Journal of Water Process Engineering
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2024
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IF 6.3
Ruizhen Liu,Huaiyuan Jiang,Ping Li,Jianfei Yin,Zhengrui Xu,Xiaoyu Chen,Jian Cheng,Shuangxi Gu,Renliang Lyu
Antibiotic pollution has posed environmental risks, and the crucial point lies in the elimination efficiency of antibiotics from wastewater. Herein, a ternary-structured B-TiO 2 /Bi 2 S 3 /PCs (photonic crystals) film, in which B-TiO 2 was a blend of anatase and rutile crystalline phases, was fabricated to evaluate the efficiency of antibiotic photodegradation under visible light irradiation. The synthesized B-TiO 2 (80 %)/Bi 2 S 3 /PCs(458) film exhibited superior photocatalytic efficiency of tetracycline hydrochloride (TC), with a degradation rate 7.56 times greater than that of pristine B-TiO 2 . These findings are closely related to the excellent photoelectron separation of the heterojunction between B-TiO 2 and Bi 2 S 3 , as well as the bandgap reflection effect and light localization effect of the PCs . Notably, the B-TiO 2 (80 %)/Bi 2 S 3 /PCs(458) film also displayed favourable degradation performance for ofloxacin (OFLX) and ciprofloxacin (CIP), with degradation rates of 83.98 % and 72.79 %, respectively. Active species trapping experiments and electron spin resonance (ESR) measurements revealed superoxide radicals (•O 2 − ) and photogenerated holes (h + ) as the main active species. Furthermore, potential photodegradation pathways were proposed by analyzing the degradation intermediates of TC and OFLX via liquid chromatography-mass spectrometry (LC–MS). In a word, the B-TiO 2 (80 %)/Bi 2 S 3 /PCs(458) film exhibited high efficiency in the treatment of antibiotic pollutants, thereby offering promising prospects for practical application.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Leming Zhen,Zhaofu Meng,Qiyuan Qin,Wenhui Liu,Na Sun,Jingbing Xue,Jialong Lv
The wide application of antibiotics and nanoparticles has made their coexistence in soil a new environmental problem, and the coexistence of multiple pollutants in soil may impact their environmental behaviour. In this study, by dividing soil into coarse particle (CP) and fine particle (FP) phases via differential centrifugation, oxytetracycline (OTC) and TiO 2 nanoparticles (NPs) were selected as two typical pollutants to study their coadsorption behaviour on Lou soil. The coadsorption mechanism of OTC and TiO 2 NPs on Lou soil was discussed through their morphology and characteristics by using SEM, XRD, BET specific surface, XPS and FT-IR analyses. The adsorption capacity of OTC on the FP phase was much greater than that on the CP phase. Hydrogen bonding and charge attraction are the main adsorption mechanisms of OTC on both the CP and FP phases. π-π interactions are another main adsorption mechanism of OTC sorption on the FP phase. Hydrogen bonding and charge attraction are the main mechanisms of TiO 2 NPs sorption on soil. OTC and TiO 2 NPs compete on the surface of soil particles through charge attraction and hydrogen bonding, thus inhibiting their adsorption.
