title: Arsenic removal using natural biomaterial-based sorbents.
abstract: Arsenic contamination of water is a major problem worldwide. A possible solution can be approached through developing new sorbents based on cost-effective and environmentally friendly natural biomaterials. We have developed new sorbents based on biomaterial impregnation with iron oxyhydroxide. In this study, raw peat material, iron-modified peat, iron-modified biomass (shingles, straw, sands, cane and moss) as well as iron humate were used for the removal of arsenate from contaminated water. The highest sorption capacity was observed in iron-modified peat, and kinetic studies indicated that the amount of arsenic sorbed on this material exceeds 90 % in 5 h. Arsenate sorption on iron-modified peat is characterised by the pseudo-second-order mechanism. The results of arsenic sorption in the presence of competing substances indicated that sulphate, nitrate, chloride and tartrate anions have practically no influence on As(V) sorption onto Fe-modified peat, whereas the presence of phosphate ions and humic acid significantly lowers the arsenic removal efficiency.
authors.affiliation: Department of Environmental Science, University of Latvia, Raina Blvd 19, Riga, Latvia. linda_ansone@inbox.lv
authors.forename: Linda
authors.initials: L
authors.lastname: Ansone
authors.forename: Maris
authors.initials: M
authors.lastname: Klavins
authors.forename: Arturs
authors.initials: A
authors.lastname: Viksna
mesh_terms: D000327:Adsorption; D001149:Arsenates / Q000032:analysis / Q000737:chemistry; D001151:Arsenic / Q000032:analysis / Q000737:chemistry*; D018533:Biomass; D006812:Humic Substances; D058085:Iron Compounds / Q000737:chemistry*; D007700:Kinetics; D012987:Soil / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D014877:Water Pollution, Chemical / Q000032:analysis / Q000517:prevention & control*; D018508:Water Purification / Q000379:methods*
chemical_list: D001149:Arsenates; D006812:Humic Substances; D058085:Iron Compounds; D012987:Soil; D014874:Water Pollutants, Chemical; D001151:Arsenic; C025657:arsenic acid