Nanotechnology Reviews
·
2021
·Vol. 10
·期 1
·919-932
·
IF 7.848
Jiahao Hu,Jie Ding,Jianping Ai,Honglin Li,Shaozhi Li,Qingbo Ma,Lihui Luo,Xiaoling Xu
In this article, the flower-like, urchin-like, and rod-like ZnOs were synthesized by a convenient atmospheric hydrothermal method. The crystalline structures, morphologies, exposed crystal faces, and specific surface areas of the as-prepared ZnO samples were analyzed. Rhodamine B (RhB) was used as the simulated pollutant to evaluate the photocatalytic performance of the ZnO nanostructures. The flower-like ZnO prepared by controlled hydrothermal method at room temperature for 2 h displayed highest specific surface area and exposed more high active
{
2
1
¯
1
¯
0
}
facets compared to the other two morphologies of ZnO. In addition, within 2 h of the photocatalytic reaction, the flower-like ZnO results in 99.3% degradation of RhB and produces the most hydroxyl radicals (˙OH) 47.83 μmol/g and superoxide anions (˙
O
2
−
) 102.78 μmol/g. Due to the existence of oxygen vacancies on the surface of
{
2
1
¯
1
¯
0
}
facets, the flower-like ZnO can efficiently catalyze the production of active oxygen, leading to the improvement in the photocatalytic efficiency.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2021
·
IF 3.196
Dandan Liu,Haiou Liang,Tong Xu,Jie Bai,Chunping Li
Through a simple fiber template method, we combined the n-type TiO 2 catalysts with n-type ZnS@ZnO heterojunction to synthesize a high-efficiency ternary hollow TiO 2 -ZnS@ZnO n-n heterojunction. Under these modified conditions, the composite catalysts could broaden the visible light absorption range of the pure TiO 2 , and both the hollow structure and heterojunction could inhibit the recombination ability of the photon-generated carriers. Optical and Electrochemical characterizations indicated that the photogenerated electrons and holes can be separated efficiently and the composites have visible light absorption. The experimental results show that, the removal efficiency of the optimal composites for photocatalytic degradation of Tetracycline Hydrochloride (TC) under visible light ( λ ≥ 420 nm) was 86.67% due to the ·O 2 − free radicals of efficient production, it exhibited 5 times higher degradation rate towards Tetracycline Hydrochloride (TC) than pure TiO 2 . The composites with high photocatalytic activity could also effectively degrade Methylthionine Chloride (MB), Xylenol Orange (XO), Acid Red 18 and Rhodamine B (RhB) under the driving of visible light. This work provided a simple method to construct ternary heterojunction, and also provided a promising strategy to solve the environmental pollution problem in the future.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Xuesheng Liu,Xueli Li,Xuewei Liu,Sisi He,Junsu Jin,Hong Meng
To improve the photocatalytic performance of ZnO nanoparticles , based on the collective effect as electron sink of Ag and perfect two-dimensional (2-D) feature of graphene, Ag-ZnO-rGO nanoparticles were prepared by polyvinyl alcohol assisted freeze-drying and subsequent hydrothermal reduction method. Through photocatalytic degradation of methyl orange solution under UV irradiation , all as-prepared samples were assessed and compared with those of published works. The surface morphology , microstructure and optical property of materials were systematically studied by XRD , XPS , SEM , TEM and DRS , respectively. XPS and Raman spectra results confirmed that GO has successfully been reduced to rGO; SEM and TEM characterizations manifested that Ag-ZnO NPs were uniformly distributed in rGO with two-dimensional sheets structure; DRS characterization and Kubelka-Munk formula calculation illustrated that Ag-ZnO-rGO exhibited the smallest band gap and the best optical absorption performance. Moreover, the photocatalytic degradation results indicated that Ag-ZnO-rGO NPs combine the advantages of graphene and Ag which not only has significant adsorption but also maintains high photoreactivity.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xianyu Lei,Yang Cao,Qianlin Chen,Xianquan Ao,Yu Fang,Baojun Liu
Tetracycline hydrochloride (TC) is a broad-spectrum antibiotic extensively used in medical and veterinary fields. However, its excess harms the environment and human health. Recently, construction of CuO/ZnO heterojunctions has a very good effect in the treatment of organic matter in water. In this study, we used zeolite imidazolate framework (ZIF-8) as initial material to synthesize porous and hollow CuO/ZnO photocatalysts for catalytic degradation of TC. The results show that the synthesized CuO/ZnO has the characteristics of porous hollow polyhedron when the molar ratio of Cu and Zn is 0.1. Obviously, photocatalytic degradation rate was better comparing to CuO/ZnO nanoparticles as well as pure ZnO and CuO particles, respectively, which could reach 87% at 60 min under visible light (λ > 420 nm) and has good stability. Porous hollow CuO/ZnO composites are very promising for effective and environmentally friendly degradation of tetracycline hydrochloride in water.
