APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Zhongming Wang,Xiaoying Peng,Chuyun Huang,Xun Chen,Wenxin Dai,Xianzhi Fu
A series of polyaniline–titanium dioxide (PANI/TiO 2 ) nanocomposite film sensor were fabricated by an in-situ chemical oxidation polymerization of aniline at TiO 2 (anatase) surface, and were evaluated the CO gas sensitivity under UV irradiation at room temperature. Although adding PANI into TiO 2 seemed to weaken the photo-assisted conductivity of film sensor sample at N 2 atmosphere, it enhanced the photo-assisted gas sensitivity to CO. Based on the chemical characterization results of PANI/TiO 2 by FT-IR, Raman and XPS, it is proposed that the protonated N site in PANI chains (formed by TiO 2 interacting with PANI) would promote the adsorption of CO, resulting in the more electrons from CO to PANI by the typical π–conjugated structures of benzenoid and quinonoid units and then to TiO 2 by the hydrogen bonds (N⋯H⋯O) in the interface of PANI and TiO 2 . Moreover, the presence of H 2 O could enhance this photo-assisted gas sensitivity. Furthermore, the PANI/TiO 2 powder sample also exhibited a higher activity of photocatalytic oxidizing CO than the pure TiO 2 sample, indicating that the enhancement in the photo-assisted sensing response to CO would benefit the photocatalytic oxidation of CO over PANI/TiO 2 . This study not only provides a possible approach to develop a photo-assisted gas-sensitive material by introducing the structure of organic-inorganic hybrided nanocomposite, but also provides a possible method to estimate the photocatalytic activity of a semiconductor material by testing its photo-assisted sensitivity to the reactant gas.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yuang Chen,Yang Zou,Lili Zhao,Zijian Lei,Lixin Song
Point defect has a significant impact on the optical properties of materials. The light absorption behavior can be changed through adjusting the concentration of point defect. Here, nonequilibrium surface oxygen vacancy is firstly introduced into MgTiO 3 material and then eliminated under laser irradiation to realize an optical transformation from high absorption to high reflectivity among a wide range of wavelength. NaBH 4 low-temperature reduction treatment is conducted to control the distribution of oxygen vacancy. MgTiO 3 @MgTiO 3-x core-shell structure is fabricated through the treatment, in which disordered MgTiO 3-x with high-concentration of oxygen vacancy forms a shell covering a highly crystalline MgTiO 3 core. The reflectivity is reduced to 5 % among 400–2500 nm due to the interconduction subband absorption of the metallized disordered MgTiO 3-x shell. Research shows that the core-shell structure is beneficial for enhancing the transformation rate owing to the short diffusion distance. Remarkably, under 100 W cm −2 1064 nm laser irradiation, the nonequilibrium surface oxygen vacancy can be eliminated in a short time and the material will transform to high-reflectivity state in 1000 ms, with the reflectivity restoring to 83 %.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 17
·3811
·
IF 3.057
Zhiquan Huang,Leicheng Li,Zhiping Li,Huan Li,Jiaqi Wu
Herein, novel ternary kaolin/CeO2/g-C3N4composite was prepared by sol-gel method followed by hydrothermal treatment. The self-assembled 3D “sandwich” structure consisting of kaolin, CeO2and g-C3N4nanosheets, was systematically characterized by appropriate techniques to assess its physicochemical properties. In the prerequisite of visible-light irradiation, the removal efficiency of ciprofloxacin (CIP) over the kaolin/CeO2/g-C3N4composite was about 90% within 150 min, 2-folds higher than those of pristine CeO2and g-C3N4. The enhanced photocatalytic activity was attributed to the improved photo-induced charge separation efficiency and the large specific surface area, which was determined by electrochemical measurements and N2physisorption methods, respectively. The synergistic effect between the kaolin and CeO2/g-C3N4heterostructure improved the photocatalytic performance of the final solid. The trapping and electron paramagnetic resonance (EPR) experiments demonstrated that the hole (h+) and superoxide radicals (•O2−) played an important role in the photocatalytic process. The photocatalytic mechanism for CIP degradation was also proposed based on experimental results. The obtained results revealed that the kaolin/CeO2/g-C3N4composite is a promising solid catalyst for environmental remediation.Keywords:kaolin;CeO2;g-C3N4;visible-light irradiation;photocatalytic degradation
