Prepaation Of Hydrophobic And Oleophilic Materials And Their Properties In Oil/water Separation

Oily wastewater pollution has seriously affected the ecological balance and human health,in order to solve the problem of oil/water separation,this article adopts the method of cationic polymerization to synthesize poly(divinyl benzene)(PDVB)composite materials.The poly(divinyl benzene)synthesized in this experiment is one-dimensional nanomaterials with hollow nanotube structure,and PDVB is super-hydrophobic and super-hydrophilic,the hydrophobic angle is 133.5°.Hydrophobic and lipophilic materials have a good application prospect in the treatment of oily wastewater,but PDVB is in the form of powder,its recycling is not convenient in practical applications.Therefore,Fe3O4 nanoparticles are loaded into PDVB and PDVB is loaded onto nonwovens fibers to facilitate the recovery of PDVB nanomaterials.The experimental results show that the addition of 2.4 mL of divinylbenzene(DVB)monomer and 240 ?L of boron trifluoride ether(BFEE)initiator to 80 mL of hexane can produce PDVB with better performance and yield,Magnetic PDVB nanocomposites and nonwoven fabric supported PDVB composites can be prepared by putting 0.175 g of iron oxide nanoparticles and 0.0264 g of Octadecyltrichlorosilane(OTS)modified nonwoven fabrics into the cationic polymerization system.For the simulated oily wastewater with oil concentration of 2500 mg·L-1,the removal rate becomes 89.18%and the oil concentration decrease to 270.46 mg·L-1 after 5 min's adsorption of the magnetic PDVB nanocomposites at 30?.The adsorption capacity of the magnetic PDVB nanocomposites turns to 11.89 g·g-1,and decreases by 6.64%after being reused 10 times,which indicates the stability of the composite material is very good;For the simulated oily wastewater with oil concentration of 1500 mg·L-1,after 30 min's adsorption of non-woven fabric PDVB composites at a temperature of 30 ? for 10 min,the removal rate becames 90.2%and the oil concentration decreases to 146.94 mg·L-1,the adsorption capacity of non-woven fabric PDVB composites reaches 6.51 g·g-1,and decreases by 14.13%after being reused 10 times,which may be due to the partial desorption of the PDVB on the nonwoven fabrics during the adsorption process.The adsorption isotherm of the magnetic PDVB composite is fitted with the Langmuir empirical adsorption model,and the adsorption isotherm of non-woven fabric supported PDVB composites is fitted with Temkin empirical adsorption model.The dynamic models of PDVB nanocomposites and non-woven fabric supported PDVB composites are both fitted with quasi-second-order kinetics model and intra-particle diffusion model,R2 are both above 0.9.The composite materials can be directly applied to the oil and its by-products contaminated water,and its convenient recycle and fast adsorbent process make it has a good application prospect in the separation of oil and water.