CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xiao Wang,Asad Mahmood,Guanhong Lu,Xiaofeng Xie,Jing Sun
The photocatalytic oxidation (PCO) mechanisms of single aromatic hydrocarbons/NO x gases and the synergistic photocatalytic treatment of their mixtures over TiO 2 (anatase) are proposed by analyzing the evolution of adsorbed and gas-phase intermediates through in-situ FTIR and mass-spectroscopy. Photo-activated surface lattice oxygen of TiO 2 (TiO 2 (·O L )) is found to be a strong oxidant for the PCO of both o-xylene and NO x and their consumption led to the deactivation of photocatalysts. As an important coexist air pollutant, NO is firstly discovered as a helper for the persistent ring-opening and degradation of aromatics including o-xylene, toluene, styrene and benzene. NO 2 , a PCO intermediate of NO, acts as a powerful oxidant for replenishing lattice oxygen of TiO 2 , which guarantees the continuous generation of active TiO 2 (·O L ) and prevents the deactivation of photocatalyst. With the introduction of NO, the PCO efficiency of o-xylene increases from ∼65% to 100% and no performance decay of TiO 2 happens in 6 h. The existence of aromatics prevents the escape of toxic NO 2 into air and promotes the harmless transformation of NO into nitrite/nitrate ions and N 2 . This work outlines the essential role of activation and replenishment of lattice oxygen in the PCO process by analyzing the synergistic and stable photocatalytic treatment of aromatic hydrocarbon/NO x mixtures, which explores the practical potentiality of photocatalysis in air purification.
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高影响因子
Food Analytical Methods
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2022
·Vol. 15
·期 10
·2830-2839
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IF 3.498
Tang Jing,Li Jie,Liu Tianna,Tang Wenjing,Li Nali,Zheng Shengbiao,Guo Jiahao,Song Changchun
Electrochemical determination of tert-butylhydroquinone (TBHQ) is vital to food safety due to negative health effects; however, bare electrode of traditional electrochemical sensors generally has a narrow linear range and low sensitivity, limiting their practical application. Accordingly, the nano-architecture fabricated with N-doped TiO 2 –carbon nano-composites (TiO 2 /NC) is prepared by the thermolysis of NH 2 functionalized MIL-125(Ti) metal–organic frameworks (NH 2 -MIL-125(Ti)). TiO 2 /NC composites are firstly developed as the electrochemical material for electrochemical determination of TBHQ. The TiO 2 /NC composites with a highly porous structure, excellent conductivity and electron transportation, and large surface area show remarkable electrochemical oxidation ability for TBHQ. Under optimal conditions, TiO 2 /NC composite-modified electrode presents a broader linear response to TBHQ concentration of 0.05–100 μM with the detection limit as low as 4 nM (S/N = 3). Finally, the sensor platform is implemented directly to determine TBHQ in edible oil for evaluation of its practical application. TiO 2 /NC composites sensor fabricated perform larger linear range with high sensitivity and anti-interference properties, which can be used as a potential for electrochemical determination of TBHQ.
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Sustainability
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2022
·Vol. 14
·期 17
·10614
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IF 3.889
Anqi Wang,Wei Chen,Nannan Geng,Xiaomeng Lan,Mingxiang Liu,Xing Wu
Industrialization and urbanization have resulted in large volumes of municipal wastewater containing abundant refractory humic acid (HA), which is difficult to biodegrade with carcinogenic byproducts and has posed a great threat to human health. Photocatalysis is a promising advanced oxidation process (AOP) for the efficient degradation of HA. In this work, a novel three-step electrochemical method was employed to fabricate electrochemically converted N-doped TiO2nanotubes/graphene (ENTG) composite film. Compared with traditional hydrothermally synthesized N-doped TiO2/graphene (NTG) nanoparticles, the ENTG photocatalyst exhibited enhanced degradation performance, recyclability and stability. It was found that ETNG can extend the range of light absorption to over 400 nm and narrow the band gap to 2.7 eV. The degradation rate for HA was up to 92.3% under the optimum condition. The preparation mechanism for ENTG is based on an electrochemical reduction–deposition hypothesis, while the degradation mechanism is dependent on adsorption and free radical oxidation. According to a free radical quenching test, both •OH and •O2−radicals were produced, and •OH played the dominant role in HA degradation. In general, ENTG is a promising photocatalyst for further application in municipal wastewater treatment.Keywords:electrochemically fabricated;N-doped TiO2/graphene;photocatalytic degradation;humic acid;municipal wastewater treatment
