CHINESE JOURNAL OF CATALYSIS
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2015
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IF 1.964
Xin Zhao,Lei Huang,Hongrui Li,Hang Hu,Jin Han,Liyi Shi,Dengsong Zhang
Different transition metals were used to modify V 2 O 5 -based catalysts (M-V, M = Cu, Fe, Mn, Co) on TiO 2 via impregnation, for the selective reduction of NO with NH 3 . The introduced metals induced high dispersion in the vanadium species and the formation of vanadates on the TiO 2 support, and increased the amount of surface acid sites and the strength of these acids. The strong acid sites might be responsible for the high N 2 selectivity at higher temperatures. Among these catalysts, Cu-V/TiO 2 showed the highest activity and N 2 selectivity at 225–375 °C. The results of X-ray photoelectron spectroscopy, NH 3 -temperature-programmed desorption, and in-situ diffuse reflectance infrared Fourier transform spectroscopy suggested that the improved performance was probably due to more active surface oxygen species and increased strong surface acid sites. The outstanding activity, stability, and SO 2 /H 2 O durability of Cu-V/TiO 2 make it a candidate to be a NO x removal catalyst for stationary flue gas.
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Journal of Environmental Sciences
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2014
·
IF 1.922
Qingkong Chen,Fangying Ji,Qian Guo,Jianping Fan,Xuan Xu
A novel coupled system using Co–TiO 2 was successfully designed which combined two different heterogeneous advanced oxidation processes, sulfate radical based Fenton-like reaction (SR-Fenton) and visible light photocatalysis (Vis-Photo), for degradation of organic contaminants. The synergistic effect of SR-Fenton and Vis-Photo was observed through comparative tests of 50 mg/L Rhodamine B (RhB) degradation and TOC removal. The Rhodamine B degradation rate and TOC removal were 100% and 68.1% using the SR-Fenton/Vis-Photo combined process under ambient conditions, respectively. Moreover, based on XRD, XPS and UV-DRS characterization, it can be deduced that tricobalt tetroxide located on the surface of the catalyst is the SR-Fenton active site, and cobalt ion implanted in the TiO 2 lattice is the reason for the visible light photocatalytic activity of Co–TiO 2 . Finally, the effects of the calcination temperature and cobalt concentration on the synergistic performance were also investigated and a possible mechanism for the synergistic system was proposed. This coupled system exhibited excellent catalytic stability and reusability, and almost no dissolution of Co 2 + was found.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
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IF 2.714
Muxi Luo,Xuejiao Qi,Tongxuan Ren,Yuxiong Huang,Arturo A. Keller,Hongtao Wang,Boran Wu,Huapeng Jin,Fengting Li
CeO 2 and TiO 2 engineered nanoparticles (ENPs) are being increasingly used in many applications. Due to their properties, heteroaggregation between these two types of ENPs is very likely, which can determine their fate and transport. However, the heteroaggregation behavior of CeO 2 and TiO 2 ENPs is still not clear, partly due to the lack of appropriate tools. In this study, we investigated the application of Turbiscan Stability Index (TSI) for the measurements of CeO 2 /TiO 2 ENP heteroaggregation. TSI was found to be effective to investigate the heteroaggregation and stability of the CeO 2 -TiO 2 ENPs system. Increasing CeO 2 /TiO 2 ENPs ratio reduces the TSI values, indicating higher stability. Fluorescence excitation-emission matrix (EEM) spectra were used to study the interface interaction between humic acid (HA) and CeO 2 /TiO 2 ENPs. The TSI value of ENPs were rising with the increasing of CeO 2 /TiO 2 ENPs ratios in the H River or Q Reservoir water. In addition, their variation trends were similar to those in well-controlled synthetic water. Proposed interaction mechanisms include surface charge attraction and competitive adsorption.
