SENSORS AND ACTUATORS B-CHEMICAL
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2011
·
IF 3.37
Wei Lu,Mengyu Zhang,Keyuan Liu,Bin Fan,Zheng Xia,Liming Jiang
A simple and efficient chemosensor 1 was synthesized by reacting thiosemicarbazide with 1-naphthaldehyde. It was found that the sensor is highly selective toward fluoride anions in both UV–vis and fluorescence channels in DMSO solution. Especially, the spectral responses of the sensor along with a visible color change can be switched back and forth by successively adding F − and HSO 4 − anions into the DMSO solution, which may be represented by a complementary “IMPLICATION/INHIBIT” logic gate at molecular level employing both the ions as the chemical inputs. Based on such a reversible and reproducible sensing system, we designed a molecular-scale sequential memory unit displaying “Writing-Reading-Erasing-Reading” and “Multi-write” functions in the form of binary logic.
研究领域:
分析化学
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超分子化学
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化学生物学
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分子工程
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生物传感器
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DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2017
·Vol. 35
·期 2
·203-208
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IF 1.852
Hongxia Qin,Yingying Bian,Yaxi Zhang,Longfei Liu,Zhenfeng Bian
In this paper, the process of photocatalytic reduction of hexavalent chromium was investigated over Ti 3+ -modified TiO 2 photocatalysts. The Ti 3+ surface defects were repaired by annealing as-prepared sample at different temperatures to control the amount of Ti 3+ sites. The samples were characterized by SEM, XRD, BET, UV–vis absorption, EPR and XPS. The results showed Ti 3+ defects were successfully doped in TiO 2 . The surface selective adsorption of hexavalent chromium [Cr 2 O 7 2 − (Cr(VI))] and the desorption of trivalent chromium [Cr 3+ (Cr(III))] were investigated during the process of photocatalytic reduction. Zeta potential results presented that the increased positive charges due to more Ti 3+ defects on the surface show a significant improvement for adsorption of Cr(VI). Accordingly, the surface positive charges controlled by the Ti 3+ defects play important roles in the photocatalytic reduction of Cr(VI).
研究领域:
环境化学
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材料科学
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光催化
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表面科学
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环境污染治理
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
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IF 6.97
Wenming Xu,Xianghui An,Qinggang Zhang,Zhen Li,Qinhua Zhang,Zheng Yao,Xiaokai Wang,Sha Wang,Jingtang Zheng,Jing Zhang,Wenting Wu,Mingbo Wu
Carbon nitride (CN) is considered to be one of the most promising materials for solar photocatalytic hydrogen evolution. However, its low crystallinity degree, to some extent, limited its photocatalytic activity. Unlike previous reports, we developed a feasible method to improve the crystallinity of carbon nitride using unmelted CsCl as mild chemical scissors to trim pristine carbon nitride instead of its precursor or the intermediates with incomplete structure. As a result, the regular poly(heptazine imides) structures with higher π conjugation were exposed to the surface, wherein the bonded Cs+ ions on the surface of carbon nitride changed the charge distribution. The high regular structure can wipe out the defect sites, reducing recombined sites of electron and hole, and poly(heptazine imides) structure can greatly reserve the visible light absorption ability from pristine carbon nitride. Benefiting from these excellent features, the resultant product exhibits excellent photocatalytic hydrogen evolution activity, which is about 23 times higher than that of bulk carbon nitride.
研究领域:
材料化学
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光催化
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能源材料
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无机合成
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半导体物理
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太阳能转化
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纳米催化
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DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2015
·Vol. 72
·期 12
·2122-2131
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IF 1.106
Xu MengMeng,Zhao YaLei,Yan QiShe
Bi 7 O 9 I 3 , a kind of visible-light-responsive photocatalyst, with hierarchical micro/nano-architecture was successfully synthesized by oil-bath heating method, with ethylene glycol as solvent, and applied to degrade sulfonamide antibiotics. The as-prepared product was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflection spectra and scanning electron microscopy (SEM). XRD and XPS tests confirmed that the product was indeed Bi 7 O 9 I 3 . The result of SEM observation shows that the as-synthesized Bi 7 O 9 I 3 consists of a large number of micro-sheets with parallel rectangle structure. The optical test exhibited strong photoabsorption in visible light irradiation, with 617 nm of absorption edges. Moreover, the difference in the photocatalytic efficiency of as-prepared Bi 7 O 9 I 3 at different seasons of a whole year was investigated in this study. The chemical oxygen demand removal efficiency and concentration of NO 3 − and SO 4 2– of solution after reaction were also researched to confirm whether degradation of the pollutant was complete; the results indicated a high mineralization capacity of Bi 7 O 9 I 3 . The as-synthesized Bi 7 O 9 I 3 exhibits an excellent oxidizing capacity of sulfadiazine sodium and favorable stability during the photocatalytic reaction.
