Bioactive Materials
·
2020
·
IF 8.724
Yawei Ren,Yajing Han,Zhaoyang Li,Xiangmei Liu,Shengli Zhu,Yanqin Liang,Kelvin Wai Kwok Yeung,Shuilin Wu
Bacterial infection and related diseases are threatening the health of human beings. Photocatalytic disinfection as a simple and low-cost disinfection strategy is attracting more and more attention. In this work, TiO 2 nanoparticles (NPs) were modified by co-doping of Ce and Er using the sol–gel method, which endowed TiO 2 NPs with enhanced visible light photocatalytic performance but not pure ultraviolet photocatalytic properties compared the untreated TiO 2 . Our results disclosed that as the doping content of Er increased, the photocatalytic activity of modified TiO 2 NPs initially increased and subsequently decreased. The same trend occurred for Ce doping. When the doping dose of Er and Ce is 0.5 mol% and 0.2 mol%, the 0.5Ce0.2Ti–O calcined at 800 °C presented the best antibacterial properties, with the antibacterial efficiency of 91.23% and 92.8% for Staphylococcus aureus and Escherichia coli , respectively. The existence of Er ions is thought to successfully turn the near-infrared radiation into visible region, which is easier to be absorbed by TiO 2 NPs. Meanwhile, the addition of Ce ions can effectively extend spectral response range and inhibit the recombination of electrons and holes, enhancing the photocatalytic disinfection activity of co-doped TiO 2 .
研究领域:
材料科学
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微生物学
·
光催化技术
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产品关联
DOI
PubMed
高影响因子
ACS Agricultural Science & Technology
·
2024
·
IF 2.3
Li Man,Huayao Chen,Xiang Liao,Jinhao Zhao,Hongjun Zhou,Li Hao,Xinhua Zhou
The low utilization rate of pesticide leads to the pollution of soil and environment, which ultimately endangers human health. In this study, TiO2 nanoparticles were synthesized and loaded with fluopyram (Flu) on halloysite (Ha) via sol–gel methods which was named Flu@THa. Thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were used to characterize the structure of all samples, and then the performances of zeta potential, fungistatic ability, antileaching behavior, and biosafety were tested. The results showed that anatase-phase TiO2 was synthesized on halloysite with a particle size of ∼10 nm. Under neutral conditions (pH 7), the cumulative rate of pesticide release from Flu@THa was three times higher than that under acidic and alkaline conditions in 24 h. Flu@THa was evenly distributed in the soil and slowed the loss of pesticides. In addition, Flu@THa can promote germination and growth of peanut seeds and had good biocompatibility with low toxicity to zebrafish. This study is expected to be able to provide implications for environmentally friendly nanopesticides.
研究领域:
环境科学
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农业科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yongjun Sun,Yuanyuan Yu,Deng Li,Jun Zhai,Huaili Zheng
A hybrid flocculant, PAC-CA, with the advantages of inorganic and organic flocculants, was prepared, and the coagulation behavior and floc characteristics of PAC-CA for removing titanium dioxide nanoparticles (TiO 2 -NPs) under different conditions were studied. The effects of monomer mass ratio, initiator concentration, hydroxyl aluminum ratio, reaction temperature, and polymerization time on the coagulation performance for TiO 2 -NP removal were studied. PAC-CA was characterized through SEM, FT-IR, TG-DSC, XRD, XPS, and Ferron complex colorimetric characterization. The characterization results showed that PAC-CA was successfully copolymerized using AlCl 3 , carboxymethyl chitosan, and acrylamide. The high content of Alb in PAC-CA helped improve the coagulation performance. When the dosage was 30 mg/L, the pH was 8, the stirring intensity was 200 s −1 , and the settling time was 30 min, the optimal removal rates for TiO 2 -NPs and turbidity were 87.30% and 91.72%, respectively. Kaolin could effectively improve the TiO 2 -NP removal efficiency and promote the density and particle size of flocs. Humic acid exerted an inhibitory effect on coagulation efficiency with loose and small flocs.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 6
