CHEMOSPHERE
·
2021
·
IF 7.086
Jiangfu Zheng,Wenbo Li,Rongdi Tang,Sheng Xiong,Daoxin Gong,Yaocheng Deng,Zhanpeng Zhou,Ling Li,Long Su,Lihua Yang
In this study, an investigation is conducted into the degradation of nitenpyram (NTP) using highly efficient APMMO/PDS/Vis system. As photocatalysts, silver phosphate (AP) and calcined Zn–Al layered double hydroxides (MMO) exhibit high efficiency in achieving charge separation. Besides, the injection of electrons into peroxydisulfate (PDS) from the APMMO can contribute to obtaining the species in the active state with higher efficiency. Based on the APMMO/PDS/Vis system, 50 mg/L of nitenpyram (NTP, 50 mL) can be completely removed in 60 min using 0.8 g/L photocatalyst and 0.2 g/L PDS under the optimum condition and visible light (780 nm > λ > 420 nm). Meanwhile, as demonstrated under visible light within 30 min, an ultrahigh degradation efficiency can be achieved by NTP based on APMMO1/PDS/Vis system. Besides, the electron paramagnetic resonance (EPR) technique and radical quenching experiments suggested 1 O 2 , h + , SO 4 − •, •O 2 − , and •OH are all contributory to the removal of pollutants. Given the outcomes achieved by LC/MS system and mass spectrometry, the primary degradation intermediates of NTP end up being converted into photodegradation products (such as 2-Chloropyridine, 6-Chloropurine Riboside and dl -Leucine). Additionally, there are three potential photodegradation pathways to NTP degradation have been deployed. Moreover, the NTP light degradation occurring in APMMO1/PDS/Vis system is competent under the three types of real water sample. Accordingly, the high-efficiency APMMO1/PDS/Vis system is fit for use in water pollution control for agricultural productions.
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DOI
PubMed
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2017
·Vol. 33
·期 8
·1672-1680
·
IF 0.767
LIAO Pei-Yi,ZHANG Chen,ZHANG Li-Jun,YANG Yan-Zhang,ZHONG Liang-Shu,GUO Xiao-Ya,WANG Hui,SUN Yu-Han
A series of Cu/Co/Mn/Al catalysts derived from hydrotalcite precursors with different Cu/Co molar ratios (0, 0.1, 0.5, 1.0, and 2.0) were prepared and used for the synthesis of higher alcohols from syngas. N2 physical adsorption desorption, inductively coupled plasma atomic
emission spectrometry (ICP-AES), X-ray diffraction (XRD), scanning electron microscopy (SEM), hydrogen temperature-programmed reduction (H2-TPR), thermogravimetry (TG), and high-resolution transmission electron microscopy (HRTEM) techniques were employed to investigate the physical
and chemical properties of the Cu/Co/Mn/Al catalysts. The results show that the optimum Cu content can increase specific surface area, improve reducibility, and form regular layered structure to provide more uniform distribution of active sites, thereby enhancing catalytic activity and alcohol
selectivity. When the Cu/Co molar ratio was 0.5, the yield of alcohol and the alcohol selectivity reached the maximum values of 0.071 g·g-1·h-1 and 35.9%, respectively.
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2020
·
IF 3.306
Chun Kan,Xiaotao Shao,Linyun Wu,Yao Zhang,Xiaofeng Bao,Jing Zhu
High-selectivity detection of trace Al 3+ ions in water and biological systems by a fluorescence imaging method is not yet mature. Herein, we synthesized a novel reversible Al 3+ -specific fluorescent probe named RBLF by linking Rhodamine B and pyridine-3-sulfonyl chloride through o-phenylenediamine in several reactions. RBLF exhibited an ultra-high sensitive and excellent selective response towards Al 3+ by fluorescence and UV–vis spectra in aqueous solutions. What is more worth mentioning is that its response is fast, dual changes in color and fluorescence of the probe solution that can occur instantaneously after adding with Al 3+ . Its detection limit for Al 3+ ions in aqueous system solutions is 14.23 nM, which is far below the maximum allowable amount of Al 3+ in drinking water. Moreover, the probe provided an effective method for detecting low concentrations of Al 3+ in natural water, living cells, zebrafish and plant tissues.
