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Article ; Online: Recent Trends and Advances of Co 3 O 4 Nanoparticles in Environmental Remediation of Bacteria in Wastewater

Anuoluwapo Anele / Sherine Obare / Jianjun Wei

Nanomaterials, Vol 12, Iss 1129, p

2022 Volume 1129

Abstract: Antibiotic resistance is a formidable global threat. Wastewater is a contributing factor to the prevalence of antibiotic-resistant bacteria and genes in the environment. There is increased interest evident from research trends in exploring nanoparticles ... ...

Abstract	Antibiotic resistance is a formidable global threat. Wastewater is a contributing factor to the prevalence of antibiotic-resistant bacteria and genes in the environment. There is increased interest evident from research trends in exploring nanoparticles for the remediation of antibiotic-resistant bacteria. Cobalt oxide (Co 3 O 4 ) nanoparticles have various technological, biomedical, and environmental applications. Beyond the environmental remediation applications of degradation or adsorption of dyes and organic pollutants, there is emerging research interest in the environmental remediation potential of Co 3 O 4 nanoparticles and its nanocomposites on antibiotic-resistant and/or pathogenic bacteria. This review focuses on the recent trends and advances in remediation using Co 3 O 4 nanoparticles and its nanocomposites on antibiotic-resistant or pathogenic bacteria from wastewater. Additionally, challenges and future directions that need to be addressed are discussed.
Keywords	anti-bacterial agents ; bacteria ; drug resistance ; antibiotics ; antibiotic resistance ; antibacterial mechanism ; Chemistry ; QD1-999
Language	English
Publishing date	2022-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Dark-Field Microscopic Study of Cellular Uptake of Carbon Nanodots

Wendi Zhang / Zuowei Ji / Zheng Zeng / Anitha Jayapalan / Bhawna Bagra / Alex Sheardy / Peng He / Dennis R. LaJeunesse / Jianjun Wei

Molecules, Vol 27, Iss 8, p

Nuclear Penetrability

2022 Volume 2437

Abstract: Carbon nanodots are fascinating candidates for the field of biomedicine, in applications such as bioimaging and drug delivery. However, the nuclear penetrability and process are rarely studied and lack understanding, which limits their applications for ... ...

Abstract	Carbon nanodots are fascinating candidates for the field of biomedicine, in applications such as bioimaging and drug delivery. However, the nuclear penetrability and process are rarely studied and lack understanding, which limits their applications for drug carriers, single-molecule detection and live cell imaging. In this study, we attempt to examine the uptake of CNDs in cells with a focus on the potential nuclear penetrability using enhanced dark-field microscopy (EDFM) associated with hyperspectral imaging (HSI) to quantitatively determine the light scattering signals of CNDs in the cells. The effects of both CND incubation time and concentration are investigated, and plausible nuclear penetration involving the nuclear pore complex (NPC) is discussed. The experimental results and an analytical model demonstrate that the CNDs’ uptake proceeds by a concentration-dependent three-stage behavior and saturates at a CND incubation concentration larger than 750 µg/mL, with a half-saturated concentration of 479 μg/mL. These findings would potentially help the development of CNDs’ utilization in drug carriers, live cell imaging and other biomedical applications.
Keywords	nitrogen-doped carbon nanodots ; cellular uptake ; light scattering ; enhanced dark-field microscopy ; hyperspectral imaging ; nuclear penetration ; Organic chemistry ; QD241-441
Language	English
Publishing date	2022-04-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Magnetoreception of Photoactivated Cryptochrome 1 in Electrochemistry and Electron Transfer

Zheng Zeng / Jianjun Wei / Yiyang Liu / Wendi Zhang / Taylor Mabe

ACS Omega, Vol 3, Iss 5, Pp 4752-

2018 Volume 4759

Keywords	Chemistry ; QD1-999
Language	English
Publishing date	2018-05-01T00:00:00Z
Publisher	American Chemical Society
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Equity and efficiency of health care resource allocation in Jiangsu Province, China

Qian Li / Jianjun Wei / Fengchang Jiang / Guixiang Zhou / Rilei Jiang / Meijuan Chen / Xu Zhang / Wanjin Hu

International Journal for Equity in Health, Vol 19, Iss 1, Pp 1-

2020 Volume 13

Abstract: Abstract Background Jiangsu was one of the first four pilot provinces to engage in comprehensive health care reform in China, which has been on-going for the past 5 years. This study aims to evaluate the equity, efficiency and productivity of health care ...

