Journal of Environmental Sciences
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2020
·
IF 4.302
Yixiao Wu,Chunlong Chen,Shu He,Xuesong Zhao,Shaobin Huang,Gongchang Zeng,Yingying You,Ying Cao,Lishan Niu
In this study, different carbon quantum dots (CQDs)/NaBiO 3 hybrid materials were synthesized as photocatalysts to effectively utilize visible light for the photocatalytic degradation of contaminants effectively. These hybrid materials exhibit an enhanced photocatalytic reduction of hexavalent chromium (Cr(VI)) in the aqueous medium. Zero-dimensional nanoparticles of CQDs were embedded within the two-dimensional NaBiO 3 nanosheets by the hydrothermal process. Compared with that of the pure NaBiO 3 nanosheets, the photocatalytic performance of the hybrid catalysts was significantly high and 6 wt.% CQDs/NaBiO 3 catalyst exhibited better photocatalytic performance. We performed the first-principles density functional theory calculations to study the interfacial properties of pure NaBiO 3 nanosheets and hybrid photocatalysts, and confirmed the CQDs played an important role in the CQDs/NaBiO 3 composites. The experimental results indicated that the enhanced reduction of Cr(VI) was probably due to the high loading of CQDs (electron acceptor) on NaBiO 3, which made NaBiO 3 nanomaterials to respond in visible light and significantly improved their electron-hole separation efficiency.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Yixiao Wu,Xuesong Zhao,Shaobin Huang,Yihao Li,Xiaoqian Zhang,Gongchang Zeng,Lishan Niu,Yu Ling,Yongqing Zhang
Photocatalytic oxidation using solar energy is a promising green technology to degrade antibiotic contaminants. Herein, a 2D g-C 3 N 4 supported nanoflower-like NaBiO 3 with direct Z-scheme heterojunction was synthesized via a facile hydrothermal approach, and the photocatalytic performance of g-C 3 N 4 /NaBiO 3 was remarkable better than that of g-C 3 N 4 and NaBiO 3 for tetracycline degradation under visible light. Photoinduced electrons accumulated on the conduction band of g-C 3 N 4 and holes gathered on the valence band of NaBiO 3 , which was more suitable for generating superoxide and hydroxyl radicals . Meanwhile, the built-in electric field between g-C 3 N 4 and NaBiO 3 was proved by their different work functions based on DFT calculations , which enhanced the charges separation. The formed radicals were determined by ESR, and their role in the degradation of tetracycline was examined by the active species trapping test. Moreover, the sites attacked by free radicals and degradation pathways for tetracycline were inferred by the results of Gaussian 09 program and HPLC-MS. The effects of water matrix and three other organic contaminants was further studied for actual use evaluation. Importantly, the prepared g-C 3 N 4 /NaBiO 3 showed stable photodegradation activity for eight cycles. This work not only provides a promising photocatalyst, but also gets insight into the photocatalytic removal of tetracycline.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
TALANTA
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2022
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IF 6.556
Heng Yan,Xuemei Liu,Fan Zhang,Kaiqiang Ma,Xuepeng Shao,Fengcheng Wu,Jun Han,Wenting Bu,Chuting Yang,Liangbin Li,Sheng Hu
U, Sr, Pb, Nd, and Hf isotope ratios can provide basic and important information of nuclear materials. We established a simple and efficient column chemistry method using nano-NaBiO 3, as both oxidizer and adsorbent, to completely separate Ce from rare earth elements (REEs). This new method exhibited a high decontamination (Ce/Nd < 10 −5 ) ability and was easy to conducted, thereby providing clear advantages compared to traditional liquid–liquid and solid phase micro-extraction techniques. Additionally, a rapid four-column separation procedure, based on Sr, TUR, Ln resins and nano-NaBiO 3 , was developed to isolate U, Sr, Pb, Nd, and Hf in ore samples. The entire procedure could be completed in 4–5 hrs. The robustness of the proposed method was demonstrated by analyzing the 235 U/ 238 U, 87 Sr/ 86 Sr, 206 Pb/ 204 Pb, 207 Pb/ 204 Pb, 208 Pb/ 204 Pb, 142 Nd/ 144 Nd, 143 Nd/ 144 Nd, and 176 Hf/ 177 Hf isotopic ratios of two certified reference materials (CRMs). The analytical results obtained using this method showed good agreement with previously published data. The feasibility of this method was extended to the determination of isotope ratios in uranium ores . The results obtained from the two samples with different regions indicated that they have different isotopic ratios information. These findings indicate the potential for the use of this new method in nuclear forensic science.
