Effects of pH, ionic strength and humic acid on the sorption …
The surface complexation model (SCM) suggests that sorption of Np(V) on Na-bentonite was mainly dominated by ion exchange at low pH values, and two dominant monodentate inner-sphere complexes of ≡ SiONpO 2 0 (logK = − 4.55) and ≡ AlO(NpO 2 OH) − (logK = − 13.80) contributed to Np(V) sorption on Na-bentonite over high pH range.
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A novel layer-layer crossed structure of bentonite/g-C3N4 …
With the increase of bentonite content from 5% to 10%, the oxidation efficiency of As(III) increased from 76% to , but decreased to 77% when bentonite content increased to 20%, which indicated that the composite of bentonite promoted the arsenic oxidation just in a certain range (below 10%). Because bentonite itself cannot …
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Novel Enzyme-Free Multifunctional Bentonite…
Precise designs of low-cost and efficient catalysts for the detection of hydrogen peroxide (H2O2) over wide ranges of pH are important in various environmental applications. Herein, a versatile and ecofriendly approach is presented for the rational
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The API standard test and analysis values of …
A development which shows that the activated bentonitic clays' pH values were within the API bentonite pH value range as indicated in Table 1 ...
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SODIUM BICARBONATE
SODIUM BICARBONATE is used to lower the pH of drilling fluid slurries from a pH of 12 – 13 (alkaline) to a neutral pH range of 8 – 9. SODIUM BICARBONATE can be added to a base drilling fluid as a pH neutralizing additive. SODIUM BICARBONATE is also used as a buffer when added to acidic water to raise the pH to 8 – 9.
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IS 6186 (1986): Bentonite
0.2 Bentonite, a characteristic type of fine grained clay, is an alteration product of volcanic ash containing not less than 85 percent of the clay ... pH iii) Gel formation index iv) Swelling power f3 5*0-12.0 9.0-10.5 To pass test To pass High (4 12.0, nmx fti) A-2 - TO pm test - - To pass test - A-3 A-4 A-5 v) Fineness: a) Dry: ...
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THE pH OF AQUEOUS BENTONITE SUSPENSIONS
The typical pH of Ca-bentonite suspensions ranges from 7 to 8 in contrast to Na-bentonites with pH values ranging from 9 to 10. This trend is valid regardless of the carbonate …
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Novel Enzyme-Free Multifunctional Bentonite…
Precise designs of low-cost and efficient catalysts for the detection of hydrogen peroxide (H 2 O 2) over wide ranges of pH are important in various environmental applications.Herein, a versatile and ecofriendly approach is presented for the rational design of ternary bentonite-silylpropyl-polypyrrole/silver nanoarchitectures (denoted as BP-PS …
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A surface chemical model of the bentonite-water …
In contact with Allard groundwater, the pH values of the porewater in compacted bentonite range from pH = 7.1 - 8.4 depending on the stage of conversion of Na-bentonite to Ca-bentonite. The corresponding pH range for Äspö groundwater is pH = 6.0 - 6.5. The transformation of Na-bentonite to Ca-bentonite strongly depends on the amount of calcite
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pH dependence of bentonite aggregate size and morphology …
A change in performance with pH is observed, however, over a wider range of pH values, as shown in Fig. 3 B. The bentonite solutions at pH of 3.4, 5, 6.6 and 7 have the same zeta potential yet pH 3.4 has different …
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Effects of bentonite concentration and solution pH on the …
The influences of bentonite concentration and solution pH on the rheological properties and long-term stabilities of bentonite suspensions were studied in this research. Rheological properties were measured at bentonite concentrations of 5, 7, and 9 wt.%. It was found that the viscosity and shear stress increased with increasing …
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Effect of pH on Rheological and Filtration …
It is recommended from the results to keep the pH of water-based drilling fluid based on bentonite in the range of 9 to 10 as it provides the optimum mud rheological and filtration properties.
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THE pH OF AQUEOUS BENTONITE SUSPENSIONS
the pH. However, Figure 4 clearly proves that the pH of non-calcareous bentonite suspensions increases with increasing exchangeable Na+. The typical pH of Ca-bentonite suspensions ranges from 7 to 8 in contrast to Na-bentonites with pH values ranging from 9 to 10. This trend is valid regardless of the carbonate concentration.
