Publications by authors named "Junhao Cao"

4 Publications

  • Page 1 of 1

Extraction and identification methods of microplastics and nanoplastics in agricultural soil: A review.

J Environ Manage 2021 Sep 7;294:112997. Epub 2021 Jun 7.

The UWA Institute of Agriculture and School of Agriculture & Environment, The University of Western Australia, Perth, WA, 6001, Australia.

As the abundance of microplastics and nanoplastics (MPs/NPs) increases in the environment, their presence in agricultural soil has become of interest. MPs/NPs can affect soil physical and chemical properties and be absorbed by plants and soil animals, causing physical and chemical damage. Soil MPs exceeding a certain concentration cause significant harm. Therefore, the extraction and identification of MPs in soil are vital for determining soil pollution. However, soils contain many other particles of similar size to MPs/NPs, making it more difficult to distinguish them than in water bodies. No standardized extraction and identification method is available to quantify MPs/NPs in soil. Various methods have been described in the literature, but they involve many different procedures for sampling, purification, digestion, and identification. This paper reviews extraction and identification methods for MPs/NPs in soil, sediment, and water and summarizes agricultural soil sampling and preservation, MPs/NPs separation, organic matter removal, and MPs/NPs identification. We also compare the advantages and disadvantages of existing methods and propose future research topics.
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http://dx.doi.org/10.1016/j.jenvman.2021.112997DOI Listing
September 2021

A rational design of g-CN-based ternary composite for highly efficient H generation and 2,4-DCP degradation.

J Colloid Interface Sci 2021 Oct 20;599:484-496. Epub 2021 Apr 20.

Engineering Research Center for Functional Ceramics of the Ministry of Education, School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China; Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China. Electronic address:

In this work, g-CN based ternary composite (CeO/CN/NH-MIL-101(Fe)) has been fabricated via hydrothermal and wet-chemical methods. The composite showed superior photoactivities for HO reduction to produce H and 2,4-dichlorophenol (2,4-DCP) degradation. The amount of H evolved over the composite under visible and UV-visible irradiations is 147.4 µmol·g·h and 556.2 µmol·g·h, respectively. Further, the photocatalyst degraded 87% of 2,4-DCP in 2 hrs under visible light irradiations. The improved photoactivities are accredited to the synergistic-effects caused by the proper band alignment with close interfacial contact of the three components that significantly promoted charge transfer and separation. The 2,4-DCP degradation over the composite is dominated by OH radical rather than h and O as investigated by scavenger trapping experiments. This is further supported by the electron para-magnetic resonance (EPR) study. This work provides new directions for the development of g-CN based highly efficient ternary composite materials for clean energy generation and pollution control.
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http://dx.doi.org/10.1016/j.jcis.2021.04.049DOI Listing
October 2021

Experimental and DFT Studies of Au Deposition Over WO/g-CN Z-Scheme Heterojunction.

Nanomicro Lett 2019 Dec 19;12(1). Epub 2019 Dec 19.

Engineering Research Center for Functional Ceramics of the Ministry of Education, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China.

A typical Z-scheme system is composed of two photocatalysts which generate two sets of charge carriers and split water into H and O at different locations. Scientists are struggling to enhance the efficiencies of these systems by maximizing their light absorption, engineering more stable redox couples, and discovering new O and H evolutions co-catalysts. In this work, Au decorated WO/g-CN Z-scheme nanocomposites are fabricated via wet-chemical and photo-deposition methods. The nanocomposites are utilized in photocatalysis for H production and 2,4-dichlorophenol (2,4-DCP) degradation. It is investigated that the optimized 4Au/6% WO/CN nanocomposite is highly efficient for production of 69.9 and 307.3 µmol h g H gas, respectively, under visible-light (λ > 420 nm) and UV-visible illumination. Further, the fabricated 4Au/6% WO/CN nanocomposite is significant (i.e., 100% degradation in 2 h) for 2,4-DCP degradation under visible light and highly stable in photocatalysis. A significant 4.17% quantum efficiency is recorded for H production at wavelength 420 nm. This enhanced performance is attributed to the improved charge separation and the surface plasmon resonance effect of Au nanoparticles. Solid-state density functional theory simulations are performed to countercheck and validate our experimental data. Positive surface formation energy, high charge transfer, and strong non-bonding interaction via electrostatic forces confirm the stability of 4Au/6% WO/CN interface.
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http://dx.doi.org/10.1007/s40820-019-0345-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7770730PMC
December 2019

Epidemiological and etiological characteristics of hand, foot, and mouth disease in Wuhan, China from 2012 to 2013: outbreaks of coxsackieviruses A10.

J Med Virol 2015 Jun 9;87(6):954-60. Epub 2015 Mar 9.

Department of Medical Laboratory, Wuhan General Hospital of Guangzhou Command, Wuhan, China.

Hand-foot-mouth disease (HFMD) is a common infectious disease which often occurs in young children. It is caused by enteroviruses, most commonly enterovirus71 (EV71) and Coxsackievirus A16 (CVA16). The present study focuses on the molecular epidemiology of the pathogen of HFMD in the Wuhan region of China during the period 2012 to 2013. A total of 463 viruses were isolated from throat swab of 3,208 HFMD patients and analyzed by quantitative RT-PCR with all sets of specific primers for EV71, CVA16, and pan-enterovirus. Of the 463 viruses, 111 (21.2%) were EV71, 52 (9.6%) were CVA16, and 300 (69.2%) were pan-enterovirus. In pan-enterovirus isolations 190 (52.8%) were CVA10, 50 (13.9%) were CVA4, 30 were CB2, 17 were CB3, 13 were CB5 identified by VP4 gene sequencing. Eleven EV71 isolates were complete genome sequenced and phylogenetic analysis revealed that the EV71 strains that circulated in Wuhan belonged to the C4 subgenotype. Among the 190 CVA10 isolations, 187 CVA10 strains have the same nucleotide sequence, the other three CVA10 strains belongs to another type of nucleotide sequence. Phylogenetic analysis based on 19 CVA10 isolations suggested that they belonged to the clade of Chinese strains, but form different clusters isolated from Japan, Europe. This study showed that EVA71 and CVA16 were detected as the predominant viruses (>60%) in 2012 and the total reported HFMD cases attained a peak in June and July. In contrast, CVA10 was also detected during April 2012 and replaced EVA71 and CVA16 as the major HFMD-associated pathogen from May 2013.
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http://dx.doi.org/10.1002/jmv.24151DOI Listing
June 2015
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