CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Xiaojing Zhang,Yue Zhou,Tengfei Xu,Kaiwei Zheng,Rongrong Zhang,Zhaoxue Peng,Hongzhong Zhang
In this study, a sequencing batch reactor (SBR) was operated as Anammox and used as parent reactor. Then three SBRs seeded from the parent reactor were adopted for investigating the effect of CuO, ZnO and TiO 2 nanoparticles (NPs) on nitrogen removal, microbial activity and microbial communities of Anammox. The bioactivities of anaerobic ammonia-oxidizing bacteria (AAOB) after different exposure period were detected by batch experiments. Results showed that NPs performed immediate and durable toxicity on Anammox. The nitrogen removal efficiency decreased to 2.3%, 2.9% and 14.0% from 71%, the Anammox rate decreased to 0.13, 0.16 and 0.75 from 2.76 mg h −1 g −1 VSS, and the relative abundance of AAOB decreased to 2.57%, 2.78% and 2.61% from 7.99%, respectively. CuO and ZnO NPs performed similar effect, while CuO NPs led to the most severe toxicity and lowest accumulative effect. TiO 2 NPs showed the lowest toxicity but most durable suppression on Anammox process.
研究领域:
环境工程
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微生物学
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污水处理
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
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IF 10.753
Bingfeng Chen,Yizhou Pan,Yiling Chen,Zhenyan Zhang,Zhihan Yang,Meng Zheng,Tao Lu,Liying Jiang,Haifeng Qian
Titanium dioxide nanoparticle (n-TiO 2 ) is a widely used nanomaterial, which is inevitably released as a residue into aquatic ecosystems during material production and usage. However, the effects of n-TiO 2 on aquatic microbial communities have not been completely elucidated. This study examined the toxic effects of n-TiO 2 on eukaryotic and prokaryotic microbial communities in freshwater environments. We determined that n-TiO 2 had a greater inhibitory effect on the growth of eukaryotic algae than cyanobacteria in monocultures. A similar phenomenon was observed in a microcosm experiment, revealing that n-TiO 2 slightly reduced the content of chlorophyll-a but evidently increased the phycocyanin content. Moreover, the alpha diversity of the eukaryotic community was not affected, whereas its beta diversity increased with exposure to n-TiO 2 . Although n-TiO 2 altered the composition of freshwater microbial communities, it did not change the functions of the prokaryotic community, which might be attributed to the functional redundancy of microbiota. Co-occurrence network analysis indicated that n-TiO 2 destabilized the freshwater community, especially the eukaryotic community, and potentially disturbed the aquatic ecosystem. Our study revealed that the ecological risk of n-TiO 2 on aquatic microbial communities is complex; hence, rational utilization of n-TiO 2 should be emphasized.
研究领域:
环境科学
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微生物学
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生态学
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产品关联
DOI
PubMed
高影响因子
Energy Technology
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2022
·Vol. 10
·期 10
·2200409
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IF 4.149
Tianming Zhu,Xiaoxi Zuo,Xiaoxin Lin,Zhuoying Su,Jia Li,Ronghua Zeng,Junmin Nan
The separator, as an important inner part of the sodium-ion battery (SIB), has a significant impact on the electrochemical performance and security of the battery. However, conventional polyolefin separators are inapplicable for SIBs due to their poor wettability to liquid electrolytes and unsatisfactory heat resistance. To address these problems, a novel polyethylene (PE)- hydroxyethyl cellulose (HEC)-TiO 2 composite separator modified on the PE matrix is proposed and successfully prepared by a multistep synthesis procedure of HEC coating and TiO 2 in situ self-growth, while almost maintaining the initial separator thickness. Compared with conventional PE separators, this composite separator possesses remarkable wettability which benefits from the introduction of a polar HEC-TiO 2 -incorporated coating. Besides, thanks to a significant improvement in wettability, the separator presents high electrolyte uptake of up to 186.5% and an extraordinary ionic conductivity of 0.342 mS cm −1 . As expected, a Na|Na 3 V 2 (PO 4 ) 3 battery with the PE-HEC-TiO 2 separator exhibits a reversible capacity of 99.0 mAh g −1 and a capacity retention of 94.8% after 1000 cycles at 5 C with a steady Coulombic efficiency of nearly 100%. These brilliant performances convincingly make it a promising separator for advanced SIBs with high reversibility, high capacity, and long life.
研究领域:
材料科学
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能源存储
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纳米技术
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电化学
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DOI
高影响因子
MATERIALS & DESIGN
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2021
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IF 7.991
Baolin Chen,Xun Wang,Xia Gao,Jie Jiang,Mancheng Hu,Shuni Li,Quanguo Zhai,Yucheng Jiang
In this work, TiO 2 nano particle was used for two purposes: it played as a role of a solid carrier for immobilization of HRP, and meanwhile acted as a photo-catalyst itself. In this way, the loss of enzymatic activity during enzyme immobilization can be compensated by the coupling of TiO 2 photo-catalysis. Then, the surface of TiO 2 nanoparticles were modified by phase-transitioned lysozyme (PTL) and connected with horseradish peroxidase (HRP) via a DNA helix ( [email protected] 2 ). The DNA double helix chain was utilized as a flexible spacer arm to keep the flexibility of the immobilized enzyme. The [email protected] 2 showed a high recovered activity (90.52%) of the original activity of free HRP. This data is better than most reported activity recovery of immobilized enzyme. Moreover, [email protected] 2 can maintain high catalytic activity, stability and reusability when degrading phenol in wastewater. The phenol of 0.5 mmol∙L −1 could be totally degraded within 10 min. Moreover, a visual colorimetric method for phenol concentration by [email protected] 2 was established, and the phenol concentration of 0–0.2 mmol∙L −1 can be visually detected with naked eyes. Furthermore, an enzymatic-photocatalytic synergetic effect of [email protected] 2 is found and investigated. The efficiency of [email protected] 2 ensures it a potential application in the wastewater treatment.
