JOURNAL OF CATALYSIS
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2023
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IF 7.3
Liyong Ding,Yukun Zhao,Youji Li,Chengsheng Ge,Liang Lv,Hongwei Ji,Wenjing Song,Chuncheng Chen,Jincai Zhao
During TiO 2 -based photocatalysis, the presence of water usually leads to the unselective degradation of organic compounds due to the uncontrollable formation of water-derived radical species. Here we report that the presence of water dramatically enhances the selectivity in photocatalytic oxidation of sulfides to sulfoxides over TiO 2 . H 2 18 O-isotope labelling experiments reveal that both O 2 and H 2 18 O contribute to the oxygen atoms in the formed sulfoxides and sulfones. Moreover, at the beginning of the oxidation of sulfides, water serves as the main source of the oxygen atom, while the contribution of O 2 increases with the irradiation time. We uncover two roles of water in sulfides oxidation: to act as oxygen source in the oxidation of sulfides to sulfoxides; to provide protons to inhibit the further oxidation of sulfoxides. This study deepens our understanding of roles of water in photocatalytic oxidation of sulfides and offers a new strategy to optimize photocatalytic selective oxidation .
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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产品关联
DOI
高影响因子
Chemical Engineering Journal Advances
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2022
·
IF 0
Na Yuan,Hongchao Li,Jieshu Qian
Determination of the concentration of peracetic acid (PAA) in the presence of H 2 O 2 is a great challenging problem due to the similar chemical behaviors of the two species. In this study, we developed a new method for simultaneous measurement of PAA (0.5 – 10.0 μM) and total peroxides (i.e., PAA and H 2 O 2 with a molar ratio of 10:6.5), based on the catalytic oxidation of ABTS by separately using Co(II) and peroxidase (POD) as the catalysts. Owing to the unique catalytic activity of Co(II) towards PAA, the coexistent H 2 O 2 exhibits negligible effect on the determination of PAA. The value of absorbance at 415 nm increases linearly with increasing the concentration of PAA or total peroxides, and the sensitivities for PAA and total peroxides are as high as 5.31 × 10 4 and 9.07 × 10 4 M −1 cm −1 , respectively. In addition, the proposed ABTS method shows excellent feasibility and applicability, which make it suitable to be employed for detection in complicated water matrices.
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
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IF 11.3
Shouhao Tong,Hongyan Wei,Junming Zhou,Yixuan Yang,Runliang Zhu,Qingze Chen,Xiande Xie,Qing Hu,Michael F. Hochella Jr.,Jing Liu
Heterogeneous crystallization of manganese (oxyhydr)oxides (MnOx) on iron (oxyhydr)oxides (FeOx) is crucial for the biogeochemical cycling of Mn, yet atomic-level insights into this process are important but relatively limited. Herein, we revealed the distinct adsorption, oxidation, and crystallization mechanisms of Mn on hematite (Hem), ferrihydrite (Fhy), and goethite (Gth). Gth exhibited highest ability in Mn(II) removal and oxidation, followed by Hem and Fhy. Manganite and hausmannite were the main MnOx products with distinct proportions, and morphologies cross the systems. MnOx growth mechanisms involve surface-induced nucleation, crystallization by particle attachment (CPA), and self-catalyzed growth. On Fhy, self-catalyzed growth was dominant; for Gth, surface-induced nucleation was prevalent, supplemented by CPA; and Hem combined all three mechanisms. These distinct mechanisms led to nanoparticles primarily of hausmannite on Gth and nanowires of manganite and hausmannite on Hem and Fhy, with those on Hem displaying lower aspect ratios. Differences in MnOx structure and morphology were attributed to Mn(II)-FeOx complexation, FeOx electronic band structure, and crystal structure mismatch between MnOx and FeOx, which respectively influenced the direct and indirect electron transfer and heterogeneous nucleation efficiency. This work advances our understanding of MnOx crystallization on FeOx at the nanoscale, explaining the diverse morphology and structure of MnOx in different environments.
