Synthesis Of Porous Inorganic-Organic Nanocomposite And Investigation Of Its Application As Adsorbent

Porous materials, such as SBA-15, MCM-41, Activated Carbon, have been widely used in adsorption field because of its extensive surface area, micro/mesoporous structure, high adsorption capacity, and high degree of surface reactivity. Nowadys, many reports have paid more attentions on the modification of these porous materials for adsorption instead of the preparation of porous materials. Herein, we prepared surface modifid Macroporous Silica and polymer functionalized activated carbon, then investigated them use as adsorbents. The main contents of our work are summarized as follows:1. Macroporous silica materials were surface modified by a grafting method using amine functional groups. The obtained materials still held a high surface area of 444 m².g^-1 and a larger pore size of 22 nm after the pore surface was functionalized with (3-Aminopropyl)Triethoxysilane (APTES). The adsorption properties were investigated by Cu²⁺ removal from aqueous solutions. The resultant materials demonstrated an improved adsorption capacity, which is almost three times as high as that of amine modified conventional mesoporous silica SBA-15.2. Magnetic Fe3O4-Activated Carbon Nanocomposite Particles was synthesized from rice husk based activated carbon materials for the first time. It was interesting to find the obtained composite still held a relatively large pore diameter of 3.1 nm, high surface area of 770 m².g^-1 with 23 wt% Fe₃O₄ coated, and a saturation magnetization (Ms) of 2.78 emu.g^-1. The system demonstrated perfect magnetic separation performance and a high adsorption capacity of 321 mg.g^-1 for Methylene Blue (MB) from aqueous solution.3. Polymethyl methacrylate functionalized activated carbon was synthesized based on husk rice activated carbon with polymer formed in situ inside the pores. The composite material still held a relatively large pore diameter of 3.4 nm and surface area of 87.7 m².g^-1 even with 28 wt% of PMMA in the resultant material. The results indicated PMMA formed the hydrogen bond with the surface of activated carbon, instead physical mixture. Furthermore, we used this novel composite material to adsorb phenol from aqueous solution at 298 K and studied adsorption properties and mechanism.4. Poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) functionalization of rice husk based activated carbon was conducted and its application in removal of copper ions were investigated. The obtained composite still held a relatively large pore diameter of 3.8 nm, high surface area of 789 m².g^-1 with 12 wt% PDMAEMA coated, which is significant for activated carbon's use as adsorbent. The ability of the composite material for removing Cu²⁺ from its aqueous solution was studied by batch experiments. The adsorption data obeyed the Langmuir isotherms, which reveled that 1 g of the prepared material could adsorb 31.46 mg of Cu²⁺ from its aqueous solution. The novel PDMAEMA-activated carbon is expected to be used as an efficient adsorbent for heavy metal ions and dyes in water.5. Polystyrene coated mesoporous silica materials were synthesized in order to improve adsorption performance. Rice husk carbon was prepared under vacuum. The results showed this carbon materials held a large pore size and have a better adsorption capacity.