市政污泥陶粒对Cd^(2+)吸附特性的影响  

Effect of Municipal Sludge Ceramsite on Cd^(2+) Adsorption Characteristics

作　　者：陈冠海 宋书巧 曾海琪 CHEN Guanhai;SONG Shuqiao;ZENG Haiqi(School of Geographic Science and Planning,Nanning Normal University,Nanning,Guangxi,530001,China;School of Environment and Life Sciences,Nanning Normal University,Nanning,Guangxi,530001,China)

机构地区：[1]南宁师范大学地理科学与规划学院,广西南宁530001 [2]南宁师范大学环境与生命科学学院,广西南宁530001

出　　处：《广西科学》2024年第3期513-522,共10页Guangxi Sciences

基　　金：广西科技重大专项(AA18118013-4)资助。

摘　　要：为拓展市政污泥资源化利用和无害化处理途径,本研究以市政污泥、黏土和膨润土为原料,采用高温烧结技术制备市政污泥陶粒,以含Cd^(2+)废水为污染物,考察市政污泥陶粒添加量、溶液初始pH值、吸附时长及Cd^(2+)初始浓度对陶粒吸附性能的影响,研究其吸附动力学与等温吸附特性,并借助X射线衍射(XRD)、扫描电子显微镜(SEM)等表征手段,揭示其吸附机理。结果表明:①烧结后,市政污泥陶粒表面粗糙、孔隙结构及官能团丰富;②石英(SiO_(2))、莫来石(Al_(6)Si_(2)O_(13))、钙长石(CaAl_(2)Si_(2)O_(8))和赤铁矿(Fe_(2)O_(3))是市政污泥陶粒的主要晶相,吸附Cd^(2+)后矿物成分不变;③在特定条件(陶粒添加量50 g、Cd^(2+)初始浓度300 mg/L、吸附时间120 min、pH值6)下,Cd^(2+)去除率高,表明陶粒具备高效吸附Cd^(2+)的能力;④市政污泥陶粒对Cd^(2+)的吸附包含物理吸附和化学吸附两种吸附方式,相较于准二级动力学模型,更符合准一级动力学模型,市政污泥陶粒对Cd^(2+)的吸附既存在单层吸附,又存在多层吸附,吸附机制较复杂。研究结果可为市政污泥的资源化利用以及对Cd^(2+)污染物的处理提供科学依据和技术支持。In order to expand the means for the resource utilization and innocent treatment of municipal sludge,this study employed high temperature sintering to prepapre municipal sludge ceramsite with municipal sludge,clay,and bentonite as raw materials.Taking the wastewater containing Cd^(2+)as a pollutant,this study examined the influences of the addition of municipal sludge ceramsite,the initial pH value of solution,the adsorption time,and the initial concentration of Cd^(2+)on the adsorption property of ceramsite.At the same time,the adsorption kinetics and isothermal adsorption characteristics were studied,and the unique adsorption mechanism was revealed by X Ray Diffraction(XRD),Scanning Electron Microscopy(SEM)and other characterization methods.The results showed that:①After sintering,the municipal sludge ceramsite presented a rough surface,a pore structure,and abundant functional groups;②Quartz(SiO_(2)),mullite(Al_(6)Si_(2)O_(13)),calcium feldspar(CaAl 2Si 2O 8),and hematite(Fe_(2)O_(3))were the main crystalline phases of municipal sludge ceramsite,and the mineral composition was unchanged after adsorption of Cd^(2+);③Under certain conditions(addition of 50 g ceramsite,the initial Cd^(2+)concentration of 300 mg/L,the adsorption time of 120 min,and pH value of 6),the removal rate of Cd^(2+)was high,indicating the high ability of ceramsite to adsorb Cd^(2+);④The municipal sludge ceramsite adsorbed Cd^(2+)in two manners:physical adsorption and chemisorption.The adsorption conformed more to the quasi first order kinetic model than to the quasi second order kinetic model.The municipal sludge ceramsite adsorbed Cd^(2+)via a complex mechanism involving both single layer and multi layer adsorption.The results can provide a scientific basis and technical support for the resource utilization of municipal sludge and the treatment of Cd^(2+)and pollutants.

关 键 词：市政污泥陶粒 含镉废水 吸附动力学 吸附等温线 吸附机理 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]