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Solar RRL
·
2024
·Vol. 8
·期 19
·2400443
·
IF 6
Shuyue Xue,Sheng Yang,Yukai Liu,Jinzhan Su
CsPbIBr 2 has garnered significant interest due to its ideal bandgap and good stability. However, defects formed at the interface between the electron transport layer and the perovskite can lead to increased non-radiative recombination, which negatively impacts both the power conversion efficiency (PCE) of perovskite solar cells and the long-term stability of the cells. Herein, the TiO 2 /perovskite interface is modified by adding sodium silicate to passivate the defects on the interface. The introduction of Na + partially reduces Ti 4+ to Ti 3+ in TiO 2 , thereby passivating trap states caused by oxygen vacancy defects and adjusting the energy level alignment between TiO 2 and the perovskite film, enhancing the carrier transport efficiency. Additionally, SiO 3 2− can form Si O Pb (and Cs) bonds with the undercoordinated Pb 2+ and Cs + on the surface of the perovskite layer, effectively passivating surface defects of the perovskite film and thereby improving the efficiency of the devices. Ultimately, the carbon-based all-inorganic CsPbIBr 2 perovskite solar cells treated with Na 2 SiO 3 exhibit a significantly improved PCE of 10.85% compared to 8.62% of the control sample and achieve a high open-circuit voltage of 1.31 V. With this modification, the devices also demonstrate reduced hysteresis effects and enhanced stability.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Weishan Qin,Ting Su,Guodong Chai,Xinhong Wang,Weichao Qin,Hongbin Yu
Photoelectrocatalysis is a promising method for removing biorefractory organic pollutants. However, the inefficient utilization of light and electricity by photoanodes and the failure to effectively execute cathode functions typically lead to poor degradation performance. Therefore, in this study, a photoelectrocatalytic (PEC) system coupled with electro-activated persulfate (E-PS) was constructed using a 3D nanostructured PbO 2 /Sb-SnO 2 //blue-TiO 2 //WO 3 bifacial anode and a Mo-CuFeO 2 -modified carbon felt cathode. The results indicate that the bifacial anode could effectively implement electro-assisted photocatalysis on the irradiating side and electrocatalysis on the back side. This significantly accelerated acetaminophen degradation with a synergy index of 48.98 %. Additionally, the PEC/E-PS system was established by combining a bifacial anode with a persulfate-activated cathode, which promoted the efficient utilization of photogenerated electrons and increased the number of active species in the coupled system. Density functional theory calculations confirmed that Mo tended to dope the Fe sites and promote the adsorption of PS on Mo-CuFeO 2 , facilitating the continuous activation of persulfate. In the coupled system, the contribution order of different active species to acetaminophen degradation was h + > OH > SO 4 − > 1 O 2 > O 2 − . Their mutual conversion enabled the PEC/E-PS system to efficiently remove acetaminophen with a relatively high current efficiency (22.69 %) and low energy consumption (0.06 kWh⋅gCOD −1 ). The proposed PEC/E-PS system is an efficient and sustainable method for treating organic contaminants in wastewater.
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Journal of Water Process Engineering
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2024
·
IF 6.3
Da Wang,Yuyue Huang,Sisi Xiao,Qingjie Xie,Bianbadrolma,Huijuan Wang
This study applied the advanced oxidation process of simulated sunlight-induced periodate activation (SSL/PI) to degrade antibiotics. In order to enhance degradation, TiO 2 was also added to the SSL/PI system to create a synergistic effect (SSL/PI/TiO 2 ) and boost the degradation process. Sulfadiazine (SDZ) was selected as the target pollutant to investigate the enhancement from TiO 2 addition and the influential parameters on degradation. The obtained results showed that PI concentration was the most important parameter affecting SDZ degradation, while TiO 2 dosage and solution pH had less impact. Adding Fe 2+ and CO 3 2− inhibited SDZ degradation, while Cu 2+ and Cl − had minimal effect. DFT analysis indicated that the C4, C5, N23, N26, and N27 sites of the SDZ molecule were susceptible to be attacked by the formed reactive species. The key reactive species responsible for SDZ degradation in the SSL/PI/TiO 2 system were •O 2 − , 1 O 2 , IO 3 •, and •OH. LC-MS analysis identified 10 main byproducts during SDZ degradation, then three possible degradation pathways were predicted. The concentration detection of I 2 , I 3 − , and HOI, along with lettuce seed germination experiments, verified that the toxicity of the SDZ solution reduced after treatment with the SSL/PI/TiO 2 process.
