ANALYTICAL CHEMISTRY
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2013
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IF 5.695
Shao-Ting Wang,Wei Huang,Wei Lu,Bi-Feng Yuan,Yu-Qi Feng
A novel TiO2-based SPE strategy was developed for eliminating normal ribonucleosides before mass spectrometry (MS) analysis of 2′-deoxynucleosides and 2′-O-modified ribonucleosides. The chromatographic research for the retention behavior of ribonucleosides and 2′-deoxynucleosides on TiO2 materials was investigated using TiO2 separation column. The results indicated a specific affinity interaction mechanism between TiO2 and cis-diol-containing ribonucleosides, and the interaction was proved effective even under a wide range of pH conditions and salt concentrations. Benefiting from these features, a TiO2-based solid phase extraction (SPE) method was developed for highly efficient elimination of RNA contamination from genomic DNA. Compared with the widely used enzymatic digestion method, the proposed TiO2-based SPE method showed much more efficiency for the removal of RNA as well as provided high recoveries for the 2′-deoxynucleosides. In addition, the sample processing time is dramatically shortened using the TiO2-based SPE method (∼5 min) compared to the traditional enzymatic digestion method (∼12 h). Finally, the purification of 2′-O-methylated ribonucleosides from RNA was successfully achieved in HeLa cells by the TiO2-based SPE method, which provided a proof-of-concept for the purification of relevant modified ribonucleosides from bulky normal ribonucleosides. Taken together, this strategy developed in the current study offers a promising option to purify 2′-deoxynucleosides/2′-O-modified ribonucleosides for their sensitive and accurate determination by eliminating normal ribonucleosides in biological samples.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Yang Wang,Xiaoqing He,Peng Gao,Li Feng,Liqiu Zhang
Limited utilization of photogenerated charge carriers in titanium dioxide under visible light have hinder its application development. To address this challenge, a novel N-doped carbon quantum dots (N-CQDs) and oxygen vacancies (OVs) synergistically decorated on TiO 2 (P25) was synthesized through a facile one-step hydrothermal method. Under visible light irradiation, the first order reaction rate constants of formaldehyde (HCHO) photocatalytic oxidation by OVs-TiO 2 and N-CQDs/OVs-TiO 2 was significantly higher than that of pristine P25, with 10.1 and 16.7 folds increase, respectively. Characterization results confirmed the generation of OVs on the surface of N-CQDs/TiO 2 composite. The optical and electrochemical experiments suggested the electron capture center effect of OVs and the properties of N-CQDs in unique up-converted photoluminescence , efficient charge separation, as well as significant adsorption in visible light region. In addition, the work function also clarified that photoelectrons could transfer from N-CQDs to OVs-TiO 2 . Furthermore, different relative humidity and electron paramagnetic resonance (EPR) experiments demonstrated that the hydroxyl radical (•OH) was the dominant reactive radical in HCHO photodegradation . The •O 2 − could also enhance the photodegradation efficiency of HCHO. This work provides an in-depth understanding on the complementary roles of N-CQDs and OVs and is helpful for designing metallic oxide photocatalysts for volatile organic compounds removal.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
·
IF 8
Bo Zhao,Guojing Yang,Zhouyun Xie,Ni Zhang,Jingfen Xia,Xuran Liu,Dongbo Wang,Peier Wang,Li Tang
Intimately coupled photocatalysis and biodegradation (ICPB) system is a potential wastewater treatment technology, of which TiO 2 -based ICPB system has been widely studied. There are many ways to improve the degradation efficiency of the ICPB process, but no crystal facet engineering method has been reported yet. In this work, a new ICPB system coated with NaF–TiO 2 exposing high energy facets was designed to degrade biorecalcitrant psychotropic drug - venlafaxine (VNF). Initially, the TiO 2 crystal surface was modified with NaF, resulting in the formation of NaF–TiO 2 with a 14.4% increase in the exposure ratio of (001). The contribution rate of ·OH was increased by 9.5%, and the contribution rate of h + was increased by 33.2%. Next, NaF–TiO 2 was loaded onto the surface of the sponge carrier, and then the ICPB system was constructed after about 15 days of biofilm formation. After the ICPB system was acclimated with VNF, the removal rate of COD decreased significantly (the lowest was 62.7%), but that of ammonia nitrogen remained at 50.5 ± 6.0% and the extracellular polymeric substance (EPS) secretion increased by 84.1 mg/g VSS. According to the high throughput results, at the phylum level, Proteobacteria and Chloroflexi together maintain the nitrogen removal capability and structural stability of the ICPB system. The relative abundance of Bacteroidota was significantly increased by 14.2%, suggesting that there may be some correlation between Bacteroidota and certain metabolites of the anti-depressant active ingredients. At the genus level, the Thauera (3.1%∼11.5%) is the major bacterial group that secretes EPS, protecting biofilm against external influences. Most of the changes in microorganisms are consistent with the decontamination properties and macroscopic appearance of EPS in the ICPB system. Finally, the degradation efficiency of ICPB system for VNF was investigated (92.7 ± 3.8%) and it was mostly through hydroxylation and demethylation pathways, with more small molecular products detected, providing the basis for biological assimilation of VNF. Collectively, the NaF–TiO 2 based ICPB system would be lucrative for the future degradation of venlafaxine.
