Sorption of mercury (II) and atrazine by biochar, modified biochars and biochar based activated carbon in aqueous solution
Sorption of mercury (II) and atrazine by biochar, modified biochars and biochar based activated carbon in aqueous solution
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DOI：
10.1016/j.biortech.2016.03.147
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发表时间：
2016-07-01
影响因子：
11.4
通讯作者：
Xu, Nan
中科院分区：
文献类型：
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作者：
Tan, Guangcai;Sun, Weiling;Xu, Nan
以玉米秸秆生物炭(BC)为原料，制备了Na2S改性生物炭(BS)、KOH改性生物炭(BK)和活性碳(AC)。实验比较了这些吸附剂对单独存在或混合存在的水汞(II)和阿特拉津的吸附能力。与BC相比，BS、BK和AC对单一汞(II)的吸附容量分别增加了76.95%、32.12%和41.72%，对阿特拉津的吸附容量分别增加了38.66%、46.39%和47倍。当汞(II)和阿特拉津共存于水溶液中时，这些吸附剂都发生了竞争吸附。硫磺浸渍是一种有效的强化汞(II)去除的方法，因为HGS沉淀的形成，而且吸附剂上的含氧官能团也有助于汞(II)的吸附。活性碳具有极高的比表面积，是脱除阿特拉津的最佳吸附剂。(C)2016爱思唯尔有限公司。保留所有权利。
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. (C) 2016 Elsevier Ltd. All rights reserved.