SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Luyi Chen,Jinrui Xu,Hengfeng Qian,Boshuang Zhang,Yu Fu,Jianmao Yang,Jianyun Liu
Excessive phosphate concentration in waterbody will lead to eutrophication and deterioration of water quality. Capacitive deionization (CDI) is an environmental-friendly technique for ion removal, and the phosphate ions can be selectively removed and accumulated by designing the CDI electrode materials with specific phosphate bonding capability. Herein, a δ-Bi 2 O 3 -modified porous carbon nanofiber (δ-Bi 2 O 3 @PCNF) was constructed by solvothermal reaction in the presence of polyhydric alcohols. Due to abundant oxygen vacancies and high flexibility, the δ-Bi 2 O 3 @PCNF was used directly as a self-supporting CDI anode for selective phosphate adsorption. Under the optimized conditions, the adsorption capacity of phosphate arrived at 99.6 mg P/g in 50 mg P/L solution, and the adsorption maximum of 127.5 mg P/g was achieved according to Langmuir adsorption model. In the dual-anion solution containing PO 4 3 – and Cl – , the δ-Bi 2 O 3 @PCNF electrode still maintains the high selectivity, with a P separation factor of 22 (C PO 4 3 – /C Cl – = 1:5, molar ratio) in PO 4 3 – /Cl – mixture. By using the δ-Bi 2 O 3 @PCNF-based CDI device, the actual paddy drainage has realized the ultralow phosphate concentration down to 0.03 mg P/L. The related mechanisms involved in phosphate adsorption on δ-Bi 2 O 3 @PCNF were proposed. This work demonstrates the great potential of CDI technology for low-concentration phosphorus recovery, owing to the high selectivity of the δ-Bi 2 O 3 @PCNF electrode material.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
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IF 2.605
Tingting Li,Shenglian Luo
Ag 2 O/Bi 2 O 3 microspheres were successfully synthesized by a facile co-precipitation hydrothermal method in the presence of surfactant polyvinylpyrrolidone (PVP). X-ray diffraction confirmed that Ag 2 O/Bi 2 O 3 was made up of the cubic Ag 2 O phase and the tetragonal Bi 2 O 3 phase. Scanning electron microscopy and transmission electron microscopy showed that the synthesized Ag 2 O/Bi 2 O 3 microspheres were assembled by radially grown nanosheets with the thickness of about 50 nm. In comparison with N-doped TiO 2 , Bi 2 O 3 and Ag 2 O, the Ag 2 O/Bi 2 O 3 composites showed much higher efficiency for photodegradation of Rhodamine B (RhB) under visible light irradiation ( λ ≥420 nm). Among the Ag 2 O/Bi 2 O 3 composites, the sample with 0.3 mol fraction of Ag 2 O exhibited the highest photocatalytic activity. The excellent photocatalytic activity of Ag 2 O/Bi 2 O 3 may be ascribed to the strong visible light absorption resulting from the quantum dot sensitization of Ag 2 O and the efficient separation of photogenerated electron–hole pairs through Ag 2 O/Bi 2 O 3 heterojunction . The possible photocatalytic mechanism was proposed based on band gap structure analysis and the reaction effects by adding the radical scavengers.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 329
·期 3
·1467-1476
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IF 1.371
Yan Meng,Cheng Wencai,Liu Yi,He Xiyang,Wu Biao,Zhang Zhentao,Xie Yi,Lu Xirui
A novel pretreatment method was used to ameliorate the treatment effect of iodine contained radioactive waste. The pretreatment sample (15 w%) held the highest amorphous index (0.50) at 600 °C, and iodine element was in a state of uniform distribution. The density of the sample could increase to 2.95 gcm 3 by using the novel method, which was higher than other similar studies. The leaching result of iodine was as low as 1.53 × 10 6 gm 2 d 1 after 7 days treatment, which indicated that the solidified body has good stability in a long run. Graphic abstract
研究领域:
材料科学
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环境科学
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DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 3
·1594-1605
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IF 3.9
Baikang Zhu,Qinbing Dong,Jianghua Huang,Debin Song,Lihui Chen,Qingguo Chen,Chunyang Zhai,Bohong Wang,Jiří Jaromír Klemeš,Hengcong Tao
