CHEMICAL ENGINEERING JOURNAL
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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.
研究领域:
环境科学
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化学工程
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水处理
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高级氧化过程
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DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 15
·3528
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IF 3.2
Lai Liu,Huizhen Yao
Photoelectrochemical devices have garnered extensive research attention in the field of smart and multifunctional photoelectronics, owing to their lightweight nature, eco-friendliness, and cost-effective manufacturing processes. In this work, Bi2S3/Bi2O3/TiO2heterojunction film was successfully fabricated and functioned as the photoelectrode of photoelectrochemical devices. The designed Bi2S3/Bi2O3/TiO2photoelectrochemical photodetector possesses a broad light detection spectrum ranging from 400 to 900 nm and impressive self-powered characteristics. At 0 V bias, the device exhibits an on/off current ratio of approximately 1.3 × 106. It achieves a commendable detectivity of 5.7 × 1013Jones as subjected to a 0.8 V bias potential, outperforming both bare TiO2and Bi2O3/TiO2photoelectrochemical devices. Moreover, the Bi2S3/Bi2O3/TiO2photoelectrode film shows great promise in pollutant decomposition, achieving nearly 97.7% degradation efficiency within 60 min. The appropriate band energy alignment and the presence of an internal electric field at the interface of the Bi2S3/Bi2O3/TiO2film serve as a potent driving force for the separation and transport of photogenerated carriers. These findings suggest that the Bi2S3/Bi2O3/TiO2heterojunction film could be a viable candidate as a photoelectrode material for the development of high-performance photoelectrochemical optoelectronic devices.
研究领域:
光电化学
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材料科学
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纳米技术
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光电子器件
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环境工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Nan Wang,Xing Li,Yanling Yang,Yi Shang,Xiaoxuan Zhuang,Hang Li,Zhiwei Zhou
Photocatalysis or coagulation process has been separately studied for the removal of natural organic matter (NOM) from surface water, and the reaction mechanism of organic fractionations of treated effluent has been clarified. Although coagulation-based process has been extensively studied for NOM removal, few attempts have been made based on a combined process that can not only efficiently degrade NOM, but also enhance the coagulation performance. The hypothesis is that a combination of photocatalysis and coagulation process in a single unit might potentially enhance NOM removal efficiency. This is because the nano-photocatalyst can serve as both pre-oxidant and flocculation core. Herein, a combined process of visible light photocatalysis prior to coagulation is conducted, with the transformation efficiency of the organics fractionations revealed. The as-prepared nano-sized photocatalyst consisting of Bi 2 O 3 -TiO 2 (molar Bi/Ti ratio 0.04:1) had a stronger visible light absorption ability. Compared to coagulation alone, the combined photocatalysis-coagulation process greatly improved NOM removal, with synergistic effect, while the pre-photocatalysis reduced the required dosage of polyaluminium chloride (PACl) coagulant and increased the optimal pH of solution. A mathematical model optimized by response surface methodology of the combined process was developed that produced a good correlation between predicted and experimental values. The optimal conditions were calculated as follow: 2.0 g/L photocatalyst, a photocatalytic reaction time of 10 min 18 sec, 0.04 mM PACl coagulant, and a pH of 4.2. These conditions particularly enhanced removal of acidic hydrophobic substance, humic-/protein-like substances and fractions with molecular weight between 3 and 44 kDa. The XRD spectra and SEM images of the produced flocs identified that these flocs consisted of a core of photocatalyst, which could contribute to an effective flocculation and enhanced NOM removal.
