Influence of Basic Red 1 dye adsorption on thermal stability of Na-clinoptilolite and Na-bentonite

Abstract

Influence of physically adsorbed basic red 1 (BR1) dye on the physicochemical properties of natural zeolite (clinoptilolite) and clay (bentonite) was compared using adsorption, FTIR, and TG/DTA methods. A larger adsorption of the dye was observed for bentonite (0.143 mmol/g) than for clinoptilolite (0.0614 mmol/g) per gram of an adsorbent. However, the adsorption values are the same per surface unit (1.8 lmol/m 2 ). The result (per gram) is due to location of dye molecules in interlayer and interparticle space of bentonite with much larger specific surface area than that of clinoptilolite. The dye adsorption leads to a decrease in the specific surface area and the pore volume of both minerals. The adsorption changes also a character of active sites and thermal stability. A TG study shows that the dye adsorption on bentonite changes adsorbed water amounts, weight loss, and decomposition temperature. In the case of zeolite, the dye adsorption insignificantly influences the thermal stability. The dehydration energy distributions calculated from the Q-TG and Q-DTG data demonstrate a complex mechanism of water thermodesorption and the influence of adsorbed dye on this process.

A thermal, sorptive and spectral study of HDTMA-bentonite loaded with uranyl phosphate

“…The first peak representing a mass loss of 0.79%, with a minimum at about 83°C, is due to the removal of adsorbed and interlayer water [21]. In the second stage (400-750°C, a minimum at 672.7°C), the mass loss of 4.4% corresponds to dehydroxylation of the clay [30][31][32][33]. TG, DSC and DTG curves of bentonite samples for three different HDTMA-Br concentrations (used for loading the sorbent phase) are given in Figs.…”

Influence of the Synthesis Method on the Structural Characteristics of Novel Hybrid Adsorbents Based on Bentonite

“…The application areas of bentonites vary depending on the amounts of their constituents. They can be used as selective adsorbents [4] of dyes [5] and herbicides [6], as well as catalysts [7]. The use of bentonite as reinforcing and viscosity modifiers in polymer composites and drilling fluids was described in detail [8,9].…”

Adsorption Properties of Bentonite with In Situ Immobilized Polyaniline Towards Anionic Forms of Cr(VI), Mo(VI), W(VI), V(V)

“…Also, from Fig. 4 it can be concluded that the immobilization occurs at the location of polyaniline molecules in both interlayer and interparticle spaces in the bentonite [25]. Using the BET method the surface area were calculated for the initial bentonite and the composite bentonite-PANI, which was 99 and 59 m 2 /g respectively.…”