研究领域:
环境化学
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光催化
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材料科学
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环境污染治理
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药物降解
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2012
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IF 2.105
Shishun Qi,Ruzhong Zuo,Yi Liu,Yu Wang
Niobium oxide (Nb 2 O 5 ) nanofibers have been synthesized by sol–gel based electrospinning technique. Pure hexagonal phase (H-Nb 2 O 5 ) and orthorhombic phase (O-Nb 2 O 5 ) nanofibers were obtained by thermally annealing the electrospun Nb 2 O 5 /polyvinylpyrrolidone composite fibers in air at 500 °C and 700 °C, respectively. The fibers were characterized using the X-ray diffraction, scanning electron microscopy, specific surface area analyzer and UV–vis diffuse reflectance spectroscopy. Photocatalytic activities of the obtained nanofibers were evaluated depending on the degradation of methyl orange. The results indicate that the heat-treatment temperature, the crystalline structure and the morphology affected the physical and chemical properties of the as-prepared Nb 2 O 5 nanofibers. The H-Nb 2 O 5 nanofibers obtained at lower temperature showed better potential for the application as a promising photocatalyst.
研究领域:
材料科学
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纳米技术
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光催化
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无机功能材料
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Jinze Lyu,Junxian Gao,Min Zhang,Qiang Fu,Luna Sun,Shuang Hu,Junbo Zhong,Shuo Wang,Ji Li
The separation and injection of photogenerated charge carriers significantly affect the mineralization efficiency of volatile organic compounds (VOCs). These two processes can be optimized by enhancing the separation of charge carriers and the adsorption of VOCs via material engineering. However, obtaining both high adsorption ability and photoactivity of VOCs simultaneously at the ppm level is difficult. In this work, we grew microporous TiO 2 onto the surface of anatase TiO 2 to construct a homojunction-adsorption layer, enhancing both the adsorption and photodegradation of low concentration of toluene, which was chosen as model VOC. N 2 adsorption/desorption, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), GC-flame ionization detection, and surface photovoltage spectroscopy (SPS) were employed to analyze the physical properties and mineralization of toluene. Results showed that growth of microporous TiO 2 increased the surface area of the catalyst by 160% compared with anatase TiO 2 , as well as induced microporous structure. This phenomenon significantly enhanced the adsorption of toluene at a low concentration of 5.5 mg/m 3 and limited the release of the adsorbed organic compounds. Moreover, SPS and XPS results proved that a homojunction was constructed at the interface of microporous TiO 2 and anatase TiO 2 , greatly improving the separation of photogenerated charge carriers. Owing to the enhanced adsorption ability and photoactivity, the mineralization efficiency of toluene over micropore-anatase TiO 2 composite was 1.78 and 2.12 times higher than that over M-TiO 2 and anatase TiO 2 , respectively.
研究领域:
材料科学
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环境催化
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光催化
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纳米材料
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大气污染控制
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DOI
高影响因子
ANALYST
·
2014
·Vol. 139
·期 14
·3614-3621
·
IF 3.906
Zhuomin Zhang,Cheng Zhao,Yunjian Ma,Gongke Li
Toxic formaldehyde is sometimes used illegally as a food preservative, however, on-site rapid analysis of trace formaldehyde in aquatic products remains a challenge. In this work, a simple on-site rapid quantification method for trace volatile formaldehyde in aquatic products was developed by a derivative reaction-based surface enhanced Raman spectroscopy (SERS) technique coupled with a homemade portable purge-sampling device. Trace formaldehyde separated from complicated aquatic matrices via a purge-sampling procedure was reacted with a derivative reagent to produce a Raman-active analyte for consequent SERS analysis. Au/SiO2 nanoparticles (NPs) were employed as the enhancement substrate to achieve significant enhancement of Raman signal intensity. Conditions of derivative reaction and SERS detection were optimized in detail, and the selectivity of this analytical method was also evaluated based on related analogs. Under optimal conditions, an extremely low detection limit of 0.17 μg L−1 was achieved. Trace volatile formaldehyde can be found in fresh squid and shrimp samples without obvious matrix interference, and this was quantified to be 0.13–0.21 mg kg−1 using the described method. The recoveries of spiked aquatic product samples were found to be 70.0–89.1% with RSDs of 2.3–7.2% (n = 3). The results suggest that the proposed method is reliable and suitable for on-site rapid analysis of trace formaldehyde in aquatic products.
