title: A novel method for amino starch preparation and its adsorption for Cu(II) and Cr(VI).
abstract: A novel method was proposed to prepare amino starch by reacting ethylenediamine with previously synthesized dialdehyde starch. Different factors affecting the preparation, i.e., ethylenediamine concentration, ethylenediamine:dialdehyde starch molar ratio, pH, duration and temperature have been studied. The modified starch was characterized by IR spectroscopy, elemental analysis, X-ray diffraction and differential scanning calorimetry. The amino starch derivatives were evaluated as adsorbents. The adsorption activity for heavy metals such as Cu(II) and Cr(VI) by crosslinked amino starch was studied in terms of adsorption amount, kinetics and isotherm; and adsorbent reuse were also studied. Adsorption processes for Cu(II) and Cr(VI) on crosslinked amino starch fit a Langmuir isotherm, and adsorption for Cu(II) and Cr(VI) from aqueous solution was endothermic reactions. Crosslinked amino starch was very effective for the adsorption of Cu(II) and Cr(VI), and efficient in capacity, recycled.
authors.affiliation: Department of Chemistry, College of Science, Jiangxi Agricultural University, Nanchang, PR China. aegean.dong@gmail.com
authors.forename: Aiqin
authors.initials: A
authors.lastname: Dong
authors.forename: Jie
authors.initials: J
authors.lastname: Xie
authors.forename: Wenmin
authors.initials: W
authors.lastname: Wang
authors.forename: Liping
authors.initials: L
authors.lastname: Yu
authors.forename: Qian
authors.initials: Q
authors.lastname: Liu
authors.forename: Yeping
authors.initials: Y
authors.lastname: Yin
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry; D002857:Chromium / Q000302:isolation & purification*; D003247:Conservation of Natural Resources / Q000379:methods; D003300:Copper / Q000302:isolation & purification*; D005029:Ethylenediamines / Q000737:chemistry; D019216:Metals, Heavy / Q000302:isolation & purification; D008722:Methods; D013213:Starch / Q000031:analogs & derivatives / Q000138:chemical synthesis / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D000588:Amines; D005029:Ethylenediamines; D019216:Metals, Heavy; D002857:Chromium; C074702:chromium hexavalent ion; C031234:ethylenediamine; D003300:Copper; D013213:Starch; C012880:dialdehyde starch