A novel method for amino starch preparation and its adsorption for Cu(II) and Cr(VI)

• Published in: Journal of hazardous materials Vol. 181; no. 1; pp. 448 - 454
• Main Authors: Dong, Aiqin, Xie, Jie, Wang, Wenmin, Yu, Liping, Liu, Qian, Yin, Yeping
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.09.2010; Elsevier
• Subjects: Adsorbents; Adsorption; Amines - chemistry; Applied sciences; Chemical engineering; Chromium - isolation & purification; Conservation of Natural Resources - methods; Copper - isolation & purification; Crosslinking; Derivatives; Diffraction; Endothermic reactions; Ethylenediamine; Ethylenediamines - chemistry; Exact sciences and technology; Heavy metal ions; Isotherms; Metals, Heavy - isolation & purification; Methods; Pollution; Preparation; Starch; Starch - analogs & derivatives; Starch - chemical synthesis; Starch - chemistry; Starches; Thermodynamics; CASt; DASt; Heavy metal ions; EDA; Adsorption; CSt; DSC; Starch; Preparation; IR; ECH; XRD; Elementary analysis; Differential scanning calorimetry; Chemical analysis; Adsorption isotherm; Reuse; Metal ion; Endothermic reaction; X ray diffraction; Langmuir isotherm; Heavy metal; Infrared spectrometry; Trace element; Carcinogen; pH; Poison; Kinetics; Aqueous solution; Adsorbent; Copper; Chromium VI
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2010.05.031

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.