Chitosan extraction from lobster shells and its grafted with functionalized MWCNT for simultaneous removal of Pb2+ ions and eriochrome cyanine R dye after their complexation

Publication date: September 2017
Source:International Journal of Biological Macromolecules, Volume 102
Author(s): Shadi Kheirandish, Mehrorang Ghaedi, Kheibar Dashtian, Fatemeh Heidari, Faezeh Pourebrahim, Shaobin Wang
Chitosan (CS) extracted from lobster shells (Persian Gulf, Iran), was grafted with amino functionalized multiwalled carbon nanotube (MWCNT). This novel material was characterized by FE-SEM and FT-IR and used for the ultrasound-assisted removal of Pb²⁺ ions and eriochrome cyanine R (ECR) dye. A central composite design (SCCD) under response surface methodology was used for studying the influences of important variables in removal process such as initial ECR and Pb²⁺ ions concentrations, adsorbent mass and sonication time on the removal efficiency. Linear, 2FI, quadratic and cubic models were performed and a quadratic model was selected for analysis of each response. ANOVA for the quadratic model shows the F-value parameter (820.44 and 537.12 for ECR and Pb²⁺ ions removal, respectively) and very low p-value (<0.0001), implying that the model was highly significant for understudy analytes adsorption. To achieve maximum removal, the optimum condition was determined and were set as:19.34 and 18.20mgL⁻¹,0.018g and 9.35min for initial ECR and Pb²⁺ ion concentrations, adsorbent mass and sonication time, respectively. At these optimum conditions, 97.06% of ECR and 99.29% of Pb²⁺ ions were removed in a short time.

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