研究领域:
环境科学
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材料科学
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地球化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
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IF 7.5
Zihao Hu,Xiaoying Zhou,Tiantian Zhang,Zuliang Wu,Jing Li,Wei Wang,Erhao Gao,Jiali Zhu,Shuiliang Yao
Catalytic combustion has been considered the effective way to oxidize carbon monoxide (CO). It is both crucial and challenging to develop highly-active monolithic catalysts at lower temperatures for industrial applications. This study synthesized a monolithic Co 3 O 4 /Mn 3 O 4 -NF catalyst by the generation of in-situ metal–organic framework (MOF-74)-derived Co 3 O 4 /Mn 3 O 4 on nickel foam (NF). The resulting Co 3 O 4 /Mn 3 O 4 -NF catalyst demonstrated superior low-temperature CO oxidation performance, and the T 90 temperature was 20 °C. The enhanced activity is associated with the increased oxygen vacancy concentration, abundant Co 3+ , Mn 2+ + Mn 3+ , and surface-adsorbed oxygen species (O ads ), as well as low-temperature reducibility. In addition, operando DRIFTS analysis revealed that the surface of this as-prepared catalyst possessed abundant terminal-type oxygen (M O), facilitating CO adsorption and catalytic oxidation. This pioneering study introduces a paradigm-shifting insight: the effectiveness of non-noble metal oxide catalysts can now compete with, and in some cases, outperform their noble metal counterparts. This breakthrough is set to transform the industry, presenting a compelling alternative to conventional noble metal catalysts and propelling the evolution of state-of-the-art environmental conservation technologies.
研究领域:
催化材料
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2018
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IF 3.649
Manman Jin,Jinkai Wang,Bing Wang,Zhenmei Guo,Zhiguo Lv
A simple and eco-friendly approach for green oxidation of aldehydes has been proposed, which employed highly efficient heterogeneous catalysts tungsten-doped modified silica SBA-15 (W-SBA-15) as catalysts and H 2 O 2 as a green oxidant. W-SBA-15 were synthesized by immobilizing tungsten species on modified SBA-15 and first used in the aldehydes oxidation reaction. W-SBA-15-APTS (0.002 g, APTS, a kind of modifier) displayed an equivalent catalytic activity comparable to that of homogenous catalyst (H 2 WO 4 , 0.5 g) and maintained excellent catalytic activity over 20 cycles. The pore diameter, ca . 7.94–9.14 nm, of W-SBA-15 provides a suitable mesoscopic environment for the substrate, and the product can diffuse freely during the oxidation of glutaraldehyde (GA). Effective but different catalytic performance of W-SBA-15 for the oxidation of other aldehydes suggests the universal applicability of W-SBA-15. The possible mechanism of the oxidation state of tungsten species in W-SBA-15-APTS was proposed; tungsten species are not only attached to APTS but also incorporated into the framework of SBA-15.
研究领域:
化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Shijia Pan,Wenxuan Jiang,Lu Tian,Xiang Li,Jiaxin Wang,Yawen Wang,Zhen Li,He Guo
The simultaneous presence of antibiotics and phosphate (P) in wastewater will threaten human health and ecological security. The purpose of this study is to study the simultaneous removal of oxytetracycline (OTC) and P in water by O 3 /CaO 2 advanced oxidation process. With enhancing CaO 2 dosage, the degradation efficiency of OTC first improved and then declined, whereas the removal efficiency of P kept increasing. Increasing the amount of O 3 increased the removal efficiency of OTC, but had little effect on the removal efficiency of P. With 0.80 g/L CaO 2 and 0.50 g/h O 3 , the removal efficiency of OTC and P reached 98.0 % and 90.5 % respectively. The lower OTC concentration was beneficial to OTC degradation and P precipitation. The P concentration has no effect on OTC degradation, but it would affect itself precipitation. Alkaline environment was conducive to OTC degradation and P removal. ·OH, ·O 2 − , 1 O 2 made major contribution to the degradation of OTC, which was verified by ESR technique and free radical capture experiment. During the degradation of OTC and P removal, TOC and COD values decreased, while pH and conductivity showed a downward trend. Based on UV–Vis spectrum, 3D EEMF spectrum and LC-MS analysis, two main degradation pathways of OTC were proposed. Toxicity analysis of intermediates showed that their toxicity was significantly lower than that of OTC. The O 3 /CaO 2 system can be considered as an efficient and prospective method for the simultaneous removal of OTC and P in water.