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
Water
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2020
·Vol. 12
·期 8
·2273
·
IF 2.544
Xiaoxuan Zhuang,Xing Li,Yanling Yang,Nan Wang,Yi Shang,Zhiwei Zhou,Jiaqi Li,Huiping Wang
The presence of sulfonamides (SAs) in water has received increasing attention due to the risk to ecosystems. The adsorption and photocatalysis performance for sulfamerazine (SMZ) of Bi2O3–TiO2supported on powdered activated carbon (Bi2O3–TiO2/PAC) nanoparticles was evaluated. The amount of doped Bi2O3not only influenced the photocatalytic performance but also impacted the adsorption capacity. The adsorption mass transfer mechanism of Bi2O3–TiO2/PAC was elucidated and is further discussed in combination with the photocatalytic mechanism. It was indicated that Bi2O3–TiO2/PAC(10%–700 °C) performed best, and the SMZ removal by the adsorption–photocatalysis of Bi2O3–TiO2/PAC(10%–700 °C) reached 95.5%. Adsorption onto active sites was a major adsorption step, and external diffusion was assisted. Superoxide radical (●O2−) and hole (h+) were identified as the major reactive oxygen species (ROS) for SMZ removal. Benzene ring fracture, SO2extrusion and nitrogenated SMZ were proposed as the main pathways for photocatalysis. Meanwhile, alkaline conditions enhanced photocatalytic performance, while contrary effects were observed for adsorption. The adsorption–photocatalysis removal performance for SMZ in lake water was better than that for river water. It can be generalized for the potential application of photocatalysis coupling with adsorption to remove refractory antibiotics in water.Keywords:photocatalysis;adsorption;solar irradiation;ternary composite;sulfamerazine
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Yajun Pang,Yuwei Li,Guangqing Xu,Yating Hu,Zongkui Kou,Qiang Feng,Jun Lv,Yong Zhang,John Wang,Yucheng Wu
An effective photoelectrochemical sensor is urgently needed for monitoring of the environmental pollution caused by organic wastes. In this work, we report a facile in-situ illumination-assisted process to introduce uniform metal oxide (Bi 2 O 3 ) nanocrystals of 2–3 nm in sizes on carbon bridged TiO 2 nanotube arrays (TiO 2 NTAs) (Bi 2 O 3 /C@TiO 2 NTAs), in which the carbon functions as both electron trapping for high efficiency and system integration. The Bi 2 O 3 /C@TiO 2 NTAs thus made exhibit a highly selective photoelectrochemical determination performance, with low background photocurrent (derived from the decomposition of water) and high detection current (derived from the decomposition of organics target). In particular, the current detection of the Bi 2 O 3 /C@TiO 2 NTAs is 3.38 times higher than that of the pristine TiO 2 NTAs. To understand the key working principles involved, they are scrutinized by probing into the photoelectrochemical reaction process, including the light absorption, charge separation and transfer, and surface reactions. With the novel Z-scheme heterostructure system being achieved with Bi 2 O 3 /C@TiO 2 NTAs, the present work demonstrates the potential of metal oxides with uniform size in nanometer range and conductor-bridged strategy in creating Z-scheme heterostructure system with high photoelectrochemical detection performance for organics.
研究领域:
环境科学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2025
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IF 5.6
Keyu Chen,Yu He,Bixuan Zhu,Chuanyezi Cai,Jiacheng Guo,Ruiqi He,Xi Chen,Lu Ye,Jianjun Zhang,Sude Ma
As the communications industry continues to develop, low temperature co-fired ceramics are used as resonators in multilayer chip components of integrated circuits. In order to co-fire with the metal, it is necessary to reduce the sintering temperature of ceramics to below 960 °C. In order to rule out the impact of changes in the operating temperature of the ceramic material, we need to adjust the resonant frequency temperature coefficient to near zero. This paper discusses the application of a temperature-stable low-temperature sintered dielectric material derived from Li 2 ZnSiO 4 (LZS) in low-temperature co-fired ceramics (LTCC). The addition of the low melting point oxide Bi 2 O 3 resulted in a significant reduction of the sintering temperature and improvement of the densification of LZS ceramics, where the sintering temperature was reduced from 1200 °C to 900 °C. The relative density and microwave dielectric properties (dielectric constant ε r , quality factor Q × f and temperature coefficient of resonant frequency τ ƒ ) of LZS- x Bi 2 O 3 ( x = 0, 3, 6, 9, 12 mol%) ceramics sintered at different temperatures increase and then decrease with increasing Bi 2 O 3 content. The best performance was obtained when the Bi 2 O 3 addition was 9 mol% (ε r = 6.87, Q × f = 28,151 GHz, τ ƒ = - 85.2 ppm/°C). By increasing the amount of TiO 2 added to LZS-9 mol%Bi 2 O 3 , the τ ƒ value of the ceramic system can be continuously increased, which is effectively adjusted to near zero. The best integrated dielectric properties of the LZS-Bi 2 O 3 -TiO 2 ceramic system (ε r = 8.9, Q × f = 22.982 GHz, τ ƒ = - 8.34 ppm/°C) are obtained when the TiO 2 addition is 30 wt%. This suggests that LZS-Bi 2 O 3 -TiO 2 ceramics have potential for low-temperature co-fired ceramics (LTCC) applications.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2020
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IF 7.246
Nan Wang,Xing Li,Yanling Yang,Zhiwei Zhou,Yi Shang,Xiaoxuan Zhuang
