Removal of Pb(II), Cu(II), and Cd(II) from aqueous solutions by biochar derived from KMnO4 treated hickory wood. (December 2015)

• Record Type: Journal Article
• Authors: Wang, Hongyu; Gao, Bin; Wang, Shenseng; Fang, June; Xue, Yingwen; Yang, Kai
• Is Part Of: Bioresource technology. Volume 197(2015)
• Page Start: 356
• Page End: 362
• Publication Date: 2015-12
• Subjects: Biochar -- Lead -- Copper -- Cadmium -- Heavy metals; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2015.08.132
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Novel approach was developed to prepare an engineered biochar. Engineered biochar surface was covered with MnO x ultrafine particles. Engineered biochar had strong sorption ability to Pb(II), Cu(II), and Cd(II). Maximum sorption capacities were 153.1, 34.2 and 28.1 mg/g, respectively. Dosage, initial solution pH, and ionic strength affected heavy metal removal. Abstract: In this work, a novel approach was developed to prepare an engineered biochar from KMnO4 treated hickory wood through slow pyrolysis (600 °C). Characterization experiments with various tools showed that the engineered biochar surface was covered with MnO x ultrafine particles. In comparison to the pristine biochar, the engineered biochar also had more surface oxygen-containing functional groups and much larger surface area. Batch sorption experiments showed that the engineered biochar had strong sorption ability to Pb(II), Cu(II), and Cd(II) with maximum sorption capacities of 153.1, 34.2, and 28.1 mg/g, respectively, which were significantly higher than that of the pristine biochar. Batch sorption experiments also showed that the dosage, initial solution pH, and ionic strength affected the removal of the heavy metals by the biochars. The removal of the metals by the engineered biochar was mainly through surface adsorption mechanisms involving both the surface MnO x particles and oxygen-containing groups.