JOURNAL OF POROUS MATERIALS
·
2020
·Vol. 27
·期 5
·1535-1546
·
IF 2.183
Zhang Xiaokang,Zhang Rui,Zhao Chao
Herein, a new sepiolite/alumina aerogel composite with outstanding toughness and machinability was prepared using AlCl 3 ·6H 2 O precursor and sepiolite fibers by a specific sol–gel process and supercritical fluid drying. Sepiolite was added into the aluminum sols containing as high as 37 wt% of AlCl 3 ·6H 2 O and the resulting sepiolite fibers dispersed randomly and uniformly with the lengths of 60–100 nm and diameters of 2–3 nm. With the increase in the ratio of sepiolite, the sepiolite-alumina aerogel composites exhibit no shrinkage during the sol–gel process and supercritical fluid drying, while a linear shrinkage of 4.6% was observed after heat-treatment at 1000 °C. Compared with undoped alumina aerogels, the sepiolite/alumina aerogel composites exhibit outstanding toughness and machinability on grinding, slicing and perforating. Meanwhile, the morphology, phase nature, and porosity of sepiolite/alumina aerogel composites with different sepiolite content (from 0 to 0.06 g/cm 3 ) were investigated.
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高影响因子
OPTICAL AND QUANTUM ELECTRONICS
·
2020
·Vol. 52
·期 6
·1-8
·
IF 1.842
Wang Weirong,Tuo Tianye,Jiang Chun
A facile pathway for solid-state material luminescence enhancement is proposed here by coating graphene on the surface of luminescent material. Ln 3+ (Yb 3+ /Er 3+ )-doped germanium tellurite glasses are prepared by conventional melting and quenching method. With the excitation of 980 nm laser diode, the photo-luminescence intensities of the graphene-coated and uncoated glass samples are measured with different incidence angle of excitation light. When the incidence angle is less than 15°, luminescence enhancement can be observed in the coated samples compared with uncoated one. The insight for the enhancement is also discussed.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 6
·1-9
·
IF 6.232
Xi Weiyan,Zhai Jiali,Zhang Yunjing,Tian Lei,Zhang Zipin
Based on the intrinsic electrochemical features of brucine integrated with carbon nanotubes (brucine/SWNTs), dimeric quinoid brucine was electrochemically generated by electroactivation of a brucine/SWNTs-modified GC electrode and used as a novel electrocatalyst for efficient electro-oxidation of hydroxylamine (HA). The electrocatalytic activity was investigated with cyclic voltammetry in the range pH 2.0 to pH 11.0, and the best electrocatalytic performance of the electrocatalyst was obtained at pH 10.0. By taking advantage of the electrocatalytic activity of the dimeric quinoid brucine toward HA, we have developed an electrochemical sensor for HA measurements based on a brucine/SWNTS-modified GC electrode using amperometry with the applied potential of + 0.1 V (vs. Ag/AgCl). Under the optimized conditions, the current response toward HA concentration shows a linear relationship in the dynamic ranges of 0.1–10 μM and 10–1000 μM with a detection limit of 0.021 μM based on the 3σ criterion. The sensor was used to assay HA in pharmaceuticals including hydroxyurea tablets and pralidoxime iodide injections with satisfactory results. The spike-and-recovery for samples of tap water ( n = 9) and lake water ( n = 9) was within 97.17–100.16%.
