Mn-bentonite

FIGURE 2.19 Color of fresh Mn-bentonite (left) and that of the old Mn-bentonite (right). (Reprinted from Nagy et al. 2004, with permission from Elsevier.)... 

FIGURE 2.20 Thermoanalytical curves of fresh (a) and old (b) Mn-bentonite (x-axis heating temperature, left y-axis of a and b figures temperature change for DTA curve, right y-axis of a and b figure loss of mass in percent for TG curve). (Reprinted from Konya et al. 2005, with permission from Springer.)... 

Fe-Mn oxides Mixed clays (+) Dolomite Oxalates Nontronite Palygorskite Fe-Mn oxides Amphiboles Pyroxenes Pyrite Apatite Protodolomite Protodolomite Dolomite Magnesian silicate Sodium silicate Fluorides Bromides Natron Trona Sulphides Fluorides Palygorskite Sepiolite Nontronite Bentonite Dolomite... 

The same is true of the trichloroacetic acid test (10 ml at 55% per 100 ml of wine). The mixture is heated in a waterbath at 100°C for 2 mn and turbidity is observed after 15 min at room temperature. This test is hardly more effective than the Bentotest if the addition of excessive quantities of bentonite to wine is to be avoided. 

The preference of bentonites for heavy metal ions that adsorb by cation exchange decreases in the order Cu > Pb > Zn > Cd > Mn (Lagaly, 1995). According to Lagaly, the selectivity of montmorillonite for cations generally depends on the restriction of interlayer expansion, being minimal for sodium montmorillonites. Metwally et al. (1993) found palygorskite to be more effective than montmorillonite, and very much more effective than kaolinite, for the uptake of Zn, at least under the conditions of their experiments (pH 4.5-7.0). Minerals were tailored to remove particular elements (e g., radioactive... 

How clays can neutralize the effect of pollution via landuse practices The preference of bentonites for heavy metal ions that adsorb by cation exchange decreases in the order Cu > Pb > Zn > Cd > Mn. How this can be employed in reducing pollution activities ... 

The surface tension of this mixture between modified starch and the suspension with a very high sticky content can be further increased by the addition of bentonite (Aquamont) [72], so that the resulting supernatant is almost free of surface-active substances (surface tension about 70 mN/m). It is also important that the mixing... 

Powdered fillers, also called low-aspect ratio fillers, are mainly of inorganic origin. Patents mention many inorganic powdered fillers [52-54]. They function as inactive fillers and also as reinforcing agents for many plastics, such as polyolefins, polycarbonates, polyformaldehyde, polyamides, PVC, epoxies, and polyesters [55,56]. Most often recommended are feldspar, woUastonite, mullite, asbestos, silicon, silicates, cristobalite, a series of metals, Al, Zn, Pb, Mn, Ba, Ti, Fe, Co, Ni, etc., and their oxides, carbonates, and basic mineral compounds such as spodumene, montmorillonite, kaolin, bentonite, etc. Powdered fillers are added in large quantities, 40-90% by weight of composite. 

Rezaei B, Ghiaci M, Sedaghat ME (2008) A selective modified bentonite-porphyrin carbon paste electrode for determination of Mn(II) by using anodic stripping voltammetry. Sensor ActuatB 131 439-447... 

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