Effect of surfactant molecular structure on perchlorate removal by various organo-montmorillonites

Luo, Wuhui; Sasaki, Keiko; Hirajima, Tsuyoshi

doi:10.1016/j.clay.2015.06.003

Cited by 26 publications

(3 citation statements)

References 40 publications

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“…The double reflections may be the result of the possible conformation of organic compounds intercalated in clay in which the possible conformations include paraffinic, bilayer or pseudotrimolecular [15]. A similar trend was reported for surfactant-intercalated montmorillonite with cetyl trimethyl ammonium bromide(CTAB) and benzyloctadecyldimethylammonium chloride when the value of the surfactant molar ratio to cation exchange capacity was greater than 1 [16][17][18]. Specific peak at around 28 o correspond to 3.35Å found in SAP and EDASAP-1 correspond to the presence of elemental silica probably in the form of quartz in very small quantity is identified.…”

Section: Materials Characterizationsupporting

confidence: 61%

N-[3-(Trimethoxysilyl)propyl] ethylenediamine Functionalized Saponite as Adsorbent of Nickel from Aqueous Solution

Fatimah¹,

Yudha²

2017

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Surface modification of saponite clay by surface functionalization using N-[3-(Trimethoxysilyl)propyl]ethylenediamine was performed. This study of the physicochemical characteristics of modified saponite as a function of its functional compound content was investigated using XRD, a gas sorption analyzer, FTIR, TG analysis and SEM. It was observed that the content of N-[3-(Trimethoxysilyl)propyl]ethylenediamine increases the basal spacing (d001) of the saponite structure, which changes the specific surface area and surface profile of the solid. The study of nickel adsorption provides evidence of the increased adsorption capacity of the modified saponite. The adsorption follows pseudo-second order kinetics and fits the Langmuir, Temkin and Dubinin-Radushkevich (D-R) adsorption isotherms. Increased content of the modifying agent results in increased adsorption capacity. The material is reusable because regenerated materials retain greater than 90% of the adsorption capacity of fresh material.

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Section: Materials Characterizationsupporting

confidence: 61%

N-[3-(Trimethoxysilyl)propyl] ethylenediamine Functionalized Saponite as Adsorbent of Nickel from Aqueous Solution

Fatimah¹,

Yudha²

2017

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“…They observed the following selectivity sequence (measured as % I ): NO 3 – > HCrO 4 – > SeO 4 2– ∼ SO 4 2– > HSeO 3 – > H 2 AsO 4 – . Perchlorate also has a low hydration energy and has been selectively adsorbed over nitrate, sulfate, carbonate, and phosphate (measured as K d , % R , and ∝) using surfactant modified clays and zeolites. ,− …”

Section: Electrostatic Selectivitymentioning

confidence: 99%

Exploring the Mechanisms of Selectivity for Environmentally Significant Oxo-Anion Removal during Water Treatment: A Review of Common Competing Oxo-Anions and Tools for Quantifying Selective Adsorption

Pincus

Rudel

Petrović

et al. 2020

Environ. Sci. Technol.

126

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Development of novel adsorbents often neglects the competitive adsorption between co-occurring oxo-anions, overestimating realistic pollutant removal potentials, and overlooking the need to improve selectivity of materials. This critical review focuses on adsorptive competition between commonly co-occurring oxo-anions in water and mechanistic approaches for the design and development of selective adsorbents. Six “target” oxo-anion pollutants (arsenate, arsenite, selenate, selenite, chromate, and perchlorate) were selected for study. Five “competing” co-occurring oxo-anions (phosphate, sulfate, bicarbonate, silicate, and nitrate) were selected due to their potential to compete with target oxo-anions for sorption sites resulting in decreased removal of the target oxo-anions. First, a comprehensive review of competition between target and competitor oxo-anions to sorb on commonly used, nonselective, metal (hydr)oxide materials is presented, and the strength of competition between each target and competitive oxo-anion pair is classified. This is followed by a critical discussion of the different equations and models used to quantify selectivity. Next, four mechanisms that have been successfully utilized in the development of selective adsorbents are reviewed: variation in surface complexation, Lewis acid/base hardness, steric hindrance, and electrostatic interactions. For each mechanism, the oxo-anions, both target and competitors, are ranked in terms of adsorptive attraction and technologies that exploit this mechanism are reviewed. Third, given the significant effort to evaluate these systems empirically, the potential to use computational quantum techniques, such as density functional theory (DFT), for modeling and prediction is explored. Finally, areas within the field of selective adsorption requiring further research are detailed with guidance on priorities for screening and defining selective adsorbents.

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“…Compared with the pure clay, the clay with the PEOfree PCEs and SNF showed different degrees of increase in interlayer water, but not over 1%. From $450°C to 700°C and the DTG event at $600°C, all the clays showed a similar weight loss of $2·5%, which can be assigned to dehydroxylation of the clay (Guggenheim and Groos, 2001;Luo et al, 2015). From $300°C to 450°C, the DTG event at $380°C reveals a significant weight loss ($8%) for the clay with the TPEG-type PCE.…”

Section: Water Adsorption On Claymentioning

confidence: 89%

Cement dispersion performance of superplasticisers in the presence of clay and interaction between superplasticisers and clay

Xing¹,

Wang²,

Fang³

2017

Advances in Cement Research

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A study of superplasticisers (SPs), including polyethylene oxide-free type polycarboxylate superplasticisers (PCEs), a conventional PCE and a polycondensate, was carried out to research their cement dispersion behaviour and interactional behaviour with clay. It was found that the cement dispersion performance of SPs in the presence of clay is dependent on both the cement dispersing capability and clay sensitivity. The sensitivity of superplasticisers to the presence of clay was investigated systematically through a study of water and SP adsorption (surface and interlayer) on the clay. It was found that clay sensitivity is dependent on the clay adsorption of both water and the SP. The behaviours of cations (surface and interlayer) of clay interacting with different SPs were also investigated and the interactional mechanism between SPs and clay was clarified. This work will aid further understanding of the effects of clay in concrete and help in the design of SPs with enhanced clay tolerance. NotationL 0 cement paste spread (cm) at water/cement (w/c) ratio of 0·49 without superplasticiser (SP) and clay L 1 cement paste spread (cm) with a certain dosage of SP and no clay at a w/c of ratio 0·49 L 2 cement paste spread (cm) with a certain dosage of SP and clay at a w/c of ratio 0·49 m 1 weight (g) of SP m 2 weight (g) of drying clay V volume (ml) of methylene blue solution consumed

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Effect of surfactant molecular structure on perchlorate removal by various organo-montmorillonites

Cited by 26 publications

References 40 publications

N-[3-(Trimethoxysilyl)propyl] ethylenediamine Functionalized Saponite as Adsorbent of Nickel from Aqueous Solution

N-[3-(Trimethoxysilyl)propyl] ethylenediamine Functionalized Saponite as Adsorbent of Nickel from Aqueous Solution

Exploring the Mechanisms of Selectivity for Environmentally Significant Oxo-Anion Removal during Water Treatment: A Review of Common Competing Oxo-Anions and Tools for Quantifying Selective Adsorption

Cement dispersion performance of superplasticisers in the presence of clay and interaction between superplasticisers and clay

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