Modification of Kaolin with Carbon Quantum Dots as Composite for Methylene Blue Removal: Literature Review and Experiment

Abstract

The modification of kaolin with nano-size fillers has exhibited excellent performance in the adsorption process. Carbon quantum dots (CQDs) are the new generation of nanoparticles that have attracted interest for their utilization as modifiers. In this study, a composite of metakaolin(MK)/CQDs was synthesized and tested for methylene blue (MB) removal. The heating and acid-alkali treatment of kaolin transformed it into MK. The interaction between MK and CQDs was analyzed using XPS to detect the binding of pyridic NH2 and C-N. By loading CQDs into the kaolin matrix, the surface area was improved and the removal of MB increased. For a lower MB concentration at 5 ppm, the removal efficiency could reach 96%. The composite exhibited good regeneration through the recyclability test.

Sustainable Biochar Carbon Biosorbent Based on Tamarind (Tamarindusindica L) Seed: Literature Review, Preparation, and Adsorption Isotherm

“…To support the SDGs, the quest for the use of cheap, readily available, efficient, and environmentally friendly adsorbents is crucial. Biochar or carbon materials are one of the effective materials, making them to be well-research [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Several adsorbents have been proposed using agricultural waste, from leaves, seeds, roots, and bark [30].…”