Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Yuyan Wang,Hongxia Zhang,Wei Gao,Ming Zhong,Bitao Su,Ziqiang Lei
In this work, two series of plasmonic S-type heterojunction photocatalysts containing Bi, TiO 2 , and biochar (Bi/TiO 2 @C) have been developed through a biomass-assisted hydrothermal-calcination strategy, utilizing grapefruit peel as a reducing agent and C resource. The calcination temperature and the mass ratio of biomass were optimized to obtain the optimal nanocomposite, which shows excellent adsorptive and visible-light photocatalytic performance in the removal of diverse antibiotic and dye pollutants, including tetracycline, oxytetracycline, ciprofloxacin, sulfamethoxazole, sulfisoxazole, malachite green, and rhodamine B. The remarkable performance can be attributed to the enhanced absorption of light absorption resulting from the localized surface plasmon resonance effect of the semimetal Bi, and the formation of heterogeneous interface between Bi and TiO 2 , which accelerates the transfer of photogenerated charge. Furthermore, trapping tests and electron spin resonance (ESR) analysis reveal that ∙O 2 - and h + are the primary active species involved in the removal of tetracycline. A plausible charge transfer mechanism has been proposed.
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Desalination and Water Treatment
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2024
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IF 1
Xu Zuo,Shiyang Zou,Junrong Wu,Bingquan Ding,Aijun Jiang
Herein, core–shell Ag@SiO 2 /TiO 2 nanocomposites were synthesized and applied to activate peroxydisulfate (PDS) for wastewater purification. The Ag core and Ag-doped TiO 2 shell were obtained by stober method and calcination method. The dispersion degree and size of Ag in TiO 2 would influence the oxygen vacancy. Ag enhanced the visible absorption of TiO 2 and activated PDS. Improved degradation performance was attributed to enhanced PDS activation by photogenerated e − , which separated h + and thus promoted methyl orange(MO) degradation. Reactive oxidative species were verified under dark and light conditions via quenching experiments and electron paramagnetic resonance tests, demonstrating SO 4 •– , h + , O 2 •– , and 1 O 2 were formed in light,whereasSO 4 •– , •OH, O 2 •– , and 1 O 2 were responsible for MO degradation under dark conditions. The Ag@SiO 2 /TiO 2 /PDS/light system showed selectivity for removal of cationic dyes (e.g., methylene blue and malachite green) through adsorption and photocatalysis, whereas anionic dyes (e.g., MO) were degraded by photocatalysis alone. Besides, we found excess adsorption of micropollutant onto catalyst may be adverse to the activation of PDS. Therefore, the adsorption of oxidant (such as PDS) onto the catalyst surface would be beneficial for catalytic activation and micropollutant degradation, especially onto active sites. This work aims to provide a new avenue for core-shell structure catalyst synthesis in wastewater purification.
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FUEL
·
2025
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IF 7.5
Sheng-Zhe Zhao,Rui-Dong Shi,Guo-Tao Xiang,Yong-Da Hu,Jin-Ju Chen
The system of photocatalytic fuel cells (PFC) emerges as a significant innovation within the realm of energy conversion technologies, harnessing the potential of organic waste to produce electrical energy. In this study, we propose a novel approach for simultaneous electricity production and pollutant removal using a PFC system, which consists of Bi 2 O 3 /TiO 2 heterojunction nanotubes modified by g-C 3 N 4 as photoanode materials. The g-C 3 N 4 /Bi 2 O 3 /TiO 2 (CBT) heterostructure possesses a large specific surface area, improved visible light absorption, and enhanced photogenerated carrier separation capability. The morphology, composition, crystal structure, and optical properties of the synthesized CTB were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and UV–Vis diffuse reflectance spectroscopy (DRS). Using tetracycline hydrochloride as the target pollutant, the photocatalytic degradation performance of the CBT heterostructure is 3.2 times higher than that of pure TiO 2 nanotubes. Furthermore, the PFC system consisting of CBT as photoanode has a significant improvement in pollutant degradation and current output when compared with the PFC with pure TiO 2 . This study presents a cost-effective approach for organic waste treatment and simultaneous electricity production.