·e4351
·
IF 3.581
Qingqing Lu,Wenhui Peng,Suhang Xun,Minqiang He,Ruliang Ma,Wei Jiang,Wenshuai Zhu,Huaming Li
The aggregation of nanoparticle catalysts is one of the main problems in catalytic reactions. In this study, a series of TiO 2 nanoparticle catalysts with various dispersions were prepared and applied in the catalytic oxidation of dibenzothiophene (DBT) systems. Compositions and structures of the as-prepared samples were analyzed by means of wide-angle X-ray diffraction, Raman and X-ray photoelectron spectroscopies. The dispersions of TiO 2 nanoparticles were controlled by calcining at various temperatures and verified using transmission electron microscopy. It was found that the activities of TiO 2 nanoparticles in the catalytic oxidation of DBT were positively correlated with the dispersions. TiO 2 nanoparticles calcined at 500 °C (500-TiO 2 ) showed the best catalytic activity and the oxidation of DBT reached 99.8% under mild conditions. Based on the results of GC–MS analysis, radical trapping experiments and electron spin resonance spectra, • O 2 − radicals were proved to be the main active species in the oxidation process, and a mechanism is proposed. Meanwhile, the recycling performance of 500-TiO 2 was investigated, and no obvious decrease was observed after six recycles.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Bin Zhang,Xu He,Xiaohan Ma,Qinghua Chen,Guocheng Liu,Yuanming Zhou,Dong Ma,Chunyue Cui,Jun Ma,Yanjun Xin
To improve the redox performance and light absorption property, the 2D/0D g-C 3 N 4 /TiO 2 heterojunction photocatalyst were successfully fabricated by co-annealing process based on melamine powder and ultrafine TiO 2 nanoparticles (about 9.87 nm) obtained from electrochemical etching technology. The surface micromorphology, crystal structure, basic element composition, chemical structure, specific surface and optical performance were analyzed by SEM-EDS, TEM, HR-TEM, XRD, XPS, FTIR and Ultraviolet–visible diffuse reflection spectra (UV–vis DRS). The photocatalytic performance of g-C 3 N 4 /TiO 2 photocatalyst was assessed by the degradation of tetracycline hydrochloride (TC) under simulated sunlight irradiation. The results showed that the obtained TiO 2 powder had extremely smaller particle size and higher photocatalytic activity than commercial P25. The coupling of 0D TiO 2 nanoparticles and 2D g-C 3 N 4 nanosheet further promoted the visible light absorption performance of TiO 2 . The unique g-C 3 N 4 /TiO 2 heterojunction photocatalyst exhibited remarkable photocatalytic performance for the degradation of TC, whose degradation rate could reach to 99.40% under 120 min irradiation. The kinetic constant of the g-C 3 N 4 /TiO 2 photocatalyst was 1.48 times of that of TiO 2 . The ESR results confirmed ·OH and ·O 2 – radicals produced in the photocatalytic process. This work could provide an effective reference for the fabrication of ultrafine TiO 2 powder and binary heterojunction photocatalyst with excellent photocatalytic activity for organic pollutants degradation in water purification.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Frontiers in Chemistry
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2022
·
IF 5.545
Zhao Jun,Deng Nengmei
The thermal decomposition performance of an oxidizer directly determines the thrust and specific impulse properties of the solid propellant. Hexagonal boron nitride (h-BN) has the characteristics of high catalytic activity and good stability, which can improve the heat release and decomposition temperature of the oxidant, and then improve the energy performance of the propellant. In this study, a novel hybrid material TiO2 NPs/h-BN was successfully prepared by in situ growth, and it was found that when 5 wt.% TiO2 NPs/h-BN was added, the initial decomposition temperature of ammonium perchlorate (AP) decreased by 67.6°C. Due to the addition of TiO2, the gap between the h-BN layers as well as the specific surface increased, which optimized its thermocatalytic performance, and it also proposed a catalytic mechanism for the thermal decomposition process of AP.
