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On the basis of fitting the diameter-time curves to get aggregation rate k under different pH and ionic strength (detailed information in SI (Supplementary Information)), with an extrapolation method, the CCC value was determined to be elevated from 6 to 119 mM NaCl for GMZ bentonite colloids as pH increasing from 3.0 to 10.5 (Fig. 7 ...
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The current method of waste disposal is mainly sanitary ... 15, 25, 35, 45, and 55 g/L. The osmotic molar concentrations of bentonite colloids were measured using a German GONOTEC freezing point osmotic pressure meter, Osmomat030 3000. 2.7. ... Ozhan H.O. Determination of Mechanical and Hydraulic Properties of Polyacrylamide-Added Bentonite ...
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Furthermore, as mineral colloids such as bentonite eroded from repository backfill have been shown to facilitate transport in the subsurface (Alonso et al., 2006; Missana et al., 2018Missana et al ...
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Bentonite is widely regarded as the top choice for buffer barrier material in deep geological repositories due to its excellent swelling properties, enabling it to form a tight seal around waste packages when wet, and its strong sorption capacity for dissolved radionuclides [34], [40].However, as groundwater flows through compacted bentonite blocks, small bentonite …
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Determination of bentonite colloid diffusion coefficients in a crystalline rock U. Alonso1, T. Missana 1, A. Patelli2, V. Rigato3, J. Ravagnan3 1 CIEMAT. Madrid SPAIN; 2 Università degli Studi di Padova ITALY;3 INFN-LNL, Padova ITALY ... habitual method [3], conditioning with NaClO4 to a final ionic strength of 10-3 M, pH 7.52 and a ...
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The vast majority of the bentonite colloids were in nominal size fractions >200 nm. For the 3k Da–200 nm fraction, the ratio of Al:Mg (0.62:1, with Al = 0.065 ppm and Mg = 0.105 ppm) was far from that of the bentonite theoretical value (5.02:1), and so this fraction does not seem to contain significant quantities of bentonite colloids.
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Rheological study of organoclays prepared from Indian bentonite: Effect of dispersing methods ... ELMA) was 10 min (optimized from 10, 20 and 30 min studied) for each test. 2.5. Determination of rheological properties Rheological properties, viz. viscosity and gel volume (also known as sediment volume) were measured on the toluene ...
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The titration curves of the bentonite colloids showed a typical titration shape of montmorillonite clay, while a common intersection at the point of zero charge (PZC) around 9.5 and a slightly ...
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The results demonstrate that when the drop strength of the green ball reaches its optimal level, the five commonly used indicators of bentonite are as follows: water absorption is 545.27% ...
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A t /A 0 evolution with time under different K-nZVI dosage: (a) 0 % Bentonite；(b) 1 % Bentonite； (c) 3 % Bentonite； (d) 5 % Bentonite；(e) 7 % Bentonite. The law as shown in Fig. 2 is that the relative absorbance of suspension decreased first and then stabilized with time, which was particularly obvious at low bentonite content, but ...
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For this reason, the purpose of this research is to: (1) measure the surface charge properties of bentonite using an extended combined determination method, (2) clarify the evolution principle of surface properties at different pH conditions, and (3) analyze and explain the response mechanism of bentonite surface charge properties to pH variation.
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How to measure rheological properties of bentonite suspensions on construction sites. Yield point measurements were performed on bentonite suspensions. A rheometer and measuring …
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Bentonite found in a drill core of Tsunagi Mine, Niigata, Japan was evaluated by the new method to demonstrate the substantial increase in smectite content from 40% in the …
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Once bentonite colloids are aggregated, a decrease in ionic strength facilitates disaggregation, but the process is not fully reversible as the initial size of the stable bentonite colloids at low ...
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The bentonite used in this study was a white powder that was provided by Shouguang Montmorillonite Group Co., Ltd, China. ... J. Colloid Interface Sci. (2015) Standard test method for laboratory determination of water (moisture) content of soil and rock by mass, Standard D2216-10 ... (1970) Bascomb C. Rapid method for the determination of ...
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The adsorption behaviors of U(VI) on bentonite colloids (BC) were investigated using batch experiments. The kinetic evaluation suggests that pseudo-second-order model can describe U(VI) sorption well. Furthermore, solution chemistry plays a significant role in sorption nature of U(VI) on BC. The U(VI) adsorption increases at pH = 2.0–5.0, while gradually …
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The size and shape of colloids released from a natural bentonite into a low-mineralized groundwater are investigated using various colloid characterization methods. For the applied methods such as atomic force microscopy (AFM), laser-induced breakdown detection (UBD), photon correlation spectroscopy …
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3 51 efficient sodium modification of bentonite has long been a challenging issue for researchers in this field. 52 In addition to exploring various methods and processes for sodium modification ...