Various pretreatments of raw surface water before ultrafiltration (UF) to retard membrane fouling due to natural organic matter (NOM) were compared in this study. Water treatment by conventional coagulation, visible light irradiation with the presence of a novel photocatalyst of Bi 2 O 3 –TiO 2 supported onto powder activated carbon (Bi–Ti/PAC), and their combination were compared in terms of removal of NOM and the optimal conditions were determined. The composite nano-photocatalyst of Bi–Ti/PAC could function as a pre-oxidant and a flocculation core assisting coagulation. Experiments results show that 58% of the NOM present could be removed by quantization of dissolved organic carbon in the combination treatment under optimal conditions of 2.0 g/L of photocatalyst dosage with light exposure of 20 min and 0.04 mmol polyaluminium chloride coagulant dosage with a solution pH of 7. The combined pretreatment with UF produced a reduction of 88% in total membrane fouling, with reversible and irreversible fouling being significantly decreased because of the removal of hydrophilic , protein- and humic-like substances, along with degradation and removing of medium-molecular weight (MW) and high-MW compounds into smaller molecules. Models used to fit the generated data indicated that the provided combined pretreatment had largely reduced standard blocking of the membrane pores. The effectiveness of the pretreatment was confirmed by characterization of the hydraulic irreversible organic foulants. This work demonstrated the potential advantages of combining photocatalysis with coagulation as a pretreatment of raw surface water and subsequent UF in simultaneously controlling membrane fouling and improving the permeate quality.
研究领域:
环境科学
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水处理工程
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产品关联
DOI
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Nan Wang,Xing Li,Yanling Yang,Tingting Guo,Xiaoxuan Zhuang,Siyang Ji,Tingting Zhang,Zhiwei Zhou
A series of Bi–Ti composited photocatalysts with different molar ratio of Bi/Ti (0.01:1(1%), 0.02:1(2%), 0.04:1(4%), and 0.05:1(5%)) and calcination temperature (400°C, 500°C, and 600°C) were prepared by sol-hydrothermal method. The properties of as-prepared photocatalysts were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photo-electron spectroscopy, Brunauer–Emmett–Teller, and ultraviolet–visible diffuse reflection spectroscopy. The selected photocatalyst (Bi-Ti-4%-600°C) was prepared under Bi/Ti molar ratio of 4% and calcination temperature of 600°C. Experimental variables during photocatalytic degradation were optimized for catalyst dosage, solution pH, initial bisphenol A (BPA) concentration, coexisting anions, and light source wavelength. Under optimal conditions of 1.0 g L –1 catalyst, pH 3, 30 mg L –1 initial BPA concentration, the degradation rate of BPA could reach up to 100% at 150 min under visible light irradiation. Compared with self-made pure TiO 2 and commercially available P 25 , Bi-Ti-4%- 600°C displayed an excellent photocatalytic activity for BPA degradation. Bi-Ti photocatalyst had a smaller crystal size, larger specific surface area, stronger visible light absorption ability, and lower band gap energy than self-made pure TiO 2 . Four intermediates of BPA degradation were identified and a possible degradation pathway was proposed.
研究领域:
环境科学
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材料化学
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光催化
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纳米材料
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水处理
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
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IF 5.8
Lang Xiao,Weiping Gong,Zhao-hui Long,Jiahui Zhao,Duoduo Zhang,Ting Wang,Kai Li,Alexandra Navrotsky
Formation kinetics and equilibrium thermodynamics are fundamental knowledge for predicting microstructure and properties during materials processing and utilization. This work prepared high purity Bi 12 TiO 20 , Bi 4 Ti 3 O 12 and Bi 2 Ti 4 O 11 compounds and characterized these compounds by in-suit X-ray diffraction, scanning electron microscope, energy dispersive spectrometer as well as calorimetry. Based on the experimental data obtained in this work and the literature, a thermodynamic description of the Bi 2 O 3 –TiO 2 system was carried out, a thermodynamic database as well as the calculated phase diagram of the system was provided. The discrepancy between the present calculation with the experimental data were discussed, the formation kinetics of the compounds was explained and the bismuth titanate ceramics with tailored structure and specific physical properties were sintered.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Jin Qin,Shangshi Ye,Kai Yan,Jingdong Zhang
A visible light-driven photoelectrocatalytic system was constructed based on Bi/Bi 2 O 3 /TiO 2 nanotubes (NTs) to treat wastewater containing oxytetracycline and Cu 2+ mixed pollutants. The surface morphology , crystal phase, elemental composition , light absorption property and photoelectrochemical activity of the synthesized Bi/Bi 2 O 3 /TiO 2 NTs were investigated. The composite film , Bi/Bi 2 O 3 /TiO 2 NTs was used for the photoelectrochemical removal of oxytetracycline, and it had excellent visible light photoelectrocatalytic performance. Under optimal conditions, the composite film was simultaneously used to remove coexisting oxytetracycline-Cu 2+ . The study results show that the reduction of Cu 2+ on cathode was promoted by oxytetracycline while the degradation of oxytetracycline on photoanode was slightly suppressed by Cu 2+ . Also, possible photoelectrocatalytic degradation pathways for oxytetracycline-Cu 2+ were analyzed by HPLC-MS.
