By a News Reporter-Staff News Editor at Journal of Engineering -- New research on Chemical Engineering is the subject of a report. According to news reporting out of Athens, Greece, by VerticalNews editors, research stated, "Composting may alter the sorption properties of organic materials deriving from renewable sources. The widely available olive tree pruning waste (OTPW) and its composted form (COTPW) were comparatively tested for Pb2+ and Ni2+ removal in single- and double-metal systems."
Our news journalists obtained a quote from the research from Agricultural University, "Pb2+ biosorption was higher than that of Ni2+ and increased metal biosorption was observed up to pH 5.0. The process followed pseudo-second order kinetics and described by the Langmuir isotherm. Surface area, total pore volume and zeta potential values were increased following composting, while cation exchange capacity was over-doubled (from 37.6 to 87.4 cmol, kg(-1)) leading to higher Pb2+ and Ni2+ biosorption and improved biosorption at elevated temperatures. There was 144%, 78%, and 148% increase in the maximum sorption capacity for Pb2+ and 29%, 59%, and 108% for Ni2+ at 10, 25 and 60 degrees C respectively. FTIR analysis indicated significant shifts in the chemical structure of OTPW as a result of composting, in line with oxidative decomposition processes. Among the desorption solutions tested, HNO3 and EDTA showed maximum recovery of both metals. Physisorption of both metals was greatly reduced by composting, leading to a biosorbent that retained Pb2+ and Ni2+ more efficiently. The suppressive effect of Ni2+ on Pb2+ sorption on OTPW throughout the whole range of Pb+2 concentrations, and the suppressive effect of Pb+2 on Ni+2 sorption at low Nr(2+) concentrations were both alleviated when composted OTPW was used."
According to the news editors, the research concluded: "Overall, OTPW proved to be a highly efficient biosorbent, especially for Pb2+, and composting resulted in multifunctional improvement of sorption characteristics."
For more information on this research see: Composting improves biosorption of Pb2+ and Ni2+ by renewable lignocellulosic materials. Characteristics and mechanisms involved. Chemical Engineering Journal, 2013;231():245-254. Chemical Engineering Journal can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland. (Elsevier - www.elsevier.com; Chemical Engineering Journal - www.elsevier.com/wps/product/cws_home/601273)
Our news journalists report that additional information may be obtained by contacting I. Anastopoulos, Agricultural University of Athens, Lab Soils & Agr Chem, Dept. of Nat Resources & Agr Engn, GR-11855 Athens, Greece. Additional authors for this research include I. Massas and C. Ehaliotis.
Keywords for this news article include: Athens, Greece, Europe, Chemical Engineering
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