Abstract	Abstract Background Jiangsu was one of the first four pilot provinces to engage in comprehensive health care reform in China, which has been on-going for the past 5 years. This study aims to evaluate the equity, efficiency and productivity of health care resource allocation in Jiangsu Province using the most recent data, analyse the causes of deficiencies, and discuss measures to solve these problems. Methods Data were extracted from the Jiangsu Health/Family Planning Statistical Yearbook (2015–2019) and Jiangsu Statistical Yearbook (2015–2019). The Gini coefficient (G), Theil index (T) and health resource density index (HRDI) were chosen to study the fairness of health resource allocation in Jiangsu Province. Data envelopment analysis (DEA) and the Malmquist productivity index (MPI) were used to analyse the efficiency and productivity of this allocation. Results From 2014 to 2018, the total amount of health resources in Jiangsu Province increased. The G of primary resource allocation by population remained below 0.15, and that by geographical area was between 0.14 and 0.28; additionally, the G of health financial resources was below 0.26, and that by geographical area was above 0.39. T was consistent with the results for G and Lorenz curves. The HRDI shows that the allocated amounts of health care resources were the highest in southern Jiangsu, except for the number of health institutions. The average value of TE was above 0.93, and the DEA results were invalid for only two cities. From 2014 to 2018, the mean TFPC in Jiangsu was less than 1, and the values exceeded 1 for only five cities. Conclusion The equity of basic medical resources was better than that of financial resources, and the equity of geographical allocation was better than that of population allocation. The overall efficiency of health care resource allocation was high; however, the total factor productivity of the whole province has declined due to technological regression. Jiangsu Province needs to further optimize the allocation and increase ...
Keywords	Health care resource ; Equity ; Efficiency ; Productivity ; Public aspects of medicine ; RA1-1270
Subject code	360
Language	English
Publishing date	2020-11-01T00:00:00Z
Publisher	BMC
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Recent advances in surface-enhanced raman spectroscopy (SERS): Finite-difference time-domain (FDTD) method for SERS and sensing applications

Zeng, Zheng / Jianjun Wei / Yiyang Liu

Trends in analytical chemistry. 2016 Jan., v. 75

2016

Abstract: There have been significant advancements in the field of surface-enhanced Raman spectroscopy (SERS). Despite being an ultra-sensitive analytical technique, challenges, such as how to get a proper match between the SERS substrate and light for better ... ...

Abstract	There have been significant advancements in the field of surface-enhanced Raman spectroscopy (SERS). Despite being an ultra-sensitive analytical technique, challenges, such as how to get a proper match between the SERS substrate and light for better signal enhancement to obtain a stable, sensitive SERS substrate, prevent its widespread applications. Finite-difference time-domain (FDTD) method, a numerical tool for modeling computational electrodynamics, has recently been used to investigate SERS for understanding the underlying physics, and optimally design and fabricate SERS substrates for molecular analysis. In this review, we summarize the trend of using FDTD method in SERS studies by providing an introduction of fundamental principles, the studies of optical responses, electromagnetic (EM) field distribution, enhancement factor (EF) of SERS, the application in design and fabrication of SERS substrates, and SERS for biosensing and environmental analysis. Finally, the critical issues of using inherently approximate FDTD method and future improvement for solving EM problems and SERS applications are discussed.
Keywords	environmental assessment ; models ; physics ; Raman spectroscopy
Language	English
Dates of publication	2016-01
Size	p. 162-173.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	2014041-1
ISSN	0165-9936
ISSN	0165-9936
DOI	10.1016/j.trac.2015.06.009
Database	NAL-Catalogue (AGRICOLA)

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Article: Low-temperature co-purification of NOx and Hg0 from simulated flue gas by CexZryMnzO2/r-Al2O3: the performance and its mechanism

Lu, Pei / Huifang Yue / Yi Xing / Jianjun Wei / Zheng Zeng / Rui Li / Wanrong Wu

Environmental science and pollution research international. 2018 July, v. 25, no. 21

2018

Abstract: In this study, series of CeₓZryMnzO₂/r-Al₂O₃ catalysts were prepared by impregnation method and explored to co-purification of NOₓ and Hg⁰ at low temperature. The physical and chemical properties of the catalysts were investigated by XRD, BET, FTIR, NH₃- ... ...

