JOURNAL OF LUMINESCENCE
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2018
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IF 2.732
YaoYao Qu,Guojuan Ren,Liying Yu,Baoya Zhu,Fang Chai,Lihua Chen
Herein, the fluorescent carbon dots (CDs) has been synthesized by hydrothermal method by using ethylene diamine tetraacetic acid (EDTA) as a raw materials. The prepared CDs exhibited bright blue fluorscence excited by 340 nm with the quantum yield as high as 52%. The CDs possess special fluorescence responses to 2-nitrophenol (2-NP) and 4-nitrophenol (4-NP), and the slump of fluorescence was demonstrated by CDs solution in the case of 2-nitrophenol and 4-nitrophenol existence. The detection limit of 2-NP and 4-NP was calculated at 77 nM and 60 nM, respectively. Meanwhile, the color response to 2-NP and 4-NP can be observed from achromatic solution to yellow by naked eye. All in all, the obtained CDs can be applied as fluorescence and colorimetric probe in environmental protection.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
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2025
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IF 3.2
Yulu Ye,Jiahang Zhou,Minqiang Xia,Yunbo Li
Membrane catalysts have garnered considerable attention in recent years owing to their outstanding stability, high recyclability, environmental compatibility, and convenience. Herein, nanogold membrane catalysts have been successfully fabricated with ultrathin gold nanowires in the presence of thiourea by a vacuum filtration deposition method aimed at facilitating charge transport and enhancing the catalytic performance. By maintaining the thiourea treatment concentration at 500 μg/mL, the catalytic time of the nanogold membrane remained below 1.0 min for 2-nitrophenol, specifically at 15 s. The 500 μg/mL thiourea-treated nanogold membranes are also capable of rapidly catalyzing the reduction of 4-nitrophenol, methylene blue, and methyl orange, causing their respective UV characteristic peaks to disappear expeditiously within 20 s. Overall, this novel method offers a simple and convenient approach to obtaining nanogold membrane catalysts, holding great potential promise for applications in materials, catalysts, and environment fields.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
高影响因子
CLAYS AND CLAY MINERALS
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2024
·Vol. 66
·期 5
·415-425
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IF 2
Honghai Wu,Zhenhao Song,Meixiang Lv,Dan Zhao,Guangping He
Many types of oxidative pollutants are dangerous chemicals and may pose a health risk, but an inexpensive and effective method for mitigating those risks would offer significant advantages. The objective of this study was, therefore, to investigate the potential for Fe-pillared montmorillonite to fill that gap. Surface mediated reduction reactions by ferrous species often play an important role in governing the transport, transformation, and fate of hazardous oxidative contaminants. Compared to the untreated montmorillonite (Mnt), the synthetic polyhydroxyl-Fe pillared montmorillonite (Fe-Mnt) was found to be somewhat similar to goethite in promoting the ability of specifically adsorbed Fe(II) to reductively transform 2-nitrophenol (2-NP). The 2-NP was efficiently removed within 30 min from solutions at the optimum neutral pH in a mixed reduction system of Fe(II)/Fe-Mnt under an anoxic atmosphere. This demonstrated that the specifically adsorbed Fe(II) of Fe-Mnt can enhance 2-NP reduction. The highly enhanced 2-NP reduction by Fe(II) through Fe-Mnt surface catalysis can, therefore, be ascribed to clearly increased amounts of an adsorbed Fe(II) species surface complex, which gave rise to enhanced Fe(II) reductive activity that enabled the rapid reduction of 2-NP. The reduction processes produced a faster transformation of 2-NP in a Fe-Mnt suspension than in a Mnt suspension. The transformation kinetics were described using pseudo-first-order rate equations. Moreover, in addition to the effects of mineral surface properties, the interactions were affected by the aqueous chemistry, and the removal rates of 2-NP were increased at pHs of 6.0–7.3. In the present study, the structure and surface reactivity of Fe-Mnt was characterized in depth. The polyhydroxyl-Fe added to Mnt and the pH were determined to be the two key controlling factors to mediate the reductive transformation of 2-NP in the presence of Fe-Mnt in comparison to goethite and Mnt. Finally, the catalysis mechanism responsible for the enhanced 2-NP reduction by Fe(II) was elucidated using cyclic voltammetry.
