硫酸铅基底表面性质对铁矾异相成核生长的影响  

Effects of surface properties of anglesite substrates on heterogeneous nucleation and growth of jarosite

作　　者：史美清 田园 艾忠滨 张文超 柯勇[1,2] 闵小波 王庆伟[1,2] 颜旭 SHI Meiqing;TIAN Yuan;AI Zhongbin;ZHANG Wenchao;KE Yong;MIN Xiaobo;WANG Qingwei;YAN Xu(School of Metallurgy and Environment,Central South University,Changsha 410083,China;Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution,Central South University,Changsha 410083,China;Science Environmental Protection Co.Ltd.,Changsha 410000,China)

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083 [2]中南大学国家重金属污染防治工程技术研究中心,湖南长沙410083 [3]赛恩斯环保股份有限公司,湖南长沙410000

出　　处：《中南大学学报（自然科学版）》2023年第2期456-464,共9页Journal of Central South University:Science and Technology

基　　金：湖南省高新技术产业科技创新引领计划项目(2020SK2006);国家杰出青年科学基金资助项目(51825403);湖南省科技创新计划项目创新平台与人才计划项目(2021RC3013);国家重点研发计划项目(2020YFC1909201)。

摘　　要：选用不同表面特征(粗糙度、表面亲疏水性、比表面积和暴露晶面)的硫酸铅加入铁矾结晶体系中,通过分析反应过程中溶液电导率以及沉淀物形貌、物相、铁含量等性质的变化,考察硫酸铅表面性质对铁矾异相成核的影响规律。研究结果表明:虽然硫酸铅的表面性质不同,但铁矾均会在其表面发生异相成核,而不同表面性质会显著影响铁矾的成核和生长速率;若硫酸铅表面粗糙且亲水性较强,则铁矾的异相成核速率可显著提高,这是因为该表面性质可降低铁矾异相成核的能垒;铁矾的生长速率主要受到硫酸铅表面溶解的影响,当硫酸铅比表面积较大、晶面溶解释放铁矾构晶离子(如Pb^(2+)和SO_(4)^(2-))较多时,其表面过饱和度较高,可以提高铁矾的生长速率。Three kinds of anglesite with different surface properties(roughness, surface hydrophilicity, specific surface area and exposed crystal surface) were added to the iron-containing solution during the jarosite crystallization reaction. Through the analysis of conductivity of the solution and the morphology, phase, iron content of the precipitate obtained during the reaction process, the effect of surface properties of anglesite on heterogeneous nucleation and growth of jarosite was investigated. The results show that in spite of different surface properties of anglesite, all the jarosite is heterogeneously nucleated on anglesite, and the different surface properties can significantly affect the nucleation and growth rate of jarosite. When the surface of anglesite is rough and hydrophilic, the heterogeneous nucleation rate of jarosite can be significantly increased. Because the energy barrier for heterogeneous nucleation of jarosite can be reduced. The growth rate is mainly affected by the surface dissolution of anglesite. Anglesite has large specific surface area, and the crystal surface dissolves and releases more component of jarosite crystal(such as Pb^(2+)and SO_(4)^(2-)), leading to a high local supersaturation, which can promote the growth rate of jarosite.

关 键 词：铁矾 硫酸铅 异相成核 生长速率 

分 类 号：TF09[冶金工程—冶金物理化学]