科研之友
微信
新浪微博
Facebook
分享链接
摘要
Grape vine shoots were utilized as the biomass feedstock and pyrolyzed under temperatures ranging in 300 degrees C-600 degrees C with nitrogen atmosphere to produce biochars. The surface properties of the as-obtained biochars were characterized, followed with the careful investigation of the adsorption of lead and cadmium removal in aqueous environments. All as-prepared biochars had weak alkali characteristics and large amount of mineral species, which can greatly improve the adsorption performance. Outstanding storing capacities of 250.81, 327.31, 377.36 mg g(-1) for Cd2+ and 156.12, 237.25, 258.86 mg g(-1) for Pb2+ were exhibited by biochar pyrolyzed under 300 degrees C, 450 degrees C and 600 degrees C, respectively. The adsorption equilibrium could be reached about 7 h and the suitable solution pH should be above 3. Both Langmuir and Freundlich models fitted the data well and precipitation was found to be the dominant mechanism for the adsorption of both metals. Overall, grape vine shoots are confirmed to be a promising feedstock to produce biochar sorbents of heavy metals in wastewater with excellent performance, economic cost, and easy process.
