nitride (g-C 3 N 4 ) under visible light irradiation is meaningful, but still challenging due to the fast recombination of photogenerated electron–hole pairs, low quantum efficiency and specific surface area of pristine g-C 3 N 4 . To address these challenges, boron-doped g-C 3 N 4 together with nitrogen-vacancies (Bd-Nv-C 3 N 4 ) was designed and synthesized through a simple acid-assisted calcination of melamine without any further tedious operations. As expected, based on the synergistic effect of foreign elements doping (boron atoms doping) and intrinsic defects (nitrogen vacancies), the as-prepared novel Bd-Nv-C 3 N 4 photocatalyst shows lower band gap, higher surface area and separation efficiency of photogenerated electron–hole pairs, achieving a nearly tenfold increase of the phtocatalytic constant for methylene blue (MB) degradation compared to that of pristine g-C 3 N 4 without nitrogen-vacancies and boron-doping. This study provides a new train of thought and method for the design and preparation of nonmetal photocatalysts with enhanced visible light irradiation photocatalytic performance.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Wang Linjuan,Zan Ling
Compositing nanoparticles photo-catalyst with enormous surface areas metal–organic framework (MOF) will greatly improve photocatalytic performances. Herein, WO 3 nanoparticles are partly embedded into pores of MIL-101 or only supported on the outside of representative MIL-101, which were defined as embedded structure WO 3 @MIL-101@WO 3 and coating structure WO 3 &MIL-101 respectively. Different pH, concentration and loading percentage were researched. XRD, TEM and BET were carried to analyze the composites. Compared with the pristine WO 3 , all WO 3 loaded MOF nanocomposites exhibited remarkable enhancing for the efficiency of photocatalytic degradation methylene blue under visible light. Their activity of the same loading percentage WO 3 in embedded structure and coating structure have increased for 9 and 3 times respectively compared with pure WO 3 . The WO 3 @MIL-101@WO 3 has 3 times higher efficiency than WO 3 &MIL-101, because the shorter electron-transport distance can make a contribution to electron–hole separation. The further mechanism involved has been investigated by radical quantify experiment, XPS and photoluminescence spectroscopy.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jing Wang,Zhan-fang Cao,Hongshan Ren,Chao Yu,Shuai Wang,Liqing Li,Hong Zhong
Some Fenton Fe 3 O 4 catalysts have the problem that the catalytic performance gradually weakens with increasing number of cycles, which brings economic losses and treatment difficulties to industrial wastewater treatment. In this work, the cyclic catalytic performance of Fenton N-rGO/Fe 3 O 4 NPs catalysts for methylene blue (MB) has been enhanced by the reactivation process under the electric field. The effects of chemical reactions, voltage and electrolytic time on the cyclic performance of Fenton catalysts during the reactivation were discussed in detail. The first and fourth complete degradation of MB by fresh catalysts need 10 min and 20 min. After 2 h of reactivation using H 2 O as electrolyte at 1.0 V, the fourth complete degradation of MB only took 10 min. Zeta potential and CV curves showed that recovered catalyst has supplemented with surface electrons during the reactivation process. Characterizations demonstrated that the structure and composition of catalyst would not be influenced during the reactivation process. In short, the reactivation process under low voltage electric field is of great significance to Fenton Fe 3 O 4 catalysts in the field of industrial water treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2021
·Vol. 10
·期 12
·124003
·
IF 2.07
Xinli Wang,Jin Li
Doping is an effective functional modification method for improving the optical, electrical, and magnetic properties of semiconductors. Here, Cd-doped wurtzite ZnO-quantum-dot (ZQ) zero-dimensional nanomaterials were successfully prepared via liquid-phase synthesis. The experimental results showed that Cd doping can effectively shorten the bandgap, where the optical bandgap range of Cd-doping photocatalysts were 3.31–3.36 eV; in particular, the Cd5-ZQ (Cd contents of 0.5 wt%) sample reduced the bandgap from 3.39 to 3.31 eV compared to that of pure ZQ. This is consistent with the experimental results, where the simulation calculation results indicated the bandgap reduced from 3.107 to 2.912 eV after introducing Cd. Photoluminescence spectroscopy results confirmed the Cd-ion dopants efficiently capture excited electrons and further prolongs the charge lifetime. The degradation of a methylene blue solution under simulated solar light irradiation revealed that the photocatalytic properties of Cd-ZQ nanomaterial with suitable dopant concentration (Cd content 0.5 wt%) was significantly better than those of pure ZQ. The underlying mechanism involves a synergistic effect, and a reasonable and convenient strategy for uprate performance is presented.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 2
·1-12