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高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Xiaojing Zhi,Tian Gan,Nianjun Hou,Lijun Fan,Tongtong Yao,Jun Wang,Yicheng Zhao,Yongdan Li
Ni 1-x Zn x O-Ce 0.8 Sm 0.2 O 1.9 is studied as an anode material for solid oxide fuel cells with hydrogen and methanol as fuels. After reduction, Zn is incorporated into the lattice of Ni when x is less than 0.5, while NiZn alloy accompanied with ZnO is formed when x reaches 0.8. The electrochemical oxidation process of H 2 on the anode is investigated with a symmetric cell under various H 2 partial pressures. The addition of Zn increases the electron cloud density of Ni and thus weakens the adsorbing strength of H on Ni, accelerating the surface diffusion of H species, which is the rate determining step when the content of Zn is lower than 0.5. ZnO in the reduced Ni 0·2 Zn 0·8 O- Ce 0.8 Sm 0.2 O 1.9 anode facilitates H spillover, resulting in the variation of the rate determining step and the highest activity of the anode. The cell with Ni 0·2 Zn 0·8 O- Ce 0.8 Sm 0.2 O 1.9 anode shows the highest performance with both H 2 and methanol fuels at 700 °C. ZnO also improves coking resistance of NiO-Ce 0.8 Sm 0.2 O 1.9 anode.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 24
·25286-25300
·
IF 2.914
Liu Fang,Che Yangli,Chai Qingwen,Zhao Mengfei,Lv Yan,Sun Hui,Wang Yongqiang,Sun Juan,Zhao Chaocheng
Copper and zinc composite oxides (Cu 2 O/ZnO) were synthesized by an impregnation-reduction-air oxidation method. A series of Cu 2 O/ZnO/rGO ternary composites were prepared by coupling with graphene oxide (GO) with different mass fractions in a solvothermal reaction system. The microscopic morphology, crystal structure, and optical characteristics of the photocatalysts were characterized. The degradation of p-Nitrophenol (PNP) and polyacrylamide (PAM) by photocatalytic materials under simulated solar irradiation were studied, and the degradation kinetics were also investigated. The results showed that cubic Cu 2 O was modified by ZnO nanorods and distributed on rGO nanosheets. The ternary Cu 2 O/ZnO/rGO nanocomposites have stronger simulated solar absorption ability and higher photodegradation efficiency than pure ZnO and binary Cu 2 O/ZnO nanocomposites. When the amount of Cu 2 O/ZnO/rGO-10 was 0.3 g L −1 , the degradation rate of 10 mg L −1 PNP reached 98% at 90 min and 99.6% of 100 mg L −1 PAM at 30 min. The photocatalytic degradation processes of PNP and PAM all followed the pseudo-first-order kinetic model. Free radical trapping experiments showed that superoxide radicals were the main active substances to improve photocatalytic efficiency. In addition, after four recycles, the catalytic efficiency of Cu 2 O/ZnO/rGO-10 was still over 90%. It showed that Cu 2 O/ZnO/rGO-10 was a promising catalyst for wastewater treatment because of its good photostability and reusability.