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高影响因子
ACS Applied Nano Materials
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2022
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IF 6.14
Yifan Yu,Lu Ma,Linling Qin,Wenxiang Lu,Cheng Zhang,Shaolong Wu,Xiaofeng Li
Photoelectrochemical (PEC) biosensors show great potential in biochemical molecular detection due to the advantages of low background noise, high sensitivity, and easy integration. However, the current PEC glucose biosensors are subject to the deficiencies of the relatively large limit of detection, small detectable range of concentration, and requirement of an operation voltage. Herein, we construct an unbiased glucose biosensor both in three- and two-electrode configurations using a glucose oxidase (GOx)-modified Schottky junction comprised of Au nanoparticle (NP)-decorated TiO2-coated Al films. A wide detectable range of concentration (0.3–104 μM) is achieved at relatively zero bias versus the reference electrode in a three-electrode configuration under AM 1.5G illumination along with a fitted sensitivity of 3780 μA mM–1 cm–2 (in the concentration range of 0.3–1.0 μM) and a limit of detection down to 0.05 μM. The photocurrents corresponding to typical interfering substances (e.g., uric acid and ascorbic acid) are less than 10% of that to glucose. Moreover, the constructed sensor achieves almost no attenuation in photocurrent under light ON/OFF circular irradiation for 30 min and shows a photocurrent around 92% of the initial value after 30-day storage in air at room temperature. The satisfactory sensing performance is ascribed to the following three aspects: (1) the optical absorption is enhanced due to the formation of a plane-parallel resonance cavity and the reduced band gap of the TiO2 material, (2) the separation and extraction of the photogenerated carriers are facilitated due to the Al doping and the embedded Schottky junction, and (3) the carrier transfer from the photoelectrode surfaces into the electrolyte is boosted because of the Au NPs and nanostructured GOx decoration. This work provides an alternative route to prepare high-performance and self-powered glucose sensors for diabetes diagnosis.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Rui Yu,Yanling Yang,Zhiwei Zhou,Xing Li,Jingfeng Gao,Nan Wang,Jiaqi Li,Yongwang Liu
In this work, a novel ternary heterojunction composite with bismuth oxide (Bi 2 O 3 ), titanium dioxide (TiO 2 ) and reduced graphene oxide (rGO) was produced via a one-step hydrothermal process. The prepared Bi 2 O 3 /rGO/TiO 2 (BRGT) composite possessed a strong visible-light responsiveness and a high separation efficiency of photogenerated carriers, with a specific surface area of 133.1 m 2 /g. The optimal degradation performance towards tetracycline (94.3% removal) was obtained by BRGT-10 with Bi/Ti molar ratio of 10% and mass ratio of graphene oxide/Ti of 5% following conditions of 0.1 g/L BRGT-10 at pH of 6.7. The degradation rate of tetracycline by BRGT was 4.5, 3.8, 1.4, and 1.28 times that of TiO 2 , TiO 2 /rGO, Bi 2 O 3 /TiO 2 , and Bi 2 O 3 /TiO 2 @rGO, respectively. O 2 − radicals and holes play the dominant roles in the photodegradation of tetracycline. Based on density function theory calculation and liquid chromatography-mass spectrometry identification of intermediates, the degradation pathways of tetracycline were mostly attributed to the breakage of carbon-carbon double bonds, nitrogen-carbon bonds and rearrangement of hydroxyl groups, and the decreased toxicity of the formed intermediates was evaluated. The BRGT-10 composite owned optimal reusability and applicability. This study explores a facile synthesis process of ternary heterojunction composite and provides insights into photodegradation mechanism of refractory organics from water under visible-light.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Mingtai Hou,Zeyi Jiang,Fuqiang Chu,Xinru Zhang,Nien-Chu Lai