研究领域:
材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Ying Liu,Xiaoya Liu,Xinying Liu,Yajing Li,Jinghuan Ma,Cong Ma
As one of the key factors that affect the application of hydrazine hydrate as a potential hydrogen source, efficient and cheap catalyst is particularly important. Nickel based catalysts have been widely studied because of their excellent catalytic performance for the decomposition of hydrazine hydrate to hydrogen. Herein, a Ni catalyst supported on anatase TiO 2 through reduction and impregnation methods was prepared. Structure of the catalyst was investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and X-ray photoelectron spectroscopy (XPS). The effects of the amount of TiO 2 and the concentration of NaOH on the activity of the catalyst were investigated. The results showed that the catalyst prepared with a metal nickel content of 0.2 mmol using 100 mg of the nano-TiO 2 support had the best catalytic performance. Hydrazine hydrate could be completely decomposed at 343 K in 2.83 min, the hydrogen selectivity attained 100%, and the turnover frequency (TOF) value was 265.49 h −1 . In this catalyst, transition metal Ni was dispersed on the support surface in the form of amorphous elemental or oxide. Anatase TiO 2 support had the advantages of promoting the dispersion of metal Ni, exposing the active site, changing the electronic state of the active center, strengthening the strong metal-support interaction (SMSI), and improving the activity of the catalyst. After ten cycles of use, the performance of the catalyst stabilized and the hydrogen selectivity was still as high as 100%.
研究领域:
材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Chenjuan Xiao,Yukun Yan,Guodong Wen,Yangtao Zhou,Duo Na,Chengling Yang,Jinsong Zhang
This work developed a simple and mild strategy for controllable synthesis of highly and homogeneously distributed TiO 2 nanoparticles on a cellulose template via tuning the cellulose crystallinity. As the crystallinity of cellulose increases, the restriction from crystallinity on nanoparticles increases, leading to homogeneous distribution, a decrease in size, and structural changes of TiO 2 from crystalline to amorphous. The carboxyl groups grafted on the periodically arranged hydroxyl groups of crystalline cellulose, which act as anchor sites for metal oxide precursor, restrict the distribution, growth and crystallization of TiO 2 nanoparticles. The amorphous TiO 2 nanoparticles on the cellulose with the highest degree of crystallinity (72.40 %) give the highest adsorption capacity toward tetracycline hydrochloride (152.89 mg/g), which is the state of art among the supported TiO 2 . The high adsorption capacity is proposed to be the oxygen defects caused by the Ti 3+ species, originating from the amorphous TiO 2 nanoparticles.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
ACS ES&T Water
·
2023
·
IF 5.3
Yinshan Xie,Lilantian Cheng,Fei Liu,Jian Li
Advanced nanofiltration (NF) processes have been extensively utilized to handle wastewater generated in the dyeing industry. However, NF membranes inevitably incur fouling issues during their operation procedure. Herein, TiO2 nanoparticles were employed as an additive in the aqueous phase in an interfacial polymerization (IP) process to fabricate the thin-film nanocomposite (TFN) NF membrane. With the introduction of TiO2 nanoparticles, a rougher and more hydrophilic membrane surface was obtained. The optimal TFN membrane with 1.5% TiO2 decoration exhibited a pure water permeability of up to 14.32 L m–2 h–1 bar–1, which was 1.88 times higher than that of the pristine thin-film composite membrane. Moreover, the obtained NF membrane maintained high rejections toward dye molecules (99.7% for Congo red, 99.5% for reactive blue 19, 99.7% for xylene brilliant cyanin G, and 99.1% for methyl blue), considerable salt rejections (44.5% for NaCl, 91.2% for Na2SO4, 54.1% for MgCl2, and 82.8% for MgSO4), and satisfactory stability during the 72 h long-term operation. The exceptional self-cleaning ability of resultant TFN membranes under UV irradiation offered an inspired method for establishing photocatalytic self-cleaning membrane to treat wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Dongban Duan,Hui Liu,Yang Xu,Yuxiang Han,Mengxin Xu,Zhengchu Zhang,Zhibo Liu
The classical photodynamic therapy (PDT) requires external light to activate photosensitizers for cancer treatment. However, limited tissue penetration of light has been a long-standing challenge for PDT to cure malignant tumors in deep tissues. Recently, Cerenkov radiation (CR) emitted by radiotracers such as 18F-fluorodeoxyglucose (18F-FDG) has become an alternative and promising internal light source. Nevertheless, fluorine-18 (F-18) only releases 1.3 photons per decay in average; consequently, injection dose of F-18 goes beyond 10–30 times more than usual to acquire therapeutic efficacy because of its low Cerenkov productivity. Gallium-68 (Ga-68) is a favorable CR source owing to its ready availability from generator and 30-time higher Cerenkov productivity. Herein, we report, for the first time, the use of Ga-68 as a CR source to activate dextran-modified TiO2 nanoparticles (D-TiO2 NPs) for CR-induced PDT. Compared with 18F-FDG, 68Ga-labeled bovine serum albumin (68Ga-BSA) inhibited the growth of 4T1 cells and exhibited significantly stronger DNA damage to tumor cells. In vivo studies showed that the tumor growth was almost completely inhibited when tumor-bearing mice were treated with a combination of D-TiO2 NPs and 68Ga-BSA. This study proved that Ga-68 is a more potent radionuclide for PDT than F-18 both in vitro and in vivo offered a promising strategy of using a diagnostic dose of radioactivity to achieve depth-independent cancer therapy without using any external light source.
