RSC Advances
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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.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 27
·21396-21408
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IF 2.779
Wang Jiaxuan,Wu Daoxin,Wu Jialun,Duan Mengtian,Tong Haixia
A novel Bi 2 O 3 /Cs 3 PW 12 O 40 (Bi 2 O 3 /CsPW) composite was prepared by depositing Bi 2 O 3 on the surface of spherical Cs 3 PW 12 O 40 . The synthesized photocatalyst was characterized using XRD, XPS, FT-IR, BET, SEM, TEM, and UV–Vis. The results revealed that the composite was a typical Keggin-type photocatalyst. Compared with pure Bi 2 O 3 and CsPW, the composite exhibited high photocatalytic degradation activity for rhodamine B (RhB). The 10% Bi 2 O 3 /CsPW nanocomposite could decompose 92.7% of RhB under visible-light irradiation for 240 min. The improved photocatalytic degradation efficiency is mainly due to the enhanced absorption of visible-light and effective separation of photo-induced carriers caused by heterojunction formation. The active species capture tests confirmed that RhB photodegradation using Bi 2 O 3 /CsPW composite was mainly controlled by h + and·O 2− oxidation reactions. Furthermore, Bi 2 O 3 /CsPW composite displayed good stability under cyclic experiments.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Bing Xiao,Minghao Xu,Bin Lu,Yun Wang,Hui Liu,Rufen Chen
Economical elimination of organic pollutants from waste water has be paid more attention owing to its environmental and ecological significance. In this study, an easily achievable process to in-situ fabricate copper and co-modified Z-scheme BiOCl/Bi 2 O 3 heterojunction was proposed. The study on the formation mechanism indicated that the introduction of copper ions is favorable for the formation of Bi-based catalyst with flaky morphology while the addition C-dots makes the nanosheets loosely be packed and intercrossed each other. The composite exhibited a high degradation efficiency for Bisphenol A (BPA) and 91% of BPA was removal within 35 min under xenon lamp irradiation. The excellent photocatalytic performance was attributed to the synergistic effect of the in-situ formation Z-scheme BiOCl/β-Bi 2 O 3 heterojunction, multiple charge transfer channels including Cu 2+ /Cu + and C-dots, and efficient charge separation. The electron paramagnetic resonance (EPR) analysis and quenching tests revealed that O 2 •− play a main role in degradation of BPA. Based on the experimental results, the photo-catalytic mechanism is proposed and the degradation path of BPA is revealed.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhanjun Zhang,Liyuan Wen,Siying Liao,Xingye Zeng,Rujin Zhou,Ying Zeng
The deep removal of sulfide from fuel oil is the key to the production of clean energy using Bi 2 O 3 -MoO 3 binary semiconductor materials that effectively improve the activity of the catalytic reaction. In this study, the controllable synthesis of Bi 2 O 3 -MoO 3 binary metal composite oxides with different crystalline phases (α, β, and γ) was realized via microwave hydrothermal method at the pH of 1 through the variation of the theoretical Bi/Mo molar ratio. The catalytic oxidative desulfurization (ODS) experiments revealed that γ-Bi 2 MoO 6 catalyst had higher catalytic activity than α-Bi 2 Mo 3 O 12 and β-Bi 2 Mo 2 O 9 . At 65℃, γ-Bi 2 MoO 6 catalyst exhibited the outstanding deep catalytic oxidation ability for dibenzothiophene (DBT), benzo thiophene (BT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT). After 7 times of recycling, the removal rate of DBT still reached 99.11%. According to the kinetic fitting data, the catalytic oxidative desulfurization of DBT in model oil by γ-Bi 2 MoO 6 conformed to the first-order kinetic equation with the reaction activation energy of 51.05 kJ/mol. Moreover, the possible mechanisms of ODS were explored. The ultrafast oxidation was concluded to be due to peroxo species produced through the action of composite metal oxides.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
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2021
·
IF 3.531
Xiyang He,Wencai Cheng,Meng Yan,Wanrong Song,Yi Liu,Zhentao Zhang,Tao Ma,Weizhen Liu,Xirui Lu
As to spent fuel reprocessing in the nuclear industry, disposal of iodine-containing silver silica gel (AgIs) is a challenge. Method for immobilizing AgIs with the B-Bi-Zn glass powder at low temperatures has been applied to cope with this dilemma. In ingredient analysis, only diffraction peak of AgI can be detected in the sintered samples. In addition, the element analysis confirmed the existence and distribution of AgI in the solidified matrix. According to leaching experiment, low leaching rate (10 −6 ) demonstrated that the sintered body possessed good chemical stability in liquid circumstance. Based on the research statistics, quality loss ratio of sample (98.58 g) sintered at 600 °C under the gas pressure sintering was merely 1.61%. Meanwhile, the quality retention proportions of AgI and raw powder from thermogravimetric analysis were certified as 98.09% and 96.19% respectively at 600 °C. Therefore, this study comprehensively proved the glass powder curing prospective for AgIs disposal.
