PVA/PAM/TM水凝胶的制备及其对染料和氨氮废水的吸附性能

Preparation of PVA/PAM/TM hydrogels and their adsorption properties for dyes and ammonia-nitrogen wastewater

为解决酸性品红染料和氨氮对水资源污染的问题,将绿色环保的无机矿物电气石(TM)粒子通过共混的方式加入到聚乙烯醇(PVA)/聚丙烯酰胺(PAM)水凝胶中,制备了一系列PVA/PAM/TM水凝胶,并探究了TM含量对PVA/PAM水凝胶去除染料和氨氮废水以及净化水质性能的影响。结果表明:与PVA/PAM水凝胶相比,负载TM质量分数为2.0%时,水凝胶的水接触角从60.6°降低到41.9°,拉伸强度从1.01 MPa增加到1.05 MPa,说明在PVA/PAM水凝胶中掺入电气石可以提高水凝胶的亲水性和力学性能;并且发现P-TM_(2.0%)水凝胶具有66.90%的酸性品红染料去除效率和72.91%的氨氮废水去除效率;同时,PVA/PAM/TM水凝胶中的TM与水接触时,也能改善水质,净化水体,水体的pH值和电导率分别从5.95、2.38μS/cm提升到7.04和10.03μS/cm。

In order to solve the problem of water pollution caused by acid fuchsin dye and ammonia nitrogen, green and environmentally friendly inorganic mineral tourmaline(TM) particles were added to the PVA/PAM hydrogel by blending, and a series of PVA/PAM/TM hydrogels were prepared. Besides, the effects of tourmaline content on the removal of dye and ammonia nitrogen wastewater and water purification performance of PVA/PAM hydrogels were systematically explored. The results showed that, compared with PVA/PAM hydrogel, when the mass fraction of loaded tourmaline was 2.0%, the contact angle of the PVA/PAM/TM hydrogels decreased from 60.6° to 41.9° and the tensile strength increased from 1.01 MPa to 1.50 MPa, which indicated that the mechanical properties and hydrophilicity of hydrogels were improved by blending tourmaline into PVA/PAM hydrogels. It was also found that P-TM_(2.0%) hydrogel had 66.90% removal efficiency of acid fuchsin and 72.91% removal efficiency of ammonia nitrogen wastewater. At the same time, when the tourmaline in PVA/PAM/TM hydrogel contacted with water, it could also improve the water quality and purify the water bodies. The pH value and conductivity of water bodies were increased from 5.95, 2.38 μS/cm to 7.04 and 10.03 μS/cm, respectively.