The kinetics data was fitted by using Eq. (4) and the fitting results are also shown in Fig. 2.Smaller value of the separation selectivity index k (16.4) and the worst selectivity were observed for coal-montmorillonite system. Not only flotation recovery but also selectivity for coal-montmorillonite system is lower than that of coal-kaolinite …
Its presence in both raw and purified samples indicated that the applied granulometric treatments (even the method 3) were inappropriate for the separation of kaolinite from montmorillonite. Spectra of the raw bentonites presented two bands at 780 and 802 cm − 1 ( Fig. 7 (a) and (c)), which were characteristic of quartz ( Bosch-Reig et …
the montmorillonite content was increased from 15 to 84% with the separation yield of 80%. The influence of centrifugal force and the type of ultrasonication indicated the most …
Fluoride (F) sorption by acidified montmorillonite, montmorillonite and kaolinite has been investigated as a function of period of agitation, pH, initial fluoride concentration and clay amount. In case of montmorillonite and kaolinite, F sorption is insignificant at pH > 7, while it is maximum at pH 4. Enhanced F sorption by acidified montmorillonite is noted …
The results have shown that kaolinite, montmorillonite and their poly(oxo zirconium) and tetrabutyl-ammonium derivatives could be used as adsorbents for …
Both montmorillonite and kaolinite have negative sites on the basal faces owing to isomorphic substitution and amphoteric sites on the edge faces [16]. The amphoteric sites are conditionally charged and pH dependent because either a net positive or net negative charge can develop due to proton adsorption.
Adsorption capacity (K F) of OP by soil minerals followed the trend kaolinite < montmorillonite < goethite ≪ Gibbsite (Table 1), showing a marked variability between the adsorption capacities of the tested soil minerals. The Fe and especially Al oxides exhibited the highest maximum adsorption capacity for all OP forms.
The covering of aimed minerals by kaolinite and montmorillonite is an important factor leading to poor flotation selectivity. Organic inhibitors with small molecular weights can significantly improve this phenomenon. We selected nine kinds of organic carboxylate inhibitors with small molecules, and the stable adsorption conformations and …
Kaolinite, montmorillonite, and their modified derivatives as adsorbents for removal of Cu (II) from aqueous solution. K. Bhattacharyya, Susmita Gupta. Published …
Tailings are by-products of the separation of economic minerals and consist of gangue particles, chemical reagents, and processing water. While the coarse fraction of tailings settles rapidly, ... Clay minerals are phyllosilicates, including kaolinite, illite, and montmorillonite [12]. They often have great hydrophilicity and high ...
Kaolinite covered much larger area of pyrite surface than montmorillonite owing to the positive charge occurring at the exposed aluminum-oxygen octahedral sheet of kaolinite.
Semantic Scholar extracted view of "High-pressure adsorption of methane on montmorillonite, kaolinite and illite" by Dong Liu et al. ... which imparts to the final solids the highest sorption capacity and the best potential for separation of CO( 2) from gaseous mixtures of CH( 4) and N(2).
Changes in the site density and surface acidity constants (i.e. pKa1 and pKa2) of kaolinite and montmorillonite were determined after acid or alkali spills, and pH buffering capacity was evaluated ...
Thus, a systematic review of published results on the wettability of six different clay minerals (kaolinite, montmorillonite, illite, mica, talc and pyrophyllite) is provided here, spanning from ...
Physical separation techniques like gravity and electrical separation have been widely used to obtain a commercial-grade zircon. ... or 8 wt% high-purity kaolinite or montmorillonite were ...
An oscillator representation for the calculation of van der Waals forces/energies is presented for kaolinite and montmorillonite. The non-retarded Hamaker constants across water (air) are 5.1 (59.2) zJ and 7.3 (75.4) zJ for montmorillonite and kaolinite, respectively.
Kaolinite - also includes dickite and nacrite; ... Montmorillonite The most common smectite is Montmorillinite, with a general chemical formula : (1⁄2Ca,Na)(Al,Mg,Fe) ... also expansible; that is, the separation between individual smectite sheets varies with the amount of water present in the soil. Because of this, they are
It is shown that the van der Waals free energy between two montmorillonite layers of finite thickness, immersed in water, changes from attractive to repulsive at a …
Kaolinite was successfully tested as an adsorbent for the removal of arsenic from two contaminated groundwater samples containing arsenic in the range 1.36–1.41 mg/L and the shift in isoelectric point indicated that adsorption involves inner sphere surface complexation and strong specific ion adsorbed.
The coadsorption of ciprofloxacin (Cip) and Cu(II) on montmorillonite and kaolinite was studied between pH 4.0 and 9.5. At pH < 5.0, Cu2+, Cip+ and [Cu(II)(Cip±)]2+ were the main species in solution. Between pH 5.0−7.0 [Cu(II)(Cip±)]2+ was the dominant complex species. Above pH 8.0 [Cu(II)(Cip−)2]0 precipitated. The …
Adsorption of Co(II) on kaolinite and acid‐activated kaolinite is endothermic driven by entropy increase but the same process follows exothermically on montmorillonite and acid‐activated montmorillonite supported by entropy decrease. In both cases, spontaneous adsorptive accumulation is ensured by favorable Gibbs energy decrease.
separation distance between two approaching surfaces, L. h o. minimum separation distance between two approaching surfaces, L. i. subscript indicating the various materials used in this study. I s. ... who have reported that the attachment of coliphages T7 and T1 is greater onto kaolinite than montmorillonite. Furthermore, it …
The abrupt separation curves for kaolinite produced a peak, as opposed to the gradual separation curve for montmorillonite for maximum adhesion (horizontal dashed line in Fig. 7). As anticipated from Gouy–Chapman theory, the nature and thickness of the diffuse double layer (DDL) surrounding the clay particles control the attraction …
The o/d ratio was the main factor that controlled the fine clogging behavior at pore throats. The critical clogging o/d ratios of Wyoming bentonite, kaolin I, and kaolin II were 2.52, 10.21, and 15.23, …
Na–montmorillonite (Na–Mt) and kaolinite as low-cost adsorbent were performed to remove thallium(I) from aqueous solutions, and their adsorption behavior toward Tl(I) was evaluated. The adsorption of Tl(I) was strongly ionic strength and pH-dependent. Pseudo-first-order and pseudo-second-order models fitted well with the …
DOI: 10.1016/J.CLAY.2021.106189 Corpus ID: 237687946; Selenium isotope fractionation during adsorption onto montmorillonite and kaolinite @article{Xu2021SeleniumIF, title={Selenium isotope fractionation during adsorption onto montmorillonite and kaolinite}, author={Wenpo Xu and Haibo Qin and Jian‐Ming Zhu …
The results showed a gradual separation for montmorillonite in contrast to the relatively abrupt separation of kaolinite. The separation time for montmorillonite was 15 …
The solid lines represent the corresponding K d values predicted by the sorption models for montmorillonite and kaolinite. The montmorillonite desorption K d values are linear across the range of Cs equilibrium concentrations, are the same for each batch desorption period, and correspond well with both the model and experimental …
For a particular separation process, the requirement for choosing membrane materials is complicated and includes longevity, mechanical reliability in operational conditions, efficiency and quality of separation [].Mixed matrix membranes (MMMs) consist of a polymer matrix that has been filled with different inorganic …
Montmorillonite with chemical formula (Na,Ca) 0.3 (Al,Mg) 2 Si 4 O 10 (OH) 2n (H 2 O) is a very soft phyllosilicate group of minerals was first described in 1847 for …
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