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Removal mechanism of di- n-butyl phthalate and oxytetracycline from aqueous solutions by nano-manganese dioxide modified biochar

机译:纳米锰二氧化氮改性生物炭水溶液与水溶液中邻苯二甲酸盐和催产素的去除机制

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摘要

Abstract In this work, nano-manganese dioxide (nMnO~(2))-modified biochar (BC) was synthesized in order to improve BC’s adsorption capacity for di- n -butyl phthalate (DBP) and oxytetracycline (OTC). The results showed that nMnO~(2)on the BC surface exhibited a poor crystallinity and oxidation state (Mn (IV)). Sorption experiments showed that, compared to BC, DBP sorption capacity of nMnO~(2)-BC (1:20) and OTC sorption capacity of nMnO~(2)-BC (1:10) were 0.0364 and 0.0867?mmol/g, respectively, which are significantly higher than that of BC (0.0141 and 0.0151?mmol/g). Kinetics and isotherm experiments indicated that physical adsorption and chemical interactions have both exerted their impacts on the adsorption process. Further X-ray photoelectron spectroscopy (XPS) analysis showed that part of the Mn (IV) in nMnO~(2)-BC was reduced to Mn (III) and Mn (II) after DBP or OTC adsorption. Therefore, we suggest the nMnO~(2)also acted as an oxidizer on modified BC, which may accelerate the degradation of DBP and OTC.
机译:摘要在这项工作中,合成了纳米二氧化锰(NMNO〜(2)) - 改性生物炭(BC),以提高邻苯二甲酸丁酯(DBP)和催产素(OTC)的BC的吸附能力。结果表明,BC表面上的NMNO〜(2)表现出差的结晶度和氧化态(Mn(IV))。吸附实验表明,与BC相比,NMNO〜(2)-BC(1:20)的DBP吸附能力和NMNO〜(2)-BC(1:10)的OTC吸附能力为0.0364和0.0867?mmol / g分别显着高于BC(0.0141和0.0151摩尔/克)的分别。动力学和等温性实验表明,物理吸附和化学相互作用既施加对吸附过程的影响。此外,X射线光电子能谱(XPS)分析表明,在DBP或OTC吸附后,将NMNO〜(2)-BC中的MN(IV)中的部分MN(IV)和Mn(II)降低至Mn(III)和Mn(II)。因此,我们建议NMNO〜(2)也用作改性BC上的氧化剂,这可能加速DBP和OTC的降解。

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