Adsorbents based on montmorillonite for contaminant removal from …
Özcan and Özcan (2004) found that the adsorption capacity of acid red 57 and acid blue 294 on AMt reached 416.3 and 119.1 mg/g, respectively, according to the Langmuir equation. They attributed this high adsorption capacity to the positive charge on AMt surface.
Cation exchange to montmorillonite induces selective adsorption …
Considerable adsorption of L-Arg to 2 g/L montmorillonite was observed over a wide concentration range at pH 5 in NaCl (Fig. 1). By extending to higher concentrations, the maximum binding capacity to montmorillonite under these conditions was constrained (629 ± 13 μmol/g) by fitting a Langmuir isotherm to the data.
Removal of dichromate-, molybdate-, and nitrate ions from …
The purpose of the presented work was to invert the adsorption capacity of natural montmorillonite from cationic to anionic and to study the adsorption of inorganic anions on the surface of modified montmorillonite. As model anions along with the above described Cr 2 O 7 2-, and MoO 4 2-, NO 3 – were also investigated. Despite the fact that ...
Specific ion effects: The role of anions in the aggregation of
Anion adsorption on montmorillonite particles in equilibrated solutions was measured by ion chromatography. ... Further, phosphate has the largest adsorption capacity …
Influence of montmorillonites exchange capacity on the …
When cation–anion surfactants are intercalated into Mt at the same time, the formed strong distribution medium can remove pollutants cooperatively. Therefore, the adsorption property of cation–anion OMt is better than single cationic or anionic OMt [15] and some other properties are also improved significantly.
Adsorption of Anions on Minerals
The adsorption capacity reached the maximum value of around 2.6 mg/g at pH 3.8 on hematite, which was decreased with increased pH. The hematite could move into bentonite's interlayer space when mixed with bentonite at pH 6.0. The adsorption capacity of the hematite-bentonite system was lower than that of hematite . Magnetite is attractive for ...
Functionalization of reduced montmorillonite as an …
Montmorillonite (Mt) is widely used in various fields due to its abundant resources and excellent adsorption performance, while the hydration and adsorption properties of raw or functionalized Mt are affected by its intrinsic property, layer charge density (LCD). Herein, a series of reduced-charge montmorillonites (RC-Mt) with high, medium, and low layer charges were …
Substantial improvement in the adsorption behavior of montmorillonite …
Our results showed that the HDA modification remarkably improved the adsorption ability of montmorillonite toward TZ molecules. The highest adsorption efficiency was achieved >98% at the pH range of 4–6 within a fast process (less than 30 min). The maximum adsorption capacity Mt-HDA toward TZ molecules was found to be ~59 mg/g at 45 °C.
Adsorption of cationic and anionic dyes on montmorillonite …
Montmorillonite was employed as adsorbent to remove cationic and anionic dyes respectively and simultaneously. When the dye present singly, it only had a good effect to …
Chapter 12.10 Cation and Anion Exchange
Weiss et al. (1956) found that the anion exchange capacity depends on the diameter of the montmorillonite particles if their shape is assumed to be almost regular. This would be expected if the anion exchange occurs on the edges. From the adsorption of fluoride ions, the authors derived average diameters of montmorillonite particles of 300 ...
Adsorption of anionic dye onto homoionic montmorillonite…
The objective of this study was to investigate the adsorption of anionic dye represented by Congo red (CR) using adsorbents prepating from Wyoming montmorillonite (Mt). The first group of adsorbents named homoionic montmorillonite (HMt) was obtained using Ca2+, Mg2+, Na+, and K+, while the second group called modified …
Preparation and Corrosive Anion-curing Capability of …
The passive film of reinforcing steel in marine concrete is damaged by the infiltration of chloride and sulfate ions. Layered double hydroxide (LDH) can adsorb anions and release interlayer ions to form passive films due to its ion exchange property. A Mg-Al-NO3 layered double hydroxide/montmorillonite (LDH/Mnt) composite inhibitor was prepared by layer …
Cation exchange capacity of the different …
The theoretical maximum adsorption capacity of the CB30 hydrogel with 30 wt% clay loading was found to be 45.77 mg g⁻¹, which was the highest value among other fabricated hydrogels.
Montmorillonite for Adsorption and Catalytic …
Clay minerals have been recognized as one of the cheap and effective materials for wastewater remediation. Among the various clay minerals, montmorillonite (MMT) has received much attention due to its wide availability, …
Simultaneous adsorption of cadmium, zinc, and lead ions …
The maximum adsorption capacity from the Langmuir model was 91.6, 164.9, and ... respectively, in octahedral positions within the hydroxide layers; A − n is an anion and the charge densities of ... Journal of Colloid and Interface Science Removal of methylene blue from colored effluents by adsorption on montmorillonite clay. J. Colloid ...