Organic phase change materials (PCMs) promise remarkable latent heat storage capacity but suffer from weak visible-light absorption capability and ultralow thermal conductivity for harvesting and conversion of clean solar energy. Herein, we design and synthesize a new core@shell structured n-eicosane@TiO 2 /TiN composite microcapsules which can realize 98.08 % of thermal energy storage capacity. By making use of the localized surface plasmon resonance of high-thermal-conductivity TiN , the prepared composite microcapsules possess a remarkable photo-thermal conversion efficiency up to 78.4 %. Plasmonics TiN can not only efficiently adsorb visible light and convert the optical energy into heat but also enhance thermal conductivity of the composite microcapsules, resulting in ultra-low supercooling degree of 1.02 o C. In addition, the composite microcapsules exhibit excellent phase change reversibility and thermal durability during the 100-cyclic scans. Our work offers new insights into designing high-performance microcapsuled PCMs in solar thermal applications, bringing great potential for renewable energy utilization beyond traditional fossil energy sources.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Ming Xiao,Ruixue Li,Jinglin Yin,Junhui Yang,Xinyu Hu,Hongbo Xiao,Wenlei Wang,Ting Yang
The treatment of arsenite pollution in water has always been concerned. Oxidation of high toxic As(III) to relatively low toxic As(V) by efficient photocatalytic oxidation technology is a research hotspot. This paper is focused on the active photocatalyst of TiO 2 @Fe 3 O 4 composites synthesized by a simple hydrothermal method for the efficient photocatalytic oxidation of As(Ⅲ). The successful construction of Ti–O–Fe interface bonds between TiO 2 and Fe 3 O 4 significantly promoted the transfer efficiency of photo-generated carriers, and further rapidly improved the photocatalytic oxidation efficiency of As(Ⅲ). The application results showed that the constructed TiO 2 @Fe 3 O 4 photocatalyst with 0.10 g Fe 3 O 4 (TF-0.10) could complete the transformation from As(Ⅲ) (10,000 μg/L) to As(Ⅴ) within 4 min with a high oxidation ratio of 100% and maintained the good properties with unchanged crystal structure after five cycles. Furthermore, the photocatalytic properties of TiO 2 @Fe 3 O 4 composites were still stable under different pH values. Electron paramagnetic resonance (EPR) consequence displayed that the superoxide radical (‧O 2 — ) and hole (h + ) were the main intermediate product in the arsenic photocatalytic oxidation system, and hydroxyl radical (‧OH) had little effect on this oxidation system. The possible mechanism of As(Ⅲ) photocatalytic conversion was further explored based on the results of the data analysis. Furthermore, this work provides a potential new idea for the practicability of efficient photocatalytic arsenic oxidation.
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JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Changkun Ding,Xiwen Qin,Yingying Tian,Bowen Cheng
We herein report novel polyethersulfone/graphene oxide@titanium dioxide (PES/GO@TiO 2 ) photocatalytic membranes developed via the layer-by-layer (LBL) self-assembly technique. The synergistic coupling of GO and TiO 2 could result in improved photocatalytic activity and endow the pristine PES membrane with photocatalytic function. Various techniques were adopted to characterize the structure and morphology of PES/GO@TiO 2 photocatalytic membranes, which indicated that GO@TiO 2 was successfully integrated in PES. Contact angle testing proved that the hydrophilicity of PES/GO@TiO 2 photocatalytic membranes was improved with the increase of self-assembled GO@TiO 2 layers. FTIR results indicated that GO@TiO 2 was attached to the pristine PES membrane surface through interfacial interactions in our experimental conditions. And both the thermal stability and mechanical stability of the pristine PES membrane were improved with the incorporation of GO@TiO 2 . Meanwhile, the optimized PES/GO@TiO 2 photocatalytic membranes exhibited a water flux up to 109.8 L/(m 2 h), more than 4 times that of pristine PES membrane, while kept high bovine serum albumin (BSA) rejection of 99.1%, and flux recovery ratio (FRR) of 86.1% in dark condition and the flux almost tripled after about 3 h of UV irradiation. Specially, the photocatalytic activity of PES/GO@TiO 2 photocatalytic membranes increased with an increase of self-assembled GO@TiO 2 layers. When the self-assembled layers of GO@TiO 2 were three, the membrane showed 95.1% of degradation against methylene blue (MB) dye under UV light irradiation. Thus, the prepared PES/GO@TiO 2 photocatalytic membranes can be suggested as an ideal candidate for photocatalytic templates in wastewater treatment .
