Catalysts
·
2022
·Vol. 12
·期 11
·1435
·
IF 4.501
Fujian Yang,Cheng Yin,Mengqiao Zhang,Jiangwei Zhu,Xiuyuan Ai,Wenchao Shi,Guilong Peng
The activation of persulfate (PS) by Fe(III) for the removal of environmental organic pollutants was severely limited by the low reduction rate from Fe(III) to Fe(II). In present study, we reported that reducing sulfur species (i.e., SO32−, HSO3−, S2−, and HS−) under low concentration could significantly accelerate the Fe(III)/Fe(II) cycle in the Fe(III)/PS system. Under the condition of 1.0 mM Fe(III) and 4.0 mM PS, the removal performance of Fe(III)/PS system was poor, and only 21.6% of BPA was removed within 40 min. However, the degradation efficiency of BPA increased to 66.0%, 65.5%, 72.9% and 82.7% with the addition of 1.0 mM SO32−, HSO3−, S2−, and HS−, respectively. The degradation efficiency of BPA was highly dependent on solution pH and the concentration of reducing sulfur species. When the reductant was excessive, the removal efficiency would be significantly inhibited due to the elimination of reactive species. This study provided some valuable insights for the treatment of organic wastewater containing these inorganic reducing ions.Keywords:persulfate;reducing sulfur species;cycle;degradation
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Zhifei Hao,Guoquan Liu,Nan Ma,He Zhang,Yi Li,Yuguo Xia,Dongpeng Zhang,Sihui Zhan
Acidity and redox properties of the catalyst are two crucial factors affecting the performance of NH 3 -SCR. Herein, we design a novel WO x /Cu-CeO 2 oxide catalyst in which the WO x species are highly dispersed on the {111}/{100}-terminated surface of Cu-doped CeO 2 nanospheres , which exhibits great deNO x activity advantage and wide operating temperature window (200–400 °C, over 85% NO x conversion with a gas hourly space velocity (GHSV) of 60,000 h −1 ), as well as good sulfur resistance and N 2 selectivity . The relationship among the composition, acidity and redox properties of the WO x /Cu-CeO 2 catalyst is established in the NH 3 -SCR reaction. The combined experimental studies and spectroscopic characterization reveal that the introduction of Cu into the lattice of CeO 2 not only increases the surface Ce 3+ and oxygen vacancy concentration but also provides more sites for capture and dispersion of WO x species, thus mediating and improving the Lewis and Brønsted acid sites and reducibility of catalyst. XPS and DFT calculations further demonstrate that electronic interaction between WO x and Cu-doped CeO 2 is enhanced duo to the existence of interactions of short-range Ce-O-Cu and Ce-O-W. Moreover, the NH 3 -SCR reaction over WO x /Cu-CeO 2 may follow both Langmuir-Hinshelwood and Eley-Rideal reaction pathway according to the in situ DRIFTS.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2021
·Vol. 39
·期 5
·1310-1318
·
IF 6
Jingyu Zhao,Yaru Li,Ping Na
Main observation and conclusion We reported a facile and green hydrothermal strategy to tailor the carbon dots layer (CDL) and oxygen vacancies (Vo) modified on TiO 2 , by using ascorbic acid as CDL precursor and Vo regulator. The amorphous CDL was uniformly coated on the surface of the as prepared CDL@TiO 2– x composites by Ti-O-C bond. With the increase of carbon content, the amorphous CDL gradually became thicker, while the Vo concentration first increased and then decreased. 1.5 CDL@TiO 2– x possessed the highest Vo concentration. With the decoration of CDL and Vo, the photoreduction properties of CDL@TiO 2– x composites were significantly improved. Under simulated solar light and visible light, the reaction rates of 1.5 CDL@TiO 2– x were 9.6 times and 216 times higher than that of pure TiO 2 , respectively. Interestingly, the results discovered that CDL and Vo influenced the properties of CDL@TiO 2– x composites in different ways. The primary function of CDL was to improve the utilization of solar light, and the enhancement of the charge transfer ability was decided by Vo and CDL together. Our work provides a new strategy for the modification of TiO 2 and sheds new light on the respective role of CDL and Vo when they coexist in the catalyst.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Fengyin Zhou,Hongya Wang,Shiyu Wang,Jingjing Zhao,Xin Qu,Danfeng Wang,Yuqi Cai,Zhiyu Zheng,Dihua Wang,Huayi Yin