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Microsystems & Nanoengineering
·
2024
·Vol. 10
·期 1
·1-13
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IF 7.3
Han Donglai,Guo Boyang,Li Yanru,Feng Wei,Liu Keyan,Wu Tianna,Wan Yuchun,Wang Lili,Gao Ming,Liu Yang,Yang Lili,Wei Maobin,Yang Shuo
Facile and efficient photocatalysts using sunlight, as well as fast and sensitive surface-enhanced Raman spectroscopy (SERS) substrates, are urgently needed for practical degradation of tetracycline (TC). To meet these requirements, a new paradigm for PI/TiO 2 /Ag organic‒inorganic ternary flexible microfibers based on semiconducting titanium dioxide (TiO 2 ), the noble metal silver (Ag) and the conjugated polymer polyimide (PI) was developed by engineering a simple method. Under sunlight, the photocatalytic characteristics of the PI/TiO 2 /Ag flexible microfibers containing varying amounts of Ag quantum dots (QDs) were evaluated with photocatalytic degradation of TC in aqueous solution. The results demonstrated that the amount of Ag affected the photocatalytic activity. Among the tested samples, PI/TiO 2 /Ag-0.07 (93.1%) exhibited a higher photocatalytic degradation rate than PI/TiO 2 (25.7%), PI/TiO 2 /Ag-0.05 (77.7%), and PI/TiO 2 /Ag-0.09 (63.3%). This observation and evaluation conducted in the present work strongly indicated a charge transfer mechanism. Moreover, the PI/TiO 2 /Ag-0.07 flexible microfibers exhibited highly sensitive SERS detection, as demonstrated by the observation of the Raman peaks for TC even at an extremely low concentration of 10 –10 moles per liter. The excellent photocatalytic performance and SERS detection capability of the PI/TiO 2 /Ag flexible microfibers arose from the Schottky barrier formed between Ag and TiO 2 and also from the outstanding plasmonic resonance and visible light absorptivity of Ag, along with immobilization by the PI. The successful synthesis of PI/TiO 2 /Ag flexible microfibers holds significant promise for sensitive detection and efficient photocatalytic degradation of antibiotics.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Xuefeng Bai,Han Zhang,Yu Tu,Hao Ding,Sijia Sun
In this paper, a CaCO 3 /TiO 2 @SiO 2 composite pigment (CTS) was prepared by a carbonation reaction using a one-pot method. CTS can reduce the amount of rutile TiO 2 needed and improve the weatherability compared with TiO 2 and CaCO 3 /TiO 2 (CT). The performance test results showed that the composite pigment with 60% TiO 2 has a coating film contrast ratio of 91.05% of pure TiO 2 , and the oil absorption and whiteness values were also close to those of pure TiO 2 , indicating that the CTS has good pigment properties. The XPS and infrared results showed that the bonding of CaCO 3 , TiO 2 , and SiO 2 occurred at the interface. The tight bonding of the three substances was realized through a dehydroxylation reaction on the surface. In addition, the SiO 2 layer weaken the photocurrent response of TiO 2 in the CTS and reduced the UV absorption of the composite pigment, which slowed the degradation rate of rhodamine B in the composite pigment coatings; thus, the CTS exhibits excellent weatherability performance in coating applications.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Liangyong He,Bin Yang,Sen Wang,Yuqing Yang,Yingying Wang,Haiyang Hu,Zhengzhi Zheng,Jiashuo Liu,Jiasheng Qian,Jibin Miao,Weiguo Zhang,Yuchao Ke
The increasing demand for improving the performance of optical devices and the development of nanotechnology have driven research on diffusion films. The preparation of diffusion films with well-defined microstructures can achieve uniform diffusion and scattering of light, thereby improving the efficiency and performance of optical devices. In this study, diffusion films with high transmittance and haze were prepared using PMMA@TiO2@SiO2 (P@T@S) composite microspheres, and the PMMA microspheres and nanoparticles were combined through electrostatic attraction. As compared with PMMA microspheres, the P@T@S composite microspheres displayed better heat resistance as well as swelling resistance. Optical performance data showed that the P@T@S diffusion film had the perfect optical performance with a transmittance up to 90.5% and a haze of 88.3%. The excellent light diffusion effect of the P@T@S diffusion film was experimentally demonstrated, with the light through the film not only displaying the largest area but also maintaining a relatively high brightness. Our findings can provide reference and guidance for further development of light diffusion films, which are of potential application in optoelectronic devices.
