ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hui Li,Shushu Chu,Qian Ma,Yuan Fang,Junpeng Wang,Quande Che,Gang Wang,Ping Yang
Morphology-tunable C–N/SnO2-based hierarchical microspheres with good gas sensitivity for triethylamine (TEA) have been fabricated via facile electrospinning and a subsequent calcination process. The reaction temperature and modifying calcining technology played a dominant role for the morphological evolution from precursor fibers to microspherical shapes and the formation of C–N-decorated SnO2 phase composition. C–N/SnO2/ZnO composites with tunable crystallinity, microstructure, and gas-sensing performance were strictly dependent on the added amount of Zn element. Fascinatingly, the constructed C–N/SnO2/ZnO/Au composites can not only precisely regulate the crystal size, dispersion status, loading position, and content of Au nanoparticles but also display excellent gas-sensing properties with ultrasensitivity and high selectivity under various temperature detections. The response of C–N/SnO2/ZnO/Au composites can reach up to approximately 1970, calculated to be 121.6 and 23.6 times for 50 ppm TEA molecules at optimal conditions compared with C–N/SnO2 and C–N/SnO2/ZnO microspheres, respectively, actually representing the highest response value at high temperatures reported to date. The superior long-aging stability of sensing behaviors and phase structures can be also observed after 1 month. More importantly, novel C–N/SnO2/ZnO/Au sensors were employed for availably detecting low-concentration volatiles released from the storage procedure of fishes at 80 °C, indicating the practical application in chemical detectors and biosensors at low temperature. The novel gas-sensing mechanisms derived primarily from the combination of phase compositions, morphologies, and unique surface/interface transfer processes of C–N/SnO2/ZnO/Au composites are presented and investigated in detail, which will contribute to the design and development of other semiconductor-based composite sensors.
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Food Analytical Methods
·
2019
·Vol. 12
·期 7
·1585-1593
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IF 2.413
Gao Xue,Liu Yutong,Wang Yu,Zhang Qiang,Liu Xiuying,Tang Yiwei,Li Jiangrong
Hierarchical zinc oxide (ZnO) nanomaterials have been successfully synthesized using a biotemplated method. The morphology and structure of the produced samples were characterized by means of SEM, TEM, XRD, FTIR, etc. The result showed that hierarchical ZnO nanomaterial retained the porous network structure of the template. Trimethylamine (TMA) in aquatic products was effectively detected by a fluorescence resonance energy transfer (FRET)–based molecular sensor using ZnO as energy donors and tetrasodium-meso-tetra(4-sulfonatophenyl) porphine dodecahydrate (TPPS) as energy acceptors. The FRET efficiency was reduced by the addition of TMA, due to the combination between TPPS and TMA. The fluorescence intensity of ZnO (donor) would decrease gradually with the increasing concentration of TMA. Under the optimal conditions, a linear correlation was established between the fluorescence intensity ratio I TPPS / I ZnO and the concentration of TMA in the range of 2.67 × 10 −11 –6.67 × 10 −6 mol/L and 1.33 × 10 −5 –6.67 × 10 −4 mol/L with a detection limit of 7.51 × 10 −12 mol/L. The proposed method was successfully applied to the determination of TMA in real fish samples with satisfactory results.
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ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Min Liu,Luping Feng,Xiaoyue Zhang,Yue Hua,Yuqi Wan,Chuan Fan,Xiaoxia Lv,Hua Wang
Superwettable microwell arrays were constructed for the first time by the synergic photocatalysis of silver-doped-ZnO (Ag–ZnO) nanorods patterned on indium tin oxide (ITO) electrodes for electroanalysis of glutathione (GSH) in hela cells through the signal output of AgCl electrochemistry. The newly prepared Ag–ZnO nanorods with high photocatalysis were dispersed into an octadecyltrichlorosilane (OTS) matrix to be deposited onto ITO substrates, yielding superhydrophobic Ag–ZnO–OTS coatings. Superhydrophilic microwells were further created by the Ag–ZnO photocatalysis under UV irradiation to produce Ag–ZnO microwell arrays featuring the superwettability profile. The resulting Ag–ZnO microwell-modified ITO electrodes were employed further for electroanalysis of GSH through solid-state AgCl electrochemistry, in which the specific Ag–GSH interactions would trigger a rational decrease in the sharp AgCl peak currents at the potential approaching zero. Moreover, benefitting from the superwettability feature, the microwells on the ITO electrodes could facilitate the condensing enrichment of GSH analytes from the sample droplets, achieving improved analysis sensitivity. The as-developed electroanalysis strategy was subsequently demonstrated for the detection of GSH in hela cell supernatant with levels down to about 27.30 pM. Additionally, this synergic photocatalysis-based preparation route can be tailored for the large-scale fabrication of various array platforms with the superwettability feature for high-throughput and sensitive biological analysis.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 25