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DOI
高影响因子
GEOCHIMICA ET COSMOCHIMICA ACTA
·
2009
·
IF 4.235
Sean A. Shaw,Derek Peak,M. Jim Hendry
Although widely investigated in relation to acid mine drainage systems at pH > 1.0, we know little about the impact of sulfuric acid (H 2 SO 4 ) on the geochemistry and mineralogy of clays at pH < 1.0 (including negative pH values). Thus, laboratory batch experiments were conducted on three mixed clay samples with different mass ratios of phyllosilicates (smectite, illite , and kaolinite) to investigate the impact of H 2 SO 4 from pH 1.0 to −3.0 for exposure periods of 14, 90, 180, and 365 days. Si and Al K- and L 2,3 -edge X-ray absorption near edge structure (XANES) spectroscopy were employed on these samples to determine the chemical and structural changes that occur during acidic dissolution of phyllosilicates that cannot be distinguished using X-ray diffraction analyses. A series of silicate, phyllosilicate, and Al-bearing standard compounds were also studied to provide an explanation for the observed changes in the clay samples. The Si XANES results indicated the preferential dissolution of the phyllosilicates (pH ⩽ 1.0, t ⩾ 14 d), the persistence of quartz even at pH ⩾ −3.0 and t ⩾ 365 d, and the formation of an amorphous silica-like phase that was confined to the surface layer of the altered clay samples at pH ⩽ 0.0 and t ⩾ 90 d). Al XANES results demonstrated dissolution of Al-octahedral layers (pH ⩽ 1.0, t ⩾ 14 d), the persistence of four-fold relative to six-fold coordinated Al, and the precipitation of an Al-SO 4 -rich phase (pH ⩽ −1.0, t ⩾ 90 d). An existing conceptual model of phyllosilicate dissolution under extremely acidic conditions was modified to include the results of this study.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Haijun Qiu,Xu Wang,Jing Cen,Penghui Shi,Jinchen Fan,Yulin Min,Qunjie Xu
Many methods used to synthesize efficient reducing agents of Fe and Al–layered double hydroxide (Fe/Al–LDH) nanosheets against oxidizing contaminants often require the use of unstable bivalent iron salts and long aging times at ambient temperatures. Here, we developed an easy-to-operate, environment-friendly, and scaled-up electrochemical engineering method without adding metal salts to synthesize Fe/Al–LDHs via an electrolytic reaction of active metal electrodes (Fe and Al). The process resulted in the growth of thin hexagonal Fe/Al–LDHs with a lateral size of approximately 100 nm and thickness of approximately 32 nm. The crystallization process of Fe/Al–LDHs strongly relied on the crystal nucleus of the first precipitate Al(OH) 3 and the Fe chemical valence. The oxidation state of Fe was markedly influenced by hydroxyl ions that formed on the cathode surface and the oxygen evolution reaction at high current density ( i ). The fast and simple manufacturing technique not only had high yield (approximately 0.2 g of Fe/Al–LDHs was obtained when i was 2 mA/cm 2 within 25 min) but also afforded Fe/Al–LDHs with excellent reducibility for the removal of Cr(VI). This study demonstrated an attractive option for the rapid and large-scale synthesis of Fe/Al–LDHs to enhance their application prospects.
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 24
·10953-10967
·
IF 4.682
Yang Jie,Li Jia,Yang Ping,Xing Ningning,Chen Yaming,Zuo Min,Li TingTing
Micromotors have gained considerable attention in the field of environmental remediation owing to their self-propulsion motion that can efficiently accelerate the mass transfer and mixing in solution. Herein, we reported a novel Ag/Mg(Ni)Al-layered double hydroxide (LDH) Janus micromotor derived from lotus pollen for dynamic removal of organic pollutant from water. The as-prepared three-dimensional (3D) flower-sphere micromotor was composed of free-standing Mg(Ni)Al-LDH nanosheets half-deposited with Ag nanoparticles. Under the recoil force caused by the oxygen bubbles those were generated via the decomposition of H 2 O 2 catalyzed by Ag nanoparticles, Ag/Mg(Ni)Al-LDHs micromotors could move rapidly with a speed of 115.4 ± 10.3 μm s −1 (≈ 2.2 body lengths s −1 ) in 5 wt% H 2 O 2 . Furthermore, the maximum Congo red (CR) adsorption capacity of Ag/MgAl-LDH micromotor was up to 350.16 mg g −1 , which was 1.33 times greater than the MgAl-LDHs (non-micromotor). Meanwhile, the adsorption rate was significantly accelerated compared to the non-micromotor counterparts. The results show that the enhanced adsorption capacity of micromotor benefited from the combination of 3D porous microstructure with high surface area (209.7 m 2 g −1 ), electrostatic attraction and self-propelled movement. Graphical abstract
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DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 42
·21029-21038
·
IF 9.931