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CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Ju Cheng,Lei Zhang,Weigui Fu,Zihan An,Meixiu Sun,Yiping Zhao,Li Chen
Gelatin, a natural protein, is extensively used in the food, pharmaceutical, and cosmetics industries. However, purifying gelatin to meet the specific requirements of various industries remains a considerable challenge. Ceramic membrane separation technology, renowned for its high permeability, excellent anti-fouling properties, and long lifespan, has been widely applied in the food, biotechnology, and water purification industries. In this study, a sol-gel method was employed to fabricate a gradient multilayer TiO 2 -modified coating on the surface of an α-Al 2 O 3 porous ceramic membrane. The viscosity of the TiO 2 sols was adjusted by varying the concentrations of polyethylene glycol (PEG 2000) and aging times. The results indicated that coating the C-P5^5 composite membrane with a sol containing 5 wt% PEG, aged for different durations (2, 5, 10, 15, and 18 d), effectively reduced the weight-average molecular weight ( M w ) of the permeate from the feed solution of 52.4 kDa–11.9 kDa. However, the C-P10^5 composite membrane, with a 10 wt% PEG content and aged for the same durations, yielded a permeate gelatin M w of 13.6 kDa. The composite membrane with excellent anti-fouling and photocatalytic self-cleaning properties holds promise for innovative applications in gelatin purification and bio-separation processes.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
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IF 3.582
Haiyan Shen,Dawei Ni,Ping Niu,Yi Zhou,Tianyou Zhai,Ying Ma
Spatially controlled co-loading of both oxidation and reduction cocatalysts on semiconductor photocatalysts has been demonstrated to be favorable for photogenerated charge separation and thus enhanced photocatalytic activity. Herein, we presented a simple ball-milling method to improve photocatalytic H 2 production of TiO 2 by co-loading of oxidation cocatalyst Co 3 O 4 with reduction cocatalyst CuO , wherein the Co 3 O 4 loading amount was significant especially for TiO 2 loaded with sufficient or optimum CuO. In comparison with that on TiO 2 loaded with only CuO, the photocatalytic H 2 production from water over TiO 2 photocatalyst co-loaded with CuO and trace Co 3 O 4 was enhanced by approximately 5.5 times, even though complex spatial control was not adopted. In contrast, remarkable improvement of photocatalytic activity after Co 3 O 4 co-loading was only observed on TiO 2 photocatalysts loaded with less CuO in the presence of methanol. Better separation of photogenerated charges on the surface of dual-cocatalysts modified TiO 2 was further demonstrated by decreased luminescence as well as increased photogenerated electrons and hydroxyl radicals as compared to those loaded with only CuO.
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CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jindou Hu,Yali Cao,Jing Xie,Dianzeng Jia
To reduce the cost of the traditional noble metal-loaded photocatalysts for H 2 production, low-cost Ni(OH) 2 -TiO 2 nanocomposites were designed and synthesized by a simple room-temperature solid-state chemical method (RSCM), which is a facile, low-cost and eco-friendly manipulation. Various testing methods and tools were used to characterize the crystal structure, elemental composition, morphology, light absorption ability, fluorescent performance, photocurrent density, and photocatalytic activity of the obtained nanocomposites. The results indicated that RSCM can be used to synthesize Ni(OH) 2 -TiO 2 nanocomposites with a small size (50 nm) and good dispersity. Compared to pure TiO 2 , the obtained nanocomposites displayed excellent photocatalytic performance for H 2 production by photocatalytic water-splitting. The amount of hydrogen needed for the optional nanocomposite NOT-1 was 9180 μmol/g, which is 29 times that of the commercial P25. The reason for the improved performance for photocatalytic hydrogen production is that the existing Ni(OH) 2 in nanocomposites promoted the separation between the photogenerated electron and holes.
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CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Xiang Lv,Tianhe Wang,Wei Jiang
We report a facile method to prepare porous TiO 2 and ZnO photo-catalytic ceramics in which colloidal silica was added to yield nano fused silica (FS). The colloidal silica forms continuous media within the porous ceramic structure, and when calcined at 550 °C, it converted to fused silica phase which is an excellent UV wave-guiding material. With light wave guiding effect of FS and capillary effect of reaction solution in the porous channels, the photo-catalytic reactions could occur at the vast active sites at interface inside the porous bulks, as well as at the external surfaces. Photo-catalysis experiments and kinetics were investigated and analyzed. The photo-catalytic efficiencies tested for methylene blue were enhanced by a factor of 4.1 for TiO 2 /FS system and, astonishingly, by a factor of 34.6 for ZnO/FS system, when compared with pure TiO 2 and ZnO under identical testing conditions. A model of UV-waveguide ceramic systems was proposed and discussed. This study proposes a practical approach to construct UV-waveguide porous structures, of which the principle is also potentially applicable to other types of photo-catalytic materials, including visible light active photo-catalysts.
