MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Tingting Zhang,Hao Guo,Meng Yang,Lei Sun,Junye Zhang,Mingyue Wang,Fan Yang,Ning Wu,Wu Yang
In this study, metal–organic backbone (UiO-66-NH 2 ) and thionyl chloride functionalized carbon nanotubes (COCl-MWCNT) were successfully synthesized, and introduced into carbon black (CB) for fabricating novel electrochemical sensor UiO-66-NH 2 /COCl-MWCNT/CB/GCE towards simultaneous determination of dihydroxybenzene isomers hydroquinone (HQ), catechol (CC) and resorcinol (RC). Due to large surface area, excellent conductivity, good electrocatalytic activity and high stability the developed composite modified electrode delivered excellent analytical performance for these three analytes. Under optimal conditions, differential pulse voltammetric (DPV) currents showed good linear relationships with the concentrations of HQ, CC and RC with low detection limits (0.24 μM, 0.11 μM, 0.47 μM) and wide detection ranges (1–1000 μM and 5–1000 μM). In addition, this sensor demonstrated favorable reproducibility, stability and good selectivity for HQ, CC and RC and possessed a great potential for selective detection of dihydroxybenzene isomers in environmental water samples.
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高影响因子
POLYMER
·
2022
·
IF 4.432
Zhifu Guan,Yiqi Jin,Sha Shi,Biyao Jin,Meishan Zhang,Lianhua Zhao
To enhance the conductivity of sulfonated polyether ether ketone (SPEEK, SP) membrane and avoid the loss of ionic liquid (IL), using aminopropyloligosisiloxane (NH 2 -POSS) as molecular hybrid filler, a self-assembled medium temperature and non-humidified SP/IL/NH 2 -POSS hybrid membrane was prepared. NH 2 -POSS can be assembled into the hydrophilic domain ion phase of SPEEK. In which, –NH 2 of NH 2 -POSS and –SO 3 H of SPEEK formed acid-base pairs at the interface which were conducive to the construction of proton transport channel. In addition, NH 2 -POSS enriched IL in the hydrophilic domain, which retained IL while synergistically increased the conductivity. The results showed that the IL loss rate of SP/IL/NH 2 -POSS-2 membrane was 46.9 wt%, which was about 55.8% of SP/IL membrane; the conductivity of SP/IL/NH 2 -POSS-2 membrane at 200 °C without humidification was 5.51 mS·cm −1 , which was about 4 times that of SP/IL membrane.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Huanhuan Li,Wenhui Geng,Suleiman A. Haruna,Md Mehedi Hassan,Quansheng Chen
In this study, a target-responsive release Surface-enhanced Raman scattering (SERS) sensor was developed for sensitive detection of tetracycline (TTC) using aptamer-gated HP-UiO-66-NH 2 nanochannel strategy. The hierarchically porous zirconium-based metal-organic frameworks (HP-UiO-66-NH 2 MOFs) with high surface areas and the conjugated π-electron system were first synthesized and served as the nanocontainers. The methylene blue (MB) and gold nanoparticles (AuNPs) were then loaded in the pores of HP-UiO-66-NH 2 as the signal probes and capping agent, respectively. Thereafter, aptamer was assembled on the surface of HP-UiO-66-NH 2 based on the π-π stacking interaction. In the presence of TTC, the aptamer “molecular gate” was opened, resulting in the “cargo release” of MB and AuNPs. Hence, the amount of TTC could be determined by monitoring the change of SERS intensity of the supernatant. Under the optimal conditions, a good linear correlation between SERS intensity (886 cm −1 ) and TTC concentration was observed with the concentration from 0.01 to 10000 ng/mL, resulting in a relatively low detection limit of 0.01 ng/mL. Moreover, this method showed a promising practical application in spiked real samples (milk and pork) with recoveries of 93.23–108.79%, which confirmed its great potential in antibiotic detection.