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The pH of aqueous bentonite suspensions | Clays and Clay …
The pH of aqueous bentonite suspensions is known to be influenced by carbonates present even in minor amounts. On the other hand, at high solid:liquid ratios …
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Effects of bentonite concentration and solution pH on the …
The influences of bentonite concentration and solution pH on the rheological properties and long-term stabilities of bentonite suspensions were studied in this …
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THE pH OF AQUEOUS BENTONITE SUSPENSIONS
The pH of aqueous bentonite suspensions is known to be influenced by carbonates present even in minor amounts. On the other hand, at high solid:liquid ratios (at standard pH measurement conditions: 2% w/w suspension), the type of exchangeable cation in the smectite is also known to determine pH (particularly Na + or Ca 2+).By …
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Effect of pH on Rheological and Filtration Properties of …
Figure 6 shows the changes in the YP/PV ratio over a wide range of pH for the bentonite-based mud. The highest value of YP/PV is 1.4 for pH of 8 and the ratio was 1.0 for pH values of [9,10] and it decreased to 0.5 for pH of 11 and 12. The results for YP/PV ratios show that for increasing pH values, there is a decreasing in the ratio of …
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High Purity Bentonite Clay Powder Fits Wide pH Range
Zhejiang Yuhong New Materials Co.,Ltd. Tel: +86-572-5800000. Mob: +86. Email: ywx03@chinabentonite Add: TianZihu Town, Anji County, Zhejiang Province ...
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Catalytic oxidation of polymer used in oilfield by bentonite …
Catalytic oxidation of polymer used in oilfield by bentonite supported Cu(II) complexes in a wide pH range Liwa Ma, a [email protected] Yuying Xue, a [email protected] Weichao Du, a [email protected] Jie Zhang, a b [email protected] Chengtun Qu, a b * [email protected] Gang Chen, a b * [email protected] a Shaanxi Province Key Laboratory of ...
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The colloidal and rheological properties of bentonite suspensions
Callaghan and Ottewill [38] found that the electrophoretic mobility of Na +-montmorillonite particles is constant in the pH range (pH 3–11), as did Rioche and Siffert [49] for pH values between 7 and 11. Their results support the existence of a strong pH-independent negative charge on the clay surface, and a much weaker positively charged ...
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Sorption of Th(IV) on Na-bentonite: Effects of pH, ionic …
At pH < 3.0, only small removal of Th(IV) (∼25%) from solution to Na-bentonite surface occurs, then the sorption percentage sharply increases in the pH range of 3–4, finally maintains a high level above pH ∼ 4.0.
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Effect of pH and electrolyte on the rheology of aqueous …
The influence of pH between 7.5 and 10.5, for 5% and 6.42% aqueous Wyoming bentonite dispersions and of NaCl for 2%, 5% and 6.42% of Wyoming-bentonite in water for a range of salt concentrations up to 1.0 M has been investigated.
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Sorption of Lithium on Bentonite, Kaolin and Zeolite
They considered a pH range of 6 to 10 and determined the point of zero charge, i.e., the pH at which positive charge equals negative charge, of bentonite being saturated with H+ as 8.2. As opposed to other clay minerals, kaolin is stable at low pH [20,21].
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Bentonite | Properties, Formation, Uses » Geology Science
Bentonite is an important material in various fields due to its unique properties and characteristics. Here are some of the key uses and benefits of bentonite: 1. Drilling industry: Bentonite is widely used as a drilling mud in the oil and gas industry. It helps to lubricate and cool the drill bit, as well as …
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Degradation of hydroxypropyl guar gum at wide pH range …
In this paper, five bentonite-supported zero-valent metal catalysts were prepared for catalytic degradation of HPGG solution so as to achieve the purpose of polymer wastewater treatment at wide pH range. The results showed that the bentonite-supported zero-valent copper exhibited high catalytic performance reflected by a large …
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Effect of pH on Rheological and Filtration
Figure 6 shows the changes in the YP/PV ratio over a wide range of pH for the bentonite-based mud. The highest value of YP/PV is 1.4 for pH of 8 and the ratio was 1.0 for pH values of [9,10] and it decreased to 0.5 for pH of 11 and 12. The results for YP/PV ratios show that for increasing pH values, there is a decreasing in the ratio of YP/PV ...
