A novel modification of lignin on corncob-based biochar to enhance removal of cadmium from water. (July 2018)

• Record Type: Journal Article
• Authors: Luo, Mingke; Lin, Hai; Li, Bing; Dong, Yingbo; He, Yinhai; Wang, Liang
• Is Part Of: Bioresource technology. Volume 259(2018)
• Page Start: 312
• Page End: 318
• Publication Date: 2018-07
• Subjects: Biochar -- Agricultural waste -- Grafting modification -- Heavy metal -- Lignin; 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.2018.03.075
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: The lignin of corncob-based biochar can be grafted by acrylonitrile. The modified biochar showed extraordinary Cd adsorption capacity. The Cd removal mechanism is ion exchange and adsorption-complexation. A new method to recycle agricultural waste. Abstract: In order to improve the adsorption capacities of corncob-based biochars for heavy metal, the different pyrolysis temperature (350 °C, 450 °C and 550 °C) of corncob-based biochars were modified with the acrylonitrile, and adsorption capacities of Cadmium from solution by biochars were studied. The results showed that only at 350 °C the biochar can be successfully modified. The Cd adsorption capacity (85.65 mg/g) by the biosorbent was higher than other methods of modifying biochars previously reported. SEM-EDS and FTIR confirmed that the CN group was grafted on the biochar at low pyrolysis temperature. Batch adsorption experiment including pH-dependence, adsorption kinetics, and isotherms and XPS results showed that the removal mechanism of Cd(II) by the modified biochar was ion exchange and adsorption-complexation. This research not only obtained a novel method to modify biochar but also furthered research into the lignin of biochar composition, and provided an efficient sorbent for heavy metal.