研究领域:
环境科学
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化学工程
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生物技术
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED TOXICOLOGY
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2024
·
IF 2.7
Canyang Wang,Zhengzheng Zhou,Yayu He,Juan Li,Yi Cao
Food contaminates, such as insecticide, may influence the toxicity of nanoparticles (NPs) to intestine. The present study investigated the combined toxicity of TiO 2 NPs and fipronil to male mouse intestine. Juvenile mice (8 weeks) were orally exposed to 5.74 mg/kg TiO 2 NPs, 2.5 mg/kg fipronil, or both, once a day, for 5 days. We found that both TiO 2 NPs and fipronil induced some pathological changes in intestines, accompanying with defective autophagy, but these effects were not obviously enhanced after TiO 2 NP and fipronil co-exposure. Fipronil promoted Ti accumulation but induced minimal impact on other trace elements in TiO 2 NP-exposed intestines. Metabolomics data revealed that the exposure altered metabolite profiles in mouse intestines, and two KEGG pathways, namely, ascorbate and aldarate metabolism (mmu00053) and glutathione metabolism (mmu00480), were only statistically significantly changed after TiO 2 NP and fipronil co-exposure. Five metabolites, including 2-deoxy-D-erythro-pentofuranose 5-phosphate, 5alpha-cholestanol, beta-D-glucopyranuronic acid, elaidic acid, and isopentadecanoic acid, and maltotriose, were more significantly up-regulated after the co-exposure, whereas trisaccharide and xylonolactone were only significantly down-regulated by the co-exposure. We concluded that fipronil had minimal impact to enhance the toxicity of TiO 2 NPs to mouse intestines but altered metabolite profiles.
研究领域:
毒理学
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代谢组学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Qi Jiang,Jian Huang,Baoguo Ma,Zhengcai Yang,Ting Zhang,Xin Wang
TiO 2 @SiO 2 composite microspheres (TS) were prepared by the deposition of TiO 2 on the raspberry-like SiO 2 @polystyrene microspheres (PSS). The hollow microspheres with hierarchical microtopography possess both improved photocatalytic activity and stabilized TiO 2 particle structure. The results of energy dispersion spectrum (EDS) mapping, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) showed that after calcination, anatase TiO 2 nanoparticles has formed on the raspberry-like PSS template with preferred deposition among interstitials of the drupelet-like structure. The thermal degradation of the polystyrene (PS) core during calcination led to the hollow microspheres. The photocatalytic experiments indicated that the raspberry-like TiO 2 @SiO 2 composite microspheres (TS1-TS3) had higher photocatalytic efficiency than the smooth ones (TS0), due to the hierarchical and hollow structure. The sample TS2 prepared with a moderate ammonia concentration (3 %) not only had relatively more intact hollow spherical structure, but also enhanced photocatalytic activity. The hollow TiO 2 @SiO 2 composite microspheres (TS3) prepared with 4 % ammonia showed the best photocatalytic efficiency. However, the higher ammonia concentration made the drupelet-like structure unstable and the microspheres tend to disintegrate. The raspberry-like microstructure showed a protective effect on the loaded TiO 2 , which resulted in better recyclability with persistent photocatalytic activity. The hierarchical composite microspheres shed light on the potential effective utilization strategy of nano-photocatalyst.
研究领域:
材料科学
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化学
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纳米技术
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Bioactive Materials
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2024
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IF 18
Shunlai Shang,Kaiting Zhuang,Jianwen Chen,Ming Zhang,Shimin Jiang,Wenge Li
Mesenchymal stem cell derived exosomes (MSC-Exos) demonstrate beneficial effects on wound healing via anti-inflammatory and angiogenic properties. Chitosan (CS) exhibits excellent biocompatibility and accelerates cellular migration, adhesion, and proliferation. The ions released from bioactive glass (BG) and titanium dioxide (TiO 2 ) nanoparticles exhibit sustained angiogenic and antibacterial potency. In this study, CMCS-CEBT hydrogel was synthesized from exosomes encapsulated carboxymethyl chitosan (CMCS), chitosan nanoparticles (CS-NPs), BG, and TiO 2 nanoparticles for a preliminary evaluation of its impacts on the treatment of full-thickness skin defects, diabetic wounds, and burn skin injury due to burns. In vitro analysis indicated that the hydrogel exhibits excellent cell compatibility, stimulates endothelial cell adhesion and proliferation, and presents anti-inflammatory, angiogenic, and antibacterial activities. In vivo, the composite hydrogel dressing accelerated a wound healing acceleration effect, stimulated angiogenesis, and increased collagen deposition and the expression of anti-inflammatory factors. This innovative composite hydrogel dressing as a potential clinical therapy, utilizing bioactive materials , holds promise as a potential clinical therapy that aims to facilitate the regeneration of acute and chronically damaged skin tissue.
研究领域:
生物医学工程
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组织工程
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伤口愈合
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纳米技术
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）