摘要
制备了13X分子筛/凹凸棒土颗粒材料,通过扫描电镜、X射线衍射等对其微观结构进行分析,考察了不同p H值、不同Pb(Ⅱ)质量浓度下13X分子筛/凹凸棒土颗粒对水中Pb(Ⅱ)的吸附行为。结果表明:13X/凹凸棒土颗粒疏松多孔,表面及内部有许多孔道;当p H值为3.5~12.2、Pb(Ⅱ)质量浓度为100 mg/L、吸附时间1 h和投加量1 g/L时,13X/凹凸棒土颗粒对Pb(Ⅱ)去除率为76.0%~99.9%;13X/凹凸棒土颗粒对水中Pb(Ⅱ)的吸附过程更符合准二级速率方程和Langmuir模型,表明13X/凹凸棒土颗粒对水中Pb(Ⅱ)是单层的、快速的化学吸附,计算出最大吸附容量为438.6 mg/g;交换出来的Na+与吸附的Pb2+摩尔浓度比接近于理论值2倍,说明13X/凹凸棒土颗粒吸附Pb(Ⅱ)的主要机理是离子交换。
A granular 13X molecular sieve/attapulgite adsorbent for Pb（Ⅱ） was synthesized, and the morphology and structure was characterized by scanning electron microscope （SEM） and powder X-ray diffraction （XRD） etc. The effect of pH and different Pb（II） content on Pb （Ⅱ） adsorption by granular 13X/attapulgite. The results showed that： granular 13X/attapulgite had large spaces and homogeneous pore canals in the interlayers and surface. When pH, mass concentration of Pb （Ⅱ）, reaction time and granular 13X/attapulgite dosage was 3.5-12.2, 100 mg/L, 1 h and 1 g/L, the removal rate of Pb （Ⅱ） was 76.0%-99.9%. The adsorption process followed the pseudo second-order model and Langmuir isotherm, which showed that Pb （Ⅱ） adsorption by granular 13X/attapulgite was onomolecular layer chemisorption, and the maximum sorption capacity of Pb （Ⅱ） was 438.6 mg/g. Additionally, the molar ratio of exchanged Na^＋ and adsorbed Pb^2＋ at equilibrium was close to the ideal value 2, indicating that the main adsorption mechanism could be explained to the ion exchange.
出处
《非金属矿》
CAS
CSCD
北大核心
2018年第2期88-91,共4页
Non-Metallic Mines
基金
国家自然科学基金(50904047)
湖北省教育厅科研计划项目(D20154402)
矿区环境污染控制与修复湖北省重点实验室开放研究基金课题(2014107)
湖北理工学院校级重点科研项目(13xjz02A)