To improve the efficiency of photocatalytic oxidative degradation of antibiotic pollutants, it is essential to develop an efficient and stable photocatalyst. In this study, a polymer-assisted facile synthesis strategy is proposed for the polymorph-controlled α-Bi2O3/Bi2O2CO3 heterojunction retained at elevated calcination temperatures. The p–n heterojunction can effectively separate and migrate electron–hole pairs, which improves visible-light-driven photocatalytic degradation from tetracycline (TC). The BO-400@PAN-140 photocatalyst achieves the highest pollutant removal efficiency of 98.21% for photocatalytic tetracycline degradation in 1 h (λ > 420 nm), and the degradation efficiency was maintained above 95% after 5 cycles. The morphology, crystal structure, and chemical state of the composites were analysed by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Ultraviolet-visible diffuse reflection, transient photocurrent response, and electrochemical impedance spectroscopy were adopted to identify the charge transfer and separation efficiency of photogenerated electron–hole pairs. The EPR results verified h+ and ˙OH radicals as the primary active species in the photocatalytic oxidation reactions. This observation was also consistent with the results of radical trapping experiments. In addition, the key intermediate products of the photocatalytic degradation of TC over BO-400@PAN-140 were identified via high-performance liquid chromatography-mass spectrometry, which is compatible with two possible photocatalytic reaction pathways. This work provides instructive guidelines for designing heterojunction photocatalysts via a polymer-assisted semiconductor crystallographic transition pathway for TC degradation into cleaner production.
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
SURFACE REVIEW AND LETTERS
·
2017
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IF 0.491
FEI LI,JINGDE ZHANG,JUNPENG LUAN,YALEI LIU,JIANXUN HAN
The NiO/YSZ anode materials of SOFCs with Bi 2 O 3 as sintering aids were successfully prepared by dry-pressing process. The effects of Bi 2 O 3 content on the sintering properties of NiO/YSZ anode materials were studied, including the effects on the density, open porosity, weight loss, phase composition, microstructure, mechanical strength and electrical conductivity. In particular, the weight loss, relative density and bending strength of the sintered NiO/YSZ ceramics increased with the increase of Bi 2 O 3 content while the open porosity decreased gradually. The density of the NiO–YSZ ceramics with 6 wt.% Bi 2 O 3 sintered at 1250 ∘ C could reach that of the ceramics without Bi 2 O 3 sintered at 1400 ∘ C. For Bi 2 O 3 concentration higher than 6 wt.%, phase transformation of zirconia from monoclinic to cubic structure occurs, causing volume change and microcracks in the anode materials. Therefore, the optimum adding amount of Bi 2 O 3 is 6 wt.%, which can reduce the sintering temperature to 1250 ∘ C. The ceramics with 6 wt.% Bi 2 O 3 have relatively high bending strength and low sintering temperature. This is of great significance for improving the performance of the anode and cutting the cost.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2020
·Vol. 55
·期 11
·2000093
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IF 1.169
Hongjun Chen,Zi Wang,Zeyang Xue,Chunhu Yu,Lizhai Pei,Chuangang Fan
A Bi 2 O 3 /In 2 O 3 heterojunction is successfully fabricated via a facile hydrothermal method using sodium bismuthate and indium nitrate as the source materials. The crystal structure, composition, micromorphology, and optical property of the Bi 2 O 3 /In 2 O 3 heterojunction are analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectrum, scanning electron microscopy, transmission electron microscopy, and solid ultraviolet-visible (UV-vis) diffuse reflectance spectra. The Bi 2 O 3 /In 2 O 3 heterojunction exhibits a remarkable photocatalytic degradation capacity for Rhodamine B, which is better than that of pure Bi 2 O 3 and In 2 O 3 . The photogenerated charges separation and transfer process of the Bi 2 O 3 /In 2 O 3 heterojunction follows a direct Z-scheme mechanism under UV–vis light irradiation. The trapping experiment indicates that oxidative radicals including •OH, h + , and •O 2 − play crucial roles in the photodegradation process. The outstanding photodegradation capacity is ascribed to spatially separated charge carriers, fast-charge transportation characteristic, and special bandgap structure of the Bi 2 O 3 /In 2 O 3 heterojunction. The introduction of H + and OH − ions into the reaction system promotes the formation of •OH and •O 2 − radicals, significantly enhancing the photodegradation rate of RhB. This study presents a new insight into the construction of the Z-scheme Bi 2 O 3 /In 2 O 3 heterojunction photocatalyst with potential application in wastewater treatment.