Liang Zhang,Jing Wang,Xinyi Ren,Wentao Zhang,Tianshu Zhang,Xinnan Liu,Ting Du,Tao Li,Jianlong Wang
The excessive accumulation of toxic copper species makes it imperative to develop smart dual-functional materials for the simultaneous removal and detection of Cu(II) in drinking water. In this work, novel core–shell NH2-MIL-101(Al)@ZIF-8 nanoflowers were successfully fabricated via an internal extended growth mode under the regulation of polyvinylpyrrolidone (PVP) to achieve this goal. Benefiting from the specific affinity of imidazole nitrogen in ZIF-8 toward Cu(II), the resultant NH2-MIL-101(Al)@ZIF-8 shows high adsorption capacity (526.74 mg g−1). Moreover, the fluorescence of NH2-MIL-101(Al) shows a Cu(II)-dependent change, causing this composite to possess superior selective/sensitive detection with a broad linear range (1.5–625 μM) and a low detection limit (0.17 μM) for Cu(II). Specifically, the hybrid MOF@MOF structure provides greater sensitivity as compared to the individual constituent (pristine NH2-MIL-101(Al)) and the mixed state, which is ascribed to the rational optimization of the smart adsorbent based on the following two aspects. (i) The synergistic effect of the core–shell nanostructure improves the preconcentration ability at the interface between single MOFs. (ii) The existence of the three-dimensional hierarchical nanoflower architecture (structure optimization) accelerates the mass transport and sculpts the final composite with enhanced adsorption and detection ability. These indicate that the smart NH2-MIL-101(Al)@ZIF-8 nanoflower could be an excellent candidate for the synchronous remediation and selective detection of Cu(II) in aqueous systems, which could be potentially useful in wastewater treatment and water quality monitoring.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yijun Xue,Wei Sun,Qian Wang,Limei Cao,Ji Yang
MOFs (metal-organic frameworks) are stable materials with both organic and inorganic pores, and possess high surface area fascinating structures. Owing to the unique octahedral of aluminum center and strong Al–O bonds, Al-based MOFs show excellent thermal stability. In this paper, MIL-96(Al) is proved to be effective at dispersing Pt particles evenly and sparsely as it is employed as catalyst support. MIL-96(Al) is synthesized via a water based route and different contents of Pt particles are directly deposited on the surface of MIL-96 in one step by hydrothermal method to prepare Pt X MIL-96 (x represents Pt content) catalysts. The catalyst are sprayed evenly on carbon paper, with Pt content of 0.03%, 0.11%, 0.27% and 0.41%, respectively, and are applied in a gas diffusion reactor with snakelike flow field for low temperature H 2 -SCR. For Pt 5 MIL-96/CP, the NO removal efficiency can reach up to 100% at 60 °C. Electron transfer between Pt and MIL-96 is observed via X-ray photoelectron spectron (XPS). It reveals that the deposited Pt is in metallic state. Meanwhile, the electronic structure of MIL-96 is kept intact in the process of Pt depositing. The excellent performance of Pt 5 MIL-96/CP catalyst strongly suggests its potential application.
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DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 5
·1467-1476
·
IF 5.721
Zhuo-Qian Li,Xinxin Fu,Caiyan Gao,Jinyu Huang,Baojun Li,Yongpeng Yang,Jie Gao,Yonglong Shen,Zhikun Peng,Jing-He Yang,Zhongyi Liu
The one-step hydroalkylation of benzene to cyclohexylbenzene (CHB) needs to occur on bifunctional metal/zeolite catalysts, and introducing more acid sites to match the metal sites plays a key role in improving the matching of acid/metal sites toward the requirements of benzene hydroalkylation. Herein, we designed and constructed a Si–Al framework coating with extra acid sites outside the surface of the Pd/HBeta catalyst and obtained a zeolite-encaged Pd NP structure (Pd@HBeta). Notably, the Pd@HBeta catalysts achieved excellent catalytic performance with 44.0% CHB selectivity at about 85.0% benzene conversion, which is much higher than that of the Pd/HBeta catalyst with a CHB selectivity of 25.1% at the same benzene conversion. The remarkable increment of CHB selectivity of Pd@HBeta is mainly attributed to the extra acid sites provided by the coated Si–Al framework as well as the increase of the B/L ratio. Moreover, the adsorption capacity of benzene and cyclohexene is greatly improved after introducing extra acid sites by coating the Si–Al framework, which is beneficial for both hydrogenation and alkylation. Further DFT calculations reveal that C6H10 can easily desorb from Pd NPs and migrate to the acidic channel of HBeta in the Pd@HBeta catalyst than that in Pd/HBeta. Our work presents an elegant example of catalytic hydroalkylation selectivity regulation by coating an extra Si–Al framework to enhance the matching of acid/metal balance.