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PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
·
IF 3.261
Qinghua Weng,Xiaona Zheng,Siying Zhang,Lili Zhu,Qijie Huang,Penghui Liu,Xiaofen Li,Jie Kang,Zhizhong Han
In this work, ZnO flower-rod arrays (ZnO FRs) were prepared by chemical deposition method and sensitized with natural pigment. The main component of natural pigment was chlorophyll which was extracted from fresh Ficus lacor leaves with simple method. And then a photoelectrochemical (PEC) immunosensor was constructed based on the natural pigment sensitized ZnO FRs (NP-ZnO FRs) and used to detect alpha-fetoprotein (AFP). The results show that the absorbance spectrum of visible light is enhanced for NP-ZnO FRs compared with pure ZnO and the photocurrent is strengthened. The electron transfer is restricted at the interface of ZnO and AFP due to the insulativity of the protein, therefore, the photocurrent is changed. In the measurement range of 0.005–50 ng·mL −1 , the logarithm of the measured concentrations ( c ) has a good linear relationship with the output photocurrent of the immunosensor. The rapid and accurate detection of AFP by the developed PEC immunosensor is realized. Moreover, the PEC immunosensor has high stability and is used to test AFP in the serum of clinical patients. Compared with ELISA method, the result by the PEC immunosensor is reliable. It means that the proposed method has good applicability and this work pave a way to construct visible light PEC biosensor.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 24
·23736-23747
·
IF 2.8
Wang Fayuan,Jing Xinxin,Adams Catharine A.,Shi Zhaoyong,Sun Yuhuan
ZnO nanoparticles (NPs) are applied in a wide variety of applications and frequently accumulate in the environment, thus posing risks to the environment and human health. Arbuscular mycorrhizal (AM) fungi (AMF) associate symbiotically with roots of most higher plants, helping their host plants acquire phosphorus (P). AMF can reduce the toxicity of ZnO NPs, but the benefits of AMF to host plants highly vary with soil available P. We hypothesize that organic P may help AMF to alleviate ZnO NP phytotoxicity. Here, we investigated the effects of inoculation with Funneliformis mosseae on plant growth and Zn accumulation, using maize grown in soil-sand mix substrates spiked with ZnO NPs (0 or 500 mg kg −1 ) under different organic P supply levels (0, 20, or 50 mg kg −1 ). The results showed addition of ZnO NPs inhibited root colonization rate, increased the shoot/root P concentration ratio, and led to significant Zn accumulation in soil and plants. As predicted, AM effects on maize plants all varied with P supply levels, both with or without ZnO NP additions. Organic P interacted synergistically with AMF to promote plant growth and acquisition of P, N, K, Fe, and Cu. AM inoculation reduced the bioavailable Zn released from ZnO NPs and decreased the concentrations and translocation of Zn to maize shoots. In conclusion, ZnO NPs caused excess Zn in soil and plants, posing potential environmental risks. However, our present results first demonstrate that organic P exhibited similar positive effects to AMF and interacted synergistically with AMF to improve plant growth and nutrition, and to decrease Zn accumulation and partitioning in plants, and thus helped diminish the adverse effects induced by ZnO NPs.
