Mechanistic understanding of crystal violet dye sorption by woody biochar: implications for wastewater treatment
- 17 August 2017
- journal article
- research article
- Published by Springer Science and Business Media LLC in Environmental Geochemistry and Health
- Vol. 41 (4), 1647-1661
- https://doi.org/10.1007/s10653-017-0013-8
Abstract
Dye-based industries, particularly small and medium scale, discharge their effluents into waterways without treatment due to cost considerations. We investigated the use of biochars produced from the woody tree Gliricidia sepium at 300 °C (GBC300) and 500 °C (GBC500) in the laboratory and at 700 °C from a dendro bioenergy industry (GBC700), to evaluate their potential for sorption of crystal violet (CV) dye. Experiments were conducted to assess the effect of pH reaction time and CV loading on the adsorption process. The equilibrium adsorption capacity was higher with GBC700 (7.9 mg g−1) than GBC500 (4.9 mg g−1) and GBC300 (4.4 mg g−1), at pH 8. The CV sorption process was dependent on the pH, surface area and pore volume of biochar (GBC). Both Freundlich and Hill isotherm models fitted best to the equilibrium isotherm data suggesting cooperative interactions via physisorption and chemisorption mechanisms for CV sorption. The highest Hill sorption capacity of 125.5 mg g−1 was given by GBC700 at pH 8. Kinetic data followed the pseudo-second-order model, suggesting that the sorption process is more inclined toward the chemisorption mechanism. Pore diffusion, π–π electron donor–acceptor interaction and H-bonding were postulated to be involved in physisorption, whereas electrostatic interactions of protonated amine group of CV and negatively charged GBC surface led to a chemisorption type of adsorption. Overall, GBC produced as a by-product of the dendro industry could be a promising remedy for CV removal from an aqueous environment.Keywords
This publication has 49 references indexed in Scilit:
- Role of woody biochar and fungal-bacterial co-inoculation on enzyme activity and metal immobilization in serpentine soilJournal of Soils and Sediments, 2015
- Biochar as a sorbent for contaminant management in soil and water: A reviewChemosphere, 2014
- Production and use of biochar from buffalo‐weed (Ambrosia trifida L.) for trichloroethylene removal from waterJournal of Chemical Technology & Biotechnology, 2013
- Trichloroethylene adsorption by pine needle biochars produced at various pyrolysis temperaturesBioresource Technology, 2013
- Pyrolysis temperature induced changes in characteristics and chemical composition of biochar produced from conocarpus wastesBioresource Technology, 2013
- Removal of Crystal Violet Dye from Aqueous Solutions onto Date Palm Fiber by Adsorption TechniqueJournal of Chemistry, 2013
- Effective removal of high-chroma crystal violet over TiO2-based nanosheet by adsorption–photocatalytic degradationChemical Engineering Journal, 2012
- Adsorption of Crystal Violet from aqueous solution onto NaOH-modified rice huskCarbohydrate Polymers, 2011
- Agricultural based activated carbons for the removal of dyes from aqueous solutions: A reviewJournal of Hazardous Materials, 2009
- Studies on adsorption of crystal violet dye from aqueous solution onto coniferous pinus bark powder (CPBP)Journal of Hazardous Materials, 2009