Schematic illustration of electrochemical sensing of hydroxylamine (HA) enabled by integrating brucine with single-walled carbon nanotube (brucine/SWNTs) based on electro-activation of brucine/SWNTs-modified GC electrode
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高影响因子
Emergent Materials
·
2020
·Vol. 3
·期 3
·307-313
·
IF 0
Han Yu,Yue Dongting,Zhao Yixin,Qian Xufang
The nano-Fe(0)/mesoporous carbon supported on biochar (MCFe/BC) was synthesized by a co-assembly process followed with carbon thermal reduction method. The specific surface area of MCFe/BC was 582.0 m 2 /g. The highest removal efficiency of pyrene in sand can reach about 40% after 7 h duration on MCFe6.2/BC with 6.2 wt% of iron by the peroxydisulfate advanced oxidation process (PDS-AOP). The removal efficiency of pyrene by adsorption at pH values varied from 4 to 10 in 24 h is around 40%, which shows that adsorption is independent with the pH values, while PDS-AOP is pH dependent, which is more efficient in acidic and basic conditions. The graphitic structure and oxygen-containing groups of carbon materials are benefit for adsorption of PAH. The presence of Nano-Fe(0) is responsible for the activation of peroxydisulfate especially at acidic condition. Our results indicate the potential of PDS-AOP using zero valent iron/porous biochar composite as the activator in practical soil remediation.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 5
·1-12
·
IF 6.232
Dong Wenjuan,Wang Ruiping,Gong Xiaojuan,Liang Wenting,Fan Li,Song Shengmei,Dong Chuan
A far-red fluorescence “off-on” sensing strategy is described for sequential ratiometric determination of Cu 2+ and L-histidine (L-His) based on fluorescence resonance energy transfer (FRET) system. N,S,P co-doped carbon dots (N,S,P-CDs) and N-acetyl-L-cysteine functionalized gold nanoclusters (NAC-AuNCs) are used in the FRET system, which serve as energy donor and acceptor, respectively. After adding NAC-AuNCs into the solution of N,S,P-CDs, the fluorescence of N,S,P-CDs is effectively quenched, while the far-red fluorescence of NAC-AuNCs appears. Cu 2+ can decrease fluorescence of NAC-AuNCs, and then L-His can effectively recover the fluorescence of NAC-AuNCs. The possible reason is that the stronger affinity between Cu 2+ and L-His can pull Cu 2+ away from the surface of NAC-AuNCs. Through it all, the emission intensity of N,S,P-CDs remains nearly constant, so the ratio of fluorescence intensities at 485 and 625 nm exhibits a linear correlation to the Cu 2+ and L-His concentration, respectively. The sensing platform shows good selectivity towards Cu 2+ and L-His with a linear range of 0.65–26.58 μM and 3.13–56.25 μM and determination limits of 0.50 μM and 0.374 μM, respectively. The proposed method has been successfully used for Cu 2+ and L-His determination in real samples with satisfying results.
Graphical abstract
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高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-10
·
IF 12.121
Zhou Lu,Zhou Jun,Lai Wei,Yang Xudong,Meng Jie,Su Liangbi,Gu Chenjie,Jiang Tao,Pun Edwin Yue Bun,Shao Liyang,Petti Lucia,Sun Xiao Wei,Jia Zhenghong,Li Qunxiang,Han Jiaguang,Mormile Pasquale
In recent years, surface-enhanced Raman scattering (SERS) of a molecule/metal–semiconductor hybrid system has attracted considerable interest and regarded as the synergetic contribution of the electromagnetic and chemical enhancements from the incorporation of noble metal into semiconductor nanomaterials. However, the underlying mechanism is still to be revealed in detail. Herein, we report an irreversible accumulated SERS behavior induced by near-infrared (NIR) light irradiating on a 4-mercaptobenzoic acid linked with silver and silver-doped titanium dioxide (4MBA/Ag/Ag-doped TiO 2 ) hybrid system. With increasing irradiation time, the SERS intensity of 4MBA shows an irreversible exponential increase, and the Raman signal of the Ag/Ag-doped TiO 2 substrate displays an exponential decrease. A microscopic understanding of the time-dependent SERS behavior is derived based on the microanalysis of the Ag/Ag-doped TiO 2 nanostructure and the molecular dynamics, which is attributed to three factors: (1) higher crystallinity of Ag/Ag-doped TiO 2 substrate; (2) photo-induced charge transfer; (3) charge-induced molecular reorientation.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 14
·16646-16655
·
IF 3.056
