Bentonite Activation

The sodium removal percentage for bentonite activated for 3 h increases with activation temperature. For bentonite activated for 6 and 12 h, the trend in sodium removal follows the trend observed for the specific surface area shown in Figure 2.

2014. Structural modification of clay minerals is necessary to improve their applicability. Bentonite from Nkaliki was treated with different concentrations of sulphuric acid ranging from 0.5 – 5.5mol/l to investigate the effects of acid activation on the structure and properties of the treated samples.

3.1 Activation of Bentonite Bentonite activation is chemically treated using HCl. This serves to convert the cations present in the pores of bentonite with H+ 3+ions and to cause the delamination of the release process of Al3+, Fe, Mg2+from bentonite. This …

A new method of Na-activation of raw bentonite, rich in Ca-montmorillonite, consisting of combined thermal treatment at 200 °C, followed by immediate impregnation with aqueous solution of Na2CO3 ...

By applying activation techniques, the reactivity of bentonite can be improved, and its incorporation levels can be maximized. In this study, the influence of mechanical and thermo-mechanical activation of bentonite is investigated on …

The acid activation of bentonite caused an increase in the amount of Si +4 and Ti +4; this increase could be attributed to the remobilization of cations in the octahedral or tetrahedral sites (Venaruzzo et al. 2002). However, the alumina content decreased from 20.04% (NB) to 18.76% (AAB); this decrease could be attributed to the dealumination ...

The bentonite activation was done at two different reflux times (1 and 3 hour), and three different acid concentrations (1 M, 2.5 M and 5 M). To assist the interpretation of results, the bentonite samples were also studied using XRF and XRD. Bleaching power of active bentonite was initially studied using adsorption of methylene blue for optimation,

purification has become a topic of research. In this study, the use of bentonite clay modified by acid activation is proposed. Sulfuric acid, acetic acid (v-acid/w-clay ratio=20, 40 and 60%) and sulfuric/acetic mixtures (1:1 ratio) were used in the bentonite clay activation. The activated clays were used in the UMO

Effects of Bentonite Activation Methods on Chitosan Loading Capacity. The adsorption capacity of bentonite clay for heavy metal removal from wastewater can be significantly enhanced by a high loading of chitosan on the …

In the ironmaking process, the addition of an organic binder to replace a portion of bentonite has the potential to improve the performance of pellets. The interaction between original bentonite (OB) and organic binder was investigated. Results indicated that the micromorphology of organic composite bentonite (OCB) became porous and the infrared difference spectrum …

Bentonite is activated by the application of inorganic acids (such as H 2 SO 4 or HCl) for replacing the exchangeable ions of bentonite during chemical procedure. Physical procedure involves mechanical improvement of …

This work included the activation of bentonite clay using two different methods, which are the physical method and the chemical method, in order to determine the optimal method for obtaining bentonite as a drilling fluid with excellent properties. The physical method included the use of ultrasound on bentonite in the presence of water, which ...

Bentonite activation was performed with three different concentration of H 2 SO 4 (3, 5, and 10 N), in order to investigate the impact of acid concentration on the surface area. Compared with natural bentonite, acid-activated bentonite …

The varying in the cation exchange capacity (CEC) for Cr(VI) & Co(II) cation exchange by H 2 SO 4 concentration used in bentonite activation is illustrated in Figures (9 &10).

The efficiency of bentonite activation was assessed by chemometrics and Artificial neural networks mathematical modeling. Principal component analysis and analysis of

Acid activation technique was opted for modifying natural bentonite (NB) to enhance the adsorptive removal of CIP from water. The BET surface area analysis revealed that acid …

Abstract A study is performed of the effect the means of activation of bentonite-like clays (acidic, alkaline, combined) have on the adsorption characteristics of Fe3+ ions under static conditions. The mechanism of the acidic and alkaline activation of montmorillonite is identified and found to depend on the concentration of the activating agent. Solutions of sulfuric acid and …

A new method of Na-activation of raw bentonite, rich in Ca-montmorillonite, consisting of combined thermal treatment at 200 °C, followed by immediate impregnation with aqueous solution of Na2CO3 of concentration corresponding to 0.5, 1.0, 1.5, or 2.0 cation exchange capacity (CEC) of clay, was investigated. Structural and compositional evolution of …

A bentonite from Kirkouk city region (Iraq) was activated with H 2 SO 4 at various ratios (5, 10, 15, 20 %). Due to ion exchange, the original (Ca, Mg, Na, K)-bentonite was converted to H ...

L'efficacité de cette activation et l'accroissement de la capacité d'adsorption de la bentonite sont clairement apparus grâce à l'exploitation des isothermes de Freundlich et de Langmuir.

Acid activation technique was opted for modifying natural bentonite (NB) to enhance the adsorptive removal of CIP from water. The BET surface area analysis revealed …

Handbook of Clay Science. P. Komadel, J. Madejová, in Developments in Clay Science, 2013 Abstract. Acid activation is a common chemical modification of clays, usually bentonites, with a hot solution of a mineral acid (typically HCl or H 2 SO 4), and it is used for both scientific and industrial purposes.The aim is to obtain partly dissolved material of increased specific surface …

We aimed to investigate the effectiveness of activated bentonite in OMWW treatment. Batch and column techniques were applied. Crude and treated OMWW samples were characterized; physiochemical parameters, total …

Most researchers used bentonite activation temperature between 201 and 800°C for 3 h activation time to get the best performance in the concrete properties. 3. Also, most of the studies found …

The activation of bentonite results in an increase in the number of active sites, increase the pore volume, increase the surface area, etc. The major process of activation is thermal and acid activation. The acid activation is mostly carried out by sulphuric acid or hydrochloric acid. This activation process is carried out in a ratio of 1:3 to ...

work was to enhance the bleaching activity of Iraqi bentonite after activation by sulfuric acid. The study is also aims to discuss the variation of some of physicochemical properties of Iraqi bentonite after acid treatment. 2- Experimental 2-1 Materials . Bentonite (CaB) was obtained from the bed in the Al-anbar region in IraqIts basic. clay

The acid activation of an Algerian bentonite was investigated using a factorial 33 experiment design in order to improve the bleaching capacity in the colza oil processing. Optimized acid ...

The activation of bentonite clay using acid treatment also raises important considerations regarding environmental sustainability. 2. Materials and Methods 2.1. Sample Collection and Preparation. Bentonite clay of Hadar, Afar Regional State, Ethiopia (Figure 1), was obtained from Ethiopian Ministry Mining, Research Directorate Office [18, 19].

The main goal of this research is to increase the adsorption capacity of bentonite clay by modifying its properties by treatment with organic acid. Activation of bentonite clay in …

Herein, the facile one step acid activation of bentonite derived functionalized adsorbent (AB) for the effective remediation of both ionic and non-ionic secondary pesticides, …