凹凸棒石-针铁矿改性麦秸木质陶瓷的微观结构

Microstructure of attapulgite-goethite modified woodceramics from wheat straw

以凹凸棒石、针铁矿和小麦秸秆为原料,添加少量的环氧树脂作为黏结剂,在适宜的温度和气氛下煅烧,同步完成了生物质碳化、凹凸棒石热活化及针铁矿的还原,获得了具有高气孔率和强磁性的凹凸棒石-针铁矿改性麦秸木质陶瓷,利用XRD和SEM分析了原料质量比及焙烧温度对其物相及微观结构的影响。结果表明:凹凸棒石-针铁矿改性麦秸木质陶瓷是一种非晶态多孔质碳素材料,在相同温度下,原料的质量比对其物相几乎无影响;随着焙烧温度的升高,凹凸棒石的特征衍射峰逐渐消失,凹凸棒石-针铁矿改性麦秸木质陶瓷中有新的物相产生。

Attapulgite,goethite and wheat straw were used as raw materials,and little amount of epoxy was added as adhesive.The models were sintered under proper temperature and atmosphere,then biomass carbonization,attapulgite thermal activation and goethite deoxidation were achieved simultaneously,so as to acquire attapulgite-goethite modified woodceramics from wheat straw with the property of high porosity and strong magnetism.The effects of mass ratios of raw materials and sintering temperature on the phase and microstructure of the composites were analyzed by XRD and SEM.The results show that the attapulgite-goethite modified woodceramics from wheat straw is a kind of amorphous and porous carbon material,mass ratio of raw materials has almost no influence on phases under the same temperature.With the increase of sintering temperature,characteristic diffraction peaks of attapulgite disappeare gradually,new phase appears in attapulgite-goethite modified woodceramics from wheat straw.