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PubMed
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Pan Pan,Mingming Li,Yuxin Liu,Yisi Feng,Xinglong Li
2,5-diformylfuran (DFF) is a multifunctional intermediate, which can be used in drugs, functional polymers, fluorescent materials and surfactants. In this paper, a TEMPO-assisted magnetic Fe 3 O 4 @SiO 2 @mSiO 2 -NH 2 -Cu(II) catalytic system was developed for the selective oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran. The structure of Fe 3 O 4 @SiO 2 @mSiO 2 -NH 2 -Cu(II) was double-layer shell-core spherical structure with uniform ordered mesoporous on the surface, amino groups and Cu were evenly distributed in the outer mesoporous. The catalyst was characterized by FT-IR, TEM, EDS, SEM, XRD, BET and VSM. The effects of reaction conditions were investigated in detail. The conversion of HMF was 98.9% and the highest DFF yield was 92.4% under atmospheric oxygen in toluene solvent. The catalytic activity did not decrease significantly after 5 cycles. The catalytic system had good substrate adaptability for benzyl alcohols and aromatic alcohols with satisfactory yield of corresponding aldehydes (91.3–100%). A possible reaction mechanism was also proposed and found that bis(μ-hydroxy) double copper (II) may be the active reactant in oxidation reaction. The system provides a promising industrialized preparation method for DFF.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Yan Gao,Miao Yan,Jianshe Zhao
A composite PW 4 @UIO-66-NH 2 /GO was designed and prepared via facile in-situ synthesis method for catalytic oxidation desulfurization of fuel. The proper sizes (window size and pore size) of UIO-66-NH 2 can effective sealing PW 4 as monomolecular active component and prevent PW 4 leaching during the reaction process. At the same time, the introduction of GO can improve the electron transfer of the catalyst. Characterization tests showed that the active component PW 4 was successfully encapsulated with a loading amount of 0.19 mmol/g. The desulfurization results indicated that the PW 4 @UIO-66-NH 2 /GO has excellent catalytic activity, which can remove 99.9% sulfides in model fuel, and the activity did not decrease obviously after repeated use for ten times. The good activity and reusability of PW 4 @UIO-66-NH 2 /GO attributes to the introduction of GO and UIO-66-NH 2 . In addition, based on GC-MS and EPR results, a possible mechanism of desulfurization reaction was proposed.
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高影响因子
CHEMOSPHERE
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2022
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IF 8.943
Lu Zheng,Yifan Gu,Baolv Hua,Jiarui Fu,Fengting Li
Metal-organic frameworks have been investigated in Fenton-like catalysis for tetracycline hydrochloride degradation, a widely used antibiotic which threatens the growth and health of creatures. However, powder phase and absence of large pores limit the materials’ degradation performance and application. In this work, a hierarchical macro-meso-microporous composite melamine sponge@MIL-101-Fe-NH 2 was firstly designed and constructed. While the micropores provided plenty of active sites to generate reactive oxygen species , the macropores and mesopores accelerated mass transfer. Besides, MIL-101-Fe-NH 2 particles dispersed on melamine sponge individually, exposing more catalytic sites and avoiding inactivation caused by aggregation compared to powder catalysts. Its catalysis performance for tetracycline hydrochloride degradation was evaluated through changing various influence factors like H 2 O 2 concentration, catalyst amount, pH and coexisting ions. Different from the preference of homogenous Fenton catalysts for pH 2–4, the composite displayed the most effective degradation at a subacid environment closer to nature with 77.24% in 30 min. Owing to the synergistic effect of hierarchical porous structure and monodispersed nanoparticles , the composite exhibited faster reaction rate and longer persistence compared to powder MIL-101-Fe-NH 2 . Easy recycling and less ion leaching made it advantages for practical application. •OH, •O 2 − and 1 O 2 active species contributed together to the degradation and two main possible degradation pathways were put forward based on 35 detected intermediates.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2021