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CATALYSIS LETTERS
·
2025
·Vol. 155
·期 3
·1-14
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IF 2.4
Xu Shiwei,Zhang Song,Zhao Haiguang,Liu Bing,Zhang Yuanming
Developing simple, durable, and efficient photocatalysts is crucial for achieving environmentally friendly treatment of organic pollutants in water. In this study, nanoscale titanium dioxide (TiO 2 ) with a size of approximately 5 nm was synthesized using the sol-gel method, and carbon quantum dots (CQDs) with a size of around 3–5 nm were prepared via a vacuum heating process. The preparation conditions could be controlled to render the TiO 2 surface positively charged and the CQDs surface negatively charged. The combination of TiO 2 with CQDs can form a heterojunction, thereby improving light absorption and the separation efficiency of photogenerated carriers. This enables effective light harvesting and carrier transfer, enhancing the photocatalytic performance. The ζ-potentiometer and electron spin resonance (ESR) measurements confirmed the successful fabrication of high-performance TiO 2 /CQDs composites through electrostatic attraction, forming an interfacial high-speed channel for the transfer of photogenerated carriers. The results demonstrated that the degradation kinetics rate of TiO 2 /CQDs composites reached 0.1345 min − 1 and degraded 98% of tetracycline hydrochloride within 30 min, which is 6.0 and 4.9 times higher than individual TiO 2 and CQDs, respectively. Based on analytical data and experimental results, the photocatalytic mechanism was elucidated, and intermediates along with reactive species were identified to propose possible degradation pathways. Additionally, antimicrobial testing confirmed the nontoxicity of the constructed catalysts and the complete degradation of the pollutants. Graphical abstract
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Journal of Water Process Engineering
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2024
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IF 6.3
Yining Dai,Yanling Yang,Xing Li,Nan Wang,Zhiwei Zhou,Jianyong Feng,Yongwang Liu,Hang Li
Reusing treated greywater indoors in buildings is an advanced strategy to increase the utilization of limited water resources , but currently there is a lack of feasible technologies for efficiently purifying greywater indoors. In this study, we construct the heterogeneous TiO 2 -stainless steel mesh (SSM) interface with photocatalytic degradation of sodium dodecylbenzene sulfonate (SDBS) by under vacuum ultraviolet (VUV) irradiation. At the initial SDBS of 10 mg/L, the degradation rates of SDBS with UV/TiO 2 -SSM and VUV/TiO 2 -SSM process were 53 % and 74 % respectively within 50 min. The results of specific scavengers experiments and EPR analysis revealed that the ·OH, h + and direct photolysis contributed to SDBS degradation and mineralization . The degradation rate of SDBS in VUV/TiO 2 -SSM process was higher at weak acid or weak alkali conditions, while the performance of UV/TiO 2 -SSM process was better at alkaline conditions. Both Cl − and HCO 3 − could inhibit SDBS degradation, while SO 4 2− slightly promoted the degradation. Active oxygen species mainly degrade SDBS in two ways: by attacking the α carbon, β carbon, or branched chain carbon on the alkane chain ; or by attacking the adjacent carbon on the alkane chain, resulting in the formation of three branch forms of products. The toxicity of the intermediate products shows a decreasing or stable trend. The experiment shows that UV or VUV photocatalytic TiO 2 -SSM has a good prospect of removing anionic surfactant in the real greywater. This study provides strategies for the development and design of indoor water reuse technologies and devices in buildings.
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Molecular Catalysis
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2024
·
IF 3.9
Huafan Li,Weijia Han,Tianli Zhu,Ligong Chen,Luis Ricardez-Sandoval,Guoyi Bai
In this work, a NiTi-MMO/TiO 2 -R catalyst was prepared by in-situ generation of a TiO 2 support during hydrothermal synthesis of the hydrotalcite precursor for NiTi-MMO. The formation of NiTi-MMO can reduce the size of metallic Ni particles, which can significantly improve the catalyst's activity, and the in-situ generated TiO 2 support can enhance the dispersion of NiTi-MMO and the utilization efficiency of the active nickel species. The NiTi-MMO/TiO 2 -R catalyst showed high activity for the hydrogenation of dioctyl phthalate to dioctyl-1,2-cyclohexanedicarboxylate. The catalyst also exhibited good stability, maintaining the yield over 90 % after 6 cycles. Characterization results showed that a strong metal-support interaction was formed between the in-situ generated TiO 2 support and the metallic Ni particles produced by the reduction of NiTi-MMO. The strong metal-support interactions formed between metallic Ni particles and the in-situ generated TiO 2 played a crucial role in stabilizing the nickel species and preventing their aggregation, resulting in superior catalytic performance.
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Food Packaging and Shelf Life
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2024
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IF 8.5
Zeyu Qin,Qinbo Jiang,Meiyu Chen,Jiawen Li,Hui Zhang
In this paper, we designed a food packaging which could not only accelerate the postharvest ripening of banana, but also prolong the shelf life of banana. First, we prepared polycaprolactone (PCL) nanofibers deposited with nanosized γ-cyclodextrin metal-organic frameworks (CD-MOFs) and TiO 2 nanoparticles (TiO 2 @CD-MOF@PCL), CD-MOFs were used to encapsulate ethylene, and TiO 2 nanoparticles were used to degrade ethylene. The ethylene adsorption capacity of nanosized CD-MOF was evaluated, and results showed that the isosteric enthalpy of adsorption (Δ H ads ) was −41.58 kJ/mol. The ethylene pressure, as the critical factor, led to ethylene loading content reaching 1.46 % by 1.6 MPa pressure, 25 °C temperature, 24 h encapsulation time, and 10 min electrospraying time. The releasing behavior of ethylene was affected by humidity and temperature, and under 90 % RH and 20 °C, 92.12 % ethylene was released on the 3th day. The photooxidation degradation experiment proved that as the TiO 2 nanoparticle loading content increased from 1 % to 3 %, the photooxidation degradation activity increased. The degradation rate of ethylene was improved as ethylene concentration increased. In addition, E @ TiO 2 @CD-MOF@PCL (E represents ethylene) nanofiber film was proved that it could shorten ripening period of banana by releasing ethylene. After being irradiated by ultraviolet, shelf life of banana was prolonged by degrading ethylene.
