JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Yaping Zhang,Peiyu Cao,Xinhua Zhu,Bozhen Li,Yufeng He,Pengfei Song,Rongmin Wang
BiOBr is a kind of promising photocatalyst because of excellent photoelectric separation efficiency and chemical stability. In order to improving practical application performance, a novel BiOBr ultra-thin nano-roundel (BiOBr-nR) was constructed in water-in-oil (WIO) emulsion microspheres , and prepared by hydrothermal reaction . Its specific surface area was increased by changing microtopography and downsizing. After being characterized by FT-IR, X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET), UV–Vis diffuse reflectance spectra (UV–Vis DRS) and photoluminescence (PL), it indicated the BiOBr-nR, being doped by C and N, is 4–5 times smaller and thinner than that of conventional BiOBr. It was also found that BiOBr-nR has narrower band gap energy (2.78 eV), excellent photocatalytic activity , significant reusability , and stability. The obtained BiOBr-nR photocatalysts were applied to remove organics. It presented excellent photocatalytic activity, the degradation rate of organics got to 99.2%. The mechanism of photodegradation was investigated, which indicated superoxide radicals and holes play a major role in the degradation of organics. Therefore, BiOBr-nR is a kind of environmentally friendly photocatalyst with stable photocatalytic activity, the removal rate still more than 97% after recycling for 10 times. In summary, we found a novel insight for designing and preparation of efficient and recyclable BiOBr photocatalytic materials, which exhibits high photoresponse for purifying the wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Bo Huang,Hsueh-Liang Chu,Moo-Chin Wang,Chao Liu,Weng-Sing Hwang,Xiujian Zhao
The phase formation, growth kinetics and optical properties of 0.5ZnO-0.5CdO thin films have been investigated by X-ray diffraction (XRD) and UV–vis spectrophotometry. The XRD results show that all 0.5ZnO-0.5CdO thin films are composed of CdO as the major phase and ZnO as the secondary phase. Moreover, after annealing of the 0.5ZnO-0.5CdO thin films at 723 K for 45 min and 773 K for 30 min, the minor phase of CdSiO 3 also appeared. The average activation energy of CdO grain growth in 0.5ZnO-0.5CdO thin films by the isothermal method is 10.51±1.17 kJ/mol. The average optical transparency was nearly 80% for the wavelength range from 500 nm to 900 nm. The grain size of CdO on the band gap energy for 0.5ZnO-0.5CdO thin films after annealing has a critical value, namely 15.9 nm. When the grain size of CdO is smaller than 15.9 nm, the band gap energy decreases, showing a redshift effect. Conversely, the band gap energy increases when the grain size of CdO is greater than 15.9 nm, showing a blueshift effect.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2013
·
IF 2.224
Hao Wei,Xinglong Ren,Ziyi Han,Tongtong Li,Yanjie Su,Liangming Wei,Fengsong Cong,Yafei Zhang
z We reported that Zn x Cd 1− x S (ZnCdS) nanorods could be synthesized via a facile, nontoxic one-pot method. Structural and optical properties of ZnCdS nanorods were characterized by relevant equipments. The x value (Zn/(Zn+Cd)) could be altered across the entire range from 0.21 to 0.89 by changing the ratio of cation precursor contents. The band gap energy ( E g ) could be tuned linearly from 2.68 eV to 3.59 eV with respect to x . We also performed first-principles calculations to prove the experimental variation trend of band gap energy. Results showed that the replacement between Zn and Cd influenced the distribution of the electronic structure, and therefore determined the band gap energy.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Linjuan Wang,Ling Zan
Industrial wastewater containing heavy metal ions can cover the full pH range according to the manufacturing process. Alkaline wastewater treatment is still a great challenge because Cr 6+ therein has a more negative reduction potential (Cr 2 O 7 2− + 14H + + 6e − = 2Cr 3+ + 7H 2 O (E Cr 6+ (Cr2O7 2− /Cr 3+ ) = E θ − RT nF ln [ OH ] − ) than in acid solution, in which it can be easily reduced by numerous reagents. In this study, weakly alkaline Cr 6+ solution has been used to simulate weakly alkaline industrial wastewater, and a reagent capable of excellent reduction efficiency therein has been developed. A series of band-gap-energy-adjustable NiS-Zn x Cd 1- x S composites has been synthesized by a one-pot hydrothermal method . A more negative conduction band position for Zn x Cd 1- x S has been achieved by doping and changing the amount of Zn 2+ ions to ensure a superior photoreduction ability. All modified samples show excellent photocatalytic efficiency. For example, the reduction efficiency of 10%NiS–Zn 0.25 Cd 0.75 S sample is threefold higher than that of Zn 0.25 Cd 0.75 S and sixfold higher than that of CdS when deployed at a catalytic level for 30 min. Multiple characterization methods have been applied, and the results show that the improved efficiency can be ascribed to intimate contact between Zn 0.25 Cd 0.75 S and NiS. Photoluminescence (PL) and photocurrent measurements and electrochemical impedance spectroscopy (EIS) further elucidate the catalytic mechanism and imply an enhanced charge-carrier separation efficiency between Zn 0.25 Cd 0.75 S and NiS.
