In this paper, a gel adsorption material (CS@OB) was prepared by compounded oxalic acid modified bentonite with chitosan, which was used to remove Cr⁶⁺ from aqueous solution. Batch adsorption ...
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From the above discussion if four of these organo-clays are considered the best orano-clay which is suitable for the treatment of bleaching process in vegetable oil industry in Pakistan is Oxalic acid. Oxalic acid treated clay analysis shows that bleaching power of oxalic acid is effective enough that it can purify the used vegetable oil and ...
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Production and application of a treated bentonite–chitosan ... Dec 01, 2018· Initially, 0.5 g chitosan was added into a beaker containing oxalic acid solution in volume fraction, 2% under continuous stirring for 2 h, followed by the addition of 25 g of modified bentonite.The mixture was then shaken for 6 h and was latter precipitated using NaOH.The preparation method of TBCH …
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Oxalic acid is among the most abundant organic acids found in different biospheres, including plants, as an end product of metabolism. It forms either soluble or insoluble salts with monovalent or divalent cations, respectively. Then, consumption of oxalic acid-rich foods in human diets, particularly leafy vegetables (e.g., spinach, tea, and rhubarb), affects minerals …
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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 bleaching earths. In particular, two different bentonite samples (one containing aluminum and one containing ferruginous smectite), after being …
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Bone meal (BM) is a cost-effective and low-carbon material to remediate heavy metal contaminated soils. Moreover, its immobilization efficiency for heavy metals still requires improvement. This study aimed to assess the activation effect of oxalic acid on the BM to develop an oxalic acid-activated bone meal (ABM) for improving immobilization efficiency. Several …
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A bentonite from Milos, Greece, was activated with oxalic acid and the effect of acid activation conditions on bleaching of sunflower oil was investigated. The activation …
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The WO3/TiO2 nanocomposites were successfully prepared via a facile oxalic acid assisted hydrothermal process. The oxalic acid played a vital role on the preparation of WO3/TiO2 nanocomposites. Notably, it has been observed that the nanocomposites exhibited the wider absorption edge, and the higher photocatalytic activity, compared with pure TiO2. In addition, …
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Oxalic acid concentration of 0.5 M is sufficient for achieving this result. The materials produced through the oxalic acid activation are also compared with inorganic acid-activated smectites originating from the same deposits. ... The effect of oxalic acid activation on the bleaching properties of a bentonite from Milos Island, Greece. Clay ...
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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 bleaching earths.
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When oxalic acid dosage exceeded 0.06 g L −1, the decolorization rate of would gradually decrease. These results may be caused by two reasons. First, excessive H 2 C 2 O 4 existing reaction system can capture a certain number of hydroxyl radicals and lead to decreasing decolorization rate of .
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Oxalic acid dihydrate (OAD) which has very high initial phase transition enthalpy is a promising phase change material (PCM). In this paper, shape-stabilized composite PCMs …
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Download scientific diagram | FTIR spectra of (a) CTAB, (b) oxalic acid, (c) chitosan, (d) sodium bentonite, (e) CTAB bentonite and (f) TSOBC. from publication: Adsorption of Cr(VI) ions from ...
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THE EFFECT OF ACID, OXAL ATE ION, AND MANGANIC ION ON THE REACTION RATE A comparison of curves (2) • and (3), Fig. II, shovvs the effect of acid on the rate. It is to be noted, however, t hat t he concentration of oxalate ion is inversely p1~oportional to the con centration of hydrogen ion, since oxalic acid is weak.
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Abstract A bentonite from Milos, Greece, was activated with oxalic acid and the effect of acid activation conditions on bleaching of sunflower oil was investigated. The activation parameters studied were temperature, retention time and oxalic acid to bentonite mass ratio. The activated materials produced had good bleaching properties and were suitable for industrial …
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Leachate, consisting of organic acids such as acetic acid (AA) and oxalic acid (OA), commonly is released into groundwater from municipal solid waste dumps and uncontrolled landfills. Slurry trench cutoff walls commonly are used to contain such contaminated groundwater, thereby protect the surrounding public and the environment.
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investigate the diffusion behavior of 125I in bentonite in present of organic matter, such as polyaminopolycarboxy-late EDTA, oxalic acid, hydrazine and humic acid HA. The effective diffusion coefficient D e value and rock capacity factor a were (2.32.6) 9 10-11 m2/s and 0.040–0.052, respectively. The small difference showed that iodine was
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Bentonite is added into the chitosan-CH 3 COOH solution at pH 4. The mixture was stirred for 2 h. ... The process involves the preparation of chitosan gel using 10 wt% oxalic acid at 50 °C. The charcoal is slowly added to the gel solution, and the mixture is agitated for 24 h to form beads. The process is repeated thrice to form a thick ...
