Modified kraft lignin for bioremediation applications
authors Dos Santos, DAS; Rudnitskaya, A; Evtuguin, DV
nationality International
journal JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
author keywords Kraft lignin; oxidation; bioremediation; transition metals; atrazine
keywords OXYGEN DELIGNIFICATION; MODEL COMPOUNDS; HEAVY-METALS; LIGNOCELLULOSIC BIOSORBENT; AQUEOUS-SOLUTIONS; WOOD-PULP; SORPTION; CADMIUM; IONS; ADSORPTION
abstract Kraft lignin (KL) from industrial pulping of E. globulus wood was subjected to the oxidative modification with the aim to produce sorbent mimicking humic matter for the bioremediation purposes. Lignin was oxidized by polyoxometalate Na-5[PMo10V2O40] (POM), solely or in the presence of laccase, under pre-selected aerobic conditions (50-60 degrees C, 1-2h, oxygen pressure 5 bar). The most pronounced lignin oxidation without its depolymerisation was observed in the reaction system POM/O-2. Modified lignins possessed increased amounts of COOH (up to 15%) and CO (up to 500 %) groups, when compared to unmodified KL, and significantly higher molecular weights. Sorption capacity of KL before and after modification towards transition metals (cadmium (II) and mercury (II)) and triazine pesticide (atrazine) was assessed in batch experiments under equilibrium conditions. KL oxidation improved sorption capacity towards transition metals (up to 15%) but not necessarily the uptake of atrazine that was higher for unmodified KL.
publisher TAYLOR & FRANCIS INC
issn 1093-4529
year published 2012
volume 47
issue 2
beginning page 298
ending page 307
digital object identifier (doi) 10.1080/10934529.2012.640909
web of science category Engineering, Environmental; Environmental Sciences
subject category Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000299917400017
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