Eco-Friendly Chitosan Production by Syncephalastrum racemosum and Application to the Removal of Acid Orange 7 (AO7) from Wastewaters

Molecules

Anabelle C. L. Batista²  Marta C. Freitas Silva³  Jefferson B. Batista¹  Aline Elesbão Nascimento³ 

[1] Instituto Federal de Educação, Ciência e Tecnologia da Paraíba, Av. 1° de Maio, Jaguaribe 58015-430 João Pessoa, PB, Brasil; E-Mail:;Rede Nordeste de Biotecnologia (RENORBIO), Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos—52171-900 Recife, PE, Brasil; E-Mail:;Núcleo de Pesquisas em Ciências Ambientais (NPCIAMB), Universidade Católica de Pernambuco, Boa Vista 50 050-590 Recife, PE, Brasil; E-Mails:

关键词: microbiological chitosan;    acid orange 7 (AO7);    central composite rotational design;    agro-industrial residues;    Syncephalastrum racemosum;    corn steep liquor;    coagulation-flocculation;   

DOI  :  10.3390/molecules18077646

来源: mdpi

【 摘 要 】

Due to the existence of new methodologies that have reduced the production costs of microbiological chitosan, this paper puts forward the use of agro-industrial residues in order to produce microbiological chitosan and to apply chitosan as an innovative resource for removing acid orange 7 (AO7) from wastewaters. The best culture conditions were selected by a full 2⁴ factorial design, and the removal of the dye was optimized by a 2³ central composite rotational design. The results showed that corn steep liquor (CSL) is an agro-industrial residue that can be advantageously used to produce microbiological chitosan with yields up to 7.8 g/kg of substrate. FT-IR spectra of the product showed typical peak distributions like those of standard chitosan which confirmed the extracted product was chitosan-like. The efficiency of removing low concentrations of AO7 by using microbiological chitosan in distilled water (up to 89.96%) and tap water (up to 80.60%) was significantly higher than the efficiency of the control (chitosan obtained from crustaceans), suggesting that this biopolymer is a better economic alternative for discoloring wastewater where a low concentration of the dye is considered toxic. The high percentage recovery of AO7 from the microbiological chitosan particles used favors this biopolymer as a possible bleaching agent which may be reusable.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.