·期 22
·22244-22258
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IF 2.8
Yan Xuechao,Zhang Xiaoping,Li Qian
In this paper, an effective chitosan/beta-cyclodextrin/nanometer zinc oxide (CS/β-CD/Nano-ZnO) composite porous membrane was synthesized by sol-gel and polymer-assisted inverting method. Preparation conditions of CS/β-CD/Nano-ZnO were investigated by single-factor and Box-Behnken response surface methodology optimizing triethoxyvinylsilane (JH-V151), beta-cyclodextrin (β-CD), and nanometer zinc oxide (Nano-ZnO), and applied to study the adsorption characteristics of Cong red (CR) from aqueous solution using batch experiments. The optimum preparation conditions were determined that the volume fraction of JH-V151 alcohol solution was 11%, the ratio of β-CD to CS was 5.35, and the ratio of Nano-ZnO’s mass to solution’s volume was 0.36%. Different characterization methods including field-emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, UV-visible spectroscopy, and Universal Materials Tester were used to prove the appearance, crystallinity, functional groups, swelling degree, transmittance, and tensile property of CS/β-CD/Nano-ZnO. The optimized batch experimental parameters were 50 mg L −1 , 4 h, 7.0, 0.5 g L −1 , and 55.0 °C as initial concentration, contact time, pH, adsorbent dose, and temperature, respectively. The maximum adsorption capacity on CR reached 96.33 mg g −1 , which is 4.34 times with respect to CS. The batch experimental data were best described by a pseudo-second-order kinetics model and Langmuir isotherm model ( R 2 = 0.9965, theoretical saturated adsorption capacity 147.28 mg g −1 ). The values ∆G were − 2.09, − 4.73, and − 7.37 kJ mol −1 at 298, 308, and 318 K temperatures, respectively. The ∆H value was 76.68 kJ mol −1 , indicating the endothermic and spontaneous adsorption in nature. The ∆S value was 0.26 kJ mol −1 K −1 , a signal of entropy increase during adsorption. The adsorption capacity decreased only by 5.8% after six recycling runs, which indicated the reusability of CS/β-CD/Nano-ZnO. Therefore, the CS/β-CD/Nano-ZnO composite porous membrane is a promising membrane material for the efficient removal of CR from any water at large and economic scales at moderate concentration.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Ziqiang Ai,Changqing Liu,Qiwu Zhang,Jun Qu,Zhao Li,Xiaoman He
In this study, a mechanochemical route to promote the adsorption of the precursor of Zn-Al layered double hydroxide (LDH) was introduced, in which ZnO and SiO 2 were added to Zn basic carbonate and Al hydroxide that were first dry milled into an activated state as a precursor for a LDH phase. The samples prepared in this way were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Scanning electron microscopy (SEM). The precursors showed a high adsorption rate when added with the oxides. 10% addition of ZnO gave a maximum MO removal efficiency of 96.91% (193.82 mg/g at initial MO concentration of 160 mg/L), 16.46% higher than the sample without addition. Addition of SiO 2 at 25% allowed MO removal efficiency reaching 88.90% (222.25 mg/g, at initial MO concentration of 200 mg/L), 19.26% higher than the no additive sample. The improvement in the adsorption performance could be attributed to the effective dispersion of the precursor's agglomeration phenomenon. Discussion was performed based on the characterized features of the samples and fitting results on several adsorption models.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Feiya Fu,Jiayuan Gu,Jinfeng Cao,Rongsheng Shen,Hanxiang Liu,Yanyan Zhang,Xiangdong Liu,Jinping Zhou
This work proposed a straightforward and sustainable strategy to synthesize a Ag/ZnO decorated cellulose nanocomposite. First, zincate was introduced into an aqueous cellulose–NaOH/urea dope to enhance the solution stability. Second, AgNO3 was directly added into the cellulose dope without gelation, and then was reduced into Ag NPs by cellulose chain. Finally, zincate transformed into ZnO via biomimetic mineralization along with the regeneration of the cellulose dope, and an Ag/ZnO decorated cellulose nanocomposite film was synthesized. The Ag NPs with a mean diameter of 16.5 nm were well dispersed in the cellulose matrix, and some were doped on the surface of the embedded ZnO crystal. With increase of the Ag loading, the nanocomposite film showed more rapid sterilization for Escherichia coli than Staphylococcus aureus, and complete eradication could be achieved within 3 h for both bacteria. This simple and environmental friendly method hopefully provided new routes for large-scale production of antibacterial cellulose-based nanohybrids in industry.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Zhiwei Ding,Rongpeng Yu,Chaoyang Li,Yiran Li,Liangyin Xiang,Yingli Zhao,Zhanchao Liu,Yinhua Jiang,Jianming Pan,Yan Liu