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
CHEMOSPHERE
·
2019
·
IF 5.108
Yanming Jia,Tuokun Zhao,Nan Zhao,Hang Wei,Weihua Zhang,Rongliang Qiu
In natural environments, humic substances (HS) play a key role in the control of Cd stability by forming Cd-HS complexes. In this study, we investigated the influence of the photo-irradiation on the Cd levels remaining in Leonardite humic acid (HA) standard solution after chemical precipitation . The kinetic experiment showed that after the irradiation of ultraviolet light, especially UVC, Cd-HA complexes become more stable. The coexisting Cd in the HA solution under light irradiation seemed to enhance the stability of Cd-HA complexes. Both Fourier transform infrared and X-ray photoelectron spectrometric spectra indicated an increase in the thiol amounts in the HA samples treated by light irradiation. Therefore, we developed a fluorescent method to quantify thiol groups in HA with N-(1-pyrenyl) maleimide (NPM). The HA samples were initially spiked with known amounts of glutathione , the reference containing thiol groups, and then was titrated with various amounts of NPM. The measured thiol amounts in the HA treated by UV were found to significantly increase, and the increment was almost equivalent to those of Cd level in HA solution after chemical precipitation. Therefore, it was concluded that the increased thiol groups in HA induced by ultraviolet irradiation resulted in the formation of more stable Cd-HA complexes in solution.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 10
·期 1
·228-235
·
IF 3.049
Bojie Yuan,Minghao Sui,Hongtao Lu,Jingyu Wang,Jie Qin
Understanding the effect of various environmental factors on the transformation of silver nanoparticles (Ag NPs) is crucial to determine their toxicity and fate in the environment. Ag NPs are inevitably exposed to sunlight and will be in contact with chloride (Cl−), a ubiquitous ligand in natural water, once released into the environment. In this study, the combined effect of Cl− and light on various physicochemical properties (optical property, dissolution, morphology, surface charge) of different sizes Ag NPs was studied. The results showed that light irradiation, in the presence of Cl−, led to a great decrease in the concentration of dissolved Ag and a remarkable increase in the zeta potential of Ag NPs, as well as the generation of some tiny Ag NPs and fusion aggregates. AgCl was suggested to rapidly coat onto Ag NPs after exposure to Cl−. And the AgCl layer was obviously destroyed by photoreduction under light irradiation. Meanwhile, the Ag NP size exhibited a great impact on the destruction of the AgCl layer. It was further observed that the AgCl layer gradually re-formed when the light was removed, which suggested that Ag NPs might present different states during the daytime and at night in aquatic environments.
研究领域:
环境科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Renjie Li,Jinyan Li,Linhua Rao,Hongjun Lin,Liguo Shen,Yanchao Xu,Jianrong Chen,Bao-Qiang Liao
Mussel-inspired polydopamine (PDA) modification of membrane is an effective alternative for improving permeation flux and anti-fouling performance. Meanwhile, efficient method for oil-water emulsions separation is still highly desired. However, problems, such as time-consuming process and low utilization ratio of expensive raw material, have always been stumbling block to application of this strategy. In this study, inkjet printing of dopamine (DA) followed by UV light irradiation to modify mussel-inspired polyvinylidene fluoride (PVDF) membrane was proposed. Accordingly, PVDF membrane was inkjet printed by alternately using DA inks and alkaline tris (hydroxymethyl) aminomethane (Tris) ink. The resultant membrane was then subjected to photopolymerization under UV irradiation to form a PDA layer. Successful formation of PDA layer on membrane surface was verified by series of physical and chemical methods . The optimized membrane (DA 80-60 /PVDF) exhibited superior oil/water separation performance with 1.5 times permeate flux higher than that of the pristine PVDF membrane and above 99% oil rejection rate. Meanwhile, the modified membranes showed satisfactory stability in aqueous solution with wide pH range (pH 2.0–7.0). The novel membrane modification method proposed in this study is facile, cost-saving and environment-friendly, serving as a competitive candidate for fabrication of efficient membranes for oil-water emulsion separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2017