·Vol. 22
·期 19
·10412
·
IF 5.924
Huiping Chen,Yongpan Shan,Lidong Cao,Pengyue Zhao,Chong Cao,Fengmin Li,Qiliang Huang
Long-term use of a single fungicide increases the resistance risk and causes adverse effects on natural ecosystems. Controlled release formulations of dual fungicides with different modes of action can afford a new dimension for addressing the current issues. Based on adjustable aperture and superhigh surface area, metal–organic frameworks (MOFs) are ideal candidates as pesticide release carriers. This study used Al3+as the metal node and 2-aminoterephthalic acid as the organic chain to prepare aluminum-based metal–organic framework material (NH2-Al-MIL-101) with “cauliflower-like” structure and high surface area of 2359.0 m2/g. Fungicides of azoxystrobin (AZOX) and diniconazole (Dini) were simultaneously encapsulated into NH2-Al-MIL-101 with the loading content of 6.71% and 29.72%, respectively. Dual fungicide delivery system of AZOX@Dini@NH2-Al-MIL-101 demonstrated sustained and pH responsive release profiles. When the maximum cumulative release rate of AZOX and Dini both reached about 90%, the release time was 46 and 136 h, respectively. Furthermore, EC50values as well as the percentage of inhibition revealed that AZOX@Dini@NH2-Al-MIL-101 had enhanced germicidal efficacy against rice sheath blight (Rhizoctonia solani), evidenced by the synergistic ratio of 1.83. The present study demonstrates a potential application prospect in sustainable plant protection through co-delivery fungicides with MOFs as a platform.Keywords:NH2-Al-MIL-101;controlled release;dual encapsulation;synergistic effect;rice sheath blight
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Mengmeng Zhang,Qian Sun,Yuejiao Wang,Weijun Shan,Zhenning Lou,Ying Xiong
Reported powdery adsorbents with poor adsorption efficiency and stability make it imperative to develop novel materials to extract gallium ions (Ga(III)) from effluents. Herein, UiO-66-NH 2 -based mixed matrix membranes (TPU/0.1THB/U6N-1.5 MMMs) via electrospinning is firstly reported for separation and recovery of Ga(III). TPU/0.1THB/U6N-1.5 MMMs efficiently overcomes multiple bottlenecks of powder UiO-66-NH 2 , including poor stability, reusability and adsorption capacity. Its maximum adsorption for Ga(III) is 96.18 mg·g −1 at pH 10.0. It has superiority in selective adsorption of Ga(III) from Al(III), Cu(II), Zn(II), Co(II) coexistence solution. Adsorption capacity of TPU/0.1THB/U6N-1.5 for Ga(III) reaches more than 80% after 9 cycles. Specially, it still retains excellent mechanical strength, flexibility and structural integrity after 12 h filtration, or after 9 adsorption-desorption cycles, even soaked in 5 mol·L -1 HCl for a week. TPU/0.1THB/U6N-1.5 MMMs also improves the problem of low water flux. TPU/0.1THB/U6N-1.5 with high MOFs loading possess high water flux of 382.2 L·m −2 ·h −1 with a permance of 382.2 L·m −2 ·h −1 ·bar −1 and rejection rates of 90% for Ga(III). The main adsorption mechanism of TPU/0.1THB/U6N-1.5 is based on the chelation between phenolic hydroxyl groups of MMMs and Ga(III) at pH 10.0. Overall, the as-prepared TPU/0.1THB/U6N-1.5 has potential for water treatment through the process of membrane adsorption.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhou Zhou,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
In order to fix the photocatalyst and enhance the efficiency of NO degradation, a three-dimensional (3D) g-C 3 N 4 /NH 2 -UiO-66-rGO (CN/NU6-rGO) aerogel was devised and fabricated via solvothermal reaction and boiling-water bath. Herein, a type-II heterojunction was formed at CN/NU6 composite, and then, the composite was coupled with rGO. The resulting material significantly enhanced the nitric oxide (NO, 600 ppb) removal efficiency under visible-light irradiation. Optimizing the content of CN and rGO to a suitable mass ratio can increase the removal efficiency by 65.4%, which is 2.34 times that of pure NU6. This result is attributed to the construction of type-II heterojunction and the charge transport properties of rGO. The involvement of rGO not only provided extra pathways for charge transfer to prevent electron–hole pairs from recombining, but also fixed the catalyst. Moreover, the hybrid aerogel excellently reduced the harmful by-product NO 2 . Cycling experiments, along with transient photocurrent response measurements, verified that CN/NU6-rGO had excellent potential for recyclable and sustainable. This work might shed light on the construction of suitable photocatalytic systems with significant improvement of NO removal and convenient storage of catalyst.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Yixuan Gao,Siming Yan,Yi He,Yi Fan,Liyun Zhang,Jing Ma,Ruitong Hou,Li Chen,Jingyu Chen