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Frontiers in Chemistry
·
2024
·
IF 3.8
Ali S. Alkorbi,Nouman Gill,Muhammad Naveed Anjum,Muhammad Jawwad Saif,Mirza Nadeem Ahmad,Muhammad Bilal Qadir,Zubair Khaliq,Mohd Faisal,Mohammed Jalalah,Farid A. Harraz
Industrial dye effluent causes significant risks to the environment. The present study was focused on photocatalytic degradation of the dye Direct Red 28 using a ternary composite of graphitic carbon nitride, TiO2, and polyorthoanisidine (g-C3N4/TiO2/POA), prepared by in-situ oxidative polymerization o-anisidine. The synthesized composite g-C3N4/TiO2/POA properties were characterized using different analytical techniques. X-ray diffraction (XRD) results revealed the prominent pattern of TiO2 and g-C3N4 in the composite peak at 2θ° while Fourier transform infrared (FTIR) results provided the confirmation peaks for g-C3N4/TiO2/POA and POA at 1,110 cm−1 and 1,084 cm−1 for C-O-C ether. Scanning electron microscopy (SEM) demonstrated an increase in the average size of the composite up to 428 nm. The energy-dispersive X-ray spectroscopy (EDX) spectrum provided the weight percentages of the C, O, and Ti in the composite were 8.5%, 45.69%, and 45.81%, respectively. The photocatalytic degradation of Direct Red 28 dye under UV irradiation using a composite showed that 86% Direct Red 28 dye was degraded by a 30 mg/L dose of g-C3N4/TiO2/POA in 240 min at pH 2. After four consecutive cycles, the utilized composite showed 79% degradation of Direct Red 28, demonstrating the stability and effectiveness of the g-C3N4/TiO2/POA photocatalyst. The high reusability and efficiency of the g-C3N4/TiO2/POA composite are due to increased light absorption range and reduced e−/h+ recombination rate in the presence of g-C3N4 and POA.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Jialin Liang,Fang Yuan,Ting Liu,Chenguang Qian,Zhangshuo Song,Lijuan Wei,Chunquan Li,Zhiming Sun
Photothermal catalytic oxidation is a promising and sustainable method for the degradation of indoor formaldehyde (HCHO). However, the excessively high surface temperature of existing photothermal catalysts during catalysis hinders the effective adsorption and degradation of formaldehyde under static conditions. Catalyst loading and oxygen vacancies (OVs) modulation are commonly employed strategies to reduce the photothermal catalytic temperature and enhance the efficiency of photothermal catalytic oxidation. In this work, a p-n type CuO/TiO 2 heterojunction is successfully loaded onto diatomite using a wet precipitation method. Under the irradiation of a 300W xenon lamp, the prepared composite material achieved a 100% removal rate of HCHO within 2 h, with a 98% conversion rate to CO 2 , surpassing the performance of both individual photocatalysts and thermocatalysts. Additionally, by adjusting conditions such as light irradiation and temperature, we have demonstrated that this material exhibits synergistic photothermal catalytic properties. Based on HRTEM, XPS, Raman, and EPR analyses, the introduction of diatomite as a catalyst support was shown to effectively increase the number of OVs. Experimental results, along with O 2 -TPD, photoelectrochemical characterization, and radical detection, demonstrate that the presence of OVs enhances the oxidative efficiency of both photocatalysis and thermocatalysis, as well as the UV–Vis-IR photothermal catalytic performance. The ternary composite material generates weak hydroxyl ( • OH) and superoxide ( • O 2 − ) radical under high-temperature with dark conditions, indicating its catalytic oxidation activity under this condition. The increase in temperature and the expansion of the spectral range both enhance the generation of these radicals. In summary, this work demonstrates that the use of diatomite as a support increases the material's specific surface area and OVs content, thereby enhancing adsorption and photothermal catalysis. It elucidates the enhanced catalytic degradation mechanism of this mineral-based photothermal catalyst.
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