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Environmental Science-Nano
·
2021
·Vol. 8
·期 3
·773-783
·
IF 8.131
Haixia Wang,Dong Liang,Yan Xu,Xiang Liang,Xiaoqing Qiu,Zhang Lin
The development of an effective and stable photochemical sensor is urgently needed to solve the growing environmental pollution problem caused by immoderate usage of the organic phosphorus pesticide, chlorpyrifos. Under the circumstances, 2D/2D Z-scheme β-Bi2O3/g-C3N4 heterojunctions have been attempted to fabricate a photoelectrochemical sensor, which can detect chlorpyrifos selectively and sensitively. The 2D/2D intimate contact interfaces could facilitate the separation and migration of electron–hole pairs. Consequently, β-Bi2O3/g-C3N4 composites possess higher photocurrent response than single β-Bi2O3 and g-C3N4. After incubation with chlorpyrifos, in situ formed Bi–chlorpyrifos complex blocks the transformation of photogenerated charges, and thus contributes to a dramatic decline in photocurrent signal intensity and selective determination of chlorpyrifos. The novel photoelectrochemical sensor with strong stability presents a perfect linear relationship between photocurrent intensity and logarithm of chlorpyrifos concentration ranging from 0.01 to 80 ng mL−1, and displays excellent properties over a wide linear range with an ideal detection limit of 0.03 ng mL−1 (S/N = 3). To some extent, the Z-scheme β-Bi2O3/g-C3N4 sensor is promising for the detection of chlorpyrifos pesticides in practical environmental pollution treatment applications.
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CHEMICAL PHYSICS
·
2021
·
IF 2.348
Wenna Hu,Fan Wu,Wei Liu
In this paper, nitrobenzene was found to be efficiently degraded by the as-prepared Z-scheme Bi 2 O 3 /Bi 2 WO 6 photocatalyst under visible light . The Bi 2 WO 6 and the composites were fabricated individually by solid phase synthesis and water-assisted grinding method. The crystal structure, morphologies, interface, optical property and Brunauer-Emmett-Teller (BET) surface area of samples were examined by different characterization techniques. The tests on photodegradation of nitrobenzene stated clearly the as-prepared composite exhibited evidently enhanced photocatalytic performace compared with uniphase material. Additionally, the optimal Bi 2 O 3 content in the coupled photocatalysts was 2%. The supreme rate constant of nitrobenzene degradation was almost 3.1 and 2.7 times that of single Bi 2 O 3 and Bi 2 WO 6 , respectively. The obviously increased photocatalytic performance of the composite was due to the highly effective separation of photoexcited electron-hole pairs over the Z-scheme structure formed between Bi 2 O 3 and Bi 2 WO 6 . The investigation provides great potential applications in treatment of the toxic and refractory wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jia-qi Li,Zhi-wei Zhou,Xing Li,Yan-ling Yang,Jing-feng Gao,Rui Yu,Hui-ping Wang,Nan Wang
Photocatalysis-activated sulfate-radical advanced oxidation process (SR-AOP) is an effective approach to remove organic micropollutants from water. Here, we tested a photocatalysis-activated SR-AOP in which peroxydisulfate (PDS) was activated by composites of Bi 2 O 3 -TiO 2 photocatalyst supported onto commercial powdered activated carbon (Bi 2 O 3 -TiO 2 /PAC) under visible light irradiation. This “Vis-Cata-PDS” treatment exhibited outstanding degradation performance (97.96% removal) towards sulfamerazine (SMZ) following optimized reaction conditions of 0.1 g/L Bi 2 O 3 -TiO 2 /PAC and 0.1 g/L PDS at pH of 7. Synergistic effects were observed between the visible-light photocatalytic activation of PDS via direct electron transfer and nonradical PDS activation over pristine PAC within Bi 2 O 3 -TiO 2 /PAC. Both active radicals (SO 4 ·− , h + , ·O 2 − ) and nonradical singlet oxygen ( 1 O 2 ) and the mediated electron transfer of pristine PAC within Bi 2 O 3 -TiO 2 /PAC were contributed to SMZ degradation. Based on intermediates identified by Liquid Chromatograph-Mass Spectrometer (LC-MS) combined with density functional theory (DFT) calculations, three degradation pathways were proposed and that were mostly attributed to SO 2 extrusion/Smiles-type rearrangement and S-N bond cleavage, and toxicity of intermediates were effectively alleviated. An inhibitory effect on SMZ degradation was observed for presence of HCO 3 − , whereas presence of SO 4 2− was less inhibitory and Cl − had no effect. The Bi 2 O 3 -TiO 2 /PAC composite displayed excellent reusability and stability, and it was effective towards a number of tested micropollutants (sulfadiazine, sulfamethoxazole, ciprofloxacin, bisphenol A and methyl orange) and in real water matrixes. This work offers deep insights into the nonradical oxidation mechanism and application of Vis-Cata-PDS over a Bi 2 O 3 -TiO 2 /PAC composite for removal of organic micropollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Weijie Hua,Yong Kang
