JOURNAL OF CATALYSIS
·
2017
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IF 6.844
Fengyu Xie,Huali Wu,Jirong Mou,Dunmin Lin,Chenggang Xu,Cong Wu,Xuping Sun
It is of great importance to design and exploit high-efficiency low-cost electrocatalysts for the oxygen evolution reaction (OER) under mild conditions for applications. In this Article, we propose that formation of a thin amorphous Ni carbonate layer on Ni 3 N nanoarray supported on carbon cloth (Ni 3 N NA/CC) is an effective strategy to boost its OER activity in at near-neutral pH. When used as a 3D non-noble-metal OER electrocatalyst, the resulting core–shell Ni 3 N@Ni-Ci NA/CC displays superior catalytic activity with extremely small overpotential of 400 mV for 20 mA cm −2 in 1.0 M KHCO 3 (bulk pH: 8.3). Moreover, it also exhibits considerable long-term electrochemical durability with its activity being preserved for at least 12 h. Conductive Ni 3 N nanoarray not only provides as the Ni source for in-situ electrochemical derivation of 3D Ni-Ci catalyst with high surface area, more exposed active sites and facilitated mass diffusion, but effectively prompts the electron transport from Ni-Ci shell to CC, enabling more efficient water oxidation electrocatalysis.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
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IF 5.091
Jinsuo Gao,Shouchun Wu,Yanling Han,Feng Tan,Yong Shi,Mengyao Liu,Xinyong Li
Increasing the amount of surface active sites of the material may be a feasible way to improve the efficiency of the generation of Fe 2+ in the photo-Fenton process. In this work, a simple synthesis method was adopted to synthesize 3D ordered mesoporous CuFe 2 O 4 with large specific surface area by using ferric nitrate and copper nitrate as the precursor and KIT-6 as the template. The synthesized materials were characterized by nitrogen adsorption-desorption, XRD , TEM , FT-IR and UV–vis DRS . The catalytic properties of the mesoporous material were thoroughly evaluated by activating hydrogen peroxide to remove sulfonamides in near neutral water. Some of the reaction factors, such as the dose of hydrogen peroxide, catalyst usage and pollute concentration, were cautiously tested and discussed. When the catalyst dose is 0.2 g/L, the substrate concentration is 10 mg/L and the concentration of hydrogen peroxide is 10 mM, sulfamethoxazole is almost completely transformed within two hours and its mineralization level reached 31.42%. In the further study of mechanism, hydroxyl radical is proved to be the main active free radical based on EPR . Moreover, mesoporous copper ferric has good circulation, which indicates that it may have excellent application in the field of photo-Fenton.
研究领域:
环境科学
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材料科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Tong Wen,Yunliang Zhao,Xiangke Jiao,Qiwu Zhang,Tingting Zhang,Xian Zhang,Jun Qu,Yan Dong,Shaoxian Song
In this work, a novel method of mechanochemistry is used to directly prepare high-performance Ni-Fe based catalysts for oxygen evolution reaction (OER) in an environmental-friendly borate electrolyte with near-neutral pH. Such a procedure is simple, effective, and time-saving. The effect of iron-based raw materials and mechanochemical reaction on OER of catalysts are investigated. It shows that iron nitrate nonahydrate is the best iron resource compared to iron hydroxide and iron oxide due to amorphous iron species in catalysts for strengthening the “Fe inductive effect” and generating active Ni species with high valence. Besides, the grinding time can control the mechanochemical reaction from mixed reaction to solid reaction in the catalyst synthesis process. When the time is 30 min, the catalyst is composed with amorphous Ni(OH) 2 and the precursors of NiFe-LDH. This catalyst only needs 413 mV overpotential to reach 1 mA cm −2 in 0.1 M K-Bi (pH=9.2), which is better than precious RuO 2 . It is proven that the mechanochemical approach is an alternative method for synthesizing superior OER catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Wei Ding,Weilong Xiao,Huaili Zheng,Shixin Zhang,Hongxia Liu,Yanyan An,Rui Zhao
The desulfurization by-product (e.g. sulfite) treatment and water pollution are two widespread concerns, while the sulfite activation by transition metals can be adopted to solve both of them simultaneously. In this study, a silica-supported cobalt catalyst (CoSi) was used to activate sulfite for the degradation of organic pollutants in an electrochemical system (the EC/CoSi/sulfite system), which demonstrated remarkable water treatment efficiencies due to sulfate radical oxidation. The synergy mechanisms of the EC/CoSi/sulfite system were revealed. (i) The as-prepared CoSi played the dual roles as an electro-adsorbent and a catalyst for sulfite activation. (ii) The electrolytic oxygenation supported the conversion of cobalt species and the chain reactions of oxysulfur radicals. (iii) The anodic oxidation of sulfite also generated oxysulfur radicals. The influencing factors and operating parameters were investigated and optimized systematically. Moreover, the efficient degradation of highly concentrated X-3B and non-selective oxidation of various organic compounds confirmed the promising application of the EC/CoSi/sulfite system in practical water treatment. Overall, the EC/CoSi/sulfite system created new value of the industrial waste (e.g. sulfite) for further application in the environmental remediation.
