Obtaining adsorbents from acid and acid-thermal activation of bentonite
One of the most common chemical modifications of clay minerals, used for both industrial and scientific purposes, is their acid activation. This consists of the reaction of clay minerals with a mineral acid solution, usually HCl or H 2 SO 4.The main task is to obtain partly dissolved material of increased specific surface area, porosity and surface acidity (Vengris et …
Application of Acid Activated Bentonite for Efficient Removal …
Abstract. Environmental and health issues are critical challenges for sustainable development in the 21st century; therefore, this paper investigates a simple and cost-effective process for recovery of organic matter (OM) from phosphoric acid to provide environmentally acceptable P-fertilizer. This study analyzed the structural transformations and adsorption …
Application of Acid Activated Bentonite for Efficient Removal …
Similar effects of phosphoric acid concentration on organic matter uptake have been reported for other sorbents, such as sulfuric acid-activated bentonite, waste sludge, low quartz kaolinite, and ...
Adsorption of organic matter from industrial …
ORIGINAL ARTICLE Adsorption of organic matter from industrial phosphoric acid (H 3PO 4) onto activated bentonite Be´chir Khoualdia a,*, Mouna Loungou b, Elimame Elaloui a a Materials, Environment ...
Insights on applications of bentonite clays for the removal …
Different organic (acetic acid, citric acids, and oxalic acid) and inorganic acids (HCL, H 2 SO 4, and H 3 PO 4) are used for acid activation (Avila et al. 2021; Javed et al. 2018; Kausar et al. 2021; Khan et al. 2019; Yildiz et al. 2004). In acid activation using inorganic acid, the inorganic cation in the interlayer structure of bentonite is ...
Synergistic modification of bentonite by acid activation and …
In this paper, we proposed a facile modification strategy to enhance adsorption performance of bentonite utilizing synergistic acid activation and hydroxyl iron pillaring, by …
Chemical-Vapor-Deposited Copper on Acid-Activated Bentonite …
A heterogeneous Cu/clay catalyst was synthesized by dispersing copper onto the surface of bentonite clay through chemical vapor deposition (CVD). To resolve the copper leaching problem during the catalyst's application in aqueous reaction, a critical pretreatment step, acid activation by H2SO4, was applied to the original bentonite clay. Such manufactured …
Obtaining adsorbents from acid and acid-thermal activation …
The adsorption follows a spontaneous, endothermic and physical adsorption. The study shows that acid activated bentonite or acid-thermal activated bentonite can be used as a …
Investigation of acid-activated iron-based bentonite …
A 0.3-g quantity of the prepared bentonite material (sodium bentonite, acid-activated bentonite, iron-based bentonite, or iron-based acid-activated bentonite) was placed in each bottle, followed by the addition of a predetermined volume of the target substance (30 mg/L DMDS solution), and an appropriately proportioned oxidant (H 2 O 2). The ...
Characteristics of Raw and Acid-Activated Bentonite …
purpose, it is important to investigate both raw bentonite (RB) and acid-activated bentonite. This study aims to improve the quality of tap water used for wire electrical discharge machining; the study focuses on decreasing the electrical conductivity of tap water using a low-cost adsorbent such as RB or acid-activated bentonite.
Adsorption of organic matter from industrial phosphoric acid (H3PO4
The phosphoric acid used as reference was obtained by continuous stirring at room temperature of phosphoric acid with activated carbon of less than 0.15 mm in size, during a whole day.The acid obtained was filtered on paper filter and the above procedure was repeated for five days, until the phosphoric acid was O.M. free and used as a blank in the UV …
Activation of Jordanian Bentonite by Hydrochloric Acid and …
2.2. Activation of Bentonite by Hydrochloric Acid. The hydrochloric acid (HCl) (98%, d = 1.98 g/cm 3) and other chemicals used are of analytical grade. The purified bentonite was prepared for acid activation: 15 g ± 0.01 g of the purified sample was weighed into a flask and 200 mL of 1.0 M HCl was added.
Structural Property Improvements of Bentonite with Sulfuric Acid …
The acid activation of bentonite from Middle Anatolia, consisting of mostly montmorillonite, with a hot solution of H 2 SO 4 with different concentrations was carried out. SEM images, nitrogen sorption isotherms and FTIR spectra were used to examine structural changes of the bentonite with acid activation. Acid–base titration method was applied to determine surface acidities. …
Acid Activation of Bentonites and Polymer-Clay …
Acid activation has been used for decades to prepare bleaching earths for adsorbing impurities from edible and industrial oils. Organic treatment has sparked an explosive interest …
Acid Activated Indian Bentonite, an Efficient Catalyst for
To prepare acid activated Indian bentonite, the Indian bentonite was slurried with water and then mixed with conc. H 2 SO 4 (98%) at predetermined acid/clay ratio of 0.30 so as to form a clay slurry, which was heated on a water bath at 90 °C for 16 h with constant stirring (pH 1.84). At the end of the reaction time the activation was stopped ...