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ENERGY & FUELS
·
2024
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IF 5.2
Huanjin Jiang,Jie Yang,Shangzhen Feng,Hantao Zhou,Jixiang Chen
Ni3Sn2/TiO2, Ni3Sn2/TiO2–ZrO2(x:y) (x:y indicates the Ti/Zr atomic ratio), and Ni3Sn2/ZrO2 catalysts were prepared by the sol–gel method and tested for in situ hydrodeoxygenation of methyl palmitate with methanol as the hydrogen donor. The Ni3Sn2 intermetallic compound (IMC) is formed in all of the catalysts. The Ti–O–Zr bonds are generated in the TiO2–ZrO2 mixed oxide, leading to more Lewis acid sites on Ni3Sn2/TiO2–ZrO2(x:y) than those on Ni3Sn2/TiO2 and Ni3Sn2/ZrO2, and Lewis acid sites may contribute to the C–O bond cleavage. Especially, among the as-prepared catalysts, Ni3Sn2/TiO2–ZrO2(2:1) has the largest specific surface area and the smallest Ni3Sn2 particles, subsequently giving rise to the highest activity for in situ hydrodeoxygenation. The decarbonylation pathway dominates on all of the supported Ni3Sn2 IMC catalysts. At 330 °C, the yield of n-pentadecane on Ni3Sn2/TiO2–ZrO2(2:1) reaches 91.2%. Ni3Sn2/TiO2–ZrO2(2:1) shows slight deactivation after reaction for five times, mainly due to carbon deposition and the slight sintering of Ni3Sn2 IMC particles.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Songshan Zhu,Shimin Ma,Di Song,Yunzhu Wang,Jichang Lu,Tianhao Ai,Huihui Lu,Sufang He,Yongming Luo
The dynamic relationship of TiO 2 crystal phase and strong metal-support interactions (SMSI) of Ni/TiO 2 catalyst was investigated to reveal the induction period of glycerol steam reforming. Comprehensive investigations confirmed that the SMSI between Ni 0 and anatase TiO 2 was formed by anatase TiO 2 encapsulated Ni 0 after H 2 reduction at 500 °C for the Ni/TiO 2 catalyst calcined at 500 °C (Ni/Ti-500R), which inhibited the contact of Ni 0 active sites with reactants and led to the low hydrogen yield in the initial stage of the reaction. Interestingly, the dynamic conversion of anatase to rutile during the GSR process at 600 °C caused the TiO 2 overlayers on the Ni 0 particles to gradually fade, exposing more Ni 0 sites, resulting in a gradual increase in hydrogen yield to 5.93 mol H2 /mol glycerol . In addition, Ni/Ti-500R with a dynamic SMSI inhibited Ni 0 particles sintering and encapsulated carbon deposition, resulting in relatively better stability (21 h) after induction period. In comparison, the designed Ni/TiO 2 catalyst calcined at 600 °C (Ni/Ti-600R) with rutile TiO 2 as the main component inhibited the formation of the classical SMSI, even after 600 °C H 2 reduction, and no excessive TiO 2 encapsulated Ni 0 particles were observed, so no obvious induction period occurred. This study provides new insights into the relationship of SMSI with crystal phases and the induction period in multiphase catalysis, also a new strategy for designing efficient catalysts.