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
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Xia Jiang,Yang Liu,Haijiao Hao,Yan Xu,Jiale Huang,Daohua Sun,Qingbiao Li
Herein, we described a mild and facile method for the synthesis of three-dimensional (3D) hierarchically porous TiO2. This method simultaneously realized the C,N self-dopant, introduced more surface defectives, and decreased in the band-gap energy (Eg) of TiO2. Rape pollen was chosen as the biotemplate to prepare TiO2, and the pore property of the obtained products could be adjusted by changing the amount of Ti precursor and calcination temperature. The as-synthesized pollen-TiO2 not only duplicated the morphology of rape pollen, but also showed enhanced 1-butene selectivity in the reaction of selective hydrogenation of 1,3-butadiene after loading elemental Pd, when comparing with the commercial TiO2. Butenes selectivity of 98% and 1-butene selectivity of 66% were achieved at 50 °C, because of the hierarchically porous structure of pollen-TiO2 and the lower Eg and more surface defects resulting from the C,N dopant.
研究领域:
材料科学
·
催化
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 17
·10391-10396
·
IF 3.108
Xiafang Du,Guan Wu,Jian Cheng,Hui Dang,Kangzhe Ma,Ya-Wen Zhang,Peng-Feng Tan,Su Chen
Metal halide perovskites, such as CsPbX3 (X = Cl, Br, and I), have gained extensive attention due to their increasing demand in optoelectronic applications such as solar cells and lighting-emitting devices. Herein, we report a versatile approach to synthesize high-quality CsPbBr3 perovskite nanocrystals (sized 5–15 nm) by ligand-assisted reprecipitation at room temperature. The monodispersed CsPbBr3 nanocube perovskites displayed relatively high photoluminescence quantum yields of 50–80%. By virtue of the quantum size effects, the bandgap energies were manipulated from blue to green spectral regions (410–530 nm). In addition, through compositional modulations of the anion exchange technique, the bright photoluminescence could be almost tuned over the entire visible spectral region (450–650 nm). Furthermore, the photoluminescence of the CsPbBr3 nanocrystals was characterized by narrow emission line widths of 15–50 nm and radiative lifetimes of 5–15 ns. Finally, by taking advantage of these outstanding merits, the CsPbBr3 perovskites were successfully utilized in the application of highly fluorescent patterning and color-purity light-emitting diodes.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Xiang Li,Yawei Liu,Peng Xu,Xigang Du,Gang Mi,Binglong Mao,Jun Zhang
Titanium dioxide–titanium nitride composite (TiO2–TiN) nanoparticles (NPs) were used as a support to load nickel nano particles for the dehydrogenation of ammonia borane (AB) which is a new method. The composite support was fabricated via a simple ultrasonic mixing route, followed by the in situ loading of Ni NPs using a liquid-phase reduction reaction method where sodium borohydride was adopted as a reducing agent. The synthesized samples were characterized by X-ray diffraction spectra (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Ultra Violet-Visible (UV–vis) analyses. The characterization results show that the Ni NPs uniformly dispersed on the support and existed in both zero and oxidized states. Compared with bare TiO2, Ni loading on TiO2–TiN exhibited a higher catalytic activity toward dehydrogenation of AB both under dark and under sunlight irradiation. Ni/10%TiN–TiO2 showed a hydrogen evolution rate with a turnover frequency (TOF) of 8.01 molH2·min–1·molcat–1 at 25 °C under sunlight. The loading of Ni NPs lowered the band gap energy of TiO2, resulting in the enhanced absorption of sunlight. The addition of TiN that acts as electron scavengers improved the separation efficiency of electron–hole pairs. Titanium dioxide–titanium nitride composites play an important role in improving the catalytic dehydrogenation of AB by nickel-based catalysts.
