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Ren H.,University of Jinan | Ren H.,Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials | Wang J.,China Steel Corporation
Advanced Materials Research | Year: 2011

A technical condition for the reaction of preparing superabsorbent is investigated. The results indicates that reaction temperature is 30 °, reaction time is 2 h, the ratio of monomer and starch (RMS) is 5.5, pH of solution is 6.1, the ratio of initiator and starch (RIS) is 0.01 and crosslinker concentration is 0.0013 g. The maximum of distilled water absorbency is 387 times, the maximum of 0.9% saline water absorbency is 45 times. Analysis from FTIR and SEM showed that starch grafting with acrylic acid was success, and a three-dimensional network structure was formed in superabsorbent. © (2011) Trans Tech Publications. Source


Feng Y.,University of Jinan | Ren H.,University of Jinan | Ren H.,Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials | Wang J.,China Steel Corporation
Advanced Materials Research | Year: 2011

A technical condition for the reaction of preparing superabsorbent by orthogonal test was investigated. Test results were as follows: reaction temperature was 30°C, reaction time was 2 h, monomer ratio is 0.045, monomer was 12 g, neutralization degree was 90%, initiator concentration was 0.167 wt% and crosslinker concentration was 0.0125 wt%. The maximum of distilled water absorbency was 699 times, the maximum of 0.9% saline water absorbency was 70 times. Analysis from FTIR and SEM showed that starch grafting with acrylic acid and acrylamide was successful, while a three-dimensional network structure was formed in superabsorbent. © (2011) Trans Tech Publications, Switzerland. Source


Zhao P.,University of Jinan | Yan M.,University of Jinan | Zhang C.,University of Jinan | Peng R.,University of Jinan | And 3 more authors.
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2011

A novel chemiluminescence (CL) sensor for the determination of glyphosate (GLY) was made up based on molecularly imprinted polymer (MIP). The molecularly imprinted microspheres (MIMs) with a small dimension which possess extremely high surface-to-volume ratio were synthesized using precipitation polymerization with GLY as template. And then the MIMs were modified on glass sheets, which were placed at the bottom of wells of microplate as the recognizer. Subsequently, a highly selective and high throughput chemiluminescence (CL)-molecular imprinting (MI) sensor for detection of GLY was achieved. Influencing factors were investigated and optimized in detail. The method can perform 96 independent measurements sequentially in 10 min and the limit of detection (LOD) for GLY was 0.046 μg mL -1. The relative standard deviation (RSD) for 11 parallel measurements of GLY was 4.68%. The results show that CL-MI sensor can become a useful analytical technology for quick molecular recognition. © 2011 Elsevier B.V. All rights reserved. Source


Xu A.-H.,University of Jinan | Xu A.-H.,Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials | Zhang X.-X.,University of Jinan | Zhang X.-X.,Tianjin Polytechnic University | And 3 more authors.
Acta Polymerica Sinica | Year: 2015

A free-standing calcium alginate ( CA ) hydrogel filtration membrane was prepared using polyethylene glycol ( PEG ) as the pore-forming agent. The surface morphology of the filtration membrane was studied through SEM and digital photos. The relationships between flux and compression ratio mechanical behavior of the filtration membranes were studied. The effects of the concentrations of sodium alginate ( SA ) and polyethylene glycol on the pure water flux ( PWF ) and filtration properties of lysozyme ( Lyz ) solutions were investigated. Results showed that CA filtration membrane prepared using a low SA concentration and a high PEG concentration had a high flux and compression rate. The PWF increased with increase in the pressure initially and then reached a stable value. The fluxes of Lyz and bovine serum albumin ( BSA ) solutions were 89.97% and 94.6% of the PWF respectively indicating that the CA filtration membrane exhibited good anti-fouling properties. The filtration performance of the membranes was also evaluated using an oil-water emulsion and the flux was 93.04% of the PWF with a rejection rate of 99.85% . The rejection of CA filtration membranes prepared with PEG of different molecular weight was characterized by rejecting solutions of PEG with different molecular weight. The results showed that the rejection of PEG with the molecular weight bigger than that of the pore ?forming agent reached above 90%. Dyes rejection studies conducted that the free-standing membrane prepared with low molecular weight of PEG can achieve the rejection rate of brilliant blue G250 as high as 99.75% and can be used as a nano-filtration membrane. Source


Fan Y.,University of Jinan | Fan Y.,Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials
Materials Letters | Year: 2011

In this study, aluminum nitride (h-AlN) nanotubes with high crystallinity and yield have been prepared by AlP and NaN3 in a stainless steel autoclave at 350 °C. The samples were studied by powder X-ray diffraction pattern (XRD), transmission electron microscopy (TEM) and HRTEM in detail. The lengths of the AlN nanotubes are about 1 μm with most of the tube ends are open. The AlN nanotube preferentially grow along the [001] direction. The results demonstrate that the bending and roll-up of a thin layer to form tubular nanoscrolls is a thermally driven process. One-dimensional preferential growth was explained in terms of the crystallographic feature of hexagonal AlN. © 2011 Elsevier B.V. All rights reserved. Source

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