超声对LaCO_(3)OH改性蒙脱石除磷特性的影响研究  

Influences of ultrasound on the performance of phosphorus removal using the LaCO_(3)OH-modified montmorillonite

作　　者：曹宏凯 杨云云 罗武辉 CAO Hongkai;YANG Yunyun;LUO Wuhui(Jiangxi Key Laboratory of Mining&Metallurgy Environmental Pollution Control,Ganzhou 341000,China;School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Jiangxi Academy of Eco-Environmental Sciences and Planning,Nanchang 330039,China)

机构地区：[1]江西省矿冶环境污染控制重点实验室,江西赣州341000 [2]江西理工大学资源与环境工程学院,江西赣州341000 [3]江西省生态环境科学研究与规划院,江西南昌330039

出　　处：《工业水处理》2023年第9期100-109,共10页Industrial Water Treatment

基　　金：江西理工大学清江青年英才支持计划(JXUSTQJYX2020006);中国博士后科学基金资助项目(2018M640604);江西省研究生创新专项资金项目(YC2022-S662)。

摘　　要：在超声作用下,采用镧基纳米颗粒对蒙脱石进行改性,以除磷效率为评价指标,结合响应曲面实验设计从蒙脱石质量浓度、超声时间和超声功率三方面讨论了合成条件对改性蒙脱石除磷特性的影响。对优选的改性蒙脱石开展了包括吸附动力学、等温线、共存离子影响以及再生性等方面的系统性吸附探究。结果表明,蒙脱石质量浓度对磷去除率的影响最为显著,其次为超声功率和超声时间;当蒙脱石质量浓度为2.9 g/L、超声时间为14.239 min、超声功率为281.469 W时,制备的改性蒙脱石除磷效果最佳,磷去除率接近100%。优选的改性蒙脱石对磷酸根的吸附过程符合准二级动力学和Freundlich模型,属于多分子层的化学吸附。除高浓度SO_(4)^(2-)外,Cl^(-)、NO_(3)^(-)和HCO_(3)^(-)对改性蒙脱石除磷的影响较小,抗干扰性强。碳酸钠比氢氧化钠更适合吸附材料的再生,经0.1 mol/L的Na_(2)CO_(3)溶液再生4次后对磷的去除率仍高达98%。Assisted with the ultrasound,the lanthanum(La)-based nanoparticle was deployed to modify montmorillonite(Mt).Using the removal efficiency of phosphorus as the evaluation criteria,the response surface methodology was used to assess the influences of Mt concentration,ultrasonic power,and ultrasonic time on phosphorus removal.The optimized Mt composite(La-Mt)was further applied to investigate systematically the adsorption characteristics,including kinetics,isotherm,effect of coexisting anion,and regeneration performance.The results indicated that the Mt mass concentration was the most significant factor impacting phosphorus removal,followed by the ultrasonic power and ultrasonic time.With the condition that Mt mass concentration of 2.9 g/L,ultrasonic time of 14.239 min,and ultrasonic power of 281.469 W,the synthetic Mt composite demonstrated the best removal rate close to 100%.Adsorption of phosphorus on La-Mt was well fitted by the pseudo second-order mode and the Freundlich mode,suggesting a multilayer chemical adsorption process.Except the high concentration SO_(4)^(2-),the Cl^(-),NO_(3)^(-),and HCO_(3)^(-)showed negligible influence on phosphorus removal,indicating the favorable anti-interfering property.Compared to NaOH,Na_(2)CO_(3) was more suitable for the regeneration of the saturated La-Mt,where the removal rate of 98%was obtained even after regenerated for 4 times when 0.1 mol/L Na_(2)CO_(3) was used.

关 键 词：镧 蒙脱石 超声 改性 除磷 

分 类 号：X703.1[环境科学与工程—环境工程]