Heliyon
·
2024
·
IF 3.4
Yige Guo,Xiaoxue Niu,Huaiyu Yang,Liwen Chen,Yizhen Ren,Huining Guo,Bo Wu
The oxidation rate of NO to NO 2 is a critical parameter in the removal of NO x within selective catalytic reduction (SCR) systems. LaCoO 3-δ is a kind of potential catalyst to enhance the oxidation of NO to NO 2 , it may offers an economic and stable alternative to noble metal catalysts, particularly at elevated temperatures. This study aimed to enhance the catalytic efficiency of LaCoO 3-δ through strontium (Sr) doping. La 1-x Sr x CoO 3-δ (with varying x values of 0.1, 0.2, 0.3, 0.4) was synthesized using a sol-gel method. La 1-x Sr x CoO 3-δ exhibited superior NO oxidation catalytic activity compared to LaCoO 3-δ , with the most notable enhancement observed at x = 0.3 (84 % conversion). This improvement can be attributed to the substitution of La 3+ with Sr 2+ , which induces lattice distortion and charge imbalance, thereby creating more oxygen vacancies that enhance the catalytic oxidation capability of La 1-x Sr x CoO 3-δ . However, it's important to note that an excessive amount of Sr can result in the formation of SrCO 3 deposits on the surface of La 1-x Sr x CoO 3-δ , thereby diminishing its catalytic oxidation performance. The catalytic oxidation reaction behavior adhered most closely to the O 2 -adsorbed E-R model, the surface defects in La 1-x Sr x CoO 3-δ playing a pivotal role in the catalytic reaction.
研究领域:
化学
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环境科学
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材料科学
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Yucheng Ou,Gangqiang Zhu,Fei Rao,Jianzhi Gao,Jun Chang,Xiaotao Xie,Weibin Zhang,Yu Huang,Mirabbos Hojamberdiev
Coral-like TiO2−δ microstructures with high surface area were synthesized by a simple hydrothermal method, followed by thermal treatment in a N2 atmosphere. The introduction of oxygen vacancies (OVs) to TiO2 significantly improved light absorption and inhibited the recombination of photogenerated charge carriers. Then, multiwalled carbon nanotubes (CNTs) and N-doped carbon quantum dots (N-CQDs) were decorated on the surface of coral-like TiO2−δ microstructures. The CNTs could greatly improve the separation and transfer efficiency of photogenerated charge carriers, while the N-CQDs could further extend light absorption to longer wavelengths, including the IR region. According to the results of electron spin resonance (ESR) spectroscopy, the introduction of OVs to TiO2−δ and surface modification with CNTs and N-CQDs promoted the generation of •O2– and •OH active species. The formation of •O2– and •OH active species on the surface of TiO2−δ/CNTs/N-CQDs played an important role in the deep oxidation and selective conversion of NO into nitrate. Density functional theory calculations revealed the adsorption and reaction sites for H2O and O2 separately in space over the surface of TiO2−δ/CNTs/N-CQDs. Namely, the reaction sites of H2O and O2 are on the surface of TiO2−δ and CNTs, respectively. The electron transfer from TiO2−δ to CNTs was further verified through the differential charge density. This study demonstrates a straightforward approach for designing full-spectrum-responsive photocatalysts with high efficiency, stability, and selectivity for NO removal.
