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A Mannich base biosorbent derived from alkaline lignin for lead removal from aqueous solution
Yuanyuan Ge,Quanpeng Song,Zhili Li 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
A Mannich base biosorbent (AML) was prepared by grafting alkaline lignin (AL) with methylamine and formaldehyde. The effects of dosages, reaction time, pH and temperature of reaction on the nitrogen content of AML were investigated. A maximum nitrogen content of the Mannich base could reach to 8.32%. It was characterized by scanning electron microscopy (SEM), element analysis, and gel permeation chromatography (GPC). Kinetic adsorption suggested AML possessed fast adsorption for Pb2+ and followed a second-order model. Adsorption equilibrium results indicated AML had a maximum uptake of 60.5 mg/g for Pb2+ which was 4.2-fold higher than AL. The AML has good potential for cleanup of wastewater.
Yuanyuan Ge,Zhili Li,Yan Kong,Quanpeng Song,Kunqi Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Bi-functionalized lignin with amino and sulfonic groups (ASL) was synthesized via Mannich reaction andsulfomethylation. It was systematically characterized by FT-IR, element analysis, surface charge and XPS. Effects of initial pH, contact time and initial metal ion concentration on the adsorption of Cu(II) and Pb(II)onto ALS were studied. Results indicated that the biosorbent showed excellent performance for metalseven from low pH solutions. The adsorption kinetics and isotherms could be described well with Pseudosecond-order and D–R model, respectively. Further investigation of the metal-loaded ASL by FT-IR andXPS elucidated the amino and sulfonic groups reacted with metals in different way.