摘要
以TiO2纳米粉和NaOH为原料,调节水热温度为100、150和180℃,制备钛酸盐纳米材料并研究其对Pb(Ⅱ)的吸附特性。结果表明:150℃条件下制备的钛酸盐纳米材料吸附性能最优,对Pb(Ⅱ)的去除能力能达到90%以上;动力学吸附在40 min以后达到动态平衡,吸附过程符合准二级动力学模型;TNs-150对Pb(Ⅱ)的吸附为放热过程,温度升高,TNs-150对Pb(Ⅱ)的吸附能力逐渐减小;Langmuir吸附等温模型很好地描述钛酸盐纳米材料对Pb(Ⅱ)的吸附,属单分子层吸附,饱和吸附量为227.27 mg·g^-1;TNs-150对Pb(Ⅱ)的吸附最佳pH为6.00,解吸率可达到80%以上。
A series of titanate nanomaterials(TNs)were synthesized hydrothermally using TiO2 nano powder and NaOH at different temperatures(100,150 and 180℃).Adsorption properties of TNs in aqueous solutions were investigated.The results presented that TNs-150 showed the best adsorption capacity.Result from batch experiments also demonstrated that Pb(Ⅱ)reduced by 90%。The adsorption behavior of TNs on Pb(Ⅱ)reached equilibrium after 40 min.The pseudo-second-order equation can commendably describe the adsorption kinetics process of Pb(Ⅱ)on TNs.TNs adsorption of Pb(Ⅱ)is an exothermic process,as the temperature rises,the amount of Pb(Ⅱ)adsorption capacity on TNs was decreased.The adsorption of Pb(Ⅱ)was well described by Langmuir adsorption isotherms,belonging to monolayer sorption.Meanwhile,maximum adsorption capacity of TNs-150 was 227.27 mg·g^-1.The adsorption amount was pH-dependent,being maximum when pH was 6.00,and the desorption rate is 80%for Pb(Ⅱ).
作者
刘珂
李朝政
黄娇娇
牟洋
周爽
尤永军
Liu Ke;Li Chaozheng;Huang Jiaojiao;Mou Yang;Zhou Shuang;You Yongjun(College of Water Conservancy and Architecture Engineering,Tarim University,Alar,Xinjiang 843300,China)
出处
《广东化工》
CAS
2020年第10期4-6,21,共4页
Guangdong Chemical Industry
基金
国家级大学生创新创业训练计划项目(107572017044)。
关键词
钛酸盐纳米材料
温度
铅
吸附
Titanate nanomaterials
Temperature
Lead
Adsorption