Abstract	In this study, series of CeₓZryMnzO₂/r-Al₂O₃ catalysts were prepared by impregnation method and explored to co-purification of NOₓ and Hg⁰ at low temperature. The physical and chemical properties of the catalysts were investigated by XRD, BET, FTIR, NH₃-TPD, H₂-TPR, and XPS. The experimental results showed that 10% Ce₀.₂Zr₀.₃Mn₀.₅O₂/r-Al₂O₃ yielded higher conversion on co-purification of NOₓ and Hg⁰ than the other prepared catalysts at low temperature, especially at 200–300 °C. 91% and 97% convert rate of NOₓ and Hg⁰ were obtained, respectively, when 10% Ce₀.₂Zr₀.₃Mn₀.₅O₂/r-Al₂O₃ catalyst was used at 250 °C. Moreover, the presence of H₂O slightly decreased the removal of NOₓ and Hg⁰ owing to the competitive adsorption of H₂O and Hg⁰. When SO₂ was added, the removal of Hg⁰ first increased slightly and then presented a decrease due to the generation of SO₃ and (NH₄)₂SO₄. The results of NH₃-TPD indicated that the strong acid of 10% Ce₀.₂Zr₀.₃Mn₀.₅O₂/r-Al₂O₃ improved its high-temperature activity. XPS and H₂-TPR results showed there were high-valence Mn and Ce species in 10% Ce₀.₂Zr₀.₃Mn₀.₅O₂/r-Al₂O₃, which could effectively promote the removal of NOₓ and Hg⁰. Therefore, the mechanisms of Hg⁰ and NOₓ removal were proposed as Hg (ad) + [O] → HgO (ad), and 2NH₃/NH₄⁺ (ad) + NO₂ (ad) + NO (g) → 2 N₂ + 3H₂O/2H⁺, respectively. Graphical abstract ᅟ
Keywords	Fourier transform infrared spectroscopy ; X-ray diffraction ; X-ray photoelectron spectroscopy ; adsorption ; ammonium sulfate ; catalysts ; flue gas ; manganese ; mercury ; nitric oxide ; nitrogen ; nitrogen dioxide ; physicochemical properties ; sulfur dioxide ; temperature
Language	English
Dates of publication	2018-07
Size	p. 20575-20590.
Publishing place	Springer Berlin Heidelberg
Document type	Article
ZDB-ID	1178791-0
ISSN	1614-7499 ; 0944-1344
ISSN (online)	1614-7499
ISSN	0944-1344
DOI	10.1007/s11356-018-2199-4
Database	NAL-Catalogue (AGRICOLA)

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Article: Simultaneous oxidation of Hg0 and NH3-SCR of NO by nanophase Ce x Zr y Mn z O2 at low temperature: the interaction and mechanism

Wu, Wanrong / Huifang Yue / Jianjun Wei / Pei Lu / Rui Li / Yi Xing / Zheng Zeng

Environmental science and pollution research international. 2018 May, v. 25, no. 15

2018

Abstract: Simultaneous oxidation of Hg0 and NH3-SCR of NO by catalyst is one of the key methods for co-purification of coal-fired flue gas. Till now, the interaction between the oxidation of Hg0 and NH3-SCR of NO and its mechanism have not clarified. In this study, ...

