Method for synthesizing nanometer gama-Al2O3 by adopting solvent replacement/azeotropic distillation drying method and applications thereof

Abstract

The invention discloses a method for synthesizing nanometer gama-Al2O3 by adopting a solvent replacement / azeotropic distillation drying method. The method is characterized in that the concentration of a AlCl3 solution is 0.7mol.L<-1>, the molar concentration ratio of Al<3+> to a dispersing agent is 250:1, adding a solvent is added and then agitating is carried out, the furnace temperature is 580DEG C, low-cost AlCl3 and n-butyl alcohol replace expensive alcohol aluminum as raw materials, the hydrolysis rate of Al<3+> and the particle size are controlled through adding a surfactant, the hard agglomerate of a precursor aluminium hydroxide gel can be effectively eliminated by adopting the solvent replacement / azeotropic distillation drying method, the prepared nanometer gama-Al2O3 is high in specific area and even in particle distribution, and the particle sizes range from 30nm to 70nm. The prepared nanometer gama-Al2O3 is added in polymeric aluminium chloride and fully mixed to prepare the nanometer modified polymeric aluminium chloride. The waste water coagulating sedimentation effect of the polymeric aluminium chloride can be effectively promoted.

Description

technical field [0001] The invention relates to the technical field of chemical preparation of materials, in particular to nano-γ-Al 2 o 3 preparation method, especially a kind of synthesis nano-γ-Al by solvent replacement / azeotropic distillation and drying method 2 o 3 method and its application. Background technique [0002] With the rapid development of my country's industrial and agricultural production and the acceleration of urbanization, the production of mass production and domestic sewage has increased dramatically. In particular, due to the pursuit of economic interests and the limitation of technical conditions, a lot of sewage is directly discharged into the environment without treatment, causing more and more water bodies to be polluted and causing a series of social and environmental problems. Therefore, new high-efficiency water treatment chemicals have always been the key development of the basic industry in the technical field of water treatment and envi...

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Problems solved by technology

[0014] The technical problem to be solved by the present invention is to provide a method for synthesizing nanometer-Al 2 o 3 method and its application to inexpensive AlCl 3 and n-butanol instead of the more expensive aluminum alcohol as raw materials, and control Al by adding surfactants 3+ The hydrolysis rate and the size of the particles, this method effectively eliminates the hard agglomeration of the precursor aluminum hydroxide gel, and the prepared nano-γ-Al 2 o 3 High specific surface area, uniform particle distribution, particle size between 30nm and 70nm

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