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高影响因子
JOURNAL OF AEROSOL SCIENCE
·
2025
·
IF 2.9
Shuting Lei,Yiyang Zhang,Zhu Fang,Xing Jin,Shuiqing Li
Spray flame synthesis has proven to be a promising method for the high-throughput production of multi-component nanoparticles with atomic-level mixing. However, the fast dynamic of flame synthesis presents significant challenges in precisely controlling the morphology and crystalline phase of the particles, especially for multi components. In this paper, we conduct parametric flame synthesis experiments to identify key factors affecting nanoparticle morphology and crystal phase of Y-Al nanoparticles, focusing on the effects of Y/Al atomic ratio, flame temperature, and precursor volatility. The results indicate that the particle morphology depends on the composition, changing from aggregates with sintering necks to spherical particles without sintering necks and back to aggregates as the Al content increases. This trend is consistent with the change in particle melting points, which initially decrease and then rise again. Thus, the variation in melting point causes changes in sintering time, which in turn affect the particle morphology. The particle crystalline phase gradually deviates from the target phase as the Al content increases. Raising the adiabatic flame temperature from 1551 °C to 2340 °C accelerates the diffusion of Al atoms into the lattice, increasing the target phase proportion in the synthesized particles from 66 % to 99 %. By adjusting the amount of 2-ethylhexanoic acid (EHA) added, the volatility differences between the precursors can be modified. The largest discrepancy in precursor volatility is observed when EHA was added at a 50 % equivalence ratio, resulting in only 6 % of the target phase YAH (YAlO 3 , hexagonal type) in the particles. Increasing the EHA addition to 120 % equivalent results in better matching of precursor volatilities, which leads to a significant increase in the target YAH phase to 98 %, demonstrating the critical role of simultaneous evaporation of different component precursors.
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产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 13
·期 1
·39
·
IF 5.719
Yuan-Dong Xu,Yan-Ping Jiang,Xin-Gui Tang,Qiu-Xiang Liu,Zhenhua Tang,Wen-Hua Li,Xiao-Bin Guo,Yi-Chun Zhou
Resistive random-access memory (RRAM) is a promising candidate for next-generation non-volatile memory. However, due to the random formation and rupture of conductive filaments, RRMS still has disadvantages, such as small storage windows and poor stability. Therefore, the performance of RRAM can be improved by optimizing the formation and rupture of conductive filaments. In this study, a hafnium oxide-/aluminum-doped zinc oxide/hafnium oxide (HfO2/Al-ZnO/HfO2) tri-layer structure device was prepared using the sol–gel method. The oxygen-rich vacancy Al-ZnO layer was inserted into the HfO2layers. The device had excellent RS properties, such as an excellent switch ratio of 104, retention of 104s, and multi-level storage capability of six resistance states (one low-resistance state and five high-resistance states) and four resistance states (three low-resistance states and one high-resistance state) which were obtained by controlling stop voltage and compliance current, respectively. Mechanism analysis revealed that the device is dominated by ohmic conduction and space-charge-limited current (SCLC). We believe that the oxygen-rich vacancy concentration of the Al-ZnO insertion layer can improve the formation and rupture behaviors of conductive filaments, thereby enhancing the resistive switching (RS) performance of the device.
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高影响因子
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
·
2020
·Vol. 125
·期 12
·e2020JE006590
·
IF 3.717
Peixin Du,Peng Yuan,Jiacheng Liu,Yixuan Yang,Hongling Bu,Shun Wang,Junming Zhou,Hongzhe Song,Dong Liu,Joseph R. Michalski,Chengshuai Liu
Allophane, a common component on Earth and a probable constituent of the amorphous component on Mars, is closely associated with Fe in the form of structural Fe and/or iron (oxyhydr)oxide coatings. However, until now, the formation and evolution of allophane as products of environmental Fe concentrations have rarely been studied. We investigated allophane precipitation from gels with different Fe/(Fe + Al) molar ratios ( n , 0 ≤ n ≤ 1.0). X-ray diffraction patterns and Fourier transform infrared spectra of the products showed that allophane was nearly the only product at n ≤ 0.2 and that the crystallinity of Fe-rich allophane decreased with increasing n . Combined with the results of transmission electron microscopy and Mössbauer spectroscopy, Fe was found to be mainly incorporated into the gibbsite-like sheet of allophane, forming clusters; the highest Fe-for-Al substitution content was roughly estimated to be 20 mol.%. As n increased further, the formation of allophane was increasingly suppressed, and the Fe phases began to separate from the Al-Si phases, resulting in mixtures of incipient allophane and incipient akaganeite and finally akaganeite. The near-infrared spectroscopic data (1.2–2.6 μ m) of the products showed incapability in identifying poorly ordered minerals in Al-Si-Fe systems, while the features in the range of 0.4–1.2 μ m were powerful for studying iron occurrence in the products. These findings not only offer insights into the formation, evolution and geological role of allophane in Al-Si-Fe systems on Earth but also help constrain the paleoenvironment of locations where allophane and akaganeite co-occur on Mars. Key Points Environmental Fe concentrations control the formation and evolution of allophane in Al-Si-Fe systems Near-infrared spectra (1.2–2.6 μ m) show incapability in identifying short-range ordered minerals in Al-Si-Fe systems Co-occurrence of allophane and akaganeite would constrain the local palaeoenvironment on Mars
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高影响因子
危险品化学品经营许可证（带存储）