Abstract	Simultaneous oxidation of Hg0 and NH3-SCR of NO by catalyst is one of the key methods for co-purification of coal-fired flue gas. Till now, the interaction between the oxidation of Hg0 and NH3-SCR of NO and its mechanism have not clarified. In this study, a series of nanophase Ce x Zr y Mn z O2 was prepared for the simultaneous oxidation of Hg0 and NH3-SCR of NO at low temperature. The catalysts were characterized using surface area analysis, X-ray diffraction, temperature-programmed techniques, and several types of microscopy and spectroscopy. The experimental results indicated that the Ce0.47Zr0.22Mn0.31O2 exhibited superior Hg0 removal efficiency (> 99%) and NO conversion efficiency (> 90%) even at 150 °C, and it also exhibited a good durability in the presence of SO2 and H2O. The excellent performance of Ce0.47Zr0.22Mn0.31O2 on co-purifying Hg0 and NO was due to the stronger synergistic effects of Ce-Zr-Mn in Ce0.47Zr0.22Mn0.31O2 than that of the others, which was illustrated by the characterization results of XPS, XRD, and FT-IR. Moreover, it was found that the NO conversion of Ce0.47Zr0.22Mn0.31O2 could be slightly influenced by Hg0 and was decreased about 4% to the max, while that of Hg0 could rarely be affected by the selected catalytic reduction process of NO. It might be due to the co-purification mechanism of NO and Hg0. The mechanism of the simultaneous oxidation of Hg0 and NH3-SCR of NO was mainly due to the synergetic effect on the mobility of surface oxygen and the activation of lattice oxygen of Ce0.47Zr0.22Mn0.31O2. The effect of the oxidation of Hg0 on the NH3-SCR of NO was mainly due to the absorbed Hg0/Hg2+ on the surface of Ce0.47Zr0.22Mn0.31O2, which attenuated the formation of NH3(ad), −NH2(ad), and NH4+ on its acid sites. Similarly, the NH3-SCR of NO process could hardly influence the oxidation of Hg0 when NO and Hg0 were co-purified.
Keywords	ammonium ; catalysts ; coal ; durability ; flue gas ; Fourier transform infrared spectroscopy ; manganese ; mercury ; microscopy ; nitric oxide ; oxidation ; oxygen ; sulfur dioxide ; surface area ; synergism ; temperature ; X-ray diffraction ; X-ray photoelectron spectroscopy ; zirconium
Language	English
Dates of publication	2018-05
Size	p. 14471-14485.
Publishing place	Springer Berlin Heidelberg
Document type	Article
ZDB-ID	1178791-0
ISSN	1614-7499 ; 0944-1344
ISSN (online)	1614-7499
ISSN	0944-1344
DOI	10.1007/s11356-018-1657-3
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Tuning the Functional Groups on Carbon Nanodots and Antioxidant Studies

Zuowei Ji / Alex Sheardy / Zheng Zeng / Wendi Zhang / Harish Chevva / Kokougan Allado / Ziyu Yin / Jianjun Wei

Molecules, Vol 24, Iss 1, p

2019 Volume 152

Abstract: Carbon nanodots (CNDs) have shown good antioxidant capabilities by scavenging oxidant free radicals such as diphenyl-1-picrylhydrazyl radical (DPPH•) and reactive oxygen species. While some studies suggest that the antioxidation activities associate to ... ...

Abstract	Carbon nanodots (CNDs) have shown good antioxidant capabilities by scavenging oxidant free radicals such as diphenyl-1-picrylhydrazyl radical (DPPH•) and reactive oxygen species. While some studies suggest that the antioxidation activities associate to the proton donor role of surface active groups like carboxyl groups (–COOH), it is unclear how exactly the extent of oxidant scavenging potential and its related mechanisms are influenced by functional groups on CNDs’ surfaces. In this work, carboxyl and the amino functional groups on CNDs’ surfaces are modified to investigate the individual influence of intermolecular interactions with DPPH• free radical by UV-Vis spectroscopy and electrochemistry. The results suggest that both the carboxyl and the amino groups contribute to the antioxidation activity of CNDs through either a direct or indirect hydrogen atom transfer reaction with DPPH•.
Keywords	carbon nanodots ; functional groups ; antioxidation ; radical scavenging ; electro-chemistry ; charge transfer ; Organic chemistry ; QD241-441
Subject code	540
Language	English
Publishing date	2019-01-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Modulation of Macrophage Polarization by Carbon Nanodots and Elucidation of Carbon Nanodot Uptake Routes in Macrophages

