3D Graphene Encapsulate La₂O₃ Nanoparticles For Phosphate Removal

Graphene oxide is a kind of perfect novel carbon material.Because of its high specific surface area and abundant functional groups,graphene oxide has become a hot research topic.A series of 3D materials were developed by garphene oxide and metal oxide,the specific surface area of graphene oxide was further amplified,and metal ions facilitated to enhance conductivity,thus a kind of excellent electrode material was achieved.However,garphene encapsulate La2O3 nanoparticles were never tested for the application in removing the contaminants in water samples.In this work,a new kind of 3D grapheme material was developed by using graphene oxide and 3-(Trimethoxysilyl)-1-propanamine modified La2O3 nanoparticles under hydrothermal treatment at 180℃ for 12 hours,then the material was characterized by SEM,FT-IR,XRD,the obtained nanomaterial has larger surface area and more La2O3 nanoparticles are attached to the grapheme oxide surface.The ability of the obtained nanoparticles for phosphate removal was investigated thoroughly.Phosphate concentration below than 35 mg g-1 can be removed with 5 min,and 142 mg g-1 phosphate solution can be removed within 25 min.Adsorption process fits the Langmuir adsorption model and pseudo-second order kinetic model,the calculated maximum adsorption capacity is 82.6 mg g"1,which is in consistent with the experimental values.The interfering ions were also investigated,it indicated that common levels of Cl-,NO3-,SO42-and other interfering ions concentration in water sample have no impact on the adsorption performance for phosphate removal.The ability of the new 3D graphene encapsulate La2O3 nanoparticles for purifying phosphate contained water sample was investigated,it indicated that the new 3D material enables the removal of phosphates in water samples efficiently and quickly.