Semi-Continuous Adsorption Processes with Multi-Walled Carbon Nanotubes for the Treatment of Water Contaminated by an Organic Textile Dye
Open Access
- 13 February 2021
- journal article
- research article
- Published by MDPI AG in Applied Sciences
- Vol. 11 (4), 1687
- https://doi.org/10.3390/app11041687
Abstract
Adsorbent columns, containing different amounts of multi-walled carbon nanotubes (MWCNTs), in a semicontinuous process were studied. The optimal conditions for the discoloration of water contaminated by an azoic organic textile dye were investigated. In particular, as representative of contaminated water, a highly concentrated solution of Reactive Black 5 (RB5) equal to 37 mg/L was utilized. A predetermined volume of dye solution, equal to 100 mL, was subjected to repeated cycles of adsorption until the eluted solution became colorless. This adsorption operation was carried out for different types of columns. Adsorbent performances as a function of characteristics of each column were investigated. For each column, the optimum quantity of MWCNTs, maximum volume of treatable solution, carbon usage rate (CUR), empty bed contact time (EBCT), and adsorption capacity were determined. The permeate was characterized by UV-VIS analysis and TOC analysis, while adsorbent material (MWCNTs) was characterized by thermogravimetric TG-DTA analysis. The column containing 2.5 g of carbon nanotubes was revealed to be the best one for the total amount of Reactive Black 5 adsorbed, i.e., 55 mg/g(MWCNTs) The research has shown the high adsorption efficiency of carbon nanotubes toward RB5 dye, highlighting the degradation of the dye molecule and the stratification, inside the columns, of the adsorbed compound.This publication has 74 references indexed in Scilit:
- Efficiency of various recent wastewater dye removal methods: A reviewJournal of Environmental Chemical Engineering, 2018
- Decolorization of reactive black 5 using dielectric barrier discharge in the presence of inorganic saltsJournal of the Serbian Chemical Society, 2012
- Bioremediation of textile effluent using Phanerochaete chrysosporiumAfrican Journal of Food, Agriculture, Nutrition and Development, 2011
- Comparative Analysis of Bioremediation Potential of Adapted and Non-Adapted Fungi on Azo Dye Containing Textile EffluentPakistan Journal of Biological Sciences, 2011
- Decolorization of Synthetic Wastewater Containing Azo Dyes in a Batch-Operated Rotating Biological Contactor Reactor with the Immobilized Fungus Phanerochaete chrysosporiumIndustrial & Engineering Chemistry Research, 2010
- Anaerobic/aerobic treatment of a simulated textile wastewaterSeparation and Purification Technology, 2008
- Decolorization of Reactive Blue 19 Dye from Textile Wastewater by the UV/H2O2 ProcessJournal of Applied Sciences, 2008
- Decolorization of textile azo dyes by newly isolated halophilic and halotolerant bacteriaBioresource Technology, 2007
- Aromatic amines from azo dye reduction: status review with emphasis on direct UV spectrophotometric detection in textile industry wastewatersDyes and Pigments, 2004
- Fate of dyes in aquatic systems: I. Solubility and partitioning of some hydrophobic dyes and related compoundsEnvironmental Toxicology and Chemistry, 1988