CTMAB-Modified Bentonite–Based PRB in Remediating Cr(VI) Contaminated Groundwater

Wang, Fei; Xu, Wangqi; Xu, Zhaochen; Liu, Haoyu

doi:10.1007/s11270-019-4386-4

Cited by 14 publications

(5 citation statements)

References 41 publications

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“…Recently, synthesized polymer materials, biomass, new carbon materials, and new materials (nano zero valent iron) [11] Adsorbents such as clay ore (montmorillonite) have also been extensively studied, and different adsorbents have their own unique advantages. The adsorption method is easy to operate and the adsorption material is cheap and easy to obtain, but there is a problem of saturated adsorption capacity during the use of the adsorbent [1], Frequent replacement is necessary, and post-treatment of the adsorbent after use is also a very important issue. If not handled properly, it can cause secondary pollution.…”

Section: Adsorption Methodsmentioning

confidence: 99%

“…Atomic energy, also known as nuclear energy, has become an important direction in the scientific field for over 100 years due to its advantages of efficiency, cleanliness, safety, and abundant reserves [1]. While nuclear energy brings convenience to humanity, some problems also arise, such as the Chernobyl nuclear leak in 1986 and the Fukushima nuclear power plant accident in 2011, which have shown people the potential for significant harm in the process of nuclear energy utilization [2].…”

Section: Introductionmentioning

confidence: 99%

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Treatment Method of Radioactive Waste Liquid Containing U and Cs

Yin,

Lu,

et al. 2023

IJE

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Radioactive waste liquid will not only cause heavy metal and radiation pollution in the environment, but also enter the human body from a variety of ways, threatening human life and health. Among them, uranium and cesium, due to their high fission yield, long half-life and high solubility of salt compounds in water, need to be treated urgently. The treatment methods of radioactive u and C waste liquid, such as ion exchange method, solvent extraction method, adsorption method, membrane separation method, chemical precipitation method, biological treatment method, adsorption method and combined process, are combed. The principle, characteristics and application of the method are reviewed, and the research direction and development trend are prospected. It has a certain reference value for the selection of radioactive waste treatment methods in different situations.

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Section: Adsorption Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Treatment Method of Radioactive Waste Liquid Containing U and Cs

Yin,

Lu,

et al. 2023

IJE

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“…Cetyltrimethylammonium bromide (CTMAB) is a modifier used to improve the adsorption and impermeability of bentonite. Studies have shown that CTMAB-modified bentonite effectively adsorbs heavy metals, organic pollutants, and organic dyes from water [ 11 , 12 , 13 ]. Kaolin is mainly composed of kaolinite, illite, and a small amount of montmorillonite and is a new and inexpensive adsorptive material.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Organic Contaminant Retardation by CTMAB-Modified Bentonite Backfill in Cut-Off Walls: Laboratory Test and Numerical Investigation

Shu

et al. 2023

Materials

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Adding organically modified bentonite into impervious wall materials may improve the adsorption of organic pollutants. In this study, cetyltrimethylammonium bromide organically modified bentonite (CTMAB bentonite) was mixed with sodium bentonite and kaolin to obtain two materials, which were then used as cut-off walls for typical pollutants. Soil column consolidation tests, diffusion tests, and breakdown tests were conducted to study migration of organic pollutants in soil columns. The parameter sensitivity of pollutant transport in the cut-off wall was analysed by numerical simulation. The sodium bentonite mixed with 10% CTMAB bentonite and kaolin-CTMAB bentonite showed the greatest impermeability: with a consolidation pressure of 200 kPa, the permeability coefficients were 1.03 × 10−8 m/s and 3.49 × 10−9 m/s, respectively. The quantity of phenol adsorbed on sodium bentonite-CTMAB bentonite increased with increasing water head height. The kaolin-CTMAB bentonite column showed the best rhodamine B adsorption performance, and the adsorption rate reached 98.9% on day 67. The numerical results showed that the permeability coefficient was positively correlated with the diffusion of pollutants in the soil column. The quantity adsorbed on the soil column was positively correlated with the retardation factor, and the extent of pollutant diffusion was negatively correlated with the retardation factor. This study provides a technical means for the optimal design of organic pollutant cut-off walls.

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“…The PRB is an effective technology for in situ remediation of Cr(VI) contaminated groundwater in the field (Blowes et al 1997), the key part of which is the reactive media filled in PRB and the reaction zone formed. The most applied reactive media in PRB are zero-valent iron (ZVI) (Cang et al 2009, Fu et al 2014, Qiu et al 2020, Wei et al 2016, Weng et al 2007), activated carbons (Huang et al 2015, Su et al 2019, zeolites (Buenano et al 2017, Kesraoui-Ouki et al 1993, Li et al 2014, Peric et al 2004, bentonite (Wang et al 2020, Zhang et al 2012) and emulsified vegetable oil (EVO) (Harkness &Fisher 2013, Watson et al 2013, Wen et al 2017. EVO is an important biodegradable reactive media filled in PRB technology for Cr(VI) reduction.…”

Section: Introductionmentioning

confidence: 99%