SYNTHESIS AND CHARACTERIZATION OF A NEW COMPOUND :K_6Ti_0.67Nb_15.33O_42

A new compound K6Ti0.67Nb15.33O42 was prepared for the first time by solid state reaction in K2O-Ni2O3-Nb2O5 ternary system. The new compound was characterized by electron probe, X-ray powder diffraction and DTA. The result of X-ray powder diffraction shows that K6Ti0.67Nb15.33O42 crystallizes the hexagonal system with unit cell parameters a = 9. 1341(5) A ,c=12. 090(1)A . and space group P62/mcm(193 ).

聚(丙烯酰胺-二甲基二烯丙基氯化铵)-聚硅酸锌复合絮凝剂的制备及其絮凝性能

利用水溶液聚合法制备PDA-聚硅酸锌复合絮凝剂,并用丙烯酰胺-二甲基二烯丙基氯化铵(poly(acrylamide-dimethyldiallylammonium chloride),PDA)和复合絮凝剂分别处理刚果红模拟染料废水和高岭土模拟废水,再分别通过扫描电镜做出对比.结果表明:在处理刚果红模拟染料废水时,复合絮凝剂在p H=8时得到的效果最好,脱色率为90.4%,较单独使用PDA高9.1%;在处理高岭土模拟废水中,最佳投加量为1.8 m L.在p H=8时,复合絮凝剂的去浊率为99.5%,较单独使用PDA高16.9%.通过扫描电镜发现,复合絮凝剂较二者未复合前,其比表面积更大,有利于对废水的絮凝.