Photocatalytic degradation of methyl orange using pullulan-mediated porous zinc oxide microflowers
- 25 September 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Environmental Science and Pollution Research
- Vol. 28 (5), 5774-5785
- https://doi.org/10.1007/s11356-020-10939-1
Abstract
One of mankind’s biggest concerns is water pollution. Textile industry emerged as one of the main contributors with dyes as the main pollutant. Presence of dyes in water is very dangerous due to their toxicity; thus, it is important to remove them from water. In these recent years, heterogeneous advance oxidation process surfaced as a possible dyes’ removal technique. This process utilizes semiconductor as photocatalyst to degrade the dyes in presence of light and zinc oxide (ZnO) appears to be a promising photocatalyst for this process. In this study, pullulan, a biopolymer, was used to produce porous ZnO microflowers (ZnO-MFs) through green synthesis via precipitation method. The effects of pullulan’s amount on the properties of ZnO-MFs were investigated. The ZnO-MF particle size decreased with the increased of pullulan amount. Interestingly, formation of pores occurred in presence of pullulan. The synthesized ZnO-MFs have the surface area ranging from 6.22 to 25.65 m2 g−1 and pore volume up to 0.1123 cm3 g−1. The ZnO-MF with the highest surface area was chosen for photocatalytic degradation of methyl orange (MO). The highest degradation occurred in 300 min with 150 mg catalyst dosage, 10 ppm initial dye concentration, and pH 7 experimental conditions. However, through comparison of photodegradation of MO with all synthesized ZnO-MFs, 25PZ exhibited the highest degradation rate. This shows that photocatalytic activity is not dependent on surface area alone. Based on these results, ZnO-MF has the potential to be applied in wastewater treatment. However, further improvement is needed to increase its photocatalytic activity.Funding Information
- Universiti Teknologi Malaysia (#20H33, #20H55)
- Malaysian Ministry of Higher Education (5F031)
This publication has 49 references indexed in Scilit:
- Efficient Removal of Anionic and Cationic Dyes from an Aqueous Solution Using Pullulan-graft-Polyacrylamide Porous HydrogelWater, Air, & Soil Pollution, 2014
- Biotemplated Synthesis of Anatase Titanium Dioxide Nanoparticles via Lignocellulosic Waste MaterialBioMed Research International, 2014
- Synthesis and characterization of pullulan-mediated silver nanoparticles and its antimicrobial activitiesCarbohydrate Polymers, 2013
- Catalysis in Fuel Cells and Hydrogen ProductionPublished by Elsevier BV ,2013
- Cost-effective large-scale synthesis of ZnO photocatalyst with excellent performance for dye photodegradationChemical Communications, 2012
- Preparation of zinc oxide nanospheres by solution plasma process and their optical property, photocatalytic and antibacterial activitiesMaterials Letters, 2011
- Facile Synthesis of Monodisperse Porous ZnO Spheres by a Soluble Starch-Assisted Method and Their Photocatalytic ActivityThe Journal of Physical Chemistry C, 2011
- Strategies of making TiO2 and ZnO visible light activeJournal of Hazardous Materials, 2009
- Photocatalytic Degradation of Two Commercial Reactive Dyes in Aqueous Phase Using NanophotocatalystsNanoscale Research Letters, 2009
- Determination of structural peculiarities of dexran, pullulan and γ-irradiated pullulan by Fourier-transform IR spectroscopyCarbohydrate Research, 2002