Studies on Modified Montmorillonite Clay and Its PVA Nanohybrid for Water Purification

Autor: Honey John, E. J. Jelmy, Sona Stanly
Rok vydání: 2020
Předmět:
Zdroj: Journal of Polymers and the Environment. 28:2433-2443
ISSN: 1572-8919
1566-2543
DOI: 10.1007/s10924-020-01786-9
Popis: The removal of organic dyes from the aquatic system using modified Montmorillonite clay (MMT), one of the low cost adsorbent, was studied in this paper. Polyphosphoric acid (PPA) modified MMT (PMMT) with better surface area was used for adsorbing cationic dyes such as methylene blue(MB), rhodamine B (RB) and anionic dye Rose Bengal. The adsorption capacity of the PMMT clay for MB, RB and Rose Bengal dyes were 293.9 mg g−1, 244.77 mg g−1 and 296.13 mg g−1 respectively and all follows pseudo second order kinetics with Langmuir adsorption isotherm model. For better practical application polyvinyl alchohol (PVA) thin film composite with PMMT as filler was prepared and the adsorption studies were conducted. PVA composite film with 0.5 w/v% PMMT filler was found to be a good adsorbent for the cationic dye than anionic dyes and adsorbs 99% of MB dye from 30 mgL−1 dye solution. The composite film showed pseudo second order kinetics and better fit with the Langmuir model and the mono layer adsorption on the clay surface can be explained by electrostatic interaction between adsorbent and adsorbate. The introduction of the PMMT clay in the PVA matrix increases the thermal stability of neat PVA. Tensile strength of the composite was showing a gradual increase with the amount of PMMT filler and at 0.4% addition of PMMT in PVA, the tensile strength was increased up to 39% when compared to PVA film.
Databáze: OpenAIRE
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