Fouling formation on membrane surfaces limits membrane-based separation performance in industrial activities such as wastewater recycling and desalination. Designing and preparing emerging materials capable of improving the balance between permeability and rejection remains a great challenge. A sandwich-like composite with loose and flat interlayers was produced by combining rigid zinc oxide (ZnO) nanoparticles with easily stackable, folded sulfonated graphene (SGO) and subsequently non-solvent-induced phase separation (NIPs) was employed to produce novel PSF ultrafiltration (UF) membranes with varying amounts of nanofiller of SGO-ZnO. The successful anchoring of ZnO on SGO was confirmed by FTIR, XRD, Raman spectroscopy and TGA. The produced membranes have been investigated using contact angle (CA), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The incorporation of ZnO suppressed the stacking and wrinkling of SGO, which increased the vertical interlayer paths and lateral bending paths. As a result, water molecules could freely pass through the extended channels of SGO, and with only 0.2 wt% of nanoparticles doped, the pure water flux was increased f from 229.2 L m −2 h −1 to 601 L m −2 h −1 . Negatively charged impurities were selectively repelled due to electrostatic interactions with −SO 3 H, which resulted in the removal of BSA remaining above 98 %. In addition, the separation performance of the humic acid (HA)-simulated water sample, a common contaminant, was investigated using the designed modified membranes. The greatest HA rejection (98.33 %) was shown by the UF membrane. All these findings suggest that the addition of sandwich-like SGO-ZnO successfully overcomes the “trade-off effect” between permeability and selectivity in PSF membranes.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 22
·期 14
·11109-11117
·
IF 2.828
Zhang Ruichang,Zhang Haibo,Tu Chen,Hu Xuefeng,Li Lianzhen,Luo Yongming,Christie Peter
Toxicity of engineered nanoparticles on organisms is of concern worldwide due to their extensive use and unique properties. The impacts of ZnO nanoparticles (ZnO NPs) on seed germination and root elongation of corn ( Zea mays L.) and cucumber ( Cucumis sativus L.) were investigated in this study. The role of seed coats of corn in the mitigation toxicity of nanoparticles was also evaluated. ZnO NPs (1,000 mg L −1 ) reduced root length of corn and cucumber by 17 % ( p < 0.05) and 51 % ( p < 0.05), respectively, but exhibited no effects on germination. In comparison with Zn 2+ , toxicity of ZnO NPs on the root elongation of corn could be attributed to the nanoparticulate ZnO, while released Zn ion from ZnO could solely contribute to the inhibition of root elongation of cucumber. Zn uptake in corn exposed to ZnO NPs during germination was much higher than that in corn exposed to Zn 2+ , whereas Zn uptake in cucumber was significantly correlated with soluble Zn in suspension. It could be inferred that Zn was taken up by corn and cucumber mainly in the form of ZnO NPs and soluble Zn, respectively. Transmission electron microscope confirmed the uptake of ZnO NPs into root of corn. Although isolation of the seed coats might not be the principal factor that achieved avoidance from toxicity on germination, seed coats of corn were found to mitigate the toxicity of ZnO NPs on root elongation and prevent approximately half of the Zn from entering into root and endosperm.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Haomiao Cao,Zhaoyi Yin,Xiaoyi Dong,Yongjin Li,Yong Yang,Jianbei Qiu,Zhengwen Yang,Zhiguo Song
Exploring strategies to improve the near-infrared response of photocatalysts is an urgent challenge that can be overcome by utilizing upconversion (UC) luminescence to enhance photocatalysis. This paper reports the fabrication of a ZnO/Bi 3 Ti 2 O 8 F:Yb 3+ , Er 3+ (ZnO/BTOFYE) Z-scheme heterojunction based on a Bi 3 Ti 2 O 8 F:Yb 3+ , Er 3+ (BTOFYE) UC photocatalyst via electrostatic self-assembly. Fermi energy difference at the interface of BTOFYE and ZnO generates a strong internal electric field (IEF) in the Z-scheme heterojunction, offering a novel charge transfer mode that promotes carrier transfer and separation while retaining the strong redox capability. These results are confirmed through in situ X-ray photoelectron spectroscopy, in situ Kelvin probe force microscopy, electron spin resonance, and density functional theory calculations. In addition, the effect of the IEF on the UC luminescence process of Er 3+ enhances the luminescence intensity, considerably improving the UC utilization efficiency. The optimal ZnO/BTOFYE degrades 64 % of ciprofloxacin in 120 min, which is 2.3 times more than that degraded by BTOFYE. Overall, the results of this study offer a reference for the rational development of high efficiency UC photocatalysts by generating IEF in Z-scheme heterojunctions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Chenchen Cheng,Zhaoqi Zhu,Mingxing Wang,Hanxue Sun,Jiyan Li,Rui Jiao,An Li