Due to the increasingly severe water contamination of antibiotics, high-efficient and green removal of antibiotics from aqueous solution is of great significance to environmental remediation and human health. The combined degradation of tetracycline hydrochloride (TCH) in water by pulsed discharge plasma on water surface (WSPDP) coupled with CaFe 2 O 4 /Bi 2 O 3 composite was investigated. The basic properties of the prepared CaFe 2 O 4 /Bi 2 O 3 composite were analyzed by XRD , SEM, TEM, PL and XPS, which indicated that the CaFe 2 O 4 /Bi 2 O 3 sample was synthesized successfully. Degradation performance revealed that there existed a synergistic effect in the WSPDP + CaFe 2 O 4 /Bi 2 O 3 system, and WSPDP could induce catalysis of CaFe 2 O 4 /Bi 2 O 3 composite. After adding 0.4 g/L 7 wt% CaFe 2 O 4 /Bi 2 O 3 sample to the WSPDP system, the degradation efficiency of TCH improved from 82.9% to 93.8%, and the kinetic constant enhanced from 0.0616 min −1 to 0.0953 min −1 after 30 min of discharge treatment. Furthermore, the effects of pulse peak voltage, pulse frequency, initial pH of solution and air flow rate on TCH degradation were evaluated. The highest TCH degradation efficiency of 97.8% could be obtained at the peak pulse voltage of 24.6 kV, pulse frequency of 50 Hz, initial pH of 3 and air flow rate of 2 L/min within 30 min. OH, h + and O 2 − were the main reactive radicals for TCH degradation in the WSPDP + CaFe 2 O 4 /Bi 2 O 3 system·H 2 O 2 and O 3 were also involved in TCH degradation of the synergistic system, and the addition of CaFe 2 O 4 /Bi 2 O 3 could significantly improve the utilization of H 2 O 2 and O 3 in the solution. The intermediates of TCH degradation were identified by liquid chromatography-mass spectrometry (LC-MS). Finally, the possible degradation pathways and synergistic degradation mechanism of TCH in the WSPDP + CaFe 2 O 4 /Bi 2 O 3 system were proposed.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 329
·期 3
·1467-1476
·
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
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Huixuan Zhang,Li-chao Nengzi,Zhongjuan Wang,Xinyi Zhang,Bo Li,Xiuwen Cheng
Advanced oxidation methods based on photocatalysis and sulfate radicals have attached most interest towards contaminant degradation. However, there are a lack of coupling two methods in the field of pollutant degradation . In the present study, a new Bi 2 O 3 /CuNiFe LDHs composite was fabricated and it could efficiently activate persulfate (PS) for lomefloxacin (LOM) decomposition under simulated sunlight, in which 84.6% of LOM (10 mg·L −1 ) was degraded over 40 min with 0.4 g·L −1 of Bi 2 O 3 /CuNiFe LDHs composite and 0.74 mM of PS at natural pH. In addition, the Bi 2 O 3 /CuNiFe LDHs composite possessed good reusability and stability at least four runs. Moreover, active radical scavenging experiments indicated that hydroxyl radicals (HO·), sulfate radicals (SO 4 · − ), superoxide radicals (O 2 · − ) and hole (h + ) were the main radicals under LOM degradation process. Subsequently, the possible degradation intermediates were determined and the decomposition pathways were put forward. At the same time, activated sludge inhibition experiments were performed to assess the variation of toxicity of LOM and its degradation intermediates during oxidation. Finally, possible reaction mechanism of Bi 2 O 3 /CuNiFe LDHs composite for PS activation under simulated sunlight was proposed.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Wei Jin,Yanqiu Fu,Meiqing Hu,Shiqi Wang,Zhonggang Liu
The sensitive detection and efficient removal of heavy metal ions with high toxicity and mobility are of great importance for the environmental monitoring and control. Here, a novel SnS-decorated Bi 2 O 3 nanosheets heterostructure was synthesized via a facile hydro/solvothermal strategy. The as-prepared SnS-Bi 2 O 3 nanocomposites presented impressive merits of the high surface area, mesoporous channels and fast electron transfer for the electrochemical reactions . And the synergistic interaction between SnS and Bi 2 O 3 significantly improved the “deposition-stripping” process involving electron transfer, mass diffusion and phase transition. With the unique characteristics, the SnS-Bi 2 O 3 nanocomposites exhibited improved sensitivity and robust stability on the electrochemical detection of Cd(II) and Pb(II) with low LODs of 1.50 nM and 1.40 nM, respectively, and were successfully applied on the detection of Cd(II) and Pb(II) in tap water and lake water samples. Furthermore, the electrochemical removal performance towards Cd(II) and Pb(II) was achieved as well. These SnS-Bi 2 O 3 nanocomposites could serve as an efficient platform on the detection and removal of heavy metal ions in environmental electrochemistry .
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