添加剂对水热法制备超细氧化铁的影响  

The effect of additives on ultra-fine ferric oxide prepared by a hydrothermal method

作　　者：郑雅杰[1] 符丽纯[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《功能材料》2007年第A06期2072-2075,共4页Journal of Functional Materials

摘　　要：以硫铁矿烧渣酸浸液为原料，采用水热法制备超细氧化铁。添加剂对水热产物的物相影响较小，但对水热产物形貌影响较大。当水热反应温度为190℃、反应时间为30min、总铁浓度为3mol／L、n（Fe^2＋）/n（Fe^3＋）取0．145时，加入添加剂CTAB、NaH2PO4、CO（NH2）2水热反应所得产物为椭球形粒子；加入PVP、OP所得水热产物为球形氧化铁粒子，但其粒径差异较大。酸浸液中n（Fe^2＋）／n（Fe^3＋）物质量之比对水热产物物相和形貌有重要影响。当n（Fe^2＋）/n（Fe^3＋）为0时，水热产物为大小均匀的球形超细Fe2O3粒子，其粒径约为0.11μm；当n（Fe^2＋）／n（Fe^3＋）为0．145时，其水热产物颗粒增大、粒径各异，物相为Fe2O3、Fe3O4；当n（Fe^2＋）/n（Fe^3＋）为0.842时，从放大3万倍SEM照片，难以观测其形貌与粒径大小，其物相为Fe3O4。Ultra-fine oxide ferric was prepared from leaching solution of pyrite cinders by a hydrothermal method. Additives have little effect on the phases but greatly on the morphology of the products.When the reaction temperature is 190℃, the reaction time is 0.5h, pH value is 7.0, total iron concentration is 3mol/L and n（Fe^2＋）/n（Fe^3＋）（molar ratio） is 0.145, ellipsoidal particles were made by adding the additives of CTAB, NaH2PO4 and CO（NH2）2,; Spherical particles were prepared by adding the additives of PVP and OP, but the particle sizes were different. Molar ratio （n（Fe^2＋）/n（Fe^3＋）） in the leaching solution has a important influence on the morphology, particle size and phases of hydrothermal products. When n（Fe^2＋）/n（Fe^3＋） is 0, iron oxide is sphere particles of Fe2O3, which size is even 0.1μm. When n（Fe^2＋）/n（Fe^3＋） is 0.145, the size of the products increases, the phases are Fe2O3 and Fe3O4. when n（Fe^2＋）/n（Fe^3＋） is 0.842, the particle of products is very fine, even SEM （30000n） don＇t detect the morphology of the products, and the phase is only Fe3O4.

关 键 词：硫铁矿烧渣 硫酸 水热法 添加剂 氧化铁 

分 类 号：X705[环境科学与工程—环境工程]