title: Adsorption characteristics of Pb2+on natural black carbon extracted from different grain-size lake sediments.
abstract: As a major organic component in aquatic sediments, black carbon (BC) could act as super surface sorbent for contaminants in soils or sediments due to its relatively structured carbon matrix with high degree of porosity and extensive surface area. In this work, the adsorption characteristics of Pb2+were studied using BCs as adsorbents, which were extracted from four particle sizes of sediment from Lake Wuliangsuhai (WLSH), under conditions of different pH, BC content, and ionic strength. The results showed BC content near to 1 % of sediments from WLSH, in which BC1, BC2, BC3, and BC4 composited about 1.8, 1.6, 1.1, and 0.8 % in the sediment fractions of >180, 180-63, 63-32, and <32 μm, respectively. The specific surface area and the Pb2+sorption capacity were increased with decreasing the particle size of BCs. Correspondingly, the adsorption percentage of Pb2+increased with increasing initial pH and BC content but declined as the increase of ionic strengths. The Pb2+sorption capacity was reached maximum at pH 5-6. Compared pre- to post-sorption BCs by SEM-EDS and FTIR, although the carboxyl (C=O) and phenol (OH) groups on BC fractions contributed to Pb2+sorption, the main adsorption mechanism of BCs was the surface sorption at pH <6. Relatively, the contribution of BCs accounted for about 18 % of Pb2+sorption capacity on sediments. This work is helpful to understand the environmental effects of different size fractions BCs extracted from natural sediments.
authors.affiliation: College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China.|Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Ding
authors.affiliation: College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China. lcw2008@imu.edu.cn.|Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China. lcw2008@imu.edu.cn.
authors.forename: Changwei
authors.initials: C
authors.lastname: Lü
authors.affiliation: College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China. ndjhe@imu.edu.cn.|Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China. ndjhe@imu.edu.cn.|College of Life Sciences, Inner Mongolia University, Hohhot, 010021, China. ndjhe@imu.edu.cn.
authors.forename: Jiang
authors.initials: J
authors.lastname: He
authors.affiliation: College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China.|Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China.|College of Life Sciences, Inner Mongolia University, Hohhot, 010021, China.
authors.forename: Boyi
authors.initials: B
authors.lastname: Zhao
authors.affiliation: College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China.|Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China.|College of Life Sciences, Inner Mongolia University, Hohhot, 010021, China.
authors.forename: Jinghua
authors.initials: J
authors.lastname: Wang
authors.affiliation: College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China.|Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China.
authors.lastname: Enhe
authors.affiliation: College of Life Sciences, Inner Mongolia University, Hohhot, 010021, China.
authors.forename: Haijun
authors.initials: H
authors.lastname: Zhou
authors.affiliation: College of Animal Science, Inner Mongolia Agricultural University, Hohhot, 010010, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D002413:Cations, Divalent; D019015:Geologic Sediments / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D060106:Lakes / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D053260:Soot / Q000737:chemistry*
chemical_list: D002413:Cations, Divalent; D053260:Soot; D007854:Lead
keywords: Adsorption mechanism; Black carbon; Grain size; Pb2+; Sediment