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Nano Energy
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2017
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IF 12.343
Jun Jin,Chao Wang,Xiao-Ning Ren,Shao-Zhuan Huang,Min Wu,Li-Hua Chen,Tawfique Hasan,Bin-Jie Wang,Yu Li,Bao-Lian Su
We demonstrate an alkali modification process to produce highly dispersed ultrafine Pt nanoclusters with metallic Pt 0 and oxidized Pt 2+ species as co-catalyst anchored on nanosheet-constructed yolk-shell TiO 2 (NYTiO 2 -Pt) acting as light harvesting reactor for highly efficient photocatalytic H 2 production. Benefiting from the high surface area, highly dispersed ultrafine Pt nanoclusters (~0.6 nm) with Pt 0 and Pt 2+ species and special nanosheet-constructed yolk-shell structure, this novel light harvesting reactor exhibits excellent performance for photocatalytic H 2 production. The NYTiO 2 -Pt-0.5 (0.188 wt% Pt) demonstrates an unprecedentedly high H 2 evolution rate of 20.88 mmol h −1 g −1 with excellent photocatalytic stability, which is 87 times than that of NYTiO 2 -Pt-3.0 (0.24 mmol h −1 g −1 , 1.88 wt% Pt), and also much higher than those of other TiO 2 nanostructures with the same Pt content. Such H 2 evolution rate is the highest reported for photocatalytic H 2 production with such a low Pt content under simulated solar light. Our strategy here suggests that via alkali modifying the photocatalysts , we can not only enhance the H 2 production for solar energy conversion but also significantly decrease the noble metal content for cost saving.
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CHINESE CHEMICAL LETTERS
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2017
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IF 1.932
Lin Liu,Xiang-Mei Yu,Bao Zhang,Shu-Xian Meng,Ya-Qing Feng
The performance of dye-sensitized solar cells (DSSCs) consisting of anatase TiO 2 nanoparticles that were synthesized via a hydrothermal method was studied. The synthesized TiO 2 nanoparticles were characterized by X-ray diffraction (XRD), nitrogen sorption analysis, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and UV–vis spectroscopy. Then the J - V curve, electrochemical impedance spectroscopy (EIS), and open-circuit voltage decay (OCVD) measurement were applied to evaluate the photovoltaic performance of DSSCs. Compared with the commercial TiO 2 nanoparticles (P25), the synthesized-TiO 2 nanoparticles showed better performance. By adding diethylene glycol (DEG) before the hydrothermal process, the synthesized TiO 2 nanoparticles (hereafter referred to as TiO 2 -DEG particles) shows narrower size distribution, larger specific surface area, higher crystallinity, and less surface defects than TiO 2 (DEG free) particles. The analysis of photovoltaic properties of DSSCs based on TiO 2 -DEG particles showed that the recombination of electron-hole pairs was decreased and the trapping of carries in grain boundaries restrained. It was believed that the photoelectrode fabricated with the as-prepared TiO 2 nanoparticles improved the loading amount of dye sensitizers (N719), and enhanced the photocurrent of the DSSCs. As a result, the TiO 2 -DEG particle based cells achieved a photo-to-electricity conversion efficiency ( η ) of 7.90%, which is higher than 7.53% for the cell based on TiO2 (DEG free) and 6.59% for the one fabricated with P25.
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RSC Advances
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2017
·Vol. 7
·期 25
·14959-14965
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IF 3.108
Xinxin Yu,Ranran Cai,Yuqing Song,Qiang Gao,Nan Pan,Mingzai Wu,Xiaoping Wang
During the past decades, researchers have made great efforts towards an ideal surface enhanced Raman spectroscopy (SERS) substrate. Here a smart SERS-active flexible substrate was designed and its performance was studied. The substrate is constructed from graphene and TiO2, and could be divided into two functional layers. Graphene provides a flat hot surface for Raman enhancement, which could be ascribed to chemical enhancement. The TiO2 layer is an effective photocatalyst, which could induce photocatalytic decomposition of adsorbed molecules under UV irradiation. Notably, the substrate was realized by a one-step transfer method, followed by annealing. In the synthesis process, a flexible TiO2 layer was produced by spin-coating on the CVD graphene and was used as a support in the transfer process of graphene instead of PMMA, which could exclude contamination and avoid degradation of the Raman enhancement performance. Combining detection with degradation of trace amounts of analyte, the versatility of the SERS substrate is greatly enhanced and could be adapted to fit a wide range of sensing and photocatalytic applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Linping Tian,Yingxuan Feng,Xinjie Chen,Hanwei Wang,Jian Lin,Weichen Shi,Lin Wei,Wenjie Xia,Qingfeng Sun,Yushan Yang,Yingying Li