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ACS Applied Electronic Materials
·
2024
·
IF 4.3
Zhihua Zhao,Yao Wang,Bo Li,Pu Chen,Guixin Jin,Xiaoqing Shen,Zhigang Shao,Lan Wu
With the rapid advancement of wearable technology, multifunctional sensors have garnered significant attention due to their potential applications in environmental monitoring, health diagnostics, and human−machine interaction. Despite their promise, challenges, such as limited flexibility, insufficient sensitivity, and complex production processes, have hindered their practical deployment. This study presents the fabrication of a multifunctional flexible sensor based on PU-supported Ti3C2Tx/TiO2/PPy yarns for both ammonia (NH3) gas sensing and human motion detection. Key innovations include the incorporation of polypyrrole (PPy) into the Ti3C2Tx MXene structure and the optimization of titanium dioxide (TiO2) content through varying hydrothermal times, which significantly enhance the gas sensing performance. The sensor demonstrates exceptional sensitivity and selectivity toward NH3, with a rapid response and recovery times. Additionally, the PU-supported composite yarns exhibit excellent mechanical flexibility and durability, maintaining stable performance under repeated stretching and bending cycles. In human motion detection, the sensor shows high sensitivity and reliable performance in monitoring various physical activities, making it highly suitable for applications in wearable electronics. These features ensure the sensor’s applicability in diverse settings, promoting safety and health in environments with potential ammonia exposure and enhancing human−machine interactions through accurate motion monitoring.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Mengshi Chen,Zihan Kang,Jiang Wu,Ni Qin,Dinghua Bao
The construction of recyclable films with unique morphology and piezoelectric-enhanced photocatalytic performance is of great significance for wastewater purification. Here, inverse opal structured ZnO@TiO 2 nanocomposite film were prepared by template method and chemical water bath method. The piezo-photocatalytic properties of the obtained ZnO@TiO 2 nanocomposite films were evaluated by the degradation of organic dyes. The results showed that the piezo-photocatalytic constant rate of the ZnO@TiO 2 nanocomposite films under the synergistic action of ultrasound and ultraviolet light reached 52.3×10 −3 min −1 , much higher than those of the pure inverse opal TiO 2 framework under same condition (6.6×10 −3 min −1 ) and the ZnO@TiO 2 nanocomposite films under only ultraviolet light (10.1×10 −3 min −1 ) or only ultrasound (2.0×10 −3 min −1 ). It is believed that the inverse opal structured TiO 2 framework not only provides an open space for ZnO nanorods growth, but also initiates redox reaction for dye degradation through generation and transfer of photo-generated carriers under ultraviolet irradiation. Meanwhile, the ZnO nanorods can efficiently promote carrier separation by piezoelectric polarization electric field and interface contact induced band tilting with TiO 2 , thus significantly improving the piezo-photocatalytic activity. This work provides a novel route for reasonable design of recyclable and efficient piezo-photocatalytic films.
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ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Jiwen Li,Yaqian Duan,Linlin Wang,Jingjun Ma
The poor light absorption and low carrier separation efficiency of Titanium dioxide (TiO 2 ) limit its further application. The introduction of plasma metal Ag have the potential to solve these drawbacks owing to its plasma resonance effect. Thus core-shell structure Ag@TiO 2 plasma photocatalysts was prepared by using facile reduction method in this work. More specifically, Ag@TiO 2 composite catalysts with different Ag loading amounts were prepared in the presence of surfactant PVP. Ag@TiO 2 demonstrates excellent light absorption performance and photoelectric separation efficiency compared with pure TiO 2 . As a result, it displays excellent performance of Cr(VI) reduction under visible light. The optimal composite catalysts Ag@TiO 2 –5P achieves exceptional visible-light-driven photocatalytic Cr(VI) reduction efficiency of 0.01416 min −1 that is 2.29 times greater than pure TiO 2 . To investigate the role of PVP, we also synthesized Ag@TiO 2 -5 without PVP. The experimental results show that although Ag@TiO 2 -5 Cr(VI) reduction performance is superior to pure TiO 2 , it significantly decreases compared with Ag@TiO 2 –5P. The results of TEM and optoelectronic testing show that agglomeration of Ag particles leads to a decrease in the photoelectric separation efficiency of Ag@TiO 2 -5. The smaller Ag particles provide more active sites and demonstrating a stronger overall local surface plasmon resonance (LSPR) effect. DMPO spin-trapping ESR spectra testing indicates that ∙O 2 − and ∙OH are the main reactive species. This research provides a potential strategy to prepare Ag-based plasma photocatalysts for environment protection.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Mengtian Cui,He Wang,Xia Fan,Jianhao Zhang,Changrui Xing,Wenjing Yan