·
IF 0
Yanping Zhu,Minwang Laipan,Runliang Zhu,Tianyuan Xu,Jing Liu,Jianxi Zhu,Yunfei Xi,Gangqiang Zhu,Hongping He
A novel and efficient photocatalyst was synthesized by surface hybridizing Zn/Ti-LDH (LDH) with C60 molecules. The structural characteristics of the resulting products (C60/LDH) were studied using a variety of characterization methods, and the photocatalytic activities of C60/LDH were tested using Orange II (OII) as a model contaminant under simulated solar irradiation. The FT-IR spectra showed that the characteristic mode of C60 at 1182 cm −1 split into two peaks at approximately 1240 and 1156 cm −1 ; in addition, the Raman spectra showed the band at 1422 cm −1 for C60 was upshifted to 1431 cm −1 with the increased doping amount of C60. In addition, the XPS spectra revealed that the peaks of O1s, Zn 2p, and Ti 2p were downshifted slightly. These results demonstrated that chemical interaction existed between C60 and LDH on C60/LDH. The UV–vis diffuse reflectance spectra confirmed that the absorbance of C60/LDH in visible-light region enhanced markedly, as compared with that of pristine LDH. The photoluminescence (PL) spectroscopic measurement revealed that the C60/LDH composites exhibited much weaker PL intensity than that of LDH sample, and the transient photocurrent ( I – V ) analysis showed that C60/LDH had higher photocurrent density than pristine LDH. The results of PL spectra and I–V analysis suggested that C60 molecule could effectively transfer the photoelectrons from the conduction band of LDH, leading to a lower recombination rate of the photo-induced electrons and holes. The photocatalytic experiments showed that C60/LDH had much higher photocatalytic activity in the decolorization of OII than that of pristine LDH, and 2%C60/LDH composite exhibited the highest photocatalytic activity. Furthermore, the stability test indicated that the decolorization efficiency of OII by 2%C60/LDH was still quite efficient after being used for 5 cycles.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xiaojun Long,Xiaozhao Wang,Lili Yao,Suya Lin,Jiamin Zhang,Wenjian Weng,Kui Cheng,Huiming Wang,Jun Lin
Graphene (Gr) presents promising applications in regulating the osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs). Light illumination is regarded as a spatiotemporally controllable, easily applicable, and noninvasive mean to modulate material responses. Herein, Gr-transferred silicon (Gr/Si) with a Schottky junction is utilized to evaluate the visible-light-promoted osteogenic differentiation of BMSCs. Under light illumination, light-induced charges, owing to the formation of the Schottky junction at the interface of Gr and Si, accumulated on the surface and then changed the surface potential of Gr/Si. The Schottky junction and surface potential at the interface of Gr and Si was measured by photovoltaic test and scanning Kelvin probe microscopy. Alkaline phosphatase (ALP) activity and quantitative real-time polymerase chain reaction (PCR) measurement showed that such variations of surface improved the osteogenic differentiation of BMSCs, and the activation of the voltage-gated calcium channels through surface potential and accumulation of cytosolic Ca2+ could be the reason. Moreover, X-ray photoelectron spectroscopy characterization showed that surface charge could also affect BMSCs differentiation through the promotion or inhibition of the adsorption of osteogenic growth factors. Such light-promoted osteogenic differentiation of BMSCs on Gr/Si may have huge potential for biomedical materials or devices for bone regeneration application.