Immobilization of nanometer-scale photocatalysts on a 3D polymeric substrate could play several complementary roles in photocatalysis, such as providing mechanical stability, facilitating easy recycling after usage, enhancing adsorption capability, and improving light harvesting properties through multiple reflections. To achieve stable and efficient photocatalysis under weak light conditions, 3D cellulose micro-rolls were introduced into the photocatalytic composites. Here, the formation of micro-rolls is attributed to the presence of titania nanoparticles, which generate uneven shrinkage stress in cellulose during the freeze-drying process, thereby inducing the cellulose to curl up. The dramatic structural transformation of the 3D micro-rolls increased the Brunauer-Emmett-Teller (BET) surface area of the sample. The 3D micro-roll structure is more favorable for photocatalysis due to its efficient mass transfer and exposed reactive sites, laying the foundation for enhanced adsorption capacity and photocatalytic reactions. The adsorption experiments suggested that the inner space of the micro-rolls provides a sufficient reaction zone, enabling fast mass transfer of molecules and easy access to the active sites. The samples could stand a high strain of 80 % and retain 96 % of the original maximum stress after 200 cyclic compressions, indicating excellent long-term stability. In addition, the photocatalytic tests show that with the help of micro-rolls, TiO 2 can convert and utilize weak light that would otherwise be unused, and the catalysate exhibits almost no toxicity towards Escherichia coli .
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zihan Tian,Shuhao Qin,Jingkui Yang,Xiao Wu,Jing Zhang,Jianxin Li,Hong Wang,Zhenyu Cui
PVDF/TiO 2 @CQDs hybrid photocatalytic thin films were prepared by ink-jet printing. The printing ink was prepared with the TiO 2 , TiO 2 (s)@CQDs (surface composite), and TiO 2 (i)@CQDs (situ doping) nanoparticles as precursors, respectively. Compared to TiO 2 (s)@CQDs, TiO 2 (i)@CQDs has a smaller particle size (about 10.01 nm) and a narrower particle size distribution (6∼14 nm), which can improve the photocatalytic effect while avoiding nozzle clogging. The PVDF/TiO 2 (i)@CQDs hybrid film exhibited a high degradation efficiency ( η ) of 93.71 % for Rhodamine B (RhB) within 150 min under visible light with a catalyst load of only 0.49 wt%. The reaction rate constant ( ks ) of the PVDF/TiO 2 (i)@CQDs film was about 4.3 times higher than that of the PVDF/TiO 2 (s)@CQDs film. The small particle size of this S-scheme TiO 2 (i)@CQDs heterostructure nanoparticle and the more effective contact interface formed between TiO 2 and carbon quantum dots (CQDs) further facilitated electron transfer and enhanced photoactivity. The firmly immobilized catalysts on the Polyvinylidene fluoride (PVDF) film substrate through Ti-F coordination bonds ensured the reusability and stability of the photocatalytic film (the η of RhB still reached 88.05 % after 10 consecutive cycles). This work provides a new strategy for the application of ink-jet printing technology in photocatalysis.
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ACS ES&T Water
·
2024
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IF 4.8
Yu Wei,Meng Chen,Sheng Guo,Yao Li,Zhenyu Zhang,Yin Xie,Chao Cai,Qingsong Wei
Hierarchically porous photocatalysts exhibit superior light-harvesting capacity and enhanced photocatalytic activity. In this work, a facile method by combining additive manufacturing (AM) and dealloying was employed to prepare a hierarchically porous photocatalyst, namely, nanoporous-TiO2-encapsulating macroporous-double-gyroid-structure photocatalyst (TiO2@DGS). It was found that TiO2@DGS possessed deterministic macropores and interconnected nanopores, which offered efficient mass transfer channels and abundant active sites, respectively. Thus, TiO2@DGS showed excellent photocatalytic capability under ultraviolet–visible (UV–vis) light irradiation and achieved a tetracycline degradation efficiency of over 90% within 60 min (photocatalytic rate constant k = 4.0 × 10–2 min–1). Furthermore, TiO2@DGS exhibited excellent durability and reusability due to its stable three-dimensional structures. This work not only exemplifies the high performance of the prepared TiO2@DGS for environmental remediation but also provides an innovative approach to introduce tailored macrostructures into hierarchically porous photocatalysts through the incorporation of AM and dealloying.
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