Zhu Meng,Luo Yongming,Cheng Nannan,Yang Ruyi,Zhang Juqin,Zhang Mengyun,Christie Peter
Diphenylarsinic acid (DPAA) is an emerging phenylarsenic compound derived from chemical warfare agents. It has been suggested that biostimulation of sulfate reduction decreases the concentrations of DPAA in soils. However, biostimulation often induces Fe(III) reduction which may affect the mobility and thereby the transformation of DPAA. Here, a soil incubation experiment was carried out to elucidate the impact of Fe(III) reduction on the mobilization and transformation of DPAA in a biostimulated Acrisol with the addition of sulfate and lactate. DPAA was significantly mobilized and then thionated in the sulfide soil (amended with sulfate and sodium lactate) compared with the anoxic soil (without addition of sulfate or sodium lactate). At the start of the incubation period, 41.8% of the total DPAA in sulfide soil was mobilized, likely by the addition of sodium lactate, and DPAA was then almost completely released into the solution after 2 weeks of incubation, likely due to Fe(III) reduction. The relatively low fraction of oxalate-extractable Fe in Acrisol, which contributes significantly to DPAA sorption and is more active and reduction-susceptible, may explain the observation that only < 40% of the Fe(III) (hydr)oxides were reduced when DPAA was completely released into the solution. A more rapid and final enhanced elimination of DPAA was observed in sulfide soil and the fraction of total DPAA decreased to 60.1 and 91.0%, respectively, at the end of the incubation in sulfide soil and anoxic soil. The difference appears to result from increased DPAA mobilization and sulfate reduction in sulfide soil. On the other hand, the formation of FeS precipitate, a product of Fe and sulfate reduction, may reduce the efficiency of DPAA thionation. Accordingly, the potentially contrasting effects of Fe(III) reduction on DPAA thionation need be considered when planning biostimulated sulfate reduction strategies for DPAA-contaminated soils.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12836-12847
·
IF 3.553
Zhu Zongmin,Lin Panlong,Wang Hao,Wang Luoxin,Yu Bin,Yang Feihua
Abstract In order to improve the flame retardancy and smoke suppression of epoxy resin (EP) simultaneously, we synthesized a melamine phenylhypophosphonate named as MABP via a simple one-step method and used it to modify EP materials. As expected, the addition of MABP not only largely improved the flame retardancy but also restrained the smoke release of EP. For details, when the content of MABP was 10 wt%, the EP composite possessed a limiting oxygen index value of 33% and achieved to a UL-94 V-0 rating as well as its PHRR, THR and TSP values decreased by 55.1%, 27.1% and 60% compared with that of neat EP, respectively. In addition, the flame-retardant mechanism was investigated by multiple instruments, and the corresponding results exhibited that the MABP could improve the compactness of char layer in condense phase and exerted fire-inhibition effect in gaseous phase. Graphic abstract
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 27
·34135-34146
·
IF 3.056
Zhang Kejia,San Yulong,Cao Cong,Zhang Tuqiao,Cen Cheng,Zhou Xinyan
Chlorine-based compounds have been used as a disinfectant in drinking water treatment plants for decades because of their excellent sterilisation efficiency and low cost. However, the formation of disinfection by-products during chlorination is a cause for concern. Peracetic acid (PAA) is a strong oxidant with a redox potential higher than that of chlorine and does not form harmful disinfection by-products. It is thus a potential alternative for chlorine-based disinfectants. However, PAA decomposes rapidly in water at a rate that is highly affected by many factors, such as organic compounds and pH. The aim of this study is to investigate the stability of PAA during drinking water disinfection. To accomplish this, we studied methods for rapid detection of residual PAA and PAA decay in drinking water. Residual PAA was detected in water by the spectrophotometry-total chlorine reagent (SPTCR) method with a PAA concentration range of 0.090–10 mg/L ( R 2 = 0.9943). Decay tests of PAA in drinking water and other sources of water showed that the decay process conformed to the first-order kinetic model with fast and slow reactions. Among four factors, pH was the key factor in the decay process because an alkaline environment significantly promotes the decomposition of PAA. In addition, total organic carbon (TOC), conductivity, and initial PAA concentration also affected PAA decay. Experimental and statistical analyses suggested that these factors affected PAA decay in the following descending order of influence: TOC, initial PAA concentration, and conductivity. In real water matrices, the PAA decay rate increased with increasing initial PAA concentration.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 24