Epoxy resin, as a thermosetting polymer material with good performance, has been limited in application due to its high flammability. In this investigation, porous CuO-ZnO hollow spheres (CZHS) were prepared by a hydrothermal method. By incorporation with ionic liquids loaded CuO-ZnO hollow spheres (CZHS@Ils) and ammonium polyphosphate (APP) into epoxy resin (EP) matrix, a new composite flame retardant material, named as EP/7.5APP/1.5CZHS@ILs, was developed for improvement of their thermal insulation and flame retardancy. The thermal conductivity of EP/7.5APP/1.5CZHS@ILs was measured to be 0.0197 W m −1 K −1 , which is lesser than that of APP incorporated epoxy resin (EP/APP), demonstrating good thermal insulation capability. The flame retardancy were assessed using the limiting oxygen index (LOI) test, the Vertical flame testing (UL-94) test, and the cone calorimeter (CC) test. The results obtained from LOI test show that the EP/7.5APP/1.5CZHS@ILs has good flame retardancy with a LOI value of up to 28, better than that of pure EP which has a LOI value of 19.2. Moreover, a V-0 level of the EP/7.5APP/1.5CZHS@ILs was observed from the UL-94 test. The peak heat release rate (PHRR) was reduced to 257.9 kW m −2 , which is 74.8 % lower than that of the pure EP. Such results are attributed to the synergy effect of CZHS@ILs and APP which offers the epoxy resin excellent flame retardancy. Taking advantages of the excellent thermal insulation, flame retardancy and better mechanical properties, the as-resulted EP/7.5APP/1.5CZHS@ILs may hold great potential for future thermal insulation and flame-retardant applications of energy saving building.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Kai Cui,Yang Hong,Jingyang Li,Wenjing Wei,Tianyu Zhang,Hongjun Kang,Yang Li,Wei Qin,Xiaohong Wu
The metal-oxide-semiconductor field-effect transistor (MOSFET) devices as electronically controlled switches suffer performance degradation or even damage under high-energy electron radiation. Therefore, it is urgent to develop novel packaging hardening coatings to mitigate the risk of high-energy electron radiation exposure for MOSFET devices. Here, Cs 4 PbBr 6 @ZnO heterojunction is prepared by atomic layer deposition technology, and the polymer-based composite coatings (Cs 4 PbBr 6 @ZnO/EP) are constructed on the surface of MOSFET devices, showing the excellent radiation resistance. The threshold voltage offset under high-energy electron radiation is reduced from 2.26 V to 0.49 V. Experimental and theoretical calculation results reveal that Cs 4 PbBr 6 @ZnO functional fillers play a crucial role in the blocking of high-energy electron radiation. Meanwhile, Cs 4 PbBr 6 @ZnO heterojunction is beneficial to the interfacial electron transfer, forming an electron accumulation region with high local electron density and an electron depletion region with increased extranuclear electron binding energy, which reduces the trapping charge concentration and improves the radiation resistance of MOSFET devices. This work provides a novel strategy for the design and development of anti-radiation hardening MOSFET devices.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Zhiyuan Chen,Wenhui Chen,Peipei Han,Jizhou Yang,Zhi Wan,Peng Hu,Feng Teng,Haibo Fan
Compared with traditional photocatalytic materials, hollow nanofibers can show greatly improved photocatalytic efficiency due to their large specific surface area and more surface-active sites. In this work, one-dimensional (1D) hollow ZnGa2O4/ZnO nanofibers were successfully prepared by coaxial electrospinning technology first, and then the effect of Ag photodeposition on the photocatalytic degradation of tetracycline hydrochloride (TC-HCl) was studied. It is found that Ag can improve the light absorption of the Ag@ZnGa2O4/ZnO architecture, and meanwhile an S-scheme heterojunction forms between ZnGa2O4 and ZnO, which can synergistically increase the amounts and reduce the recombination of photogenerated carriers, thereby improving the photocatalytic degradation performance. By optimizing the ratio of different mass fractions of Ag, the maximum degradation rate can reach 0.0708 min−1, which is 22 times that of the TC-HCl self-degradation rate. This work not only provides a new idea for the preparation of a 1D hollow nanofiber heterojunction photocatalyst, but has also prepared an effective catalyst for photocatalytic degradation of TC-HCl.
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