研究领域:
材料科学
·
催化
·
能源材料
·
纳米技术
·
光化学
✓ 已验证
DOI
高影响因子
TRANSITION METAL CHEMISTRY
·
2024
·Vol. 49
·期 3
·195-213
·
IF 1.6
Gharbi Ahlam Hacine,Hemmami Hadia,Laouini Salah Eddine,Bouafia Abderrhmane,Ben Amor Ilham,Zeghoud Soumeia,Gherbi Mohammed Taher,Ben Amor Asma,Alharthi Fahad,Abdullah Johar Amin Ahmed
A novel CuO–SiO 2 nanoadsorbent, incorporating copper oxide (CuO) and silicon dioxide (SiO 2 ), has been successfully synthesized using three distinct preparation processes: Mode-A (solution and solution), Mode-B (solution and nanoparticles), and Mode-C (nanoparticles and nanoparticles). The investigation focuses on evaluating the efficiency of the CuO–SiO 2 nanoadsorbent, considering its synthesis process, reusability, and sustained performance over time, particularly in the removal of Rose Bengal dye. Characterization results revealed the formation of CuO–SiO 2 nanocomposites structure irregular shapes morphology across all three-preparation processes. The average particle sizes for Mode-A, Mode-B, and Mode-C nanocomposites were determined as 18.1 nm, 15.6 nm, and 14.8 nm, respectively. Furthermore, the band gap energies of the CuO–SiO 2 nanocomposites were measured at 2.2 eV, 1.8 eV, and 3.29 eV for Mode-A, Mode-B, and Mode-C, respectively. Remarkably, the CuO–SiO 2 nanocomposite prepared using Mode-B demonstrated superior photocatalytic activity in degrading the anionic dye Rose Bengal, achieving a degradation coefficient of 84.8%. In comparison, CuO NPs, tested under the same experimental conditions (120 min contact time, pH = 7, temperature of 25 °C, and solar light irradiation), achieved a degradation coefficient of 78.8%. These findings highlight the potential of the CuO–SiO 2 nanoadsorbent, particularly when synthesized via Mode-B, for effective and environmentally friendly dye degradation applications.
研究领域:
纳米技术
·
环境科学
·
材料科学
·
光催化
·
水处理
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Yunfei Yan,Chenghua Zhang,Tao Jia,Haojie Li,Kaiming Shen
Aimed at achieving high efficiency of photocatalytic hydrogen production from ammonia borane (NH3BH3, AB), a reduced graphene oxide (rGO)-modified TiO2 photocatalyst was proposed for hydrogen production. In this study, rGO/TiO2 photocatalysts with different rGO contents were prepared and characterized by XRD, UV–vis DRS, FTIR, Raman, and SEM. The experimental results showed that addition of rGO can reduce the band gap energy of TiO2, and the band gap energy of rGO/TiO2 varies with the content of rGO, and 1% rGO/TiO2 has the lowest band gap energy of 2.96 eV. This indicates that the modification of TiO2 by rGO not only increases the probability of electron transition but also promotes the separation of photoelectron and hole pairs due to the good conductivity of rGO so as to improve the quantum efficiency of photocatalysis. In addition, compared with pure TiO2, rGO/TiO2 shows a certain photocatalytic activity under the condition of light irradiation. Among the rGO/TiO2 photocatalysts with different contents of rGO, 1% rGO/TiO2 shows the best photocatalytic performance of ammonia borane hydrolysis, and the value of turnover frequency is 1088.93 μmol·min–1·g–1. Furthermore, the catalyst 1% rGO/TiO2 shows perfect reusability, and its catalytic activity did not decrease significantly even after five reaction cycles.