Waste biomass is one of the promising feedstocks to supply syngas that can be used as fuels, chemicals, reductants, etc. However, the relationship between the component of biomass and the constituent of pyrolysis gas remains unclear. Here, we study the pyrolysis behaviors of various biomasses and reveal the relationship between the biomass components and gas compositions. Further, different pyrolysis gases are applied for the reduction of spent lithium cobalt oxide (LiCoO2) below 500 °C. The pyrolysis gas with a higher concentration of CO has a higher reductivity to convert LiCoO2 to CoO and Li2CO3 with a conversion rate close to 100% in 1 h at 500 °C. The biomass rich in cellulose and with a lower content of lignin tends to produce pyrolysis gas with a high concentration of CO, which comes from the deliberate breakdown of carboxyl, carbonyl, ether, and ester linkages. Moreover, LiCoO2 exerts catalytic functions over the deoxygenation and enhancement of oxygenates and single-ring aromatics. Overall, this paper offers a tailored approach to regulating biomass pyrolysis gases, enabling highly efficient battery recycling and syngas production.
研究领域:
能源科学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jinwei Qin,Peng Zhao,Jie Meng,Shixiang Zuo,Xiaohui Wang,Wei Zhu,Wenjie Liu,Jingwei Liu,Chao Yao
Higher specific surface area and abundant surface oxygen vacancies are considered to be essential to the catalytic combustion. Herein, we elaborately fabricated an innovative catalyst on the basis of LaMnO 3 @Co 2 MnO 4 under a controllable selective dissolution (SD) treatment for ethane catalytic combustion. La element in perovskite could effectively protect the spinel system as a sacrifice, with MnO 2 covering on the spinel surface, thereby enhancing the activity and stability. In combination with XPS, in-situ DRIFT and various characterization results, this acid corrosion could provide induce better reducibility, larger specific surface area, higher Mn 4+ and Co 3+ content and more oxygen vacancies , which played a significant role in promoting the adsorption, activation and decomposition of ethane. Among all as-prepared catalysts, the optimal performance for catalytic ethane combustion was achieved on LMO@CMO-10 catalyst. The T 90 of LMO@CMO-10 was 341 °C under space velocity of 80,000 mL·g −1 ·h −1 . This work not only fabricated the catalyst system with higher specific surface area and more oxygen vacancy by SD method, but also provided a potential strategy for the preparation of highly active catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Hanchen Wang,Yichao Xue,Shiying Yang,Yang Li,Qianfeng Li
The oxidation performance of the zero-valent aluminum (ZVAl)/persulfate (PS) combined system had been studied by researchers in the past, which relied on the activation of PS by ZVAl to generate potent oxidizing radicals (•OH and SO 4 •- ) to degrade pollutants. However, ZVAl is a strong reductant and its reduction effect cannot be ignored. The reductive performance of the ZVAl/PS combined system is still unknown. Therefore, carbon tetrachloride (CT), an antioxidant organic pollutant , was selected as the target pollutant to test the reductive performance of the ZVAl/PS system in this study. We found a significant synergistic effect between ZVAl and PS, and the ZVAl/PS combined system could rapidly degrade CT in a wide pH range of 3–11 after an induction period. By SEM-EDS, TEM, XPS, and XRD analysis, it was found that PS could promote the corrosion of the oxide film on the ZVAl surface. The quenching experiment proved that PS could accept the electrons released from ZVAl to produce superoxide radical anion (O 2 •- ), which led to the degradation of CT rather than the oxidative process by •OH and SO 4 •- . The hydrogen evolution experiment indicated that electronic reduction might play a secondary role in CT degradation. In conclusion, our study further explored the reductive performance of the ZVAl/PS combined system and expanded the pathway of CT degradation without any organic solvent addition, which provides a new strategy for the efficient degradation of refractory halogenated organic pollutants.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Lulu Qi,Kaiyue Dong,Tian Zeng,Jingyi Liu,Jun Fan,Xiaoyun Hu,Wanli Jia,Enzhou Liu