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Download Citation | On Sep 1, 2014, Mingming Kong and others published Effects of oxalic and citric acids on three clay minerals after incubation | Find, read and cite all the research you need on ...
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Optimum bleaching properties could be achieved using a variety of combinations of acid to bentonite ratios and activation times. Bleaching efficiency tests indicated that 24 h …
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Oxalic acid dihydrate (OAD) which has very high initial phase transition enthalpy is a promising phase change material (PCM). In this paper, shape-stabilized composite PCMs composed of OAD and bentonite were prepared by a facile blending method to overcome the problem of leakage.
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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 recommended acid for activation. ... (BENTONITE CLAY) USING ORGANIC ACIDS}, author={Atif Alam Khan and Syed Hassan and Javed Naqvi and Mohsin Ali Kazmi and ...
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AbstractLeachate, consisting of organic acids such as acetic acid (AA) and oxalic acid (OA), commonly is released into groundwater from municipal solid waste dumps and uncontrolled landfills. Slurry trench cutoff walls commonly are used to contain such ...
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In this investigation, oxalic acid dihydrate (purity 99.5%) and bentonite were purchased from Aladdin Chemistry Co. Ltd (China). Deionized water was prepared in the laboratory.
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Oxalic acid is a reducing agent, and its conjugate base is oxalate. (C 2 O 4) 2-Oxalate functions as a chelating agent for metal cations. Typically, oxalic acid occurs in the form of a dihydrate with the formula H 2 C 2 O 4.2H 2 O. The ingestion of oxalic acid, whether by skin contact or orally, is lethal.
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The oxalic acid pretreated modified bentonite clay adsorbent with the highest ECs removal during adsorption, tag as APMB, was also characterized to the if the ECs adsorption have effect on the crystal structure of the adsorbent. Fig. 4 present the XRD pattern of oxalic acid pretreated modified bentonite adsorbent after adsorption (APMB).
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Keywords Cr6+ · Oxalic acid · Chitosan · Bentonite · Modication 1 Introduction Chromium (Cr) is a common heavy metal element, which is widely used in steel fabrication, electroplating, leather tanning, the textile industry, and so on. In nature, Cr mainly exists in …
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Taxiarchou and Douni (2014) activated a bentonite from Milos, Greece, with oxalic acid and investigated the effect of acid activation conditions on the bleaching of sunflower oil. The activated materials had excellent bleaching properties and were suitable for industrial use as bleaching earths.
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In this paper, a gel adsorption material (CS@OB) was prepared by compounded oxalic acid modified bentonite with chitosan, which was used to remove Cr6+ from aqueous …
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The activation parameters studied were temperature, retention time and oxalic acid to bentonite mass ratio. The activated materials produced had good bleaching properties and …
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Maximum adsorbed amounts of 23.63 mg/g and 34.66 mg/g, were achieved for the adsorption of oxalic acid on, respectively, bentonite activated carbon particles. Thermodynamic parameters were ...
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The acid activation of bentonite clay (at 1M concentration) was carried out using four different organic acids namely: propanoic acid (pka=4.88), lactic acid (pka=3.86), citric acid...
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Bentonite was activated with three different acids by adding 8 g of bentonite in 50 ml of 1 M solution of each acid i.e. Phosphoric acid, Acetic acid, Citric acid and Oxalic acid. Solutions were allowed to agitate in an orbital shaker at 60 °C for 24 h.
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Activation of Bentonite clay using hydrochloric acid (HCl) [15], [16], sulfuric acid (H 2 SO 4) [17], [18] and other acids [19], [20] has been reported. Out of all acids, H 2 SO 4 is preferred mostly as the activation can be performed by mild process conditions and the quality of the end product is better with high specific surface area and ...
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Fu et al. (2023a) investigated the k of SB backfills under the influence of AA and oxalic acid solutions. ... (MSB), and amended backfill with polyacrylic acid amended sodium bentonite (BPNSB). The range of porosity values for the backfills, concentrations of testing liquids, and effective confining stresses applied in flexible-wall hydraulic ...
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Taxiarchou and Douni (2014) activated a bentonite from Milos, Greece, with oxalic acid and investigated the effect of acid activation conditions on the bleaching of sunflower oil. The activated ...
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Leachate, consisting of organic acids such as acetic acid (AA) and oxalic acid (OA), commonly is released into groundwater from municipal solid waste dumps and uncontrolled landfills.
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Taxiarchou and Douni (2014) activated a bentonite from Milos, Greece, with oxalic acid and investigated the effect of acid activation conditions on the bleaching of sunflower oil. …
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The FeBe-I bentonite treated at 1 M oxalic acid presented maximum decolourization, which is associated with its high porosity. Moreover, low chlorophyll value and low colour were concurrently achieved by using the AlBe-G bentonite treated with 1 M oxalic acid as a bleaching earth. Author Contributions: Supervision, M.T.; conceptualization, I.D ...
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