改性甘蔗渣去除模拟废水中孔雀石绿的研究

Removal of Malachite Green in Simulated Wastewater by Modified Bagasse

选用甘蔗渣作为原料,通过微波法合成Fe_3O_4磁改性甘蔗渣(MB),用柠檬酸进行化学改性,制备出能够快速、简便分离且吸附效果好的生物质吸附剂,用于去除模拟废水中的孔雀石绿(MG)。对比了甘蔗渣改性前后对孔雀石绿的去除效果;采用SEM和FTIR对甘蔗渣改性前后的结构和组分进行了表征;通过吸附动力学试验以及平衡试验探究吸附机理;测试了温度、pH以及吸附剂投加量对吸附结果的影响。结果表明:改性甘蔗渣吸附孔雀石绿的过程符合二阶动力学模型和Langmuir模型;对于50 m L初始浓度为20 mg/L的孔雀石绿溶液,在pH为7.5、温度为50℃时,只需添加15 mg的吸附剂便能达到98%的去除率,吸附量为140.20 mg/g,较未改性的甘蔗渣提高了将近1倍。

Using sugarcane bagasse as raw material,the microwave method was applied for the synthesis of Fe_3O_4 magnetically modified bagasse. Then a chemical modification was followed by the use of citric acid,and finally a kind of biomass adsorbent which could be quickly and easily separated and had good adsorption effect was prepared for removal of malachite green in simulation wastewater. The removal effect of malachite green between bagasse before and after modification was compared,and the structure and components of the two kinds of materials were characterized by SEM and FTI. The adsorption mechanism was explored applying adsorption kinetics experiment and equilibrium experiment,and the influence of the temperature,p H and adsorbent dosage on the adsorption tested. The result shows that the adsorption process conforms to the Pseudo-second order kinetic model and the Langmuir model. For 50 m L malachite green solution with the initial concentration of 20 mg/L,under the p H of7. 5 and the temperature of 50 ℃,the removal rate of 98% could be reached by adding 15 mg of sorbent. The adsorption amount was 140. 20 mg/g,nearly double of that by bagasse with no modification.