摘要 通过人工合成吸附型含砷施氏矿物(AD-Sch)和共沉淀型含砷施氏矿物(CO-Sch),模拟其在pH为3~9的酸碱性环境中的演变过程,观测和分析了矿物相转化、As(Ⅴ)的活化以及Fe(Ⅲ)和SO2-4的释放过程。结果表明:As(Ⅴ)的加入对矿物相转变有明显的抑制作用。pH的变化对含砷施氏矿物转化过程影响不显著,但是对As(Ⅴ)的活化、Fe(Ⅲ)和SO2-4的释放影响较为显著;酸性条件有利于3种施氏矿物(纯净施氏矿物(Sch)、AD-Sch、CO-Sch)中Fe(Ⅲ)的释放,碱性条件对SO2-4的释放更为有利,另外,CO-Sch中SO2-4的释放量和释放速率均高于AD-Sch。As(Ⅴ)的活化与As(Ⅴ)在含砷施氏矿物中的结合方式有关,酸性及中性条件下,AD-Sch中As(Ⅴ)的活化量随酸性的增强而增大,而CO-Sch中几乎没有As(Ⅴ)活化;碱性条件(pH=9)下培养200 d,CO-Sch中的As(Ⅴ)活化量达到7.19μmol/g,而AD-Sch中出现明显的As(Ⅴ)再吸附,仅活化0.04μmol/g。 The As(Ⅴ)-adsorbed schwertmannite(AD-Sch)and As(Ⅴ)-incorporated schwertmannite(CO-Sch)were synthesized,and the evolution in an acid-alkali environment with a pH of 3-9 was simulated.The transformation of mineral phase,the activation of As(Ⅴ),and the release of Fe(Ⅲ)and SO2-4from minerals were observed and analyzed.The results showed that the presence of As(Ⅴ)had apparent inhibitory effect on the transformation of mineral phase.pH had no significant effect on the mineral transformation,however,it influenced the activation of As(Ⅴ)and the release of Fe(Ⅲ)and SO2-4from minerals significantly.The release of Fe(Ⅲ)from schwertmannites(pure schwertmannite(Sch),AD-Sch,CO-Sch)was promoted under the acid condition,while the release of SO2-4was facilitated under the alkaline condition.In addition,the release amount and rate of SO2-4in CO-Sch were higher than those in AD-Sch.The activation of As(Ⅴ)was influenced by the binding pattern of As(Ⅴ)in the schwertmannites.The activation of As(Ⅴ)in AD-Sch increased with the decrease of pH under the acid and neutral conditions,while little As(Ⅴ)was activated in CO-Sch.Under alkaline condition(pH=9),the activation amount of As(Ⅴ)in CO-Sch reached 7.19μmol/g after 200 days of reaction,while 0.04μmol/g As(Ⅴ)activated in AD-Sch due to the re-adsorption of As(Ⅴ).
出处 《环境污染与防治》 CAS CSCD 北大核心 2021年第4期464-469,474,共7页 Environmental Pollution & Control
基金 四川省科技计划项目(No.2019YFSY0005) 重庆市生态环境局科研项目(No.2019-128)。
分类号 G63 [文化科学—教育学]
