Study On Zr_x Si_1-xO₂-RNH₃⁺Cl^- Self-assembled Membrane Formed On Phosphorylated Zr_xSi_1-xO₂/Al₂O₃ For Water Cleaning And Desalination

Traditional polymer membrane shows limitations such as poor hydrophilicity,low anti-fouling and anti-compaction properties,high membrane costs,lacking selective adsorption and non-recyclable character etc,restricting its broader applications.In order to research and develop a membrane technology with high water yield,attractive separation performance,high porosity,lower cost,selective adsorption and recyclable character,self-assembled technology was further studied in this paper.On the basis of phosphorylated Zr_xSi_1-xO₂/Al₂O₃,Zr_xSi_1-xO₂-RNH₃⁺Cl^-functional material was synthesized,then Zr_xSi_1-xO₂-RNH₃⁺Cl^-self-assembled membrane formed on phosphorylated Zr_x Si_1-x-x O₂/Al₂O₃ was formed via fluid regulation and induction of hydrogen bonds,which shows cleaning and partial desalination properties.The optimum formation conditions of the self-assembled membrane as well as the performance in oily seawater treatment were then studied.In this paper,Zr_xSi_1-xO₂-RNH₃⁺Cl^-functional material was synthesized via co-hydrolysis,silanization and amination,and phosphorylated Zr_x Si_1-x-x O₂/Al₂O₃ with various particle size was obtained through the controlled aging time during the sol-gel process.The materials synthesized under the optimum conditions were used to SEM,FT-IR and XRD characterization,results show that Zr_xSi_1-xO₂-RNH₃⁺Cl^-owns good sphericity with particle size of 1.5-2.0?m.Phosphorylated Zr_xSi_1-xO₂/Al₂O₃ with various particle size?0.5-0.6,1.5-2.0 and 5-5.5?m?exhibits rough surface and good sphericity.The diatomite support layer was firstly formed on porous support,then phosphorylated Zr_xSi_1-xO₂/Al₂O₃ and Zr_x Si_1-x-x O₂-RNH₃⁺Cl^-functional layers were successively formed via layer by layer assembly,finally the Zr_xSi_1-x-x O₂-RNH₃⁺Cl^-self-assembled membrane formed on phosphorylated Zr_xSi_1-xO₂/Al₂O₃ with deep cleaning and partial desalination properties was formed.This paper has studied the optimum formation conditions of the self-assembled membrane,including operating pressure,flow rate,fluid flow pattern and flow field distribution etc.The effect of particle size of Zr_xSi_1-xO₂/Al₂O₃ on membrane porosity and mean pore size was also investigated.Then the self-assembled membrane formed under the optimum condition was used to deep cleaning and partial desalination of oily seawater,and the influence of particle size on permeate water quality were studied and analyzed.The membrane recycling performance was also investigated.Results show that the self-assembled membrane was uniformly formed,and the membrane thickness is 3.03 mm,porosity is 65.0%and mean pore size is 98.4 nm.Particle size of Zr_xSi_1-xO₂/Al₂O₃ impacts membrane porosity and mean pore size,and then further affects permeate water quality when treating oily seawater.The self-assembled membrane can not only deep clean oily seawater,but also perform partial desalination property,thus the permeate water satisfies reuse,discharge and the inlet requirements of reverse osmosis membrane,lowering energy consumption of reverse osmosis process.The energy consumption reduces from 537.23 W to 470.08 W?saving 12.5%?.Moreover,the self-assembled membrane can be recycled by calcination,and still performs cleaning property of oily seawater.Therefore,the self-assembled membrane is expected to achieve broad applications and provide strong technical supports for the development of membrane technology.