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THE pH OF AQUEOUS BENTONITE SUSPENSIONS
The pH of aqueous bentonite suspensions is known to be influenced by carbonates present even in minor amounts. On the other hand, at high solid:liquid ratios …
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Building the bridge between U(VI) and Ca-bentonite
Only recently, Brix et al. (2021) described an increased U(VI) retention on Ca-bentonite in the presence of Ca2+ at pH 12.5 and 13 and proposed a bridging effect of Ca. The results of Philipp et al. (2019) and of the present study also strongly suggest such Ca-mediated surface complexes, even over a wider alkaline pH range.
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Building the bridge between U(VI) and Ca-bentonite
The speciation and binding mechanisms of U(VI) on clay or bentonite (or its main component montmorillonite) are well investigated in acidic, neutral and slightly alkaline background electrolytes but studies in the hyperalkaline pH range (>10) are rare (Kautenburger et al., 2019; Philipp et al., 2019).
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Cation exchange capacity of bentonite in a saline …
Salt admixture in bentonite after exposition influences CEC measurement. ... In this pH range, Cu-trien exists as [Cu(trien)] 2+ with an absorption maximum at λ = 575 nm (Delavernhe et al., 2018). With increasing NaCl concentration, there is a slight shift of the absorption maxima to higher wavelengths (Fig. 3).
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Magnetized bentonite modified rice straw biochar: …
Research has shown bentonite to play a catalytic function during the pyrolysis process of the biochar surface, contributing to increased yield, elevated pH and enhanced functional group enrichment (Ramola et al., 2020).Bentonite, which is mainly composed of silicates, is a 2:1 clay mineral that can adsorb metals by intercalation ion exchange.
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Combined determination analysis of surface properties evolution …
Other parameters, in addition to surface potential, can be used to characterize the surface electrochemical properties of bentonite as pH changes in a moderate range. Fig. 3 shows the measured surface electric field strength, specific surface area, and surface charge numbers at various pH levels. In a moderate pH range, the surface electric ...
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Colloidal stability of bentonite clay considering surface …
At the higher ionic strength of 0.1 M NaClO 4, the zeta potentials were increased and their values were around zero for the whole pH range. Thus, it can be concluded that the bentonite colloids are stable at the lower ionic strengths of 0.01 and 0.001 M NaClO 4 but unstable at the higher ionic strength of 0.1 M NaClO 4 for the …
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A novel layer-layer crossed structure of bentonite/g-C
In this work, a novel 2-dimentional (2D)-2D bentonite/g-C 3 N 4 composite (B/g-C 3 N 4), with a layer-layer cross structure and large surface area, was synthesized by a self-assembly process, with the aim for the photocatalytic oxidation of arsenic (As(III)) in wastewater. The structure and properties of the mineral-based composite were …
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Uranium sorption on bentonite modified by
ODTMA-bentonite is characterized by large sorption affinity for U(VI) in a wide pH range, i.e. from pH 6 to 10, when compared with sodium bentonite, where the effective sorption is limited merely to 5–7 pH range. This is a result of the anionic complexes sorption; among them the sorption of (UO 2) 3 (OH) 7 − is the most probable.
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Effect of alkaline solutions on bentonite properties
For example, Heikola et al. (2013) showed that only small changes in the mineralogy of bentonite for a given test duration (~18 months) occurred at pH < 12, …
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The pH of aqueous bentonite suspensions | Clays and Clay …
The pH of aqueous bentonite suspensions is known to be influenced by carbonates present even in minor amounts. On the other hand, at high solid:liquid ratios (at standard pH measurement conditions: 2% w/w suspension), the type of exchangeable cation in the smectite is also known to determine pH (particularly Na + or Ca 2+).By …
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