URANIUM(VI) BIOSORPTION BY DRIED ROOTS OFEICHHORNIA CRASSIPES(WATER HYACINTH)

Abstract

Uranium uptake by dried roots of Eichhornia crassipes was rapid and the biomass could remove 54% of the initial uranium present within 4 min of contact time. The process was favored at pH 5-6 and was least influenced by temperature. Biosorption data fitted to both Langmuir and Freundlich isotherm. The maximum loading capacity obtained was 371 mg U/g dry biomass. Distribution coefficient of 9336 ml/g was observed at a residual concentration of 4.9 mg U/L. Uptake increased at higher dose of biomass and reached a plateau beyond the concentration of 6 g/L. The specific metal ion uptake decreased with increasing initial uranium concentration. Anions (0.1 M) inhibited the uptake and followed the trend acetate > sulphate > nitrate > chloride. However presence of carbonate had no effect on uranium biosorption.

Contribution of water hyacinth (Eichhornia crassipes (Mart.) Solms) grown under different nutrient conditions to Fe-removal mechanisms in constructed wetlands

“…3) may also imply that apart from the abiotic oxidation of Fe 2+ and subsequent hydrolysis of Fe 3+ , water hyacinth exhibited a deprotonation reaction to enhance the phytoremediation of Fe 2+ as well as to solubilize the root hair adsorbed Fe-rich colloidal particles (Soltan and Rashed, 2003). This observed adsorption of Fe-rich colloidals may have been attributed to the fact that the surfaces of the fine root hairs of water hyacinth not only provide extraordinarily large surface areas with high affinity chemical receptors, but are also known to be specifically evolved with pH-dependent charged sites for the effective adsorption of Fe (Bhainsa and D'Souza, 2001;Hardy and O'Keeffe, 1985;Hardy and Raber, 1985;Matagi et al, 1998;Meagher, 2000;Soltan and Rashed, 2003).…”

Removal of Cr(VI) from wastewater using rice bran

“…Biosorption of heavy metals by bacterial fungal or algal biomass (live or dead cells) and agricultural waste biomass [1][2][3][4][5][6][7][8][9][10][11] has been recognized as a potential alternative to existing technologies such as precipitation, ion exchange, solvent extraction, and liquid membranes for removal of heavy metals from industrial wastewater because these processes have technical and/or economic constraints.…”

Removal of arsenic from contaminated water utilizing tea waste

“…Therefore, an inexpensive alternative to activated carbon can greatly increase the application of adsorption based method in various developing countries like Bangladesh. Materials such as tea waste, microbial biomass and straw etc., have already been tested generally as low-cost adsorbent (Aikpokpodion et al 2010;Amarasinghe and Williams 2007;Bhaina and D'Souza 2001;Cay et al 2004;Ingole and Bhole 2003;Kamsonlian et al 2011;Mahavi et al 2005;Wasewar 2010;Wasewar et al 2008). The use of waste materials as inexpensive adsorbent can have several additional advantages.…”