研究领域:
放射医学
·
纳米医学
·
肿瘤学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2015
·
IF 3.65
Song Shen,Lin Wu,Jiejie Liu,Meng Xie,Haijun Shen,Xueyong Qi,Yongmin Yan,Yanru Ge,Yi Jin
To facilitate targeting drug delivery and combined therapy, we develop titanium dioxide-encapsulated Fe 3 O 4 nanoparticles (Fe 3 O 4 @TiO 2 NPs). Titanium dioxide (TiO 2 ), which is employed as a sonosensitizer for sonodynamic therapy (SDT), can also be used for the loading of doxorubicin (DOX). The fabricated Fe 3 O 4 @TiO 2 NPs exhibit pH-dependent loading and release of doxorubicin (DOX) in vitro. After incubation with cancer cells, reactive oxygen species (ROS) are generated efficiently upon the irradiation of ultrasound. In the biodistribution experiments, extremely high in vivo tumor accumulation of Fe 3 O 4 @TiO 2 NPs and long-time retention effect are observed. Compared with chemotherapy or sonodynamic treatment alone, the combined therapy demonstrated a synergistic effect, resulting in stronger cytotoxicity and higher therapeutic efficacy. Thus, the constructed NPs are endowed with multifunctions which allow them to selectively deliver combinatorial therapeutic payload to tumor with enhanced therapeutic effectiveness and minimal side effects.
研究领域:
肿瘤学
·
纳米医学
·
药剂学
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 42
·16183-16192
·
IF 7.367
Lei Sun,Zhenglin Li,Zhuo Li,Ying Hu,Chong Chen,Chenhui Yang,Baosheng Du,Ye Sun,Flemming Besenbacher,Miao Yu
Photothermal agents (PTAs) with high biocompatibility and therapeutic efficacy have become particularly fascinating, however, knowledge of their photothermal performance is rather limited. Herein, rationally designed core–shell TiO2 nanoparticles have been fabricated using a mild hydrogenation method, where NaBH4 was used as the H2 source. The resultant TiO2 possesses strong optical absorption in the NIR region and remarkable photothermal conversion capability and stability, leading to a high inhibition rate on cancer cells. In particular, its photothermal conversion efficiency is as high as 55.2%, which is 204% that of the fully hydrogenated amorphous TiO2. More importantly, the underlying mechanism is proposed. It is revealed that while the oxygen vacancies induced by the hydrogenation can introduce defect levels in the band gap and enhance the optical absorption, the superfluous oxygen vacancies and defects reduce the photothermal conversion capability and thermal conductivity to a large extent. Controlling the hydrogenation degree and maintaining a certain extent of crystallization are, therefore, crucial to the photothermal properties. This new understanding of the photothermal conversion mechanism may have provided a fresh route to design and optimize PTAs and inspire considerable interest to turn a large variety of semiconductor metal oxides into competent PTAs by appropriate hydrogenation.
研究领域:
材料科学
·
生物医学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
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