title: Sorption of mercury (II) and atrazine by biochar, modified biochars and biochar based activated carbon in aqueous solution.
abstract: Corn straw biochar (BC) was used as a precursor to produce Na2S modified biochar (BS), KOH modified biochar (BK) and activated carbon (AC). Experiments were conducted to compare the sorption capacity of these sorbents for aqueous Hg (II) and atrazine existed alone or as a mixture. In comparison to BC, the sorption capacity of BS, BK and AC for single Hg (II) increased by 76.95%, 32.12% and 41.72%, while that for atrazine increased by 38.66%, 46.39% and 47 times, respectively. When Hg (II) and atrazine coexisted in an aqueous solution, competitive sorption was observed on all these sorbents. Sulfur impregnation was an efficient way to enhance the Hg (II) removal due to the formation of HgS precipitate, and oxygen-containing functional groups on the sorbents also contributed to Hg (II) sorption. Activated carbon was the best sorbent for atrazine removal because of its extremely high specific surface area.
authors.affiliation: Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China.
authors.forename: Guangcai
authors.initials: G
authors.lastname: Tan
authors.affiliation: College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
authors.forename: Weiling
authors.initials: W
authors.lastname: Sun
authors.affiliation: Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China.
authors.forename: Yaru
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
authors.forename: Hongyuan
authors.initials: H
authors.lastname: Wang
authors.affiliation: Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China. Electronic address: xunan@pkusz.edu.cn.
authors.forename: Nan
authors.initials: N
authors.lastname: Xu
mesh_terms: D000327:Adsorption; D001280:Atrazine / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D008628:Mercury / Q000737:chemistry*; D012996:Solutions; D018508:Water Purification / Q000379:methods*
chemical_list: D012996:Solutions; C540010:biochar; D002606:Charcoal; D008628:Mercury; D001280:Atrazine
keywords: Atrazine; Biochar; Chemical modification; Cosorption; Mercury (II)