pH-Triggered Interfacial Interaction of Kaolinite/Chitosan Nanocomposites with Anionic Azo Dye

Abstract

Advanced engineering of naturally occurring materials opens new doors in nanoscience and nanotechnology for the separation and/or removal of environmental hazards. Here, a series of nanocomposites containing kaolinite and chitosan varying in the range of 20 to 80% (w/w) kaolinite were used for the adsorptive removal of a reactive textile dye, Remazol Red, from an aqueous solution. Batch experiments were carried out to investigate the effects of pH, contact time, and initial dye concentration on the adsorption capacity. Nanocomposites containing 80% kaolinite (w/w) and 20% chitosan (w/w), i.e., NK80C20, showed an equilibrium adsorption capacity of 371.8 mg/g at pH 2.5, which was 5.2 times higher than that of commercial activated charcoal. Moreover, NK80C20 was regenerated instantly up to 99.9% at pH 10. Therefore, NK80C20 can be effectively utilized as a potential adsorbent for the separation of Remazol Red and homologous azo dyes from industrial effluents. We expect that the findings from this study will play a vital role in environmental research leading to advanced applications in water purification.

Kaolinite-Chitosan based Nano-Composites and Applications

“…Regeneration studies were also carried out, and results showed that 99% of adsorbents could be regenerated. The results proved that chitosan-kaolinite nanocomposites could be used as potential adsorbents to remove azo dyes [42].…”

Mechanical and Thermal Properties of Self-Assembled Kaolin-Doped Starch-Based Environment-Friendly Nanocomposite Films

“…At 290 • C, the rate of maximum decomposition (R max ) was 17 µg/ • C for K 0 SNC film. A slightly higher decomposition rate, 22 µg/ • C, was found for the K 5 SNC and K 10 SNC films at 300 • C and 312 • C. Besides, the K 15 SNC film showeda drastically increased decomposition rate of 30 µg/ • C at 314 • C, which is lower than that obtained from K 20 SNC, R max = 36 µg/ • C, at T peak = 316 • C, indicating that the K 20 SNC film is more thermally unstable that the K 15 SNC film [27][28][29][30][31][32][33][34][35][36]. Figure 5 shows TMA and differential thermal mechanical analysis (DTMA) graphs obtained from 0% to 20% kaolin containing starch films.…”

New 5,5-(1,4-Phenylenebis(methyleneoxy)diisophthalic Acid Appended Zn(II) and Cd(II) MOFs as Potent Photocatalysts for Nitrophenols

“…It was found that the degrading utilization of PNP dramatically reduced at pH 4.0 and 8.0, while it increased highly when the pH value was 6.0. This finding has been reflected by the fact that the positively charged surface of the MOF 1 can benefit the electrostatic interactions with the anionic dyes (Figure S10e) [57,58].…”