研究领域:
环境科学
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水处理工程
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生物学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Yong-Ze Lu,Jing Han,Wei-Jia Zhang,Ji Sun,Xin Li,Zhong-lian Yang,Jun-Ling Yang,Shu-Ping Li,Guang-Can Zhu
At high altitude, wastewater aeration efficiency is low, which is detrimental to nitrification in conventional biological nitrogen removal. The combined partial nitritation and anaerobic ammonium oxidation (CPNA) process requires little oxygen and can be appropriate in low-pressure conditions. As such, in this study, we investigated the effect of air pressure on CPNA using a laboratory-scale reactor. We found that low air pressure promoted the removal of total inorganic nitrogen (TIN), achieving a TIN removal rate of 43,000 mg·N/(kg·VSS·d). The secretion of extracellular polymeric substances under low air pressure was not significantly different from that under ordinary air pressure, indicating no adverse effects on microbial aggregation ability, stability, or settleability. The abundance of aerobic ammonia-oxidizing bacteria (AeAOB) increased from 0.2% to 5.6%, and the activity of anaerobic ammonia-oxidizing bacteria (AnAOB) enhanced, giving AeAOB and AnAOB a competitive advantage over nitrite-oxidizing bacteria, thus forming a microbial community structure favorable to the CPNA process. Our further analysis of the results of batch tests in serum bottles confirmed the positive effect of low air pressure on the anaerobic ammonium oxidation (anammox) process, with a 28.5% ± 1.9% improvement in the specific anammox rate at 70 kPa compared with 100 kPa. AnAOB activity increased, which was reflected in the intracellular heme content increasing from 0.56 ± 0.18 μmol/(g·VSS) at 100 kPa to 2.56 ± 0.20 μmol/(g·VSS) at 70 kPa. We clarified the CPNA-process-promoting effect of low air pressure, which shows potential for nitrogen removal in high-altitude regions.
研究领域:
环境工程
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微生物学
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污水处理
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Muguli Muhaxi,Fang Liu,Tzi Bun Ng
In the present study, three novel antioxidant polysaccharides (G-1, AG-1, and AG-2) were isolated and purified from Pleurotus ferulae using mouse erythrocyte hemolysis inhibitory activity as an indicator. These components showed antioxidant activity at the chemical and cellular levels. Given that G-1 displayed superior performance in protecting the human hepatocyte L02 cells against oxidative damage caused by H 2 O 2 compared to AG-1 and AG-2 and had a higher yield and purification rate, the detailed structure of G-1 was further characterized. G-1 mainly contains six kinds of linkage type units as A: →4,6)-α- d -Glcp-(1→, B: →3)-β- d -Glcp-(1→, C: →2,6)-β- d -Glcp-(1→, d : β- d -Manp(1→, E: →6)-β- d -Galp-(1→, F: →4)-β- d -Glcp-(1→. Finally, the potential in vitro hepatoprotective mechanism of G-1 was discussed and elucidated. Results suggested that G-1 can protect L02 cells from H 2 O 2 -induced damage by reducing the leakage of AST and ALT from the cytoplasm, enhancing the activities of SOD and CAT, and suppressing lipid peroxidation and production of LDH. G-1 could further reduce the production of ROS, stabilize mitochondrial membrane potential and maintain cell morphology. Hence, G-1 could be a valuable functional food with antioxidant and hepatoprotective activities.
研究领域:
真菌学
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药理学
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
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2021
·Vol. 11
·期 24
·14517-14526
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IF 3.361
Yangbin Peng,Ying Ren,Hao Zhu,Yu An,Baisong Chang,Taolei Sun
Reactive oxygen species (ROS) as a key messenger of signal transduction mediate physiological activities, however, oxidative stress produced by excessive ROS can cause the destruction of cell homeostasis, which will result in a series of diseases. Therefore, effective control of ROS level is critical to the homeostasis of the cell. Here, we reported that glutathione (GSH)-stabilized copper nanoclusters (CuNCs) with about 9 Cu atoms can functionally mimic three major antioxidant enzymes, namely catalase (CAT), glutathione peroxidase (GPx) and superoxide dismutase (SOD). The rate of H2O2 decomposition was calculated to be ∼0.23 mg L−1 s−1 when the concentration of CuNCs was 100 μg mL−1. The SOD-like activity by catalyzing the disproportionation of superoxide to H2O2 and O2 reached 25.6 U mg−1 when the effective inhibition rate was ∼55.4%. Intracellular ROS scavenging studies further identified that CuNCs can obviously protect cells from oxidative stress and the cell viability recovered to above 90%. Hence, we expect that ultrasmall CuNCs will provide good therapeutic potential in the future treatment of ROS-related diseases.
