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Radiation‐Modified Carboxymethyl Starch Derivative as Metal Scavenger in Aqueous Solutions
Author(s) -
Pant Bhoj Raj,
Jeon HyeJin,
Park ChanIee,
Lee Byung Cheol,
Park Ji Hyun,
Song Hyun Hoon
Publication year - 2010
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.200900175
Subject(s) - aqueous solution , adsorption , chemistry , metal ions in aqueous solution , starch , nuclear chemistry , metal , yield (engineering) , cadmium , inorganic chemistry , materials science , organic chemistry , metallurgy
Corn starch was chemically modified using sodium chloroacetate to yield carboxymethyl starch (CMS). The aqueous solutions of CMS at 15 and 50% (w/w) concentration were then irradiated by electron beam (EB) at various dosages (1, 2, 3, 5, 10, 20, and 50 kGy), resulting in a cross‐linked carboxymethyl starch (CCMS). The maximum gel fraction, i.e. the highest degree of cross‐linking, was achieved with a 50% (w/w) aqueous CMS solution irradiated at 2 kGy EB dosage. Metal removal efficiency of the CCMS was then evaluated for the extraction of copper (Cu) and cadmium (Cd) ions from aqueous solutions. Our results showed that the metal adsorption is pH dependent and the adsorption increases with increase of the pH of the metal solution from acidic towards neutral. The adsorption efficiency also showed the maximum value at the highest gel content, demonstrating the enhancement of adsorption by the physical entrapment of the ions in the CCMS network in addition to the primary chemical adsorption.