Potential of Acid-Activated Bentonite and SO
Compared with the acid-activated bentonite, SO 3 H-MWCNTs provided better catalytic performance. Despite more favorable economic preparation of the 5 N acid-activated bentonite and its relatively similar performance in terms of FFA reduction with the SO 3 H-MWCNTs, the latter catalyst proved more feasible for industrial application. This ...
Optimization of bleaching power by sulfuric acid activation of bentonite
Acid activation was carried out by heating muds prepared from Ca-rich bentonite (CaB), sulfuric acid (H 2 SO 4) and distilled water, yielding various bleaching earths (BEs).The roles of each of the process variables, namely mass fraction of H 2 SO 4 (x) in the dried CaB and pure H 2 SO 4 mixture, heating temperature (T) and contact time (t), in the activation were tested.
Isotherm modeling of organic activated bentonite and humic acid …
The adsorbents, an organically activated bentonite (OAB) and a humic acid polymer (HAP), were tested in a common in vitro model with a pH course comparing the maximum pH changes that can be expected in the digestive system of a monogastric animal, i.e. pH 7.4 for the oral cavity, pH 3.0 for the stomach, and pH 8.4 for the intestines.
Modification of bentonite clay & its applications: a review
bentonite composite, Fe-Modified bentonite, Hydroxyl-Fe-pillared-bentonite, Organo Bentonite, Organophilic clay, Arenesulfonic Acid-Functionalized Bentonite, Bentonite clay modified with Nb O . The
Recent advances of application of bentonite-based …
In this review, we firstly summarized the modification of bentonite-based composites using various methods such as acid/alkaline washing, thermal treating and hybrids (e.g., polymer, clay mineral, magnetic and other modification); Then the recent advances of removal of organic (e.g., dyes, microplastics, phenolic organic contaminants and other organics) and inorganic …
Structural and Surface Modification of Oxalic-Acid …
The aim of this study is to investigate the oxalic acid activation of bentonites containing different types of smectites, analyse their surface modification as a function of acid concentration and create good quality …
Modification of bentonite by combination of reactions of acid …
On the other hand, no significant changes in the organic content were obtained when the silylation reaction was performed on previously acid-activated bentonite. When a sample of silylated and activated bentonite was further modified by cationic exchange reaction, it was found that the previous treatments allowed increasing the uptaken amount ...
(PDF) Activation of Bentonite Clay with H2SO4 and Study …
This means that cation (H + ) loaded onto bentonite when activation with H 2 SO 4 acid should have different abilities to replace different cations by ion exchange. ... at pH2 and organic dyes ...
Livestock Acid-Activated
18 Acid-activated bentonite is a synthetic substance petitioned for addition to 7 CFR 205.603 as a poultry litter ... 76 ammonia emissions due to the breakdown of uric acid and organic nitrogen. Atmospheric ammonia is 77 detrimental to poultry welfare (Miles, Branton and Lott 2004). To control ammonia volatilization, acid-
(PDF) Acid activation of bentonite clay for recycled …
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 treatment in a ratio of 1:4 w/v, using batch adsorption processes (contact time=12 min).
Surface activation of fuller's earth (bentonite …
These characteristics can be modified by treatment with organic acids, which is the safest method for enhancing the properties of fuller's earth. ... Keywords bentonite, characterization, acid ...
Bleaching of Vegetable Oil using Organic Acid …
Pakistan is adsorption by inorganic acid activated fuller's earth (bentonite clay). Treatment with inorganic acid (Sulfuric acid and hydrochloric acid) activated bentonite clay is very efficient and shows satisfactory results. But there is a major disadvantage associated with its use. Fumes of hydrochloric acid or sulfuric
Optimization and Characterization of Acid- Activated …
Abstract- The acid-activated bentonite clay is a low-cost adsorbent. This adsorbent was prepared using sulfuric acid reflux and was used for lead removal from wastewater resulting from …
SURFACE ACTIVATION OF FULLER'S EARTH (BENTONITE CLAY) USING ORGANIC ACIDS
Organic acid treatment assures the safety of equipment and safety of the labor as well. Four organic acids are used which are recommended best for activation. These acids are acetic acid, phosphoric acid, citric acid and oxalic acid. Clay is treated with all of these four acids and the acid which generates more active sites in clay is the best ...
Activation of Jordanian Bentonite by Hydrochloric …
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 …