DEGRADATION OF METHYLENE BLUE DYE IN AQUEOUS SOLUTION USING GREEN SYNTHESIZED NANO-SIZED ZnO PARTICLES
Abstract
- This research deals with degradation of methylene blue (MB) dye in aqueous solution using green synthesized nano-sized ZnO particles. The aim of this research is to prepare, characterize and study the degradation efficacy of green synthesized nano-sized ZnO particles. Leaves of Ma-yogyi (Calotropis gigantea L.) were collected from Kathitkan village in Aung Lan Township, Magway Region, Myanmar. Nano-sized ZnO particles were synthesized from zinc nitrate and zinc acetate sources using aqueous leaves extract of Ma-yo-gyi as a reducing agent via green synthesis. The green synthesized nano-sized ZnO particles were characterized by TG-DTA, XRD, SEM and TEM techniques. The effects of calcination temperature on the preparation and average crystallite size of particles were also studied. The green synthesized nano-sized ZnO particles have hexagonal phase with average crystallite size of (24-34) nm. Supported SEM and TEM images by the degradation efficacy of green synthesized nano-sized ZnO particles on MB nethylene blue(MB) dye were studied via various parameters such as effect of pH (3, 4, 5, 6, 7 and 8), effect of contact time (0, 30, 60, 90, 120, 150 and 180 min) and effect of dosage of nanosized ZnO particles (0.02, 0.03, 0.04 and 0.05 g). Dye removal activity was highest at pH 7 using both of green synthesized nano-sized ZnO particles. From the contact time experiment, at the end of the reaction (after 180 min), MB dye removal efficacy was upto 80-85 % of its initial value. Degradation percent of MB dye solution increased gradually with an increase in dosage of nanosized ZnO particles.
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Year
- 2020
Author
-
Khin Mar Cho
Subject
- Chemistry
Publisher
- Myanmar Academy of Arts and Science (MAAS)