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
MICROCHEMICAL JOURNAL
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2023
·
IF 4.8
Gang Tian,Jingyu Lin,Yu Zhou,Ziyu Huang,Xiaoping Wei,Jianping Li
A novel extended-gate field-effect transistor based molecularly imprinted polymer photoelectrochemical (EGFET-MIP-PEC) sensor was constructed for the detection of neomycin in meat samples. Bi 2 O 3 /TiO 2 NTs heterojunction materials were synthesized by anodic oxidation and electrodeposition. With neomycin as the template and 3-aminophenylboronic acid as the functional monomer, a molecularly imprinted film was prepared on the Bi 2 O 3 /TiO 2 NTs electrode by electropolymerization. The MIP/Bi 2 O 3 /TiO 2 NTs electrode was connected to an extended-gate field-effect transistor. Under the irradiation of xenon lamp simulated visible light, the holes generated on the MIP/Bi 2 O 3 /TiO 2 NTs electrodes oxidize the neomycin adsorbed by the molecularly imprinted film, generating a photovoltage, which causes the gate voltage of the extended-gate field-effect transistor to change, thereby increasing the source-drain current. The sensor showed good linearity with the source-drain current in the neomycin concentration range of 5.0 × 10 −13 –5.0 × 10 −8 mol L −1 , with a detection limit of 1.0 × 10 −13 mol L −1 (3σ/S). Owing to the amplification of EGFET on photoelectrochemical signal produced by the Bi 2 O 3 /TiO 2 NTs heterojunction with high photoelectric conversion efficiency and wider wavelength range of optical response, the sensitivity of the sensor was significantly improved. The selectivity of the sensor was remarkably enhanced due to the MIP film.
研究领域:
分析化学
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生物传感技术
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Zhiwei Zhou,Jiakang Yan,Xing Li,Jiawei Ren,Heng Liang,Yongwang Liu
Algal intracellular organic matter (IOM), released during algae's normal growth phase and water treatment processes, has long been a source of significant membrane fouling , considerably limiting the effective use of ultrafiltration(UF) technology. In this study, a Bi-doped TiO 2 composite with powdered activated carbon (Bi 2 O 3 –TiO 2 /PAC) was loaded on ceramic UF membranes by vacuum filtration, and the prepared photocatalytic modified ceramic membranes (MCMs) were investigated for the removal of IOM and the mitigation of membrane fouling at different loading levels and under three operating conditions: Dark, Dark-UV, and UV. The results showed that the photocatalytic MCMs were able to remove the protein and humic acid fluorescent components of IOM and decompose or mineralize organic matter with molecular weights of 10–50 kDa. Under the Dark, Dark-UV, and UV conditions, the final normalized flux of MCM-2.88 was significantly increased by 22.6 %, 82.1 %, and 108.0 %, respectively. The hydrophilicity of MCMs not only transformed the interactions between IOM and the membrane into repulsive forces, but also the composite material on the membrane surface transforms the membrane fouling mechanism from intermediate blocking model to cake layer formation. Furthermore, the application of photocatalytic oxidation under the Dark-UV and UV conditions yielded a reduction in both reversible and irreversible fouling. This action led to an increased hydrophilicity and elevated free energy of adhesion with IOM during the filtration process. Moreover, the main fouling mechanism changed into complete or intermediate blocking. These outcomes collectively underscore the capability of MCMs to alleviate membrane fouling induced by IOM. This advancement holds substantial promise for the advancement and widespread implementation of photocatalytic ceramic membrane filtration techniques.
研究领域:
环境科学
·
水处理技术
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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）