研究领域:
材料科学
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环境科学
·
光催化
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Huasheng Wang,Shuang Deng,Hongyun Hu,Can Fang,Guangqian Luo,Ze Wang,Songgeng Li
Excessive ClO 2 tends to be produced and escape, causing secondary pollution when wet oxidation of NO with NaClO 2 is conducted under acidic conditions. NaClO 2 alkaline oxidation has accordingly received a wide attention. In this work, NaClO 2 alkaline oxidation of NO has been systematically studied in a self-built spray tower. Focus has been placed on the effects of acidic components contained in flue gas such as CO 2 , HCl and SO 2 . ClO 2 and HClO 2 are considered more effective for NO oxidation, which tend to be produced in an acidic environment. HCO 3 − has a relatively higher hydrolysis coefficient than ClO 2 − , leading to more HClO 2 formation. Similarity is found with HCl although the effect is not as significant as CO 2 due to its low concentration in flue gas. SO 2 exhibits a negative effect on NO removal since HClO 2 can be consumed by SO 2 . Nearly 100 % NO removal efficiency can be achieved although there is an initial time delay necessary for the neutralization of alkaline environment. A similar performance has been observed for HCl. On the contrary, SO 2 exhibits a negative effect on NO removal due to the competition with NO in the consumption of NaClO 2 . Additives such as NaClO and CTAC were also used to enhance NaClO 2 alkaline oxidation performance. Interesting to note that CTAC can nearly eliminate the time delay by intensifying the gas-liquid mass transfer.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Fanyu Meng,Lina Guo,Haocheng Zou,Boming Zhu,Fayang Zhou,Yiqing Zeng,Jiayou Han,Jun Yang,Shule Zhang,Qin Zhong
To achieve high NO oxidation efficiency, excessive O 3 must be used, which would lead to the high cost and escape of ozone. Herein, we adopted low cost and environmental-friendly TiO 2 as the catalyst of low concentration O 3 and H 2 O 2 system for high-efficiency NO x oxidation. The Ti sites on TiO 2 were the deprotonation sites of H 2 O 2 and H 2 O into Ti-OOH and Ti-OH species, respectively. We found that the surface of rutile phase TiO 2 had a low concentration Ti-OOH component but a large amount of Ti-OH after contacting with H 2 O 2 solution, thus lots of ·OH and a few O 2 − radicals formed with introducing O 3 molecules. H 2 O 2 solution induced the formation of a large amount of Ti-OOH and Ti-OH species on the anatase phase TiO 2 surface, thus lots of O 2 − generated in the O 3 /H 2 O 2 system. O 2 − and O H radicals could efficiently oxidize NO, in which O 2 − radicals could oxidize NO to NO 3 − in one step with high selectively. Therefore, anatase TiO 2 had better performance in NO x oxidation than rutile phase TiO 2 . The effect of temperature and SO 2 concentration on NO oxidation was also investigated, the results showed that TiO 2 -A/O 3 /H 2 O 2 system promoted NO oxidation at a low temperature and a low concentration of SO 2 .
研究领域:
环境科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2014
·
IF 1.552
Zhongyi An,Yuqun Zhuo,Chao Xu,Changhe Chen
Mn-based catalysts impregnated on TiO 2 with different crystalline phases (rutile (R), anatase (A), and P25 (P)) were studied for the oxidation of NO to NO 2 . 10%MnO x /TiO 2 (P) was the most active catalyst, giving 83% of NO conversion at 300 °C and a GHSV of 20000 h −1 . The catalyst activities were in the order MnO x /TiO 2 (P) > MnO x /TiO 2 (A) > MnO x /TiO 2 (R). The catalysts were characterized by X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, H 2 temperature-programmed reduction, and O 2 temperature-programmed desorption. Compared to anatase and rutile, P25 gave better dispersion of MnO x on the support surface, suppressed the agglomeration of catalyst particles, and also produced more Mn 2 O 3 , which was more active for the oxidation of NO. In addition, P25 enhanced the reduction of MnO x , especially for Mn 2 O 3 , and the formation of easily desorbed O 2 − generated from the Mn 3+ –O bond.