Herein, a novel membrane with polyacrylic acid (PAA), NH 2 -MIL-88B(Fe) (NM88B), and graphene oxide (GO) was fabricated via a simple vacuum filter method equipped with the nylon membrane substrate. The composite membrane (PAA@NM88B/GO membrane) retained the laminated structure of GO, and PAA@NM88B was used as the photo-Fenton catalytic nano-filler to intercalate GO. Through a series of material characterization and membrane separation performance tests, the results showed that by introducing porous NM88B and PAA cross-linking modification, PAA@NM88B/GO membrane had excellent hydrophilicity, water flux and dye rejection performance. The flux of the PAA@NM88B/GO membrane was 68.21 L m −2 h −1 bar −1 , which is about 15 times higher than that of GO membrane. In addition, the composite membrane had a high rejection (over 97%) for methylene blue (MB), crystal violet (CV) and Congo red (CR). More importantly, PAA@NM88B/GO membrane can also be used to degrade textile wastewater in real life. The membrane can be used as a catalyst to degrade contaminants, and had a high removal of MB in 40 min (98.79%) under the synergistic effect of membrane adsorption and photocatalysis . Therefore, the results indicated that this new type of PAA@NM88B/GO membrane had potential applications in water purification and actual textile wastewater treatment .
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高影响因子
ANALYST
·
2020
·Vol. 145
·期 23
·7616-7622
·
IF 3.978
Jingxian Li,Xueling Shan,Ding Jiang,Yuru Wang,Wenchang Wang,Zhidong Chen
In this work, a solid-state electrochemiluminescence (ECL) sensor based on resonance energy transfer (RET) was proposed using MoS2QDs@g-C3N4 as a donor and NH2-SiO2@PTCA as an acceptor. Herein, MoS2QDs could significantly facilitate the stability and efficiency of the ECL of g-C3N4. PTCA provided a large platform to anchor NH2-SiO2 nanoparticles. The prepared MoS2QDs@g-C3N4 exhibited good spectral overlap with the UV–vis absorption spectrum of NH2-SiO2@PTCA. Based on this, we designed an “off–on” ECL sensing strategy for sensitive and selective detection of glutathione (GSH). Under the best conditions, the linear range of the sensor for GSH detection was from 0.001 to 100 μM with a detection limit of 0.63 nM (S/N = 3). More importantly, GSH in commercial samples can be detected using the proposed sensor, which indicated its superior detection capabilities and potential application value in commercial medicines.
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PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 19
·3636-3645
·
IF 5.958
Yifei Ye,Dazhi Li,Ping Xu,Jianmin Sun
Until recently, many metal-based catalysts have been developed for the cycloaddition reaction of CO2 with epoxides. However, the leaching of the active metal component would lead to various environmental problems. A novel nonmetal B-doped Lewis acid–base catalyst with hydrogen bond donor (HBD) groups (B-SBA-15-NH2) was prepared successfully through the hydrothermal process and post-modification. B-SBA-15-NH2 exhibited good catalytic performance for the CO2 cycloaddition reaction, and 95% yield of propylene carbonate and satisfied selectivity (98%) were achieved in the presence of the KI cocatalyst. The efficient catalytic activity of B-SBA-15-NH2 resulted from the synergistic effects of B and HBD groups, together with the functionalized –NH2 groups. B-SBA-15-NH2 also exhibited good generality with acceptable yields for the corresponding cyclic carbonates in the CO2 cycloaddition with various epoxides. Furthermore, the developed B-SBA-15-NH2 catalyst could be easily separated by centrifugation and reused for five runs without an obvious loss in activity. The good activity and stable reusability of the metal-free B-SBA-15-NH2 catalyst demonstrate that it is a promising green candidate catalyst in the field of CO2 conversion.
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高影响因子
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