Andrew Dunphy / Kamal Patel / Sarah Belperain / Aubrey Pennington / Norman H. L. Chiu / Ziyu Yin / Xuewei Zhu / Brandon Priebe / Shaomin Tian / Jianjun Wei / Xianwen Yi / Zhenquan Jia

Nanomaterials, Vol 11, Iss 1116, p

2021 Volume 1116

Abstract: Atherosclerosis represents an ever-present global concern, as it is a leading cause of cardiovascular disease and an immense public welfare issue. Macrophages play a key role in the onset of the disease state and are popular targets in vascular research ... ...

Abstract	Atherosclerosis represents an ever-present global concern, as it is a leading cause of cardiovascular disease and an immense public welfare issue. Macrophages play a key role in the onset of the disease state and are popular targets in vascular research and therapeutic treatment. Carbon nanodots (CNDs) represent a type of carbon-based nanomaterial and have garnered attention in recent years for potential in biomedical applications. This investigation serves as a foremost attempt at characterizing the interplay between macrophages and CNDs. We have employed THP-1 monocyte-derived macrophages as our target cell line representing primary macrophages in the human body. Our results showcase that CNDs are non-toxic at a variety of doses. THP-1 monocytes were differentiated into macrophages by treatment with 12- O -tetradecanoylphorbol-13-acetate (TPA) and co-treatment with 0.1 mg/mL CNDs. This co-treatment significantly increased the expression of CD 206 and CD 68 (key receptors involved in phagocytosis) and increased the expression of CCL2 (a monocyte chemoattractant and pro-inflammatory cytokine). The phagocytic activity of THP-1 monocyte-derived macrophages co-treated with 0.1 mg/mL CNDs also showed a significant increase. Furthermore, this study also examined potential entrance routes of CNDs into macrophages. We have demonstrated an inhibition in the uptake of CNDs in macrophages treated with nocodazole (microtubule disruptor), N-phenylanthranilic acid (chloride channel blocker), and mercury chloride (aquaporin channel inhibitor). Collectively, this research provides evidence that CNDs cause functional changes in macrophages and indicates a variety of potential entrance routes.
Keywords	carbon nanodots ; macrophages ; polarization ; phagocytosis ; uptake routes ; Chemistry ; QD1-999
Subject code	616
Language	English
Publishing date	2021-04-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: New insight into advection of organic contaminate plume at drain outlet areas

Lu, Pei / Jianjun Wei / Wang Wen / Yuanxin Huang / Zheng Zeng

Environmental nanotechnology, monitoring & management. 2016 Dec., v. 6

2016

Abstract: To provide insight to optimize organic contaminants treatment at the drain outlet areas due to the discharge from the industrial plants, the fate and transport of variety kinds of organic contaminants were investigated. By taking the chemical properties ( ...

Abstract	To provide insight to optimize organic contaminants treatment at the drain outlet areas due to the discharge from the industrial plants, the fate and transport of variety kinds of organic contaminants were investigated. By taking the chemical properties (molecular weight (MW), Henry’s law constant (H), vapor pressure (Pv), organic carbon normalized soil-water partition coefficient for organic compounds (Koc), water solubility (S), air diffusivity (Da), and water diffusivity (Dw)) of 56 kinds of organic chemical into account, we studied the general transport equation (GTE) regarding the mass balance for the steady-state analysis of the accumulation of a chemical over time by the plume advection. We found that Koc has significant relationship with S and MW of the chemicals. Furthermore, higher organic carbon-water partitioning coefficient of the chemical will make it easier to stay at the drain outlet area, which gives us hints for next research of nanoscale particles for in situ remediation.
Keywords	advection ; air ; diffusivity ; equations ; molecular weight ; monitoring ; nanoparticles ; organic carbon ; organic compounds ; remediation ; soil water ; vapor pressure ; water solubility
Language	English
Dates of publication	2016-12
Size	p. 76-82.
Publishing place	Elsevier B.V.
Document type	Article
ISSN	2215-1532
DOI	10.1016/j.enmm.2016.08.001
Database	NAL-Catalogue (AGRICOLA)

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