New application of lanthanum-modified bentonite (Phoslock (R)) for immobilization of arsenic in sediments
文献类型：期刊论文
| 作者 | Cui, Jingzhen; Wang, Dan; Lin, Juan; Wang, Yan; Ren, Mingyi; Yang, Youwei; Shi, Pengling |
| 刊名 | ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
 |
| 出版日期 | 2020 |
| 卷号 | 28期号:2页码:2052-2062 |
| 英文摘要 | Lanthanum-modified bentonite (LMB, Phoslock (R)) is a well-known capping agent for phosphorus immobilization in sediments. Herein, LMB was used to immobilize As in sediments. Batch capacity experiments for arsenate and arsenite adsorption were carried out to obtain adsorption isotherms and kinetics using the Langmuir and Freundlich model calculations. High-resolution (HR) diffusive gradients in thin films (DGT) were applied to monitor the changes of weakly bound As fraction near sediment-water interface (SWI). The interaction of As(III) and As(V) with LMB was influenced by pH and initial mineral composition. As(V) was more obviously adsorbed than As(III) at pH 4 to 9, with mean adsorption of 3.89 mg g(-1)and 0.04 mg g(-1), respectively, while at pH > 9 As(III) was preferentially adsorbed. After LMB amendment for 2 months, the maximum As removal efficiency in the pore and overlying water reached 84.5% and 99.3%, respectively. The capping agent remained stable in the top sediments, while the maximum DGT labile As content decreased to 0.89 and 0.51 mu g L(-1)in dosage-and time-treatments. The As concentration inflection point moved down to a deeper layer. As species changed from labile exchangeable-As to Fe-oxide-bound and residual As. The proportion of mobile As finally decreased to 10.5% of the total As in the upper 20-mm layer sediment. The increase ofK(d)(the distribution coefficient at SWI) andk(1)(adsorption rate constant) and the decrease ofT(c)(response time of (de)sorption) in the DGT-induced fluxes model (DIFS) indicated the time-dependent impediment of As release from the sediment due to LMB immobilization. |
| 源URL | [http://159.226.73.51/handle/332005/20219]  |
| 专题 | 中国科学院南京地理与湖泊研究所 |
| 推荐引用方式 GB/T 7714 | Cui, Jingzhen,Wang, Dan,Lin, Juan,et al. New application of lanthanum-modified bentonite (Phoslock (R)) for immobilization of arsenic in sediments[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2020,28(2):2052-2062. |
| APA | Cui, Jingzhen.,Wang, Dan.,Lin, Juan.,Wang, Yan.,Ren, Mingyi.,...&Shi, Pengling.(2020).New application of lanthanum-modified bentonite (Phoslock (R)) for immobilization of arsenic in sediments.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,28(2),2052-2062. |
| MLA | Cui, Jingzhen,et al."New application of lanthanum-modified bentonite (Phoslock (R)) for immobilization of arsenic in sediments".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 28.2(2020):2052-2062. |
入库方式： OAI收割
来源：南京地理与湖泊研究所
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