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以九水合硝酸铁为原料,利用改进的聚合诱导胶体聚集(PICA)的方法制备出三维网络状多级孔结构氧化铁(HPH).此结构的制备关键是在合成过程中尿素和甲醛聚合生成脲醛树脂(UF).脲醛树脂一方面在铁的羟基氧化物生长过程中与之杂化形成杂化产物Fe-UF,另一方面则进一步聚合,形成脲醛树脂微球(UFM).脲醛树脂微球作为模板诱导杂化产物Fe-UF在其表面的聚集.微球与微球之间则由于表面存在的脲醛树脂间的聚合会相互交联形成网络状结构.经过煅烧处理后,脲醛树脂及脲醛树脂微球的分解导致不同尺寸孔结构的生成.光催化研究结果表明,产物对罗丹明B的降解效率是商用纳米氧化铁的4倍.
Three-dimensional network-like multi-pore structure iron oxide (HPH) was prepared by the improved polymerization-induced colloidal aggregation (PICA) using ferric nitrate nonahydrate as raw material.The key of preparation of this structure was the polymerization of urea and formaldehyde during the synthesis UF (urea formaldehyde resin) UF resin hybridized with Fe-UF during the growth of iron oxyhydroxide on the one hand, and formed UFM on the other. Ball as a template to induce the aggregation of the hybrid product Fe-UF on the surface of the microspheres and microspheres due to the presence of the surface between the urea-formaldehyde resin cross-linked to form a network-like structure .After calcination, urea-formaldehyde resin and The decomposition of UF resin microspheres resulted in the formation of pore structures with different sizes.The photocatalytic results showed that the degradation efficiency of rhodamine B was four times that of commercial nano-iron oxide.