·30778-30788
·
IF 3.056
Wang Guanghui,Luo Qiuyan,Dai Jialing,Deng Nansheng
In this work, the β-cyclodextrin modified magnetic graphene oxide (β-CD/MGO) composite was fabricated by the in situ co-precipitation method and characterized by Fourier transform-infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), and particle size analysis. The adsorption behavior of dichromate ions on the β-CD/MGO was investigated, and the mechanism of adsorption was also studied using FT-IR and XPS. The results from SEM and TEM showed that the graphene oxide (GO) layer became rough, and many fine particles were attached after compounding with ferroferric oxide and β-cyclodextrin. The characterization results of FT-IR and XPS show that that β-cyclodextrin and ferroferric oxide have been perfectly compounded to the graphene oxide layer and β-CD/MGO has a particle size of about 460 nm, a specific surface area of 252.3 m 2 g −1 , and a saturation magnetization of 73.5 emu g −1 . The adsorption amount of dichromate ions on the β-CD/MGO is affected by pH, adsorbent dosage, and adsorption time. Kinetic studies showed that the adsorption process followed a pseudo-second-order kinetic model. Equilibrium data agreed very well with the Langmuir model, the maximum adsorption amount of dichromate ions on the β-CD/MGO was 49.95 mg g −1 . After five successive adsorbent reuses, the reuse rate is still 73%, indicating the excellent potential reusability of β-CD/MGO adsorbent. β-CD/MGO exhibits excellent adsorption performance for dichromate ions. As an environmentally friendly magnetic adsorbent, β-CD/MGO is suitable for the treatment of dichromate-containing wastewater.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 24
·10593-10610
·
IF 3.553
Yang Ji-nian,Liu Yue,Xu Yu-xuan,Nie Shi-bin,Li Zhen-yu
To functionalize the surfaces of graphene oxide (GO) and improve its interfacial compatibility to polymers, the nanosheets of nickel phyllosilicate (Ni-PS) self-assembly decorated on GO (GO@Ni-PS) were first synthesized via the combination of one-step solgel and gentle hydrothermal approaches. Then, the as-synthesized GO@Ni-PS was incorporated into epoxy resin (EP) as filler to yield high-performance composites. By structural, morphological and thermal characterizations, we found the GO@Ni-PS has been successfully synthesized and could disperse homogeneously in the EP matrix. The added GO@Ni-PS depicts the positive influences on the thermal stabilities, tribological properties as well as the flame retardancy in high heat flux. Also, the excellent accelerating influence of GO@Ni-PS on the curing behavior of EP was presented and the kinetic analysis quantitatively demonstrated the gradually decreased activation energy of curing along with increased GO@Ni-PS content.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 4
·1-10
·
IF 1.81
Chen Yu,Dong Zegang,Xue Xinxin,Chen Song,Natan Avi,Lv Yu,Chen Cheng,Yang Yinye,Cen Weifu,Yang Yang
Pure SnO 2 and La-doped SnO 2 nanocomposite were prepared through hydrothermal method, and their gas sensing performances were studied. Results indicate that the sensing response of the 5 wt% La-doped SnO 2 nanocomposite reached 29.5 when exposed to 75 ppm methanol at the optimal operating temperature of 220 °C, which was over seven times larger than that of pure SnO 2 nanoparticles. In addition, the response and recovery time were shortened to 12 s and 7 s, respectively. Moreover, the 5 wt% La-doped SnO 2 nanocomposite presents a good selectivity toward methanol among methanal, methanol, ammonia, acetone and benzene gases. The improvement in the gas sensing properties of the 5 wt% La-doped SnO 2 nanocomposite toward methanol can be attributed to the smaller crystallite size, larger surface area and the modified chemical nature of nanocomposite surface.
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