·
IF 2.9
Khatun Most Munera,Islam Ashraful,Yan Chunjie,Nesa Most Jinnatun
A nano-ZnO semiconductor material loaded with mineral attapulgite (ATP) photocatalyst has been investigated. Using ATP as a carrier, a variety of various mixtures of ZnO/ATP composites was synthesized. A scanning electron microscope (SEM), X-ray diffractometry (XRD), and UV-Vis spectrophotometer (UV-Vis) were used to examine the morphology, synergistic effects, and photocatalytic properties of ZnO/ATP nanocomposites. The target pollutant for photocatalytic degradation is methylene blue solution. When ATP is mixed with pure ZnO, the degrading performance of composite nanomaterials in methylene blue solution is considerably enhanced. The degree of methylene blue degradation increases as the amount of ATP in the composite grows, and the degradation rate of ZnO/40% ATP can reach 96% in 45 min under solar light illumination. The amount of ATP in the system is excessive, and the adsorption effect is visible. The optimal composite ratio was determined to be ZnO/30% ATP. After discovering the ideal composite ratio and synergy of ZnO/ATP, g-C 3 N 4 was compounded in the aforesaid system, dramatically increasing the composite’s photocatalytic activity. At 45 min, the degradation rate of methylene blue reaches 97%. The absorption range and intensity of ternary composites increased, and the photogenerated electron-hole recombination rate decreases significantly. The reaction rate constant increases from 0.033 to 0.069 min −1 . SEM revealed rod-like attapulgite particles packed with tiny zinc oxide particles and a moderate layered structure of C 3 N 4 . The XRD pattern indicated that C 3 N 4 ’s crystallinity is poor and ZnO’s peak intensity is excessively high, masking the composite material’s distinctive peaks. The degradation rate of g-C 3 N 4 /ZnO/30% ATP to methylene blue was found to be 91.5% after 5 cycles.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2019
·
IF 1.914
Ya Nan Wang,Jin Li,Qian Wang
Semiconductor photocatalysts have played an important role in degrading water pollution in recent years. In this paper, the effects of graphene on the structure, morphology, optical properties and photocatalytic activity of ZnO and Ce-doped ZnO were studied. The photocatalysts of ZnO, Ce doped ZnO (ZnCeO), ZnO-Graphene (ZG), Ce doped ZnO-Graphene (ZGCeO) were synthesized via one-step hydrothermal method and were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), ultraviolet visible absorption (UV–vis). The results of XRD show the synthesized samples were all ZnO phases without impurity peaks. The prepared ZnO was hexagonal wurtzite crystal structure. A flower-like ZG and an approximate flower-like ZGCeO were characterized via SEM. The UV–vis spectra shows that the absorption edges have red-shifts and the absorption band broaden in all doped or composite samples, meanwhile, the band gap energy decreased from 3.26 eV to 3.06 eV. In addition, compared with pure ZnO, the photocatalytic activity of ZnCeO, ZG and ZGCeO are improved. Among them, ZGCeO shows superior photocatalytic activity: the degradation rate of organic dye MB was 99.17 % in 90 min under simulated solar irradiation .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2013
·
IF 2.224
Jintai Lin,Shuting Pang,Qianming Wang
We used ultrasonic-assisted microwave technique to synthesize V 2 O 5 /MgF 2 :Eu 3+ with characteristic red emissions. Phototocatalytic performances and emission properties were improved compared to the traditional route. Further investigation indicates that 9% V 2 O 5 (molar ratio V/Mg=9%) gave the best result for decomposing methylene blue (91% in 1 h).
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yan-Ping Yu,Meng-Meng Pan,Ming Jiang,Xu Yu,Li Xu
Despite the rapid development of metal-organic framework materials (MOFs), the development of multifunctional MOFs and their application in catalytic and antibacterial fields is still of great significance. In this work, a three-dimensional flower-like Cu-MOF was successfully synthesized by a simple solvothermal method and its pyrolytic derivative Cu-N-C 450 was obtained through pyrolysis of the Cu-MOF. For the first time, the Cu-MOF was preliminarily verified to have laccase-like activity and exhibited excellent antibacterial ability to Escherichia coli ( E. coli ) at a very low concentration of 10 µg/mL without the addition of other substrate. Interestingly, we found the re-assembly of the micro-sized Cu-MOF to generate larger sized flower-like structures which was not common in the self-assembled phenomenon. We found the collision and centrifugation induced external force interaction might be the main factor. In addition, the Cu-MOF was also be used as adsorbent to remove environmental pollutants, such as methylene blue , and the Cu-N-C 450 can rapidly catalyze the degradation of methylene blue with a high efficiency to 96.7%. This work offers a multifunctional MOFs material and promotes the exploration of extending application of the MOFs.
研究领域:
材料科学
·
催化化学
·
微生物学
✓ 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）