Is it possible to efficiently and sustainably remove microplastics from sediments using froth flotation?

The role of sodium tripolyphosphate in wet grinding process of magnesite

The Role of Sodium Tripolyphosphate in Wet Grinding Process of Magnesite

Sediment organic carbon dominates the heteroaggregation of suspended sediment and nanoplastics in natural and surfactant-polluted aquatic environments.

Molecular force plays an important role in the interaction between collector and minerals, which directly reflects the intrinsic reason for the selectivity and collection of the collector to minerals. In this work, the interaction forces between sodium oleate (NaOL) and minerals (kaolinite and diaspore) were directly characterized by atomic force microscopy (AFM) combined with EDLVO theory. The results show that after interacting with NaOL, the zeta potentials of kaolinite and diaspore were more negative, and the hydrophobicity of minerals increased. EDLVO calculation results indicate that electrostatic repulsion dominated the interaction forces between mineral particles, and the van der Waals interaction energy, electrostatic interaction energy, and hydrophobic interaction energy increased after NaOL treatment. AFM measurements show that the NaOL collector increased the attraction force of diaspore-diaspore and kaolinite-kaolinite particles, and the increase in attraction force for diaspore-diaspore particles was larger than in kaolinite particles, which was consistent with the EDLVO results. The adhesion force between the NaOL collector and the diaspore surface was larger than in kaolinite, confirming the fact that NaOL had better collection and selectivity for diaspore than kaolinite. This work improves understanding of the interaction mechanisms between NaOL collector, diaspore, and kaolinite minerals. 

/pdf/interaction-forces-between-diaspore-and-kaolinite-in-naol-36tzhp7t.pdf

Interaction Forces between Diaspore and Kaolinite in NaOL Solution Probed by EDLVO Theory and AFM Analysis

Clay minerals are the main reason why coal slime water is difficult to settle. For the exploration of the influence of Ca2+ on the sedimentation effect of illite, the adsorption characteristics of illite were investigated under different Ca2+ concentrations. After adsorption equilibrium, the sedimentation test was carried out, and the changes in the surface properties of illite particles were analyzed by measuring Zeta potential and contact angle. The Theory of EDLVO was adopted to calculate the interaction energy between illite particles. The results showed that with the increase of Ca2+ concentration, the equilibrium adsorption capacity of illite increased, and the adsorption equilibrium was basically achieved at 60 min. The adsorption process was in accordance with the quasi-second-order kinetic model and Langmuir isothermal adsorption model. The sedimentation effect of illite was obviously improved after adsorption of Ca2+. When the concentration of Ca2+ was 10 mmol/L and pH = 8, the sedimentation rate was 92.5%. With the increase of Ca2+ concentration, the absolute value of the Zeta potential of illite after adsorption equilibrium decreased continuously, and the contact angle increased continuously. According to the Theory of EDLVO, the polar force is the dominant force affecting the interaction between particles. As the concentration of Ca2+ increases, the van der Waals attraction force between illite particles increases, the electrostatic and polar repulsive forces weaken, and the total interaction energy gradually decreases, indicating that Ca2+ can promote the agglomeration of illite particles, which is of benefit to the clarification of coal slime water.

A study on the mechanism of calcium ion in promoting the sedimentation of illite particles

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A study on the mechanism of calcium ion in promoting the sedimentation of illite particles