LaNi0.95Fe0.05O3磁性粒子的制备及其对水中甲基橙的吸附动力学  

Preparation of magnetic LaNi_(0.95)Fe_(0.05)O_(3) particles and its adsorption kinetics for methyl orange in water

作　　者：陈蕾 余传明 CHEN Lei;YU Chuanming(Zhanjiang College of Science and Technology,Zhanjiang 524094,China;Faculty of Chemistry and Environmental Science,Guangdong Ocean University,Zhanjiang 524088,China)

机构地区：[1]湛江科技学院,广东湛江524094 [2]广东海洋大学化学与环境学院,广东湛江524088

出　　处：《印染助剂》2022年第6期35-40,共6页Textile Auxiliaries

基　　金：广东省普通高校青年创新人才项目(2017KQNCX093);湛江市科技计划项目(2018A01042)。

摘　　要：通过柠檬酸凝胶法制备一系列LaNi_(1-x)Fe_(x)O_(3)粒子,通过XRD、SEM、FT-IR、XPS对其结构进行表征;测试粒子对水中甲基橙的吸附行为,其中LaNi_(0.95)Fe_(0.05)O_(3)粒子的平均粒径为458.7 nm,比表面积为14.15 m^(2)/g,Zeta电位为24.8 mV,对水中甲基橙的吸附效果最优,最高吸附量及去除率分别为0.940 mg/g和91.85%;当吸附温度为25~70℃,甲基橙初始质量浓度为10 mg/L时,LaNi_(0.95)Fe_(0.05)O_(3)粒子对甲基橙的吸附量随着温度的升高而降低,吸附等温线符合Langmuir模型(R^(2)大于0.99),属于自发吸热的单分子物理吸附;吸附过程符合准二级速率方程,受液膜扩散和内扩散2个过程的影响。利用磁铁可以实现吸附剂与水体的快速分离与回收,从而实现印染废水的高效净化,且回收的吸附剂可以实现多次重复利用,是一种理想的印染废水吸附剂。A series of LaNi_(1-x)Fe_(x)O_(3)particles were prepared via citric acid gel method,and was character⁃ized by XRD,SEM,FT-IR,and XPS.The adsorption behavior of the nanoparticles for methyl orange in water was explored.The LaNi_(0.95)Fe_(0.05)O_(3)particle with average particle size of 458.7 nm,specific surface area of 14.15 m^(2)/g,and Zeta potential of 24.8 mV,showed the highest adsorption capacity and removal rate for methyl or⁃ange of 0.940 mg/g and 91.85%,respectively.When the temperature was 25~70℃,and the initial concentra⁃tion of methyl orange was 10 mg/L,the adsorption quantity of LaNi_(0.95)Fe_(0.05)O_(3)nanoparticle decreased with the rise of temperature.The adsorption equilibrium could be described by the Langmuir isotherm(R^(2)>0.99).It was suggested that the adsorption process was endothermic process and belonging to physical adsorption.The ad⁃sorption process conforms to the quasi second-order rate equation and was affected by liquid film diffusion and internal diffusion.The use of magnets could realize the rapid separation and recovery of adsorbent and water,thereby realizing efficient purification of printing and dyeing wastewater,and the recovered adsorbent could be reused many times.As a result,it showed great potential in the application of the treatment for dye⁃ing wastewater.

关 键 词：镧镍铁氧体 磁性 吸附 甲基橙 动力学 

分 类 号：X703[环境科学与工程—环境工程]