Behavior of nanobentonites in adsorption of cesium and strontium

IF 0.8 4区 工程技术 Q4 ENGINEERING, CHEMICAL Membrane Water Treatment Pub Date : 2021-09-01 DOI:10.12989/MWT.2021.12.5.245
Mohammad-Ali Ostovaritalaba, M. Hayati-Ashtiani
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引用次数: 0

Abstract

Bentonites contain a large amount of montmorillonite and this nano-structured and nano-porous member of the smectite group determines the adsorption properties of bentonites. In this study, four types of Iranian commercial bentonite clays have been examined to determine the adsorption capacity of cesium and strontium. The physicochemical and mineralogical properties of the four types have been experimentally analyzed with the focus on the moisture content, pH, dry (granulometric) and wet screen analyses; swell, sediment and Methylene Blue (M.B.) indices; cation exchange capacity (C.E.C) measurements. The pH and C.E.C values of B3 were 9.48 and 71.9 mEq/100g, respectively. The high values of C.E.C; swell, sediment and M.B. indices along with the high amount of granulometric values (particles finer than 36 um) showed that the B3 had a high amount of montmorillonite. X-Ray Fluorescence (XRF) analysis showed that the major of competing cations such as Ca2+ and K+ existing in B2 affects the Sr adsorption. The experimental analysis also showed that B2 had almost high pH and C.E.C values as well. The results of the separation process of Cs and Sr indicate that the B3 and B2 have the highest adsorption capacity of 59.75 and 45.5 for Cs and Sr adsorption, respectively.
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纳米膨润土吸附铯和锶的行为
膨润土中含有大量的蒙脱石,这种纳米结构和纳米多孔的蒙脱石基团决定了膨润土的吸附性能。在本研究中,对四种类型的伊朗商品膨润土粘土进行了测试,以确定其对铯和锶的吸附能力。对这四种类型的物理化学和矿物学性质进行了实验分析,重点是水分含量、pH值、干(粒度)和湿筛分析;涌浪、沉积物和亚甲基蓝(M.B.)指数;阳离子交换容量(C.E.C)测量。B3的pH值和C.E.C值分别为9.48和71.9mEq/100g。C.E.C的高价值;溶胀、沉积物和M.B.指数以及大量的粒度值(小于36um的颗粒)表明B3具有大量的蒙脱石。X射线荧光(XRF)分析表明,B2中存在的主要竞争阳离子如Ca2+和K+影响Sr的吸附。实验分析还表明B2具有几乎高的pH值和C.E.C值。Cs和Sr的分离过程的结果表明,B3和B2对Cs的吸附量最高,分别为59.75和45.5。
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来源期刊
Membrane Water Treatment
Membrane Water Treatment ENGINEERING, CHEMICAL-WATER RESOURCES
CiteScore
1.90
自引率
30.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Membrane and Water Treatment(MWT), An International Journal, aims at opening an access to the valuable source of technical information and providing an excellent publication channel for the global community of researchers in Membrane and Water Treatment related area. Specific emphasis of the journal may include but not limited to; the engineering and scientific aspects of understanding the basic mechanisms and applying membranes for water and waste water treatment, such as transport phenomena, surface characteristics, fouling, scaling, desalination, membrane bioreactors, water reuse, and system optimization.
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