Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 19, Pages 10634-10640Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b03131
Keywords
biochar; engineered carbon; biofuel residue; silver; nanocomposite
Funding
- National Natural Science Foundation of China [51402018]
- National Science Foundation [CBET-1054405]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1054405] Funding Source: National Science Foundation
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A novel approach was used to prepare engineered biochar from biofuel residue (stillage from bagasse ethanol production) through slow pyrolysis. The obtained biochar was characterized for its physicochemical properties as well as silver sorption ability. Sorption experimental data showed that engineered biochar quickly and efficiently removed silver ion (Ag+) from aqueous solutions with a Langmuir maximum capacity of 90.06 mg/g. The high sorption of Ag+ onto the biochar was attributed to both reduction and surface adsorption mechanisms. The reduction of Ag+ by the biochar was confirmed with scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy analyses of the postsorption biochar, which clearly showed the presence of metallic silver nanopartides on the surface of the carbon matrix. An antimicrobial ability test indicated that silver-laden biochar effectively inhibited the growth of Escherichicr coli, while the original biochar without silver nanopartides promoted growth. Thus, biochar, prepared from biofuel residue materials, could be potentially applied not only to remove Ag+ from aqueous solutions but also to produce a new value-added nanocomposite with antibacterial ability.
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