研究领域:
催化化学
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Tongtong Cheng,Yiqi Tang,Heping Zhang,Xingqi Song,Gongcheng Xu,Ying Zhou,Xinghui Hou
SnO 2 is an n-type wide band gap (E g = 3.6 eV) metal oxide semiconductor (MOS) that has been widely studied, due to its low cost, non-toxicity and simple preparation process, and it has become the most important sensitive material for the preparation of gas sensors. However, the SnO 2 sensor still has some defects of high operating temperature and low response, which hinders its practical application. In this work, SnO 2 /SnS composites were prepared by hydrothermally growing SnS nanoparticles on the surface of electrospun hollow SnO 2 nanotubes with high porosity. Results show that the SnO 2 /SnS gas sensor based on the heterojunction has a much higher response of 375 to 50 ppm NO at 130 ℃ than that of pure SnO 2 sensor, as well as rapid response/recovery (26 s/90 s), excellent selectivity (12 times that of H 2 S), repeatability and stability (225–250 to 20 ppm NO). Its enhanced sensing property may be attributed to the synergistic effect of the formation of homologous cations heterojunction and unique micro-structure of SnO 2 /SnS composite, which could facilitate efficient charge transfer and provide more active sites (such as vacancy, point defects) for NO adsorption and reaction. This experiment provides a new idea for the development of SnO 2 gas sensors with excellent properties, which can meet the detection of toxic and harmful gas.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
Processes
·
2022
·Vol. 10
·期 10
·1946
·
IF 3.352
Hong Shen,Zijun Tang,Xiang Xiao,Haiwen Wu,Hang Zhou,Ping Fang,Dingfang Zhu,Jianhua Ge
In this study, Mn-Ce/Al2O3/TiO2catalyst prepared by impregnation method was used for synergistic O3oxidation NO. The catalyst prepared by impregnating Al2O3/TiO2at a Mn:Ce molar ratio of 4:1 showed the best catalytic activity. The catalyst performance showed that when the molar ratio of Mn:Ce was 4:1 and the volume ratio of O3:NO was 1:4, the removal rate of NO could reach 63%, which could increase the removal rate by 40% compared with that of NO oxidized by O3alone. BET, XRD, and TEM characterization results showed that when the molar ratio of Mn:Ce was 4:1, the catalyst specific surface area, and pore capacity were the largest. A large amount of MnOx and CeOx were distributed on the catalyst surface. The XPS analysis showed that the oxidation-reduction and oxygen vacancy of Mn (IV)/Mn (III)/Mn (II) and Ce (IV)/Ce (III), had a synergistic effect on the decomposition of O3into reactive oxygen species(O*), thus improving the catalytic capacity of Mn-Ce/Al2O3/TiO2catalyst for O3. The O2-TPD analysis showed that the oxygen vacancies and oxygen species in the catalyst could be used as the active point of decomposition of O3into O*. The experimental results show that the prepared catalyst can significantly improve the efficiency of ozone oxidation of NO and reduce the amount of ozone. The catalyst can be applied to ozone oxidation denitrification technology.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Asian Journal of Pharmaceutical Sciences
·
2024
·
IF 10.7
Shengnan Huang,Chenyang Zhou,Chengzhi Song,Xiali Zhu,Mingsan Miao,Chunming Li,Shaofeng Duan,Yurong Hu
Postoperative tumor recurrence remains a predominant cause of treatment failure. In this study, we developed an in situ injectable hydrogel, termed MPB-NO@DOX + ATRA gel, which was locally formed within the tumor resection cavity. The MPB-NO@DOX + ATRA gel was fabricated by mixing a thrombin solution, a fibrinogen solution containing all-trans retinoic acid (ATRA), and a Mn/NO-based immune nano-activator termed MPB-NO@DOX. ATRA promoted the differentiation of cancer stem cells, inhibited cancer cell migration, and affected the polarization of tumor-associated macrophages. The outer MnO 2 shell disintegrated due to its reaction with glutathione and hydrogen peroxide in the cytoplasm to release Mn 2+ and produce O 2 , resulting in the release of doxorubicin (DOX). The released DOX entered the nucleus and destroyed DNA, and the fragmented DNA cooperated with Mn 2+ to activate the cGAS-STING pathway and stimulate an anti-tumor immune response. In addition, when MPB-NO@DOX was exposed to 808 nm laser irradiation, the Fe-NO bond was broken to release NO, which downregulated the expression of PD-L1 on the surface of tumor cells and reversed the immunosuppressive tumor microenvironment. In conclusion, the MPB-NO@DOX + ATRA gel exhibited excellent anti-tumor efficacy. The results of this study demonstrated the great potential of in situ injectable hydrogels in preventing postoperative tumor recurrence.
