活性炭/树脂负载TiO_(2)光催化净化甲醛实验研究

分别采用溶胶-凝胶法和离子交换法研制了新型复合光催化材料TiO_(2)/AC和TiO_(2)/CER,并对甲醛进行紫外光催化净化实验,研究考察TiO_(2)负载情况、紫外光强度、空气湿度对室内空气中甲醛净化的影响。结果表明,活性炭对TiO_(2)的负载效果好于树脂,随着紫外光照强度和湿度的提高,TiO_(2)/AC和TiO_(2)/CER对甲醛吸附效果有所增强,但TiO_(2)/AC光催化效果明显优于TiO_(2)/CER。在相对湿度为30%、紫外照射强度18.5μW/cm 2工况下,TiO_(2)/AC对甲醛的降解率为85%,TiO_(2)/CER对甲醛的降解率为69%,高于未负载TiO_(2)时活性炭的47%,树脂的62%。湿度增加,树脂发生溶胀,TiO_(2)与甲醛分子间形成晶界壁垒而降低净化性能。该研究对新型复合光催化材料的研发及室内空气中甲醛净化技术开发具有参考价值。

SrAl2O4∶Eu,Ho/树脂应力发光薄膜在焊缝缺陷检测中的应用

采用高温固相法合成SrAl_2O_4:Eu,Ho应力发光材料。XRD结果表明,所合成的样品较纯,掺杂离子并未改变基质材料的基体结构。将SrAl_2O_4:Eu,Ho(SAOEH)应力发光粉末与树脂混合制备复合应力发光薄膜。光谱结果表明,薄膜的发光随着厚度的增加而增强;薄膜的SEM结果表明,SAOEH粉体颗粒均匀分散在树脂中。将应力发光薄膜应用于钢板焊缝处背面,应力测试结果表明薄膜应力发光先增强后减弱。当薄膜厚度为0.9 mm时,应力发光最强,且在焊缝处可得到较高的响应值。此外,在循环测试的过程中,应力发光薄膜可对焊板断裂实现实时响应,结合CCD相机可实现钢板焊缝检测的可视化,并对缺陷定位。

Kinetics of Esterification of 2-Keto-L-Gulonic Acid with Methanol Catalyzed by Cation Exchange Resin

The kinetics of esterification of 2-keto-L-gulonic acid with methanol in the liquid phase catalyzed by cation exchange resin, D001, was studied. The experiments were carried out in a stirred batch reactor at 318, 323, 328, 333, 338, 341 K under atmospheric pressure. It is found that the speed of rotating rate has no effect on the esterification rate in the range of 300-500 r/min and the effect of internal mass transfer resistance is not obvious. The effects of temperature and catalyst loading on the reaction rate were researched under the condition of eliminating the effect of diffusion. The rate was found to increase with the increase of the temperature and catalyst loading. The experimental data were correlated with a kinetic model based on the pseudo-homogeneous catalysis. The kinetic equation for describing the reaction catalyzed by cation exchange resin was developed. The experimental data are in good agreement with the model.

Removal of 5-Amino-2-chlorotoluene-4-sulfonic and Chlorhydric Acids from Wastewater by Weakly Basic Resin

This research deals with an investigation of the adsorption of two acids, namely, 5-amino- 2-chlorotoluene-4-sulfonic and chlorhydric acids from their solution onto weakly basic resin. The screening of res-ins, kinetics, and isotherm were studied. The results indicate that the D301R is more appropriate for the removal of acids from solution. The adsorption of acids obeys Langmuir isotherm and the first-order kinetics model. Sorptive affinity of the two acids on D301R was found to be in the order of 5-amino-2-chlorotoluene-4-sulfonic acid> chlorhydric acid. Thermodynamic parameters for the adsorption of acids were calculated and discussed. The maxi-mum removal of acids was observed around 97% and 76% at 25℃ for 5-amino-2-chlorotoluene-4-sulfonic acid and chlorhydric acid , respectively.

Adsorption of 2-naphthalenesulfonic acid/sulfuric acid/sulfurous acid from aqueous solution by iron-impregnated weakly basic resin：Equilibrium and model

Commercial grade weakly basic resin D301 was impregnated with iron through a simple method using ferric chloride. Experiments for single, bisolute and trinary competitive adsorption were carried out to investigate the adsorption behavior of 2-naphthalenesulfonic acid(NSA), sulfuric acid and sulfurous acid from their solution at 298 K onto the novel hybrid iron impregnated D301(Fe-D301). Adsorption affinity of NSA on Fe-D301 was found to be much higher than that of sulfuric acid, while adsorption affinity of sulfuric acid was slightly higher than that of sulfurous acid. The data of single-solute adsorption were fitted to the Langmuir model and the Freundlich adsorption model. The non-ideal competitive adsorbed model coupled with the single-solute adsorption models were used to predict the bisolute and trinary-solute competitive adsorption equilibria. The NICM coupled with the Langmuir model yields the favorable representation of the bisolute and trinary-solute competitive adsorption behavior.

Preparation and Properties of Y_(2)O_(3)-PF Alternating Coating on Polymer Matrix Composite Material Surface

High-performance yttrium oxide-phenolic resin(Y_(2)O_(3)-PF)alternating coating was prepared on epoxy resin-based composite material using supersonic plasma spraying and dual-channel powder feeding technique.Y_(2)O_(3)-coated PF(Y_(2)O_(3)/PF)powder was firstly sprayed onto the substrate,forming a transition layer,and then the spherical Y_(2)O_(3) powder and Y_(2)O_(3)/PF powder were alternately deposited to form the composite alternating coating.Results show that the alternating coating is mainly composed of deposited Y_(2)O_(3)/PF powder.The bonding strength between coating and substrate is as high as 26.48 MPa with the single-test maximum bonding strength of 28.10 MPa,and shear strength reaches 24.30 MPa.Additionally,the heat transfer effect caused by external Y_(2)O_(3) particles gradually softens and even melts PF,thus effectively avoiding the damage of high temperature to molecular structure and thereby promoting the crosslinking and curing effects of resin during the deposition process.In the meantime,the unmelted Y_(2)O_(3) powder results in the shot peening effect,which washes out and eliminates the powder particles with inferior deposition effect,ultimately improving the physical and chemical properties of the alternating coating.

EFFECT OF AMPHIPHILIC POLY (STYRENE-B-ETHYLENE OXIDE) DIBLOCK COPOLYMER INTERCALATED LAYERED SILICATE AS FILLER ON ACRYLONITRILE-BUTADIENE-STYRENE RESIN

The diblock copolymers intercalated layered silicate was prepared via a melt dispersion technique. Then the effect of intercalated hybrid as filler on acrylonitrile- butadiene-styrene resin was characterized by X-ray diffraction, transmission electron microscopy, stress-strain measurements in elongation.