The widespread use of organophosphorus pesticides (OPPs) in foods, poses a serious threat to human and environmental health, it is crucial to develop methods that can efficiently degrade residual OPPs . Herein, a chiral TiO 2 photocatalyst was developed by modification TiO 2 with D-cys/Au NPs (DAT) for the simultaneous degradation of four OPPs (chlorpyrifos, chlorpyrifos-methyl, malathion, and parathion) by natural light. The influence of D-Au NPs concentration on the degradation process was optimized, along with the initial pesticide concentration. Under optimal conditions, the photocatalytic degradation efficiencies of DAT for four OPPs were 96.7 %, 56.9 %, 42.6 %, and 49.2 %, respectively, after 12 h of natural light exposure. 12 degradation products of OPPs were identified, among which three products were identified for the first time. The degradation pathway revealed that the degradation of OPPs by DAT involves the oxidation of the P═S bond and the cleavage of the P-O bond and C-O bond. This study establishes a theoretical foundation for applying chiral TiO 2 nanomaterials for the photocatalytic degradation of OPPs in foods.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Huiling Li,Li Tian,Shuning Yang,Chao Li,Ruidan Li,Yujia Song,Yanjia Guo,Xuwen Li
To sensitively monitor trace-level of malathion (MAT) in vegetable samples, an ultrasensitive solid-state electrochemiluminescence (ECL) sensor was proposed based on TiO 2 @CdSe and Ru(bpy) 3 2+ @Ag NPs. In this system, the introduction of Ag NPs enhanced the initial ECL signal of Ru(bpy) 3 2+ - tripropylamine (TPrA). When TiO 2 @CdSe was introduced into the system, the ECL signal was further enhanced, which may be due to the synergistic effect of the two complexes. Based on the fact that the addition of MAT causes ECL strength to decrease, a ECL sensor for the ultrasensitive trace detection of MAT has been successfully established. Under the optimized conditions, a wide liner detection range of MAT concentrations from 4.0 × 10 −14 to 4.0 × 10 −9 mol L −1 and a low detection limit (S/N = 3) of 1.3 × 10 −14 mol L −1 were obtained. The ECL sensor has been applied to the detection of vegetable samples and satisfactory results were obtained.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Bo Li,Xuxia Zhang,Xin Yang,Yuhong Xu,Weilong Chun,Qingqing Hao,Jianbo Zhang,Zhuo Li,Huiyong Chen,Xiaoxun Ma
Ti 3+ defective TiO 2 nanoparticles (TiO 2 -NPs) were synthesized through slow hydrolyzation of tetrabutyl titanate and low-temperature annealing, followed by loading on self-pillared pentasil (SPP) zeolite nanosheets to construct a TiO 2 /zeolite hybrid composite by solid-state dispersion. The obtained TiO 2 -NPs/SPP composite exhibited a distinct red-shift in the UV–vis absorption spectrum and a significantly reduced band gap due to the introduced Ti 3+ defects and the consequent oxygen vacancies (V O ), leading to an enhanced visible-light responsivity. The diverse porosity and house-of-cards nanosheet morphology of the SPP support not only promoted the efficient loading and stable immobilization of TiO 2 -NPs nanoparicles through micropore migration and surface adhesion but also endowed the adsorbability to the TiO 2 -NPs/SPP composite. The adsorptive photodegradation of methylene blue (MB) was used to evaluated the photocatalytic performance of TiO 2 -NPs/SPP, and a 95.6 % degradation rate of MB was observed after 3 h illumination with visible-light. The adsorptive effect strongly promoted the accessibility of MB molecules to the active TiO 2 species, leading to a remarkable enhancement in degradation efficiency. Moreover, a superior recyclability embodied in the retention of 96.4 % photocatalytic activity after three regeneration cycles indicated the TiO 2 -NPs/SPP composite to be practical for water pollutant degradation.
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