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Lu Chen,Zhengkai Wu,Xueying Cheng,Shuyu Chen,Jiaxin Zhao,Hang Li,Yingna Guo,Qingkun Shang
In this paper, Bi 4 O 5 I 2 /α-Bi 2 O 3 composite photocatalysts were successfully prepared by loading Bi 4 O 5 I 2 nanosheets on the surface of α-Bi 2 O 3 nanorods. The photocatalytic performance was investigated for the degradation of propranolol under visible light. Bi 4 O 5 I 2 /α-Bi 2 O 3 (30) could degrade 95 % of propranolol within 120 min, and the degradation rates of propranolol were 64.3 and 2.68 times that of α-Bi 2 O 3 and Bi 4 O 5 I 2 , respectively. The mineralization degree of propranolol reached 54.7 %, which was also much higher than that of Bi 4 O 5 I 2 and α-Bi 2 O 3 alone. Based on the results of high-resolution mass spectrometry (HRMS), the possible degradation pathways and products of propranolol were proposed, and the environmental toxicity of the degradation products was evaluated. The formation mechanism of Bi 4 O 5 I 2 /α-Bi 2 O 3 Z-type heterojunction was proposed by investigating the band structure and photoelectric properties of the composite photocatalyst. This work provides a successful example for the construction and application of new heterojunction photocatalysts.
研究领域:
环境科学
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材料科学
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药学
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DOI
高影响因子
Journal of the Iranian Chemical Society
·
2024
·Vol. 21
·期 3
·877-885
·
IF 2.2
Liu Gang,Liu Lihui,Zhou Yuyi,Wang Ya,Sui Guoqi,Zhang Peng
In this study, Bi 2 O 3 nanoparticles are prepared via an impregnation method and modified using multi-walled carbon nanotubes (MWCNTs) and PW 12 . XRD reveals that the prepared Bi 2 O 3 corresponded to the monoclinic α -phase. SEM results reveal that the composite consists of a series of nanosheets with flower-like structures. In this study, malachite green (MG) is used as a simulated contaminant to test the degradation capability of the compound under sunlight, and the effect of PW 12 doping on the photocatalytic properties of the sample is investigated. The results show that the degradation kinetic constant of 0.3 PW 12 /MWCNTs/Bi 2 O 3 (0.8125 h −1 ) is about 3 times that of Bi 2 O 3 (0.2767 h −1 ). The ternary complex containing 30% PW 12 has a degradation rate of 95% in 2.5 h. h + and \(^\cdot {\text{O}}_2^-\) were the major active species in the photocatalytic degradation of MG.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ACS Applied Energy Materials
·
2020
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IF 4.473
Zhongkai Xie,Yuyan Xu,Di Li,Suci Meng,Min Chen,Deli Jiang
The highly efficient spatial carrier separation and abundant active sites are significant for CO2 photocatalytic reduction efficiency. Herein, an ultrathin Bi2O3 nanosheet/Bi2WO6 network heterostructure is successfully synthesized via a covalently bonded epitaxial growth strategy. Due to cosharing of the Bi–O tetrahedron between Bi2O3 and Bi2WO6, this heterostructure exhibits a compact interface, which can provide a highway for the charge transfer and then boost their separation. Moreover, the pores generated from the hierarchical structure afford abundant exposed photocatalytic active sites. Thus, the optimal Bi2O3/Bi2WO6 heterostructure (BOBWO-12) shows superior photocatalytic performance for CO2 reduction with an ultrahigh selectivity as well as the removal of RhB. Notably, the photocatalytic CO generation rate over BOBWO-12 reaches up to 17.39 μmol·g–1·h–1, which is 18.0 and 4.2 times higher than that of bulk-Bi2WO6 and Bi2WO6 nanosheets, respectively, and the selectivity is of about 95.4%. Moreover, the Bi2O3/Bi2WO6 heterostructure also exhibits improved long-term stability, resulting from the firm heterointerface. Our studies present a conventient avenue to construct a high-efficiency heterostructure photocatalyst with a firm interface by the covalently bonded epitaxial growth method for CO2 reduction.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiangxing Xu,Xianzhou Ning,Faqin Dong,Xiaoyong Yang,Wei Zhang,Bin Ye,Zhiguo Yang,Guoqiang Zhao,Chuan Zeng,Yushan Yang
