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以三聚氰胺和前躯体盐为原料,采用半封闭热解法在g-C_3N_4中引入Fe元素。结构分析表明,Fe能够通过化学键合进入g-C_3N_4的骨架结构中形成掺杂型g-C_3N_4。通过将催化剂与聚偏氯乙烯(PVDF)制成复合膜,考察了Fe引入前后g-C_3N_4在低光照强度下紫外光催化降解甲基橙的光催化活性。研究发现g-C_3N_4/PVDF复合膜具有吸附-迁移-光降解的链锁效应,其光降解率达到11.85%,优于g-C_3N_4粉体的2.5%;Fe的引入能提高光催化性能。在Fe掺杂体系中,光催化性能随Fe含量的提高呈现先增加后减小的趋势,在Fe含量为1.65%(wt,质量分数),热解温度为600℃时,降解率最高达到35.38%。
Using melamine and precursor salt as raw materials, Fe element was introduced into g-C_3N_4 by semi-closed pyrolysis method. Structural analysis shows that Fe can form doping g-C_3N_4 through chemical bonding into the framework of g-C_3N_4. The photocatalytic activity of g-C_3N_4 photocatalytic degradation of methyl orange with low light intensity before and after the introduction of Fe was investigated by the composite membrane of catalyst and polyvinylidene chloride (PVDF). It was found that the g-C 3 N 4 / PVDF composite film has a chain-lock effect of adsorption-migration-photodegradation with a photodegradation rate of 11.85%, which is better than 2.5% of g-C_3N_4 powder. The introduction of Fe can improve the photocatalytic performance. In the Fe-doped system, the photocatalytic activity first increased and then decreased with the increase of Fe content. The maximum degradation rate was 35.38 with Fe content of 1.65% (wt, mass fraction) and pyrolysis temperature of 600 ℃ %.