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高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2018
·Vol. 33
·期 10
·1506-1514
·
IF 1.495
Yunchuan Qi,Ce Zhang,Shengtang Liu,Yanqing Zong,Yi Men
In this study, a facile room-temperature solution method is developed for the preparation of zinc oxide@graphene oxide (ZnO@GO) nanocomposites. Unlike the general process to obtain crystallized materials by heating, the room temperature we used can generate fine ZnO@GO nanocomposites with ultra-small ZnO nanocrystal (∼8 nm) and high weight content (∼84%). The obtained ZnO@GO nanocomposite was thoroughly characterized by various physicochemical techniques such as scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy, indicating well-dispersed ZnO on the GO layer and strong interaction between the each other. As an anode material for lithium-ion batteries, ZnO@GO exhibits high specific reversible capacity and excellent cycling performance, which can be ascribed to the role of GO in preventing the agglomeration of the ZnO nanoparticles by creating the decorated nanoscale composite during the electrochemical process.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Ying-Chu Chen,Hao-Hsuan Chang,Yu-Kuei Hsu
Decoration of CuInS2 (CIS) quantum dots (QDs) on ZnO nanowires (NWs) with an interlayer of In2S3 as photoelectrode has been successfully fabricated on FTO via the simple solution routes for photoelectrochemical (PEC) application. Scanning electron microscopy, transmission electron microscopy, and X-ray diffraction are utilized to systematically analyze the morphology and structure of the CIS QD/In2S3/ZnO NWs heterostructure. The composition of this multilayer heterostructure and the removal of QD ligands by a thermal process are confirmed by X-ray photoelectron spectra. In comparison with CIS QDs/ZnO NWs, the CIS QD/In2S3/ZnO heterostructural photoelectrode displays an efficient charge separation and carrier transport path for photocurrent up to 2.4 mA·cm–2 that is competitive with other Cd- and Pb-free QD-based materials. In addition, Mott–Schottky analysis demonstrates the negative shift of the flat band in the CIS QD/In2S3/ZnO, which benefits the early onset potential. Significantly, this hierarchical photoelectrode shows the improvement the absorption and conversion of solar light in the visible region obtained using a pristine ZnO structure. Our research paves the way for exploring lead-free and lead-free sulfide materials in the new category of solar applications.
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Journal of Saudi Chemical Society
·
2018
·
IF 2.456
Sajid ur Rehman,Jian Liu,Rida Ahmed,Hong Bi
Three-dimensional (3D) ZnO microspheres with the composite of polyaniline (PANI) have been successfully synthesized by one-pot solvothermal and in-suit polymerization method. The obtained microspheres were uniform having the diameter of 4 μm–7 μm. These microspheres, inside cushion of PANI polymer, exhibit excellent microwave absorption properties. Composite of ZnO microspheres with PANI increased the complex permeability and enhanced the dielectric loss. Thus, the microwave absorption properties of the composite have been intensified. Despite the fact that the composite of ZnO with PANI herein dissipate the microwaves by dielectric loss, their performance is admirable compared to most of PANI-based composites reported. The morphological, structural and spectral properties have been investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and the Fourier transform infrared (FT-IR). It is found that the maximum reflection loss value of ZnO@PANI reaches −41 dB at 14 GHz with a thickness of 3.5 mm that is superior to the previously reported composite of PANI with other materials.
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Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Lei Bai,Xiaoli Zhang,Zhijie Ding,Xuchun Wang,Youju Huang,Palanisamy Kannan
Synthesis of silver/zinc oxide heterostructured nanorods (Ag/ZnO HNRs) is demonstrated via a simple one-step solvothermal method. The size of silver nanoparticles (AgNPs) on zinc oxide nanorods (ZnO NRs) are tuned by controlling the amount of AgNO 3 and the optimized decoration of AgNPs significantly enhance the utilization of visible light. Particularly, the Ag/ZnO HNRs samples are used to examine the photocatalytic degradation of methyl orange (MO) and reduction of potassium dichromate (K 2 Cr 2 O 7 ). The obtained results display that the Ag/ZnO HNRs possess surprising photocatalytic activities towards the removal of MO and reduction of K 2 Cr 2 O 7 . Further, the photocatalytic activities are related with the size of AgNPs and the length of ZnO NRs. Finally, the investigation towards the degradation of other dye molecules such as rhodamine B (RhB), and methyl blue (MB) along with MO at higher concentrations from morning to evening upon exposing sunlight under static condition. The present work could provide a further insight into the synthesis of ZnO based heterostructured photocatalysts and their application in efficient water treatment under natural conditions.
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