研究领域:
化学
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核科学
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地球化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2020
·Vol. 20
·期 5
·3105-3116
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IF 1.134
Gu Xin-Yue,Wang Qiu,Zhang Da-Peng,Geng Xin-Xiang,Zha Zhen-Xing,Li Ying,Yang Jing,Cui Shi-Hai
The Z-scheme Bi2WO6/NaBiO3 nanocomposites were first fabricated by a facile hydrothermal method, and were then characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy dispersive spectrometer, Fourier-transform-infrared
spectroscopy, X-ray photoelectron spectroscopy and N2 adsorption–desorption. The as-prepared Bi2WO6/NaBiO3 nanocomposites exhibit outstanding photocatalytic activity and recyclability. A 98.4% photodegradation of 2,3-dichlorophenol (50 mg·L−1)
was attained in the presence of Bi2WO6/NaBiO3 (1:10) under the visible-light irradiation in 30 min. In particular, the photocatalytic mechanism has been discussed in detail, based on four aspects: (1) oxidative species, (2) photoelectrochemical performance,
(3) conduction band and valence band energy levels and (4) possible transition states and reactions. In conclusion, O−
2 is the main active oxidative species in the Bi2WO6/NaBiO3 nanocomposite. The material has higher photocurrent
and visible light adsorption but lower electron–hole pairs recombination, which contributes to distinguished photocatalytic efficiency. The Z-scheme photocatalytic path was proposed and the possible degradation process and routes have been summarized.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Yang Liu,Yongli Zhang,Jian Zhang,Wei Li,Peng Zhou,Zhicheng Pan,Bo Lai
It has been shown previously that the NaBiO 3 (NBO) could efficiently photocatalytically degrade organic contaminants because of its excellent photocatalytic property. In this study, we proposed a heterogeneous catalytic system of NBO for peroxymonosulfate (PMS) without light irradiation. The results showed that NBO/PMS exhibited excellent performance toward bisphenol AF (BPAF) degradation and mineralization. The effectiveness of the NBO/PMS system was also investigated in different multicomponent systems. The effects of initial pH, NBO dosages, and PMS concentration for BPAF degradation were also investigated. Radical quenching experiments combined with electron spin resonance analysis indicated that singlet oxygen ( 1 O 2 ) was the main reactive oxygen species, and · SO 4 - and · OH – radicals participated in the process. X-ray photoelectron spectroscopy revealed the main catalytic mechanism: lattice oxygen (O vac ) was extruded during the transformation of Bi(V) to Bi(III) to form and activate oxygen (O*), and the generated O* between the [BiO 6 ] regular octahedral layers reacted with PMS on the NBO surface to form 1 O 2 . Based on the results of the Bi element, it is suggested that the activation process proceeded through electron transfer from NBO to PMS. The stability of NBO and applicability of the NBO/PMS system in a natural water environment were explored. This work provides a novel approach to PMS activation and the potential use of NBO for the decontamination of organic pollutants .
研究领域:
环境科学
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化学工程
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
·
IF 21.1
Zhixiong Yang,Xinyue Liu,Xiaobin Hao,Haibo Yin,Yuan Li,Gaoke Zhang
Conventional methods often construct heterojunctions with lattice mismatch and disordered interfaces, suppressing interfacial charge-transfer and weakening photocatalytic activity. Although epitaxial construction could obtain lattice-matched heterojunctions and then boost their carrier separation, constructing such structures under mild conditions remains challenging. Herein, we successfully prepare a lattice matched NaBiO 3 /Bi 2 O 2 CO 3 (NBO/BOC) of 95.8% by a facile bicarbonate (HCO 3 - )-triggered in-situ epitaxial strategy, which removes 98.2% metronidazole, representing an 8.25-fold enhancement over the HCO 3 - -free control, with an apparent reaction rate constant of 0.004 min -1 . Detailed characterizations and experiments results demonstrate that this high removal activity derives from the highly lattice-matched of NBO/BOC heterojunction. That is, the lattice-matched heterointerface in NBO/BOC ensures efficient Z-scheme band coupling and enhances interfacial charge transfer under the coordination of the built-in electric field, boosting photocatalytic degradation activity of the pollutant. These findings demonstrate a sustainable strategy that leverages an inherent wastewater component to self-construct efficient photocatalytic heterojunctions for pollutant degradation.
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