研究领域:
生物材料学
·
医学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 5
·3817-3824
·
IF 2.22
Xie Zhipeng,Zhou Yan,Guan Linlin,Muhammad Sajjad,Jiang Yuhan,Zhang Shuyu,Yu Chunxin,Jiao Yangjing,Zhang Shuangshuang,Ren Yang,Zhou Xiaowei,Liu Zhu
Effect of the impurity in Cu 2 O nanowire on the degradation of methyl orange under light irradiation in dark circumstances was investigated. Here, we present the fabrication of Cu 2 O nanowires at different temperatures (110, 130, 150, 170, and 190 °C) by a facile hydrothermal route. Meanwhile, at the synthesis temperature of 110–150 °C, the major impurity in Cu 2 O nanowires was Cu 4 O 3 , and a new Cu impurity was introduced in the Cu 2 O nanowires as the synthesis temperature increased from 170 to 190 °C. Overall, as the synthesis temperature increases from 110 to 190 °C, the total impurity decreases in Cu 2 O nanowires. The fast degradation rate in dark circumstances has been achieved in Cu 2 O nanowires for all synthesis temperatures, which can be attributed to the Cu 2+ in the Cu 4 O 3 impurity of Cu 2 O nanowires. This result shows that the Cu 2 O nanowires obtained at the synthesis temperature of 150 °C have the fastest degradation rate for both under light irradiation and in dark circumstances. It has been found that under light irradiation, the Cu impurity in Cu 2 O nanowires plays a vital role in the degradation of methyl orange. In the current scenario, different impurity contents influence the catalyst activity of Cu 2 O nanowires under the visible light or dark, respectively.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
FERROELECTRICS
·
2017
·
IF 0.551
Xiao-Juan Zhang
Bi2WO6 photocatalysts were fabricated through a hydrothermal process. The phase, microstructure and photocatalytic activity of the obtained Bi2WO6 photocatalysts were investigated. The XRD and FTIR results indicate that the fabricated Bi2WO6 have an orthorhombic phase. The SEM images demonstrate that the fabricated Bi2WO6 has a hierarchical structure. The hierarchical structure may provide Bi2WO6 microsphers with abundant mesopores and thus afford more active sites for photocatalytic reactions, which can improve the photocatalytic activity of Bi2WO6 photocatalyst. The photocatalytic activity of the fabricated Bi2WO6 was evaluated by the degradation of organic dyes under simulated light irradiation. The degradation efficiency of MO is about 92.6% when the system is irradiated by simulated light for 150 min.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
·
2021
·
IF 5.277
Di Sun,Jin Mao,Zhijian Wang,Hui Li,Liangxiao Zhang,Wen Zhang,Qi Zhang,Peiwu Li
Peanut is an important resource of edible oil and digestible protein in daily life, which is rich in the nutriments and antioxidants such as vitamins, minerals and polyphenols. However, peanut is susceptible to the contamination of Aspergillus flavus ( A. flavus ), which can produce highly carcinogenic toxins that brings serious threats to human health and food safety. Exploring green and effective methods to control A. flavus is meaningful. Herein, a green and economical way to control A. flavus on peanuts was demonstrated. It was found that the growth of A. flavus hyphae and germination of its spores could be inhibited in the presence of α-Fe 2 O 3 nanorods under sunlight irradiation according to the agar diffusion method , flat colony counting method and fluorescence-based live/dead test. The diameter of inhibition zone was 22.3 ± 0.2 mm and the inhibition rate of spores germination was about 60 ± 5%, when the concentration of α-Fe 2 O 3 was 10 mg/mL for 7 h sunlight irradiation. Most important, α-Fe 2 O 3 showed the photocatalytic inhibition of A. flavus on peanuts under sunlight irradiation with the inhibition rate of about 90 ± 5%, and the production of aflatoxin B 1 and aflatoxin B 2 were reduced by 90 ± 2% and 70 ± 3%, respectively. By comparing the fat contents, protein contents, acid value, peroxide value and antioxidative compositions of peanuts, it was found that there was no obvious effect on the quality of peanuts after inhibition treatment. The findings provide a green, safe and economical strategy to control A. flavus on peanuts, which may be as a promising way to be used in food and agro-food preservation.
研究领域:
食品科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yiping Feng,Mengyao Shen,Zhijie Xie,Ping Chen,Lin-Zi Zuo,Kun Yao,Wenying Lv,Guoguang Liu
In this study, the photo-transformations of bulk C 3 N 4 (CN) and oxidized C 3 N 4 (OCN) under UV-irradiation were examined. Through NO 3 − release measurements, we found that the photo-transformation rate of OCN is higher than that of CN. Various characterization results revealed the structural and chemical properties changes of CN and OCN after photo-transformation. We proposed that under reactive oxygen species attack, CN and OCN were gradually broken into smaller fragments and finally mineralized into NO 3 -, CO 2 , and H 2 O through the circular reactions of deamination-hydroxylation-decarboxylation. Through the zeta potential measurements and sedimentation experiments, the influence of photo-transformation on the water stabilities of CN and OCN were assessed. The stability of CN in water increased while the water stability of OCN decreased after photo-transformation, implying that the changes to C 3 N 4 -based materials caused by photo-transformation may significantly impact their environmental behaviors. Moreover, the photocatalytic activities of the photo-transformed OCN and CN substantially decreased, indicating that the structural changes might be the main reason for their photocatalytic activity loss. These findings highlight the non-negligible influence of photo-transformation on the fate of C 3 N 4 in aquatic environments, as well as on the photochemical stability during its use.
研究领域:
环境科学
·
材料化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）