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Advanced Science
·
2021
·Vol. 8
·期 10
·2004662
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IF 16.806
Wanpei Hu,Zhiling Wen,Xin Yu,Peisen Qian,Weitao Lian,Xingcheng Li,Yanbo Shang,Xiaojun Wu,Tao Chen,Yalin Lu,Mingtai Wang,Shangfeng Yang
Low-temperature solution-processed TiO 2 nanocrystals (LT-TiO 2 ) have been extensively applied as electron transport layer (ETL) of perovskite solar cells (PSCs). However, the low electron mobility, high density of electronic trap states, and considerable photocatalytic activity of TiO 2 result in undesirable charge recombination at the ETL/perovskite interface and notorious instability of PSCs under ultraviolet (UV) light. Herein, LT-TiO 2 nanocrystals are in situ fluorinated via a simple nonhydrolytic method, affording formation of Ti─F bonds, and consequently increase electron mobility, decrease density of electronic trap states, and inhibit photocatalytic activity. Upon applying fluorinated TiO 2 nanocrystals (F-TiO 2 ) as ETL, regular-structure planar heterojunction PSC (PHJ-PSC) achieves a champion power conversion efficiency (PCE) of 22.68%, which is among the highest PCEs for PHJ-PSCs based on LT-TiO 2 ETLs. Flexible PHJ-PSC devices based on F-TiO 2 ETL exhibit the best PCE of 18.26%, which is the highest value for TiO 2 -based flexible devices. The bonded F atoms on the surface of TiO 2 promote the formation of Pb─F bonds and hydrogen bonds between F − and FA/MA organic cations, reinforcing interface binding of perovskite layer with TiO 2 ETL. This contributes to effective passivation of the surface trap states of perovskite film, resulting in enhancements of device efficiency and stability especially under UV light.
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JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Qihui Ding,Qi Zhang,Binbin Li,Ding Cai,Wei Wu
For rechargeable Zn air batteries (ZABs), the low cost and scalable preparation method for the catalyst with favorable bifunctional oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) catalytic properties is a critical influence factor for its large-scale application. In this paper, the composites (preTiO 2 @hG) consisting of the precursor of titanium dioxide and hydrophilic graphene were successfully prepared in a Rotating Packed Bed by high-gravity technology. Then, N and Co elements were doped by hydrothermal-reduction method to obtain composite catalyst CoO-TiO 2 @NG, which had excellent catalytic performances of both OER/ORR. The value of ΔE is 0.685 V for CoO-TiO 2 @NG. When used as the catalyst on the air cathode of rechargeable ZABs, the device exhibits a high power density of 146.8 mW/cm 2 and a large specific capacity of 815.8 mAh/g. It also has good cycle stability, the ZAB capacity using CoO-TiO 2 @NG as catalyst does not significantly decrease after more than 110 h of charging-discharging cycles. The improvement of OER and ORR catalytic performance of CoO-TiO 2 @NG is due to the synergistic effect of CoO, TiO 2 and N-doped graphene. This article provides a new method for low-cost and scalable preparation of bifunctional OER/ORR non-precious metal catalysts with novel component and high performances.
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AQUATIC TOXICOLOGY
·
2024
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IF 4.1
Haiyue Chen,Yingjia Wang,Hongwu Liang
Dibutyl phthalate (DBP) is a commonly used plasticizer that is frequently detected in water samples due to its widespread use. Titanium dioxide nanoparticles (n-TiO 2 ) have been found to enhance the harmful effects of organic contaminants by increasing their bioavailability in aquatic environments. However, the combined toxic effects of DBP and n-TiO 2 on aquatic organisms remain unclear. This study aimed to investigate the neurotoxicity of DBP and n-TiO 2 synergistic exposure during the early life stage of zebrafish. The results of the study revealed that co-exposure of DBP and n-TiO 2 led to an increase in deformities and a significant reduction in the active duration of zebrafish larvae. Furthermore, the co-exposure of DBP and n-TiO 2 resulted in elevated levels of oxidative stress and altered gene expression related to neurodevelopment and apoptosis. Notably, n-TiO 2 exacerbated the oxidative damage and apoptosis induced by DBP alone exposure. Additionally, co-exposure of the 1.0 mg/L DBP and n-TiO 2 significantly affected the expression of genes associated with neurodevelopment. Moreover, disturbances in amino acid metabolism and interference with lipid metabolism were observed as a result of DBP and n-TiO 2 co-exposure. In general, n-TiO 2 aggravated the neurotoxicity of DBP in the early life stage of zebrafish by increasing oxidative stress, apoptosis, and disrupting amino acid synthesis and lipid metabolism. Therefore, it is essential to consider the potential risks caused by DBP and nanomaterials co-existence in the aquatic environment.
