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THE ANTIBACTERIAL PROPERTIES OF MODIFIED BENTONITE DEPOSIT TAM BO

In this article, the antibacterial properties enriched bentonite Tam Bo deposit, Lam Dong Province (Vietnam) modified in various ways: alkali - by processing enriched bentonite LiOH solution at a temperature of 60°C for 30 min, brine - by processing enriched bentonite, 3% solution of Na2CO3 at 55°C for 30 min, and nanoparticles of silver - silver nanoparticles by immobilizing on the surface of the bentonite by precipitation of silver nanoparticles AgNO3 solution. Initially, the bentonite clay deposits Tam Bo contains 40 - 60 wt% of active sorption-montmorillonite. Enrichment, followed by modifying the content of montmorillonite can increase up to 70 - 80 wt. %. The modification allows the bentonite increase in its physical-chemical and colloid-chemical characteristics to 2 – 3 times, such as degree of swelling, the specific surface area, cation exchange capacity. The experimental data showed that the bentonite modified with silver nanoparticles can effectively inhibit the growth of opportunistic pathogens like Enterococcus feacalis, Escherichia coli, Proteus mirabilis, Pseudomonas aerugenosa, Salmonella typhimurium, Staphylococcus aureus and Candida albicans. Modification of bentonite clay and montmorillonite crystal lattice is included in its composition with silver nanoparticles allows increasing the bactericidal activity against aflatoxin to 65 times.

Figures

Table 1.  Chemical composition of the oxide samples of clay from Tam Bo deposit.

Table 2. Mineralogical composition clay samples from Tam Bo deposits.

Figure 1A. The distribution of particles in a sample of montmorillonite clay   VT 6 from Tam Bo deposit (S - montmorillonite individual crystals; A - montmorillonite aggregates of crystals).

Figure 1B. The distribution of particles in a sample of montmorillonite clay   VT 6 from Tam Bo deposit (S - montmorillonite individual crystals; A - montmorillonite aggregates of crystals).

Figure 2A. Deposits crystals in a sample of montmorillonite clay VT 6 from Tam Bo deposit (F - crack unstable forms, T - twisted into a tubes edge crystal montmorillonite).

 Figure 2B. Deposits crystals in a sample of montmorillonite clay VT 6 from Tam Bo deposit (F - crack unstable forms, T - twisted into a tubes edge crystal montmorillonite).

Figure 3A. Montmorillonite (M) of sample clay VT 6 from Tam Bo deposit, T- twisted into a tubes edge of montmorillonite crystal.

Figure 3B. Montmorillonite (M) of sample clay VT 6 from Tam Bo deposit, T- twisted into a tubes edge of montmorillonite crystal. 

Figure 4. Electron micrograph of a low-temperature trigonal quartz (Q) from a sample of clay VT 6 from Tam Bo deposit.

Figure 5A. Kaolin (K) from the sample of clay VT 6 from Tam Bo deposit.

Figure 5B. Kaolin (K) from the sample of clay VT 6 from Tam Bo deposit. 

Figure 6. Dependence of concentration changes of the ions Pb2+ and Cd2+ on the adsorption on the duration of the original bentonite clay samples VT6 (A) and rich bentonite clay samples VT6 (B).

Table 3. Adsorption of ions Pb2 + and Cd2 + on experimental samples.

Table 4. The sorption capacity Tam Bo clay deposits in relation to conditionally pathogenic microorganisms.

Table 5. Relationship of microorganisms washings concentration (Cfu / ml) on the presence of the ingredients in the composition and quantitative content of sorbent.

Figure 7. Effect of fungal growth inhibition sorbent Ag (VT 6) depending on the weight ratio of Ag / Bent.

Table 6. Efficacy AfB1 adsorption on a sample of bentonite clay in water at AfB1, initial concentration 59 mg/l.

DOI: 10.18413/2500-235X -2016-2-3-63-74
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