Red phosphorus with three-dimensional nanostructure (3D-RP) was prepared by a hydrothermal method using commercial micron-sized RP as precursor. The investigation indicates that 3D-RP can harvest most of the visible light (Eg = 1.79 eV) and the BET surface area can reach 54.3 m 2 /g. It is interesting that 3D-RP exhibits quick adsorption property for methylene blue (MB) during the static adsorption experiment. Besides, Au and Cu ions can be adsorbed and reduced to their metallic states over the surface of 3D-RP without adding any reducing agent. Au and Cu species can greatly improve the photocurrent intensity and the photocatalytic hydrogen production efficiency of 3D-RP. This work is the primary investigation on the element phosphorus photocatalyst, further work should be conducted to explore more interesting properties about nano-sized RP.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 410
·期 1
·79-89
·
IF 3.431
Ding Manman,Guan Zhaobing,Cai Hongwei,Huang Yiyong,Lin Yawei,Hu Xiaosong
Derivatization of carbohydrates with aminooxy agents to form oximes can be used for qualitative and quantitative analysis of carbohydrates; however, the formation of isomeric products limits its application. A new reductive oxyamination procedure developed for the analysis of monosaccharides with a novel fluorescent O-substituted aminooxy reagent, 4-((aminooxy)methyl)-6-chloro-7-hydroxycoumarin (AOCC), is reported. In this procedure, monosaccharides undergo an oxime formation reaction with AOCC and are then readily reduced with 2-picoline–borane, followed by analysis with high-performance liquid chromatography with fluorescence detection. Good separation of five monosaccharide derivatives was achieved within 40 min with acetonitrile–water–tetrahydrofuran as the mobile phase. The detection limits were on the order of femtomoles. The linear range was 0.2–4000 nM, with a good correlation coefficient ( R ≥ 0.9985). Furthermore, the method was applied for analysis of real samples, such as bovine milk powder, without complicated and tedious sample treatment. This reductive oxyamination method circumvents the problem caused by oxime isomers and can be used for the highly sensitive and selective analysis of monosaccharides with high accuracy, providing an effective and promising method for the analysis of carbonyls with aminooxy agents.
研究领域:
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Qing Cao,Biwu Chu,Peng Zhang,Qingxin Ma,Jinzhu Ma,Yuan Liu,Jun Liu,Yaqi Zhao,Hong Zhang,Yonghong Wang,Hong He
Nitrate photolysis is a vital process in secondary NOx release into the atmosphere. The heterogeneous oxidation of SO2 due to nitrate photolysis has been widely reported, while the influence of SO2 on nitrate photolysis has rarely been investigated. In this study, the photolysis of nitrate on different substrates was investigated in the absence and presence of SO2. In the photolysis of NH4NO3 on the membrane without mineral oxides, NO, NO2, HONO, and NH3 decreased by 17.1, 6.0, 12.6, and 57.1% due to the presence of SO2, respectively. In the photolysis of NH4NO3 on the surface of mineral oxides, SO2 also exhibited an inhibitory effect on the production of NOx, HONO, and NH3 due to its reducibility and acidic products, while the increase in surface acidity due to the accumulation of abundant sulfate on TiO2 and MgO promoted the release of HONO. On the photoactive oxide TiO2, HSO3–, generated by the uptake of SO2, could compete for holes with nitrate to block nitrate photolysis. This study highlights the interaction between the heterogeneous oxidation of SO2 and nitrate photolysis and provides a new perspective on how SO2 affects the photolysis of nitrate absorbed on the photoactive oxides.