Montmorillonite modified with hexadecylpyridinium …
These data revealed that the anion uptake on HDPyCl-montmorillonite accompanied with release of chloride ion into solution through anion-exchange processes. ... The adsorption isotherms showed that the drug capacity adsorption was influenced by the amount of surfactant incorporated into the bentonite, the packing density and the arrangement of ...
Al30 polycation pillared montmorillonite preparation and …
Common modification methods of MMT can be applied to achieve anion adsorption and to enhance the adsorption capacity, including inorganic modification, organic modification and inorganic/organic composite modification. ... These two absorption bands indicate that there is adsorbed water between the layers of montmorillonite. Absorption bands ...
Characterization of anion–cationic surfactants modified montmorillonite
The anion–cationic surfactant modified montmorillonite (MMT) were prepared. Anionic surfactant can be intercalated into the interlayer spaces of MMT. Organic carbon content of MMT can be improved by anion–cationic modification. The anion–cationic surfactant modified MMT has the largest sorption capacity. The adsorption of methyl orange is spontaneous and …
Adsorption of Cr (VI) and As (V) on Chitosan-Montmorillonite
Chitosan-montmorillonite was prepared by adding an amount of chitosan equivalent to 500% of the cation exchange capacity (CEC) at pH 5 and 75°C. The resulting anion exchange capacity was ∼0.34 mol c /kg. The adsorption properties for As(V) and Cr(VI) were determined with the batch technique at pH 3 to 9.
Cation exchange capacity of the different montmorillonites.
The theoretical maximum adsorption capacity of the CB30 hydrogel with 30 wt% clay loading was found to be 45.77 mg g⁻¹, which was the highest value among other fabricated hydrogels.
LDH(Mg/Al:2)@montmorillonite nanocomposite as a novel anion …
The adsorption isotherms of Pb²⁺, Cu²⁺, Ni²⁺ and Cd²⁺ fit with monolayer adsorption models and the adsorption capacity can reach up to 1.34, 1.31, 0.98 and 0.50 mmol/g respectively ...
Montmorillonite modified with hexadecylpyridinium …
These data revealed that the anion uptake on HDPyCl-montmorillonite accompanied with release of chloride ion into solution through anion-exchange processes. ... The adsorption capacity of ...
Enhanced adsorption of perchlorate by gemini surfactant …
Montmorillonite (Mt) was modified with gemini surfactants (GC n) of varied chain length. The loading amount of GC n onto Mt was lesser than single-chain surfactants. Maximum ClO 4 − uptake capacity of 1.08 mmol/g was achieved by GC 16 –8-Mt. The ClO 4 ˉ uptake was rapid with 95% removal in 1 min. and reached maximum in 15 min.. The GC n-Mt showed …
Mechanism of Inversion of Montmorillonite Sorption …
Abstract Organo-mineral derivatives of montmorillonite modified by salts of quaternary ammonium compounds are promising adsorbents for wastewater purification from …
Adsorption of amino acids by montmorillonite and gibbsite: Adsorption …
Adsorption reactions play an influential role in the partitioning and uptake of chemicals. Even at low concentrations, amino acids are strongly adsorbed by clay minerals such as kaolinite and montmorillonite (Hedges and Hare, 1987).Clay minerals such as montmorillonite have a large surface area and high cation exchange capacity (CEC).
Simultaneous adsorption of cadmium, zinc, and lead ions …
The maximum adsorption capacity from the Langmuir model was 91.6, 164.9 ... respectively, in octahedral positions within the hydroxide layers; A − n is an anion and the charge densities ... Journal of Colloid and Interface Science Removal of methylene blue from colored effluents by adsorption on montmorillonite clay. J. Colloid Interface ...
Structural and Thermal Properties of Montmorillonite/Ionic …
Abstract. Composites of montmorillonite K10 (MMT K10) and ionic liquid (IL) containing a 1-butyl-3-methyl-imidazolium cation ([BMIm] +) and various anions, such as bis …
Adsorption of anion and cation dyes onto pillared …
Al2O3- and Al(Ce)2O3-pillared montmorillonite materials were synthesized using the intercalation of large-sized polyhydroxocomplexes of aluminum and aluminum/cerium in …
Specific ion effects: The role of anions in the aggregation …
Anion adsorption on montmorillonite particles in equilibrated solutions was measured by ion chromatography. ... The cation exchange capacity and spe-cic surface area (S) were determined to be 84.8 cmol (+) / kg and 716 m2/g, respectively, using the method of Li et al. (2011). The surface charge density (σ) was estimated to
Enhanced bifunctional adsorption of anionic and cationic …
The cation exchange of montmorillonite and the anion exchange characteristics of LDH are skillfully utilized without introducing other cation pollutants. ... 308.15, and 318.15 K, …