研究领域:
材料科学
·
化学工程
·
光催化
·
氢能
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Zhonghui Wang,Jianming Zhao,Qiang Gao,Haihang Luo,Haojun Fan,Jun Xiang,Yi Chen
Urchin-like SnIn 4 S 8 (donated as SIS) photocatalysts were successfully prepared by a rapid and facile microwave assisted synthesis method. The surface morphology, the composition and structure together with the optical performance of SIS prepared at different reaction time were investigated. The results indicated SIS synthesized with 20 min (donated as SIS-20, same below) exhibited higher photocatalytic activity under visible light towards the degradation of RhodamineB than that of SIS-10, SIS-30 as well as SIS synthesized by solvothermal method, larger specific surface areas and lower band gap energy were found to contribute photocatalytic efficiency. Surprisingly, SIS-20 possessed durable stability and recyclability.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2022
·
IF 1.869
Ke-Lai Chen,Yi-Lin Xu,Ke Yin,Yu Cai,Yan-Lin Chen,Yong-Zhen He,Jia-Yu Yu,Wen-Xu Zheng,Chun-Lin Ni
The title inorganic-organic hybrid material containing a mixed anion, [BzIQl]2[Zn(NCS)2Br2] (1) (BzIQl = benzyl isoquinolinium, NCS− = isothiocyanate), crystallizes with a benzyl isoquinolinium cation and half of a bis(bromo)-bis(isothiocyanate)zinc(II) anion in the asymmetric unit. It was characterized by elemental analysis, Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), electrospray ionization mass spectrometry (ESI-MS), and powder and single crystal X-ray diffraction (PXRD and SC-XRD). The organic cation exhibits a Λ-shaped configuration in which two aromatic rings form an inclined dihedral angle of 90.12°. The ZnII ion in the anion is coordinated by two Br ions and two isothiocyanate ions, and two contiguous anions forms a dimer through S···Br interactions. The thermal stability of the hybrid crystal analyzed by thermogravimetric-differential thermal analysis (TG-DTA) reveals that the title crystal was stable up to 170 °C. The PXRD study confirms the phase purity of the crystalline sample. The band gap energy between the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) explains the eventual charge transfer interaction that take place mainly between the anion and [BzIQl]+ cation, and the low value (0.46 ev) indicates the suitability of the crystal for optical application. The first hyperpolarizability predicted using density functional theory (DFT) is more than 720 times that of the reference potassium dihydrogen phosphate crystal (KDP).
研究领域:
无机-有机杂化材料
·
晶体学
·
光学材料
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Guangliang Chen,Xiaolei Si,Jinsong Yu,Huiyu Bai,Xianhui Zhang
This paper reports the synthesis of nanosized Ag/Co 3 O 4 composite catalysts using a silver-mirror reaction and the calibration of their catalytic activities towards methyl blue (MB) dye degradation with peroxymonosulfate (PMS) under visible light. The nanosized Ag/Co 3 O 4 composites were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–vis spectroscopy. The experimental evidence indicated that the hydrothermal synthesis approach lead to the exposure of the {1 1 2} facets of the Co 3 O 4 nanoflakes. Compared to Co 3 O 4 nanoflakes, Co 3 O 4 doped with Ag nanoparticle (average diameters of 10–15 nm) presented lower band gap energy and photoluminescent (PL) intensity. Meanwhile, the Ag/Co 3 O 4 exhibited high stability and excellent dispersion property in dye solution. Experimental data suggested that 3.06 wt% Ag nanoparticle-doped Ag/Co 3 O 4 nanocomposite catalyst possessed the highest catalytic activity towards MB degradation in aqueous solution at the tested concentration level of 15 mg/L, about 2.4 times higher than that of pure Co 3 O 4 . Complete decolorization of the 15 mg/L MB solution can be achieved by 3.06 wt% Ag-doped Ag/Co 3 O 4 nanocomposite within 20 min of visible light irradiation.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
光化学
✓ 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）