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ACS Catalysis
·
2025
·
IF 13.1
Kaijie Han,Song Song,Yong You,Xiaoqia Fu,Xingang Li
Ru-based catalysts are widely used for the reductive amination of carbonyl compounds. However, challenges remain, particularly in achieving high catalytic activity under mild conditions. In this study, we report a strategy to simultaneously modulate the electron density of Ru0 and the RuOx/Ru0 ratio by systematically adjusting the calcination temperature. The catalyst calcined at 200 °C demonstrated remarkable performance, achieving a 97.8% yield of furfurylamine at 30 °C, significantly outperforming most previously reported catalysts. Furthermore, it showed compatibility with a range of carbonyl compounds. At 200 °C calcination, the reduced electron density of Ru0 weakened its electron-donating ability, thereby facilitating H2 activation. Meanwhile, this treatment yielded the highest RuOx content and thereby generated the greatest Lewis acid site density, enhancing the adsorption and activation of NH3, furfural, and the Schiff base. Mechanistic studies reveal that the synergistic effect between electron-deficient Ru0 and Lewis acid sites significantly reduced the apparent activation energy for the ammonolysis of Schiff base intermediates, the rate-determining step in reductive amination. This work provides an effective strategy for tuning both the electronic structure of the metal and the acid properties of the catalyst, highlighting the crucial role of metal-acid synergy in promoting Schiff base ammonolysis during reductive amination.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Mengyao Hua,Siyi Wang,Meng Cheng,Guangming Liang,Yafen Zhou,Lei Xu,Guofang Zhang
Photocatalysts UiO-66-(OH) 2 /MnO 2 -TiO 2 with intimate contact interfaces were successfully synthesized by impregnation methods and all of the composites were characterized by a variety of analytical techniques. The results indicated that MnO 2 and TiO 2 form a heterojunction and tightly attached to the surface of UiO-66-(OH) 2 , the generation of MnO 2 -TiO 2 heterojunction improved the catalyst electron-hole separation efficiency, and there was a strong electronic interaction between MnO 2 -TiO 2 and UiO-66-(OH) 2 in the composite. The synergistic combination of high adsorption capacity of UiO-66-(OH) 2 , and efficient interfacial charge transfer between UiO-66-(OH) 2 and MnO 2 -TiO 2 have a significant impact on the enhanced photocatalytic performance for formaldehyde removal. Meanwhile, the hydroxyl radicals (·OH) and superoxide radicals (·O 2 - ) also play a major role in removal of formaldehyde. The formaldehyde removal rate of 70UO/MnO 2 -TiO 2 (1 g 0.15 m 3 ) in self-made closed system under high pressure mercury lamp irradiation is 88.19 % within 5.5 h, if the removal time is extended to 24 h, the formaldehyde removal rate can reach 95.19 %, and the continuous photocatalytic reaction showed that the composite is a highly stable catalyst.
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Environmental Science-Nano
·
2025
·
IF 5.1
Lu Wang,Siyuan Zhang,Jukun Xiong,Meicheng Wen
Formaldehyde (HCHO), a prevalent indoor volatile organic compound, poses significant health risks to humans even at very low concentrations. As a result, its efficient degradation at room temperature is of utmost importance. However, the detailed mechanism for catalytic oxidation of formaldehyde remains unclear, particularly regarding the role of water vapor, which has been subject to considerable debate. In this study, we synthesized Pt-supported TiO2 glass fiber catalysts (Pt/TiO2 GF) via NaBH4 reduction to investigate the reaction pathways and clarify the influence of water vapor on the oxidation process. The reaction mechanism and intermediates were systematically studied at room temperature using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), kinetic isotope effect (KIE) analysis, and density functional theory (DFT) calculations. Results revealed a clear reaction pathway of HCHO → DOM → HCOO− → CO2, with formate C–H bond cleavage (HCOO−* + O* → CO2 + OH*) identified as the rate-determining step. Both experimental KIE results and theoretical calculations confirmed that water vapor substantially reduces the activation barrier for this step, significantly promoting formate decomposition and subsequent CO2 formation. This work provides critical insights into the role of water in enhancing formaldehyde oxidation and offers theoretical support for developing efficient catalysts suitable for humid environments.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Chengxin Li,Weijie Wei,Lan He,Xinyu Qi,Jingjing He,Xiaqing Zhang,Xintong Han,Jiang Wang,Zhuwei Gao
In recent years, photo-responsive self-cleaning oil/water (O/W) separation materials for oil-containing wastewater have been widely used in the field of oily wastewater. Herein, in this paper, a petal-like superhydrophobic Fe/TiO 2 membrane was prepared using stainless steel reacted with dynamically eroded titanium dioxide microspheres in an acidic environment for efficient separation of oil and water and photocatalytic degradation of dyes in oil. The results showed that the membrane had excellent light absorption properties in the visible spectrum. The average oil-water separation efficiency of the Fe/TiO 2 membrane was 96.4 %, and the average oil flux was 16,221.88 L m −2 h −1 . Sudan III dye was photocatalytically degraded in the petal-like micro-nanostructures of anatase-type titanium dioxide, and the Fe/TiO 2 membrane possessed good self-cleaning function. In addition, the specially structured Fe/TiO 2 membrane also showed better separation efficiency and oil permeability after light exposure compared to natural conditions. These works can provide references for oil pollution treatment and environmental protection, which are of great significance.
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