研究领域:
肿瘤学
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生物材料学
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免疫学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zanyun Ying,Xinya Wang,Chengzhi Wu,Shihan Zhang
Photocatalytic NO degradation often suffers from sluggish charge carrier separation and low selectivity. Herein, a series of In 2 O 3 /TiO 2 (P25) composites were synthesized to enhance NO abatement. Benefiting from the conspicuous synergistic effect between In 2 O 3 and P25, the In 2 O 3 /P25 catalysts demonstrated more than double the NO elimination performance compared to pure P25 and In 2 O 3 . The In 2 O 3 /P25 sample with 75 wt% In 2 O 3 (In-P25-75) achieved a NO removal efficiency of 51.7 %, higher than reported catalysts (30.0–49.0 %). It was the successful formation of type-II heterostructure that enabled intimate interfacial contact and provided ample electron transfer channels. Moreover, photoluminescence spectra and photoelectrochemical measurement confirmed the improved separation and inhibited recombination of photogenerated charge carriers in In-P25-75, thereby boosting the NO photocatalytic efficiency. ·O 2 − and ·OH radicals generated by photoinduced electron transfer to the conduction band of P25, along with the induced holes confined to the valence band of In 2 O 3 , facilitated the targeted deep oxidation of trace NO into NO 3 − rather than harmful NO 2 . This work discloses a promising strategy for the efficient removal of NO from the atmosphere by reducing the emission of hazardous intermediate NO 2 .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Tianjiao Wu,Bibo Ma,Huanhuan Bai,Lin Wang,Yumei Zhang,Qingzhi Luo,Jing An,Huiying Mu,Desong Wang,Yandong Duan
Developing highly efficient photocatalysts that selectively convert NO pollutants to NO 3 ¯ while storing metabolic nitrogen for crops remains a great challenge. Simultaneously, there is a dearth of research investigating the relationship between the chemical environment and the activity of catalytic sites. Herein, an efficient impregnation approach to access atomically dispersed Sr single atoms supported on Nb 2 O 5 is reported; meanwhile, various ligands (-Cl, -Br, -OH) are employed to customize the local structure. The results show that Cl-Sr/Nb 2 O 5 exhibits excellent catalytic performance in eliminating NO, which is significantly superior to other catalysts. The introduction of Sr atom and ligand increases the energy barrier of NO 2 formation, thus improving the selectivity of converting NO to NO 3 ¯. This study highlights the importance of precisely designing the catalytic site at the atomic level, and the obtained insights may serve as a valuable guide for developing future catalyst designs.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Hongxia Liu,Hui Mei,Shiping Li,Longkai Pan,Zhipeng Jin,Gangqiang Zhu,Laifei Cheng,Litong Zhang
Bismuth titanate (Bi 12 TiO 20 ) with unique sillenite structure has been shown to be an excellent photocatalyst for environmental remediation. However, the narrow light-responsive range and rapid recombination of photoinduced electrons-holes limit the photocatalytic performance of Bi 12 TiO 20 . To overcome the limitations, a practical and feasible way is to fabricate heterojunctions by combining Bi 12 TiO 20 with suitable photocatalysts. Here, using a facile chemical precipitation method, a novel and hierarchical core–shell structure of n-Bi 12 TiO 20 @p-BiOI (BTO@BiOI) heterojunction was rationally designed and synthesized by loading BiOI nanosheets on BTO nanofibers. The constructed BTO@BiOI composites exhibited significant charge transfer ability due to the synergistic effects of the built-in electric field between BTO and BiOI as well as close interfacial contacts. In addition, the narrow bandgap characteristics of the BiOI led to wide light absorption ranges. Therefore, the BTO@BiOI heterojunction exhibited an improved photocatalytic performance under visible light irradiation. The NO removal efficiency of optimal BTO@BiOI was 45.7%, which was significantly higher compared to that of pure BTO (3.6%) or BiOI (23.1%). Moreover, the cycling experiment revealed that BTO@BiOI composite has a good stability and reusability. The possible mechanism of photocatalytic NO oxidation over BTO@BiOI was investigated in detail.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yongheng Xiong,Qin Zhong,Man Ou,Wei Cai,Shipeng Wan,Yang Yu,Shule Zhang
The discovery of effective methods toward nitric oxide (NO) removal by solution is valuable for the cost-effective flue gas control. In this study, it is first reported that nitrous oxide (N2O) is obviously suppressed by using copper oxide (CuO) combined with (NH4)2SO3 (NS) solution. CuO has been characterized, and the effects of reactants concentration, additives, temperature, pH and powder size on NO absorption process have been evaluated. The selectivity of N2O can drop from 91.30% to 11.25% under the optimum experimental conditions. Furthermore, based on the method of single-factor analysis, the inhibition of N2O is identified as the coeffect of NS/CuO. In addition, the pathways of NO removal are divided into two parts—N2O formation and NO absorption—and its ratio is calculated in the range of 0.29–0.53. Because of the continuous supply of NS from ammonia desulfurization, this study opens the feasibility of simultaneous desulfurization and denitrification.
研究领域:
环境科学
·
化学工程
·
大气污染控制
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）