Preparation Of Magnetic Acrylic Functionalized Resin And Its Application In Water Treatment

Our drinking water pollution is serious, NOMs (natural organic matters) is one of the important pollutants, which not only increases the water color, affect the sensory effect of the water body, but also an important precursor of disinfection by-products, increase the health and safety hazard of drinking water disinfection process. The water NOMs has the characteristics of negatively charged and wide molecular weight distribution. Compared with the conventional activated carbon adsorption, ion exchange technology for NOMs is more effective, and more widely used in the treatment of drinking water.This study successfully prepared by suspension polymerization of acrylic magnetic strongly basic anion exchange resin (m-PGMA). And the effect of m-PGMA on the NOMs, which was represented by dissolved humic acid, was investigated. By comparing before and after modification quaternary ammonium resin to remove the molecular weight and solubility of hydrophobic and hydrophilic characteristics of humus, we evaluated the contribution of the resin substrate adsorption process, and the impact on m-PGMA resin regeneration effect.The main conclusions are as follows:;m-PGMA resin with glycidyl methacrylate (GMA) monomer, oleic acid modified Fe3O4 magnetic core.Resin is spherical, the water rate is 70.3%,degree of crosslinking is 1%, the ion exchange capacity for 2.01mEq/g; particle size distribution of 80-100μm, specific surface area 25.53m2/g,, average pore diameter of 2.75nm. The resin is core shell structure, Fe3O4 is located inside the resin, and the resin can be quickly and efficiently separated under the applied magnetic field.The size of the resin can be effectively controlled by changing the rotating speed. When the rotational speed is reduced to 510r/min and 420r/min, the particle size distribution of 210-250μm and 290-330μm is obtained.The removal of soluble humic acid by m-PGMA resin has the advantages of high speed and high efficiency. The dynamic process can use quasi two level dynamic model fitting.The smaller the particle size, the faster the adsorption rate of dissolved humic acid.Through the Boyd model, it can be known that the adsorption process is dominated by liquid film diffusion.Resin to remove dissolved humic thermodynamic equilibrium can Freundlich isotherm equation fitting.The modified resin before the dissolved humic acid removal mainly through hydrophobic interaction, interaction between benzene and other physical adsorption.The modified m-PGMA resin can function and physical function of humic acid removal by ion exchange.By comparing the quaternary ammonium modification of resins before and after removal of dissolved humic acid molecular weight and hydrophilic features found unmodified resin for small molecular weight (<10 KDa)component removal efficiency is slightly better than high molecular weight (> 100 KDa) component, and the hydrophobic component removal is far superior to a hydrophilic component;the modified resin for removal performance of each component of humic acid significantly improved,especially the large molecular weight component and the hydrophilic component.Adsorbed on the resin substrate by large hydrophobic group cannot be regenerated by 10% NaCl, so the performance is first the regeneration of resin regeneration efficiency decreased significantly (decreased 6%), after regeneration efficiency decline rate steady at around 1%.