Preparation and photocatalytic properties of a visible light responsive and magnetically separated photocatalyst of γ-Fe 2 O 3 /SiO 2 /GSs/TiO 2

Micro & nano letters

article

Deqiang Chen¹  Yiqun Chen¹  Yang Li¹  Shaonan Ye¹ 

[1] Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University

关键词: catalysis;    photochemistry;    catalysts;    iron compounds;    silicon compounds;    titanium compounds;    graphene;    sol-gel processing;    magnetic particles;    crystal microstructure;    X-ray diffraction;    transmission electron microscopy;    nanoparticles;    nanocomposites;    nanomagnetics;    nanofabrication;    red shift;    superparamagnetism;    visible spectra;    dyes;    visible light responsive magnetically separated photocatalyst preparation;    graphene sheet synthesis;    natural graphite powder;    titanium dioxide;    sol-gel method;    recycling;    catalyst waste;    morphological property;    microstructure;    absorption spectrum;    magnetic property;    X-ray diffraction;    transmission electron microscopy;    diffuse-reflectance spectra;    vibrating sample magnetometer;    nanocrystalline structure;    P25 nanoparticles;    redshift;    absorption edge;    superparamagnetism;    visible light photocatalytic activity;    methylene blue decomposition;    photocatalysts;    Fe2O3-SiO2-C-TiO2;   

DOI  :  10.1049/mnl.2014.0673

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Background: The stress response to laryngoscopy and endotracheal intubation is a commonly encountered physiological phenomenon. Though the response can be transient and harmless in normotensive healthy patients, but it may prove hazardous amongst patient with underlying cardiac disease, or hypertensive disease and its sequelae. Present study was planned to evaluate the efficacy of IV dexmedetomidine infusion and IV lignocaine in attenuating the hemodynamic responses during laryngoscopy and intubation. Methodology: On approval from hospital ethical committee, 120 ASA grade I and II, normotensive patients in the age group of 18-60 years, planned for elective surgery under general anesthesia were enrolled in the study. Patients were divided into 3 equal groups of 40 each; Group A (Lignocaine group) received lignocaine 1.5 mg/kg IV 2 min before induction, Group B (dexmedetomidine group ) received dexmedetomidine 1 µ/kg IV infusion with syringe pump 10 min before induction, and Group C (control group) received normal saline before induction. Heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), oxygen saturation of arterial blood (SpO2) and electrocardiogram (ECG) were monitored at induction, intubation and post intubation at one minute interval till 10th minute. Results: A better control of stress response was observed in patients receiving dexmedetomidine infusion. More decrease in HR was noted in Group B as compared to Group A (9.28 % vs. 13.40%) respectively. The decrease in MAP was also more in Group B as compared to group receiving lignocaine (5.49 % vs. 10.72%) respectively. Conclusion: Dexmedetomidine 1 μg/kg IV is more effective in blunting stress response to laryngoscopy and endotracheal intubation as compared to lignocaine 1.5 mg/kg IV.

【 授权许可】

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