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当前位置: 首页 > 文章 > SBA-15在饱和石英砂介质中的运移及其对Cd(Ⅱ)迁移的影响 西北农业学报 2017 (8) 1259-1266
Position: Home > Articles > SBA-15 Transport and its Effect on Cd(Ⅱ)Mobility in Saturated Sand Media Acta Agriculturae Boreali-occidentalis Sinica 2017 (8) 1259-1266

SBA-15在饱和石英砂介质中的运移及其对Cd(Ⅱ)迁移的影响

作  者：
郭瞻宇;郭堤;蒋亚辉;秦睿;张增强;李荣华
单  位：
西北农林科技大学资源环境学院
关键词：
Cd(Ⅱ);SBA-15;纳米颗粒;多孔介质;迁移
摘  要：
为了解SBA-15纳米颗粒在饱和石英砂介质中的运移及其对Cd(Ⅱ)迁移的影响。采用恒定流速柱迁移试验法,探讨Cd(Ⅱ)、SBA-15及Cd(Ⅱ)和SBA-15共存条件下的穿透曲线。结果表明,平衡对流-弥散方程能描述多孔介质中Cd(Ⅱ)和SBA-15迁移过程的穿透曲线。在石英砂多孔介质中,Cd(Ⅱ)的迁移能力强于SBA-15,Cd(Ⅱ)和SBA-15的出流比C/C0峰值分别为0.99和0.58。Cd(Ⅱ)和SBA-15共存时,随着Cd(Ⅱ)质量浓度从0mg/L增加到10 mg/L,SBA-15的迁移阻滞因子(R)和不可逆吸附系数(μ)分别增大1.43倍和4.78倍,此时,SBA-15的Zeta电位从-55.7mV增加至+16.3mV,导致SBA-15在石英砂颗粒表面上的沉积滞留增加,进而同时抑制SBA-15和Cd(Ⅱ)的迁移。研究表明,SBA-15在多孔介质中的迁移过程易受团聚、滞留和沉积作用的影响,同时Cd(Ⅱ)和SBA-15在多孔介质中的迁移过程伴随有固相界面的分配过程。
译  名：
SBA-15 Transport and its Effect on Cd(Ⅱ)Mobility in Saturated Sand Media
作  者：
GUO Zhanyu;GUO Di;JIANG Yahui;QIN Rui;ZHANG Zengqiang;LI Ronghua;College of Natural Resources and Environment,Northwest A&F University;
关键词：
Cd(Ⅱ);;SBA-15;;Nanoparticles;;Porous media;;Transportation
摘  要：
This work aimed to evaluate the silicate nanoparticles(SBA-15)transport and its effect on Cd(Ⅱ)mobility in saturated porous sand media.The column experiment with constant flow rate was conducted to explore the breakthrough curves and deposition prafiles of Cd(Ⅱ),SBA-15 and Cd(Ⅱ)coexisting with SBA-15 and in porous media,while balanced convection-diffusion equation could be used to describe the breakthrough curves of Cd(Ⅱ)and SBA-15 transport.The results showed that mobility of Cd(Ⅱ)was higher than that of SBA-15 in sand porous media with the peak C/C0 of Cd(Ⅱ)and SBA-15 effluents were 0.99 and 0.58 respectively.The presence of Cd(Ⅱ)might be inhibit the SBA-15 migration.With the increased Cd(Ⅱ)concentration from 0to 10mg/L,the retardation factor R and the irreversible rentention coefficientμof SBA-15 effluent increased 1.43 and 4.78 times,respectively.In addition,the zeta potential of SBA-15 increased from-55.7 mV to +16.3mV,which results more SBA-15 retained in the sand surface and leads to the Cd(Ⅱ)and SBA-15 transport inhibited in the porous media.Therefore,our findings proved that the agglomeration,retention and deposition effects could be significantly influence the transport of SBA-15 nanoparticles in the porous media and changed the solid surface Cd(Ⅱ)distribution.

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