研究领域:
分析化学
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食品安全
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光谱学
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环境毒理学
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食品质量控制
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DOI
高影响因子
BMC Ophthalmology
·
2023
·Vol. 23
·期 1
·1-24
·
IF 2
Zhang Zengrui,Mu Jingyu,Wei Jing,Geng Haoming,Liu Chunmeng,Yi Wenhua,Sun Yue,Duan Junguo
Background Refractive errors are one of the most common ocular conditions among children and adolescents, with myopia showing an increasing prevalence and early onset in this population. Recent studies have identified a correlation between refractive errors and ocular biometric parameters. Methods A systematic search was conducted in electronic databases including PubMed, EMBASE, Cochrane Library, Web of Science, and Medline from January 1, 2012, to May 1, 2023. Various ocular biometric parameters were summarized under different refractive states, including axial length (AL), central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), corneal curvature (CC), Corneal curvature radius (CR),axial length-to-corneal radius ratio (AL/CR ratio), choroidal thickness (ChT), retinal thickness (RT), retinal nerve fiber layer thickness (RNFL), and retinal blood density (VD). The differences in these parameters among different refractive states were analyzed using Stata software with fixed or random-effects models, taking into account the assessed heterogeneity level. Results This meta-analysis included a total of 69 studies involving 128,178 eyes, including 48,795 emmetropic eyes, 60,691 myopic eyes, 13,983 hyperopic eyes, 2,040 low myopic eyes, 1,201 moderate myopic eyes, and 1,468 high myopic eyes. The results of our study demonstrated that, compared to the control group (emmetropic group), the myopic group and low, moderate, and high myopic groups showed significant increases in AL, AL/CR ratio, and ACD, while the hyperopic group exhibited significant decreases. Compared to the control group, the myopic group had a significantly increase for CC, while CR, CCT, perifoveal RT, subfoveal ChT, foveal ChT, parafoveal ChT, perifoveal (except nasal) ChT, and pRNFL (except temporal) significantly decreased. Compared to the control group, the hyperopic group had a significantly increase for subfoveal ChT, foveal ChT, parafoveal ChT, perifoveal ChT, and nasal pRNFL. Compared to the control group, the low and moderate myopic groups had a significantly decreases for the CCT, parafoveal RT (except nasal), perifoveal RT (except nasal), and pRNFL (except superior and temporal). Compared to the control group, the high myopic group had a significantly increase for CR, while LT, perifoveal ChT (except nasal), parafoveal RT, perifoveal RT, and pRNFL (except temporal) had significant decreased. Conclusion The changes of ocular biometric parameters in children and adolescents are closely related to refractive errors. Ocular biometric parameters devices, as effective non-invasive techniques, provide objective biological markers for monitoring refractive errors such as myopia.
研究领域:
眼科
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视觉科学
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流行病学
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生物医学工程
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儿科
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DOI
高影响因子
DALTON TRANSACTIONS
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2017
·Vol. 46
·期 47
·16525-16531
·
IF 4.029
Fu-hua Wei,Ding Chen,Zhao Liang,Shuai-qi Zhao,Yun Luo
Fe-Based metal–organic frameworks (Fe-MOFs) were prepared with trimesic acid and FeSO4·7H2O via a microwave-assisted ball milling approach. The structure and thermal stability of the as-prepared Fe-MOFs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FTIR), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). When used to degrade 20 mg L−1 hexavalent chromium in aqueous solution, the Fe-MOFs were found to completely reduce a 100 mL solution within 120 min under natural light and a 400 mL solution within 90 min under Xe lamp irradiation. Under natural sunlight, 98% of the Cr(VI) was removed from a 40 mL solution after 40 min.