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APPLIED THERMAL ENGINEERING
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2022
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IF 6.465
Zhenghao Jin,Shuhong Li,Runfa Zhou,Mengkai Xu,Weixue Jiang,Kai Du
Adding nanoparticles can enhance the mass and heat transfer of basic fluid, improving the coefficient of performance(COP) of the absorption refrigeration system(ARS). However, there are few experimental studies on the effects of absorption pressure and temperature on the absorption performance of nanofluid in an actual ARS. Therefore, the TiO 2 nanoparticles are added to the NH 3 - H 2 O – LiBr working fluid. The difference in ammonia mass fraction between the inlet and outlet solution of the absorber (Δ ε ' a ) is compared with when the solution is absorbed saturated (Δ ε a ). The results indicate that the Δ ε ' a and system COP increase when the absorption temperature decreases, the absorption pressure increases, or the TiO 2 mass fraction increases. The ratio Δ ε ' a /Δ ε a is used to evaluate the absorption efficiency of the nanofluid. The positive effects of nanofluid on the absorption efficiency and COP slightly increase when absorption temperature increases, but decrease when the absorption pressure is greater than 0.31 MPa. For all of our test groups, the greatest improvement in absorption efficiency is 85 %, and the largest improvement in COP is 13.7 %.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Qingyi Wei,Qirong Dong,Da-Wen Sun,Hongbin Pu
Surface-enhanced Raman spectroscopy (SERS) substrates based on metal/semiconductors have attracted much attention due to their excellent photocatalytic activity and SERS performance. However, they generally exhibit low light utilization and photocatalytic efficiencies. Herein, molybdenum disulfide coated titanium dioxide modified with gold nanoparticles (MoS 2 @TiO 2 @Au) as a heterojunction-based recyclable SERS platform was fabricated for the efficient determination of fungicides. Results showed that the MoS 2 @TiO 2 @Au platform could rapidly degrade 90.7% crystal violet in 120 min under solar light irradiation and enable reproducible and sensitive SERS analysis of three fungicides (methylene blue, malachite green, and crystal violet) and in-situ monitor of the photodegradation process. The platform could also be reused five times due to the unique integrated merits of the MoS 2 @TiO 2 @Au heterojunction. Meanwhile, experiments in determining methylene blue in prawn protein solution achieved a limit of detection of 1.509 μg/L. Therefore, it is hoped that this work could expand detection applications of photocatalytic materials.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Tao Ke,Shuyi Shen,Kun Yang,Daohui Lin
Developing visible-light-driven photocatalysts with high charge separation and transfer efficiency to degrade organic pollutants in wastewater remains a major issue. In this work, quaternary Bi 2 O 3 /C 3 N 4 /TiO 2 @C (BCTC) hybrids were successfully fabricated by hydrothermal and calcination two-step method using Bi(NO 3 ) 3 ·5H 2 O, C 3 N 4 , and Ti 3 C 2 as precursors. The optimized BCTC hybrids with the dosage of 1 g L −1 (BCTC-2%) exhibited high photocatalytic activity, degrading 100% sulfamethoxazole (SMZ, 5 mg L −1 ) within 100 min under visible light irradiation. Moreover, the photocatalytic degradation rate of SMZ by the quaternary junction was found to be 5.12-, 2.87-, and 1.35-fold higher as compared with Bi 2 O 3 /C 3 N 4 , C 3 N 4 /TiO 2 @C, and Bi 2 O 3 /TiO 2 @C junctions, respectively. The enhanced photocatalytic performance of BCTC hybrids could be attributed to the formation of a double Z-scheme photocatalytic system and the photosensitization of Bi 2 O 3 and C 3 N 4 . The photogenerated hole (h + ) was the primary reactive species that degraded SMZ. The plausible intermediates during the photocatalytic degradation of SMZ were identified by high-performance liquid chromatography quadrupole time-of-flight tandem mass spectrometry and the degradation pathway was postulated. Importantly, BCTC-2% had a good photocatalytic activity for degrading SMZ in natural water samples, indicating the high potential of BCTC hybrids for wastewater treatment applications.
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Jingwei Gong,Yanzhu Guo,Jie Lu,Yi Cheng,Haisong Wang
Carbon quantum dots/titanium dioxide (CQDs/TiO 2 ) nanocomposites were synthesized with TEMPO oxidized cellulose as carbon source via a facile method. In this eco-friendly system, the photocatalytic activity of CQDs/TiO 2 were evaluated through photo-degradation of methylene blue (MB) under visible light. The results show that CQDs/TiO 2 composites possess high photocatalytic degradation efficiency up to 92%. The enhanced degradation efficiency of MB was probably attributed to that the photoelectrical properties of CQDs can lead to effective separation of photo-generated electrons-holes pairs. Moreover, the TEMPO oxidized cellulose has abundant amino groups, which can significantly improve the photophysical properties of CQDs.
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