[Influence of surface chemical properties and pore structure characteristics of activated carbon on the adsorption of nitrobenzene from aqueous solution].
Commercial activated carbon was treated by HNO3 oxidation and then subsequently heat treated under N2 atmosphere. Effect of surface chemical properties and pore structure on the adsorption performance of nitrobenzene was investigated. N2/77K adsorption isotherm and scanning electron microscopy (SEM) were used to characterize the pore structure and surface morphology of carbon. Boehm titration, Fourier transform infrared spectroscopy (FTIR), the point of zero charge (pH(PZC)) measurement and elemental analysis were used to characterize the surface properties. The results reveal that HNO3 oxidation can modify the surface chemical properties, increase the number of acidic surface oxygen-containing groups and has trivial effect on the pore structure of carbon. Further heat treatment can cause the decomposition of surface oxygen-containing groups, and increase the external surface area and the number of mesopores. Adsorption capacity of nitrobenzene on AC(NO-T), AC(raw) and AC(NO) was 1011.31, 483.09 and 321.54 mg x g(-1), respectively. Larger external surface area and the number of meso-pores, together with the less acid surface oxygen-containing groups were the main reason for the larger adsorption capacity AC(NO-T).
Liu
Shou-Xin
SX
Key Laboratory of Biological Materials, Ministry of Education, Northeast Forestry University, Harbin 150040, China. liushouxin@126.com
Chen
Xi
X
Zhang
Xian-Quan
XQ
D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D009578:Nitrobenzenes / Q000737:chemistry* / Q000302:isolation & purification; D016062:Porosity; D012996:Solutions / Q000737:chemistry; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification
D009578:Nitrobenzenes; D012996:Solutions; D014874:Water Pollutants, Chemical; D002606:Charcoal; C036077:nitrobenzene