研究领域:
环境化学
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材料科学
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纳米技术
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污染控制
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光催化
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水处理
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DOI
高影响因子
Polymer Chemistry
·
2021
·Vol. 12
·期 16
·2447-2456
·
IF 5.582
Wei Wen,Aihua Chen
The self-assembly of amphiphilic single chain Janus nanoparticles (SCJNPs) is a novel and promising approach for fabricating assemblies with diversified morphologies. However, experimental research into the self-assembly behavior of SCJNPs is still limited. Furthermore, it is desirable to broaden the functionality of assemblies of SCJNPs. Herein, we constructed photoresponsive liquid crystalline (LC) SCJNPs through the intrachain photo-cross-linking of azobenzene-containing amphiphilic linear block copolymer precursors of poly(poly(ethylene glycol)methyl ether methacrylate)-b-poly(11-(4-((4-butylphenyl)diazenyl)phenoxy)undecyl methacrylate-co-11-(4-(4-butylstyryl)phenoxy)undecyl methacrylate). The self-assembly behavior of these LC-SCJNPs in solution was investigated via controlling the block copolymer (BCP) composition and initial concentration. Under the effect of the LC driving force, non-spherical assemblies, including lamellae and tubes, were obtained. Additionally, the photoinduced morphological transformations of assemblies with various azobenzene contents were studied via irradiation with alternative UV/vis light irradiation. Owing to the azobenzene moieties tethered within the SCJNP building blocks via intrachain cross-linking, reversible photoinduced morphology transitions of tubes-connected spheres-tubes and spherical vesicles-spheres-spherical vesicles were observed for assemblies with a higher azobenzene content. This work broadens the functionality and self-assembly systems of SCJNPs, providing a novel view of the photoinduced morphological transitions of assemblies from SCJNPs.
研究领域:
高分子化学
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纳米材料科学
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软物质物理
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光响应材料
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自组装
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功能高分子
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DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2016
·Vol. 34
·期 12
·1329-1334
·
IF 1.872
Keli Zhong,Jie Zhao,Xue Zhou,Shuhua Hou,Yanjiang Bian,Jianrong Li,Lijun Tang
A new (8-hydroxyquinolin-2-yl)methylene picolinohydrazide derivative ( L ) has been successfully synthesized and characterized. The probe L displays high selectivity to Co 2+ in CH 3 CN/HEPES (1:1, Ｖ / Ｖ , 10 mmol·L −1 , pH=7.4) with a fluorescence "ON-OFF" response. The Co 2+ ion recognition event possesses some distinct features including rapid response, high selectivity and sensitivity, good anti-interference ability and being applicable within a wide pH range. Based on job's plot and ESI-MS studies, the 1:1 binding mode was proposed. The binding constant of L and Co 2+ is 1.63×10 8 L·mol −1 and the detection limit is 1.15 µmol·L −1 . Natural water samples experiments revealed that probe L can be potentially applied to the detection of Co 2+ in real environment.
研究领域:
分析化学
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生物无机化学
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分子探针
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环境监测
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荧光传感
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DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Deqiang Feng,Jie He,Lingcheng Zheng,Wenjun Jiang,Ce Zhang,Long Li,Jian Song,Wei Yao
Developing novel catalysts and catalysis processes are highly attractive in environmental protection and energy utilization. Photocatalysis-Fenton combinational process is an environmentally friendly technology and has broad application prospects. In this work, thin Fe@α-Fe 2 O 3 nanosheets with thickness of 2–5 nm were designed by oxidation of Fe metal nanostructure synthesized using a modified solution reaction method. The nanosheet structure with thin thickness has short diffusion distance for the photogenerated carriers and prolongs the carriers' life. Simultaneously, the presence of Fe can reduce the resistance of system and further promote the transport and transfer of photogenerated carriers from the bulk to the surface, causing less carrier recombination and better photocatalytic performance. What's more, the Fe@α-Fe 2 O 3 composite can induce the Fenton-like reaction to generate active • OH radicals, which significantly improve the degradation rate . The synergistic effect of photocatalysis and Fenton processes makes the system show an enhanced photodegradation performance: 96.5% of RhB is degraded after 60 min visible light irradiation , especially, 84.3% of RhB is degraded within the first 10 min, which are much higher than that of the pure α-Fe 2 O 3 sample. This work demonstrates that the conjunction of photocatalysis and Fenton processes based on the Fe@α-Fe 2 O 3 nanosheets provides a potential application for pollutants degradation.
研究领域:
环境化学
·
材料科学
·
催化化学
·
纳米科技
·
物理化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）