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Air samples were collected weekly at an urban site and a suburban site in Guangzhou City, China, from April 2005 to March 2006, to measure the concentrations of polycyclic aromatic hydrocarbons (PAHs) in the ambient air and study their seasonal variations, gas/particle partitioning, origins and sources. The concentrations of summation Sigma16-PAHs(More)
Well-defined hexagonal hourglass-like ZnO microstructures have been synthesized by using simultaneous ultrasound and microwave irradiation methods with the assistance of ultraviolet as well as double sonication (at 25 and 40 kHz). The structure and morphology of as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy and(More)
The removal of hexavalent chromium [Cr(VI)] from aqueous solution by using red mud activated with cetyltrimethylammonium bromide (CTAB) was studied. The optimum operation parameters, such as CTAB concentration, pH values, contact time, and initial Cr(VI) concentration, were investigated. The best concentration of CTAB for modifying red mud was found to be(More)
A new ruthenium-based complex 1 [(bis(4,4'-dimethylphosphonic-2,2'-bipyridine) dithiocyanato ruthenium (II))] was developed as a colorimetric probe for the detection of Hg(II) and Cys (Cysteine). The obtained compound 1 can give interconversional color changes upon the alternating addition of Hg(II) and Cys in 100% aqueous solution. The specific(More)
Technology of direct hot melt, concentration and crystallization to manufacture hydrazine hydrate solid waste into Na<sub>2</sub>CO<sub>3</sub>&#x00B7;H<sub>2</sub>O and Na<sub>2</sub>CO<sub>3</sub> was researched, and principle of process was discussed. Effects of available chlorine dosage, pH value on hydrazine removal rate and crystallization(More)
This study was conducted to evaluate the immune impact of mimic endoscopic retrograde appendicitis therapy and appendectomy on rabbits of acute suppurative appendicitis and to determine whether TLR4/MYD88/NF-κB signaling pathway was activated in this process. 48 rabbits were assigned into 4 groups: group I, the mimic endoscopic retrograde appendicitis(More)
CdSe and CdSe/TiO(2) nanoparticles were synthesized under multibubble sonoluminescence (MBSL) condition. The influences of TiO(2) introduced as the sensitizer on the morphology and crystal transformation were investigated. The morphology, phase and optical properties of the final products have been characterized by X-ray powder diffraction, transmission(More)
A spectrofluorimetric method was established for the quantitative determination of 3-glycidoxypropyltrimethoxysilane (GPTMS), based on the quantitative reaction between dihydroxyl of hydrated epoxy groups and potassium periodate generating formaldehyde and the reaction of the formaldehyde with acetylacetone in the presence of ammonium ions generating a new(More)
High-quality single-crystalline Bi2S3 nanobelts were synthesized with Bi(NO3)3 x 5H2O and thioacetamide (TAA) as the raw materials in the polyvinylpyrrolidone (PVP) aqueous solution via a facile hydrothermal route. The morphology and crystallinity of the nanobelts were characterized by X-ray powder diffraction (XRD), field emission scanning electron(More)
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