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黄铁矿还原钛白废产物制备多孔纳米磁性吸附剂
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摘要
硫酸法生产钛白粉工业副产物硫酸亚铁不但制约钛白粉工业发展,而且大量的堆放,污染环境。为了缓减钛白副产物对环境的污染,使其中的有用成分得到合理的利用,采用黄铁矿在氮气保护下还原钛白废渣,制备多孔纳米磁性吸附材料。实验表明,黄铁矿与钛白废渣硫酸亚铁分别在120℃干燥8h,然后粉磨到200目(筛余小于5%),按照1:6.5的比例混合均匀,放置在氮气的保护的多气氛回转炉内,在600℃温度下反应40 min,自然冷却到室温,用去离子水和无水乙醇分别洗涤三次,在80℃真空干燥箱干燥6 h,得到多孔纳米磁性吸附材料。用XRD、SEM和BET对合成的多孔纳米磁性吸附材料进行表征,XRD图线与磁铁矿JCPDS(19-0629)标准卡片完全吻合(Fig.1),SEM图像显示合成的磁性纳米吸附材料平均粒径在80~100 nm(Fig.2),BET分析表明:纳米磁性吸附材料的表面积为11.1 m~2/g,孔容为0.30 cm~3/g。实验研究表明合成的纳米磁性吸附材料对水中砷、铬等重金属离子具有吸附能力。
Abtract: To reduce environmental pollution and increase resource utilization of titanium residue, Porous magnetic nano absorbent was synthesised by reductive technology under N2 protection. Firstly, pyrite and titanium residue were dried at 120 °C for 8 h, then ground to 200 mesh. Secondly, 6.5 g of titanium residue and l.0 g of pyrite were mixed well and calcined at 600 °C for 40 min, and cooled down to room temperature naturally. Finally, the magnetic nanoabsorbent were washed with DI water and absolute ethanol three times, respectively, and dried under vacuum oven at 80°C for 6 h. The prepared magnetic nanoabsorbent were studied by XRD, SEM, BET. XRD was in good agreement with JCPDS for the standard magnetite,SEM images showed primary particles with an average diameter of 80-100 nm. BET surface area and pore volume were 11.1 m~2/g and 0.30 cm~3/g, respectively.
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