研究领域:
纳米技术
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生物化学
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分子生物学
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医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2023
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IF 5.7
Tianli Sun,Ye Wu,Jian Mei,Hang Zhu,Kun Qian,Dong Liu
Using oxygen carrier to relieve uneven mixing of fuel and air under harsh conditions (high temperature and short residence time) is a promising strategy to improve fuel efficiency. In this paper, a range of cerium modified ferric oxide oxygen carriers with excellent redox capability and stability was fabricated to investigate the ethylene rapid oxidation performance and the gas–solid surface reaction of ethylene and iron oxide was studied with density functional theory. The experimental results show that the oxygen carrier with the mole ratio of ferrum : cerium is 9:1 performed the best ethylene oxidation characteristic, because the addition of cerium improved oxygen vacancy capacity to enhance the oxidation for ethylene and its pyrolysis products, which was also confirmed with density functional theory study. Due to the role of both, the ethylene and its pyrolysis products were converted into carbon dioxide and water quickly and effectively (carbon dioxide yield >92%).
研究领域:
化学工程
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材料科学
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能源技术
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催化
✓ 已验证
产品关联
DOI
高影响因子
Science China-Technological Sciences
·
2022
·Vol. 65
·期 10
·2317-2324
·
IF 3.903
Gao HongMei,Xiao MeiLing,Li GuoQiang,Gao LiQin,Meng QingLei,Luo ZhaoYan,Luo ErGui,Liu ChangPeng,Jin Zhao,Ge JunJie,Xing Wei
The material innovation is prerequisite to accelerating sluggish oxygen evolution reaction (OER) kinetics, thus promoting the realization of hydrogen energy community. Herein, we develop an oxygen-vacancy-rich TiO 2 supported RuO 2 catalyst (RuO 2 @r-TiO 2 ) towards improved OER activity and stability. The oxygen vacancy on TiO 2 not only supplies electrons to produce lower valence Ru, but also provides sufficient anchoring site for the deposition of RuO 2 nanocrystal. Beyond that, it can generate strong electronic interaction between TiO 2 and supported RuO 2 , and thereby tailors the intermediates’ adsorption energy on the RuO 2 surface. As a result, the derived RuO 2 @r-TiO 2 catalyst exhibits superior OER activity and stability with the overpotential of 211 mV at a current density of 10 mA cm −2 and negligible activity degradation after 6 h operation, outperforming the non-oxygen-vacancy counterpart (223.3 mV, 12.75% activity loss) and RuO 2 catalyst (234.6 mV, 42.86% activity loss).
研究领域:
材料科学
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电化学
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催化化学
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能源材料
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纳米科技
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物理化学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2019
·Vol. 7
·期 9
·1900374
·
IF 3.163
Zhong Ma,Dewang Zeng,Shuai Zhang,Rui Xiao
NiFe 2 O 4 oxygen carrier (OC) presents higher oxygen carrying capacity than single metal oxides (NiO and Fe 2 O 3 ). However, the redox ability of NiFe 2 O 4 gets deactivated due to phase segregation. Herein, the investigation of the effect of supports (CeO 2 , CeZrO 2 , and ZrO 2 ) on the phase stability and the redox performance of NiFe 2 O 4 during the chemical looping (CL) process are presented. The structure of NiFe 2 O 4 -based OCs is characterized using different characterization methods. The CL reaction is conducted in a fixed-bed reactor at 900 °C under alternate 5% CO/N 2 and 5% O 2 /N 2 atmospheres. The results indicate that the redox performance and the phase stability of NiFe 2 O 4 -based OCs are significantly affected by the supports. According to experimental results, CeO 2 can improve the oxygen mobility of NiFe 2 O 4 . The CeO 2 –NiFe 2 O 4 OC has the best performance in terms of both recyclability and phase stability during the redox cycles. The results show that CeO 2 –NiFe 2 O 4 can reduce the tendency of Fe segregation due to the high concentration of oxygen vacancies. It can be reduced and reoxidized to the original crystalline phase of NiFe 2 O 4 . Nevertheless, the CeZrO 2 –NiFe 2 O 4 and ZrO 2 –NiFe 2 O 4 OCs have drawbacks related to serious sintering and phase segregation into Fe 2 O 3 .
研究领域:
材料科学
·
化学工程
·
能源化学
·
催化化学
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）