研究领域:
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Hongzhi Gu,Qingwei Huang,Jinli Zhang,Wei Li,Yan Fu
Heparin serves as both reductant and stabilizer for biogenic synthesis of ultrasmall Pt nanoclusters. The surface remaining heparin enhances the affinity of Pt nanoclusters with the substrate 3,3′,5,5′-tetramethylbenzidine, thereby contributing to outstanding peroxidase mimicking activity in near-neutral media. Heparin-reduced Pt nanoclusters exclusively exhibit peroxidase mimicking activities without oxidase-like characteristics. The most efficient Pt nanozyme was reduced at 80 °C by adopting the [K 2 PtCl 4 ]/[heparin] of 1, showing the K m of 165 mM for H 2 O 2 and 0.016 mM for TMB. This developed Pt nanozyme displays a marked superior in both peroxidase-like activity and peroxidase specificity under near-neutral environment over previously reported Pt nanozymes. Based on these two considerable features of heparin-Pt nanozyme, a colorimetric test was developed for directly monitoring glucose at pH 6. This work proposes an efficient way to construct peroxidase mimetics at near-physiological pH without the interference of dissolved oxygen.
研究领域:
纳米技术
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生物化学
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材料科学
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分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 2
·027503
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IF 3.9
Jingchao Chen,Jie Yang,Ruimin Ding,Shanshan Liu,Lifang Chen,Wenwen Shi,Xi Yin
Electrochemical hydrogen peroxide (H2O2) sensors are valuable tools in biological research and industrial applications for in situ monitoring H2O2 levels with the advantages of simplicity, portability, rapid response, and low cost. Herein, we demonstrate a novel electrochemical sensing platform based on Fe- and N-doped C composite (Fe–N–C) modified electrodes for sensitive detection of H2O2. This platform showed an excellent response to H2O2 reduction in near-neutral pH solutions with a low reduction potential and high sensitivities. The results of site-poisoning experiments suggest that the atomically dispersed Fe–Nx sites, which resemble the peroxidase-type enzymes, contribute to the high activity of the Fe-N-C catalyst for the H2O2 reduction reaction. Further, we developed a screen-printed electrode (SPE) modified with Fe–N–C with excellent electrocatalytic performances, including a favorable sensitivity (24.95 ± 0.77 μA μM−1 cm−2) and a low detection reagent (40 μl solution). Moreover, the as-prepared Fe–N–C/SPE was successfully applied to H2O2 sensing in an actual milk sample, with good recovery (between 98% and 102%). The as-prepared Fe–N–C/SPE sensor also exhibits superior selectivity, stability, and reproducibility, making it a promising candidate as a portable platform for H2O2 analytes, further improving its practical H2O2 sensing applications.
研究领域:
生物传感技术
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Ling Zhao,Yi Sun,Dionysios D. Dionysiou,Ying Teng
The application of reductants to accelerate the transformation from Fe(III) to Fe(II) has been proposed as a strategy to overcome the rate limitations of Fenton and Fenton-like processes. However, this strategy has been given little consideration to date in ligand-modified homogeneous Fenton-like (LMF) processes. Therefore, this study investigated the roles of ordinary reductants, namely gallic acid (GA), ascorbic acid (AA), acetylacetone (AAc), and three kinds of sulfhydryl compounds (SHs), in a pyrophosphate-modified Fenton-like (PMF) process for degrading polychlorinated biphenyls (PCBs) under circumneutral pH conditions. Interestingly, the inhibitory effects of SHs/AAc, the promoting effect of AA , and the inhibitory following with promoting effects of GA were observed on PCB degradation in the PMF process. The decrease of PP-Fe complex reactivity with decrease of pH and the scavenging effect of SHs/AAc caused their inhibitory effects, while the high reducibility of AA resulted in its promoting effect. The inhibitory pathways of GA in the initial stage were similar to those of SHs/AAc, whereas its promoting effect in the later stage was ascribed to the ligand exchange between GA and PP and the reducibility of GA towards Fe 3+ ions at pH 3.0. Results obtained in aqueous and soil systems under optimal reaction conditions further reveal that the application of suitable reductants, particularly AA, readily facilitates the development of the PMF process for the removal of refractory organic pollutants in natural environments.
研究领域:
环境化学
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催化
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水处理
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污染物降解
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
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IF 3.7
Jiawei Liu,Guo Du,Tiehong Chen
Ordered mesoporous silica is widely used in catalysis, adsorption, and biomedicine, among which SBA-15 (Santa Barbara Amorphous-15) is one of the most widely studied. However, the synthesis of SBA-15 often requires strong acid (hydrochloric acid or sulfuric acid), which will not only corrode industrial equipment but also pollute the environment with the wastewater containing strong acid and halogen (sulfur). Here, we demonstrate a green synthetic strategy for SBA-15 under weakly acidic conditions through an anionic assembly route. With the assistance of poly(acrylic acid) (PAA) and 3-aminopropyltrimethoxysilane (APMS), the pH value of the synthesis system can be increased to 4–5, which is a mild near-neutral condition. In addition, halogen-free synthesis using organic acids is also achieved. The powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and N2 sorption characterizations show that the obtained SBA-15 has good texture properties, with a specific surface area of 430–500 m2/g and ordered 6–8 nm mesopores, which is similar to SBA-15 synthesized in traditional strong acid. This strategy provides a facile and environmentally friendly route for the large-scale production of ordered mesoporous materials.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）