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In this work, the aggregation, retention, and release of bentonite colloid in saturated porous sand media were investigated by kinetic aggregation and column experiments, the …
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The bentonite in this work was sourced from Gaomiaozi region (Inner Mongolia, China), and converted into Na-GMZ bentonite. The purification and conversion procedures for bentonite were described in previous work (Pan et al., 2011).Briefly, bentonite was dispersed in 0.5 M NaCl solution (solid-to-liquid ratio 40 g·L −1) and treated with ultrasonic wave for half an …
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The method was evaluated using four different experimental systems of increasing complexity. Short pulses (equivalent to 0.002 ... DETERMINATION OF COLLOID DEPOSITION RATES 1131 (6) • WASTE DETECTOR (5) COLUMN (2) (4) DEGASSER INJECTION LOOP Figure 1. Schematic drawing of the experimental setup used
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Along with the alteration in colloidal sizes, the adsorption of HA onto colloidal surfaces could change the zeta potential of colloids, which then would alter the interaction force between ...
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The interaction of Cs(I), Eu(III), Th(IV) and U(VI) with montmorillonite colloids was investigated in natural Grimsel Test Site groundwater over a 3 years period. The asymmetric flow field-flow fractionation combined with various detectors was applied to study size variations of colloids and to monitor colloid association of trace metals. The colloids suspended directly in …
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Colloid facilitated transport was shown to be faster than the transport of dissolved species. The migration behaviour of the tri- and tetravalent actinides Am and Pu was strongly mediated by the bentonite colloids and recovery increased from 20 to 30% in the absence of bentonite colloids, to about 60–80% in the presence of bentonite colloids.
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and bentonite, the dose of bentonite was fixed (10–20–30– 40 mg/L) in each test with a variation of the dose of alumi-num sulfate coagulant from 10 to 120 mg/L. In the section of adding chitosan and bentonite, the chitosan dose was fixed each trial (10–20–40 mg/L) and the bentonite dose was increased (250–500–750 mg/L).
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We analyzed first the transport behaviour of bentonite colloids alone at different flow rates; then we compared the transport behaviour of strontium as solute and of strontium previously adsorbed ...
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for stable bentonite colloidal suspensions. In this work, three ChCl based natural deep eutectic solvent NADES were synthesized by mixing choline chloride as the hydrogen bond acceptor (HBA) with ...
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The size and shape of colloids released from a natural bentonite into a low-mineralized groundwater are investigated using various colloid characterization methods.
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The particle size and zeta potential of bentonite colloids were determined by dynamic light scattering (DLS, Malvern Nano Zeta Sizer). Using this method, bentonite colloids were successfully prepared with a zeta potential of −39.5 mV and a size of 360 nm (Fig. S2). 2.2. Column experiments
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Bentonite colloids are recognized as the predominant type of colloids in nuclear waste repositories environments. They have a unique flaky structure and good expansion ability (Garcı́a-Gutiérrez et al., 2001; Samper et al., 2006).Norrfors et al. (2016) have discovered that bentonite colloids have a permanent negative charge and strong cation sorption properties due …
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The structural negative charges deriving from isomorphous substitution in bentonite layers facilitate the association of positively charged radionuclides with bentonite colloids, therefore ...
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fast method of the active bentonite (montmorillonite) estimation in moulding sands. In order to do that, the spectrophotometric determination method, which is ap-plying triethylenetetramine co. …
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Stable bentonite colloid dispersions for calibration (in 5 · 10−4 M NaClO4), with a mean size of 250–300 nm, were prepared in the laboratory. The stability of these dispersions was often checked to guarantee the precision of PCS analyses. The PCS's detection limits for bentonite colloid is approximately 1 mg/L.
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Research on determination of value CEC (Cation Exchange Capacity) Bentonite North Aceh and Bener Meriah with three methods has been studied. The purpose of this study was to determine the value of ...
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It is obvious that colloid particle size can be reduced by sedimentation or centrifuge methods. Bentonite colloids showed polydiperse and wide particle size ... García-García, S., Wold, S. and Jonsson, M., 2007, Kinetic determination of critical coagulation concentrations for sodium- and calcium-montmorillonite colloids in NaCl and CaCl2 ...
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The objective of the BELBaR Work Package 2 is to understand the mechanisms of colloid and gel layer formation during bentonite erosion. A special focus was set on the characterization of the …
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