Biosorption of arsenic from aqueous solution using dye waste

• Published in: Environmental science and pollution research international 2013-02, Vol.20 (2), p.1161-1172
• Main Authors: Nigam, Shubha, Vankar, Padma S., Gopal, Krishna
• Format: Article
• Language: English
• Subjects: Adsorbents; Adsorption; Aquatic Pollution; Aqueous solutions; Arsenic; Arsenic - chemistry; Arsenic - isolation & purification; Arsenic removal; Atmospheric Protection/Air Quality Control/Air Pollution; Biomass; Biomedical materials; Biosorption; Canna indica; Carbon; Chelation; Coloring Agents - chemistry; Contact; Dye industry wastes; Dyes; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Fourier transforms; Hibiscus; Hibiscus - chemistry; Hydrogen-Ion Concentration; Industrial Waste; Industrial wastes; Kinetics; Metal concentrations; Metal ions; Metals; Microscopy, Electron, Scanning; Oxidation; Poisoning; Pollutant removal; Research Article; Rosa; Rosa - chemistry; Scanning electron microscopy; Sensors; Solutions; Spectroscopy, Fourier Transform Infrared; Studies; Surface chemistry; Tagetes - chemistry; Tagetes erecta; Temperature; Thermodynamics; Time Factors; Waste Water Technology; Wastes; Water Management; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - isolation & purification; Water Pollution - prevention & control; Water Pollution Control; Water Purification - methods; Water quality; Water treatment; X-ray spectroscopy
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-012-0966-1

The purpose of this study is to examine on removal of arsenic from water by biosorption through potential application of herbal dye wastes. Four different flower dye residues (after extraction of natural dye) viz. Hibiscus rosasinensis , Rosa rosa , Tagetes erecta , and Canna indica were utilized successfully for the removal of arsenic from aqueous solution. Batch studies were carried out for various parameters viz. pH, sorbent dose, contact time, initial metal ion concentration, and temperature. Data were utilized for isothermal, kinetic, and thermodynamic studies. Scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDAX), and Fourier transform infrared (FTIR) analyses of biomass were performed. The results showed that 1 g/100 ml for 5.0–5.5 h contact time at pH 6.0–7.5 with agitation rate 150 rpm provided 98, 96, 92, and 85 % maximum absorption of arsenic by R. rosa , H. rosasinensis , T. erecta , and C. indica , respectively, at initial concentration of 500 ppb. Data followed Langmuir isotherm showing sorption to be monolayer on heterogeneous surface of biosorbent. Negative values of ΔG° indicated spontaneous nature, whereas ΔH° indicates exothermic nature of system followed by pseudo-first-order adsorption kinetics. FTIR results showed apparent changes in functional group regions after metal chelation. SEM and EDAX analyses showed the changes in surface morphology of all test biosorbents. Herbal dye wastes, used as biosorbent, exhibited significant (85–98 %) removal of arsenic from aqueous solution. Hence, these biosorbents are cost-effective, easily available, eco-friendly, and comparatively more effective than other biosorbents already in use. These may be used to remove arsenic and other toxic metals from water.