研究领域:
环境化学
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催化科学
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污染治理
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材料化学
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表面反应动力学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Fang Deng,Qian Zhang,Lixia Yang,Xubiao Luo,Aijie Wang,Shenglian Luo,Dionysios D. Dionysiou
Although Bi-based compounds are effective photocatalysts for degrading organic pollutants under visible-light irradiation, their visible-light photocatalytic activities are still low and far from practical application. In this study, novel graphene-functionalized Bi-bridge Z-scheme black BiOCl/Bi 2 O 3 (black BiOCl-Bi-Bi 2 O 3 /rGO) heterojunctions with oxygen vacancies were prepared via in situ Fe reduction of BiOCl/graphene oxide nanoplates. In comparison with BiOCl/graphene oxide nanoplates, the black BiOCl-Bi-Bi 2 O 3 /rGO heterojunctions have stronger visible-light absorption, and exhibit more efficient charge separation and higher visible-light photocatalytic activity in degrading 2-nitrophenol (2NP). The black BiOCl-Bi-Bi 2 O 3 /rGO 0.4 shows the highest visible-light photocatalytic activity with almost complete degradation of 2NP, which is attributed to proper bandgap match between black BiOCl and Bi 2 O 3 , multiple charge transfer channels via Bi-bridge and rGO, and efficient charge separation. Of special importance, black BiOCl-Bi-Bi 2 O 3 /rGO heterojunction can effectively treat real industrial wastewater with 70.3% COD removal efficiency, and it shows superior long-term stability. Additionally, a possible photocatalytic mechanism of black BiOCl-Bi-Bi 2 O 3 /rGO heterojunctions based on multiple charge transfer channels was proposed.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jianhao Qiu,Dingliang Dai,Lu Zhang,Guanglu Xia,Jianfeng Yao
Oxygen vacancy-rich Bi 2 MoO 6 nanoflakes were uniformly anchored on cuboid MIL-121 via benign solvothermal and thermal-reduction methods. Benefiting from the efficient light capture and rich electron traps triggered by oxygen vacancies, intimate interface contact and intrinsic heterostructure, the enhanced separation and transportation rates of photo-induced charge carriers are achieved. Consequently, Bi 2 MoO 6 /MIL-121 with rich oxygen vacancies performs excellent photocatalytic activities, which are 4.8, 7.1, 1.4 times higher for Cr(VI) reduction, and 6.1, 5.4, 1.2 times higher for 2-nitrophenol degradation compared with those of Bi 2 MoO 6 , MIL-121 and Bi 2 MoO 6 /MIL-121 without oxygen-vacancies, respectively. Furthermore, thanks to the timely consumption of photo-induced electrons and holes by Cr(VI) reduction and 2-nitrophenol degradation, respectively, the corresponding photocatalytic efficiencies are further boosted in their coexistent environment. This work would enlighten the design of metal-organic framework-based (photo)catalysts for the treatment of complicated pollution.
研究领域:
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
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2012
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IF 2.947
Fang Deng,Xubiao Luo,Ke Li,Xinman Tu,Shenglian Luo,Lixia Yang,Ninghui Zhou,Hongying Shu
Visible light responsive iron-doped TiO 2 (Fe 3+ /TiO 2 -IL) was synthesized by sol–gel method using 1-vinyl-3-propylimidazolium iodide (VPIM + I − ) as a reaction medium. VPIM + I − not only made the morphological and structural changes of Fe 3+ /TiO 2 -IL, but also extended its absorption edge to the visible light region. The photocatalytic activity of Fe 3+ /TiO 2 -IL was tested in the degradation of 2-nitrophenol under simulated solar light irradiation. The photocatalytic activity of Fe 3+ /TiO 2 -IL was higher than the samples prepared in the reaction medium without VPIM + I − . Moreover, the effect of pH and H 2 O 2 on the photocatalytic activity of Fe 3+ /TiO 2 -IL was also investigated. Fe 3+ /TiO 2 -IL showed high photocatalytic activity in acidic environment, and H 2 O 2 had a dual effect on the photocatalytic activity Fe 3+ /TiO 2 -IL.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
TALANTA
·
2018
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IF 4.244
Yangxia Han,Yonglei Chen,Jie Feng,Min Na,Juanjuan Liu,Yunxia Ma,Sudai Ma,Xingguo Chen
Fluorescent silicon nanoparticles (SiNPs) displayed different emission wavelengths have been synthesized, but it has not been reported that the preparation of wavelength controllable SiNPs by adjusting the nitrogen content of reducing agents. In this paper, the wavelength-controlled fluorescent SiNPs were prepared by selecting the dopamine (DA) with nitrogen content between catechol and 2-aminophenol as the reducing agent and N-[3-(trimethoxysilyl) propyl]-ethylenediamine (DAMO) as the silicon source via one-step hydrothermal method . The emission wavelength of the prepared SiNPs was in direct proportion to the nitrogen content in the reducing agent. To the best of our knowledge, this is the first time for exploring the nitrogen content in reducing agents could affect the optical properties of SiNPs so far. In addition, the obtained SiNPs could be applied to determinate 2-nitrophenol (2-NP). Based on the combination action of inner filter effect (IFE) and static quenching effect (SQE) mechanism, a wide linear range was obtained from 0.1 to 500 μM, and the limit of detection was 0.029 μM for 2-NP, which was comparable to or even lower than some previous reports. This SiNPs probe was also successfully employed for sensing of 2-NP in industrial effluent with satisfactory results (98.6%–103.4%).
研究领域:
材料科学
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纳米技术
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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