Why does sludge-based hydochar activate peroxydisulfate to remove atrazine more efficiently than pyrochar?
Why does sludge-based hydochar activate peroxydisulfate to remove atrazine more efficiently than pyrochar?
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为什么基于污泥的水炭比火炭更有效地活化过二硫酸盐以去除莠去津？
DOI：
10.1016/j.apcatb.2021.120663
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发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
Gang Xue
中科院分区：
文献类型：
--
作者：
Liangliang Zhang;Kai Wang;Luying Yu;Kaijie Luo;Shaopeng Guo;Hong Chen;Xiang Li;Yonghang Chen;Xin Yu;Yajie Qian;Yanbiao Liu;Gang Xue
比较了污泥水热炭（HC）和热解炭（PC）对过硫酸盐（PDS）去除阿特拉津（ATZ）的活化能力。单独的HC比单独的PC诱导更低的ATZ去除。HC/PDS系统对ATZ的去除率明显高于PC/PDS系统。ATZ去除通过吸附是非常低的，单线态氧（1 O2）主要有助于其去除，独立的PDS除了。与HC相比，PC具有更强的电子转移能力，表现出更高的ATZ去除率。加入PDS后，HC（36.3 ± 2.4 mg/g）中的腐殖物质（HS）对ATZ的降解起着决定性的作用：PDS将HS激发到三重态（3 HS *），然后PDS和3 HS * 一起产生更多的1 O2。同时，3 HS ~* 加速了HC表面的电子转移。因此，更多的电子从AZT转移到1 O2。而PC中少量HS（1.5 ± 0.2mg/g）的作用可忽略。
Sludge-derived hydrochar (HC) and pyrochar (PC) by hydrothermal and pyrolytic treatments were compared their peroxydisulfate (PDS) activation capacities toward atrazine (ATZ) removal. The HC alone induced lower ATZ removal than PC alone. However, ATZ removal was significantly enhanced in HC/PDS system rather than in PC/PDS system. ATZ removal via adsorption was very low, and singlet oxygen (1O2) primarily contributed to its removal, independently on the PDS addition. Compared to HC, PC possessed stronger electron transfer capacity, exhibiting a higher ATZ removal. After PDS addition, humic substances (HS) in HC (36.3 ± 2.4 mg/g) played a decisive role in enhanced ATZ degradation: PDS excited HS to a triplet state (3HS*); then, PDS and3HS* together yielded more1O2. Meanwhile,3HS* accelerated electron transfer on HC surface. Thus, more electrons were transferred from AZT to1O2. However, function of small amount of HS in PC (1.5 ± 0.2 mg/g) could be ignored.
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