In this paper, we present a productive low-temperature fabrication of Cs-hollandite ceramics by adding Bi 2 O 3 as a sintering aid to achieve high cesium retention. The effects of Bi 2 O 3 addition on the phase composition, crystal structure and aqueous stability of the stoichiometric Ba 0.9 Cs 0.3 Cr 2.1 Ti 5.9 O 16 ceramic waste form were investigated. It was found that adding Bi 2 O 3 can effectively reduce the sintering temperature and promote densification of Cs-containing hollandite products. The Cs-hollandite ceramic with 2 wt% Bi 2 O 3 sintered at 1000 °C showed a single phase with > 98 % cesium retention, which was ∼ 200 °C lower and ∼ 11 % retention rate higher than those of reported Cs-bearing hollandite. Moreover, the leached sample remained stable tetragonal structure, the LR Cs was in the order of 10 -3 g·m - 2 ·d -1 after 28 days and the leaching indexes > 8, exhibiting good aqueous stability. This route can be considered as a promising solution to prevent cesium loss for incorporating the cesium waste in ceramic hosts.
研究领域:
材料科学
·
核废料管理
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yan Wang,Shengzhe Zhao,Yi Yang,Raul D. Rodriguez,Anya Lipovka,Yun Lu,Honglan Huang,Jinju Chen
Ag nanoparticle-decorated Bi 2 O 3 -TiO 2 heterogeneous photocatalysts were successfully obtained by combining facile sacrificial templates and photoreduction . The as-synthesized Ag@Bi 2 O 3 -TiO 2 photocatalysts with a narrow band gap of 2.40 eV exhibited considerable photocatalytic activity to degrade rhodamine B (RhB) and tetracycline hydrochloride (TCH), and the removal efficiency reached 100% and 92%, respectively. Ag@Bi 2 O 3 -TiO 2 photocatalysts also exhibited stable recyclability for the degradation of RhB and TCH. Trapping experiments helped determine the major reactive oxidative species for TCH photodegradation . The desirable photodegradation performance is mainly attributed to improved light absorption , enhanced charge separation, and strong redox capacity of Ag@Bi 2 O 3 -TiO 2 nanostructures with S-scheme heterojunction . This work provides a facile avenue to construct heterogeneous tubular nanostructures with intensive photoabsorbance and effective photocatalysis to degrade organic contaminants.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Biao Zhang,Zhihong Luo,Jianming Deng,Mingmei Lin,Liming Quan,Wangxin Li,Shuhang Yu,Dawei Wang,Feng Yan,Changbai Long,Laijun Liu
Calcium bismuth niobate (CaBi 2 Nb 2 O 9 , CBNO) piezoelectric ceramics are promising materials for high-temperature sensors, actuators, and transducers. However, the unique layered structure of CBNO typically results in a low piezoelectric response. Previous studies have generally improved their electrical properties through complex ion substitution or preparation process optimization. Nonetheless, bismuth oxide (Bi 2 O 3 ) volatilization during sintering remains an inevitable issue. This leads to Bi vacancies, oxygen vacancies, and non-stoichiometric composition, negatively affecting both electrical performance and structural stability. In this work, we focus on the influence of excess Bi 2 O 3 on defect compensation and electrical properties. The ceramic with 2 % excess Bi 2 O 3 exhibits ultra-high T C of 929 °C, high d 33 of 14.1 pC/N, 2 P r of 25.5 μC/cm 2 , excellent ρ of 1.02 × 10 5 Ω cm at 600 °C, as well as excellent thermal stability with the d 33 remaining 13.3 pC/N (less than 6.0 %) after annealed at 800 °C for 2 h. This strategy offers a practical solution to improve the stability and performance of CBNO ceramics for high-temperature applications.
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）