研究领域:
大气化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Biyun Fang,Zeliang Qi,Fangming Liu,Chuanfeng Zhang,Chunyan Li,Jun Ni,Jianxin Lin,Bingyu Lin,Lilong Jiang
The development of efficient oxides-supported bimetallic catalysts is critical for ammonia synthesis or other catalytic reactions. Herein, the design of ceria-supported Co-Mo bimetallic catalysts with different properties is performed by changing Mo addition to enhance the ammonia synthesis activities. It is found that the reduction of ceria and molybdenum oxide would be boosted by Co species, but the reduction of the bimetallic catalyst would be inhibited by the aggregated molybdenum oxide for the catalyst with Co and Mo simultaneous addition. On the contrary, this ill effect of molybdenum oxide on the reduction of the bimetallic catalyst can be effectively alleviated by the subsequent addition of Mo species to ceria-supported Co catalyst, resulting in enhancement of the proportion of Co metal, Ce 3+ and low-valent Mo species, as well as surface enrichment of Co species. In such cases, the amount of the adsorbed hydrogen and nitrogen species would increase, and hydrogen species preferentially desorbs following a pathway of H 2 formation. As a result, the catalyst obtained by the separate addition of Co and Mo shows 2.5-fold more active than its counterpart with the simultaneous addition of Co and Mo species. These findings provide a valuable insight in designing reducible oxide-supported bimetallic catalysts in ammonia synthesis or other hydrogen-involved reactions.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Lin Dong,Zhiqiang Fang,Qianbo Yuan,Yong Fan,Yong Yang,Ping Wang,Shixiong Sheng,Yanqin Wang,Zupeng Chen
Many strategies have been proposed to produce arenes from lignin as liquid fuel additives. However, the development of these methods is limited by the low yield of products, low atom utilization, and inefficient lignin depolymerization. Herein, we develop an energy-efficient synthetic method for the production of high-carbon-number arenes from sustainable lignin with a total yield of 23.1 wt%. Particularly, high carbon number arenes are obtained by fully utilizing the formaldehyde stabilizing additive and the methoxy group in lignin. The process begins with the reductive depolymerization of formaldehyde-stabilized lignin, followed by transmethylation between lignin monomers over Au/Nb 2 O 5 catalyst, and the Ru/Nb 2 O 5 -catalyzed hydrodeoxygenation. This work demonstrates the potential of value-added arenes production directly from lignin.
研究领域:
生物化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Zhong Ma,Chuan Yuan,Shuai Zhang,Yonggang Lu,Junhui Xiong
Chemical looping combustion (CLC) is a clean and efficient flame-free combustion technology, which combust the fuels by lattice oxygen from a solid oxygen carrier with inherent CO 2 capture. The development of oxygen carriers with low cost and high redox performance is crucial to the whole efficiency of CLC process. As the solid by-product from the sulfuric acid production, pyrite cinder presented excellent redox performance as an oxygen carrier in CLC process. The main components in pyrite cinder are Fe 2 O 3 , CaSO 4 , Al 2 O 3 and SiO 2 in which Fe 2 O 3 is the active component to provide lattice oxygen. In order to systematic investigate the functions of supports (CaSO 4 , Al 2 O 3 and SiO 2 ) in pyrite cinder, three oxygen carriers (Fe 2 O 3 -CaSO 4 , Fe 2 O 3 -Al 2 O 3 and Fe 2 O 3 -SiO 2 ) were prepared and evaluated in this study. The results showed that Fe 2 O 3 -CaSO 4 displayed high redox activity and cycling stability in the multiple redox cycles. However, both Fe 2 O 3 -Al 2 O 3 and Fe 2 O 3 -SiO 2 experienced serious deactivation during redox reactions. It indicated that the inert Fe-Si solid solution (Fe 2 SiO 4 ) was formed in the spent Fe 2 O 3 -SiO 2 sample, which decreased the oxygen carrying capacity of this sample. The XPS results showed that the oxygen species on the surface of Fe 2 O 3 -CaSO 4 could be fully recovered after the 20 redox cycles. It can be concluded that CaSO 4 is the key to the high redox activity and cycling stability of pyrite cinder.
研究领域:
能源科学
·
材料科学
✓ 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）