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Enhanced Permanganate Oxidation of Sulfamethoxazole and Removal of Dissolved Organics with Biochar: Formation of Highly Oxidative Manganese Intermediate Species and in Situ Activation of Biochar
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-04-23 , DOI: 10.1021/acs.est.9b00180
Shi-Qi Tian 1 , Lu Wang 1 , Yu-Lei Liu 2 , Tao Yang 1 , Zhuang-Song Huang 1 , Xian-Shi Wang 1 , Hai-Yang He 1 , Jin Jiang 1 , Jun Ma 1
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Sulfamethoxazole (SMX) is a broad-spectrum antibiotic and was largely used in breeding industry. The reaction rate of SMX with KMnO4 is slow, and the adsorption efficiency of biochar for SMX was inferior (less than 11% in 30 min). By adding biochar powder into SMX solution with the addition of permanganate, the oxidation ratio of SMX surged to 97% in 30 min, and over 58% of the total organic carbon (TOC) was simultaneously removed. KMnO4 interacted with biochar and resulted in the formation of highly oxidative intermediate manganese species, which transformed SMX into hydrolysis products, oxygen-transfer products, and self-coupling products. Brunauer–Emmett–Teller (BET) analysis showed that surface area, total pore volume, and micropore volume of biochar increased by 32.1%, 36.4%, and 80.6%, respectively, after reaction process. This in situ activation of biochar with KMnO4 enhanced its adsorption capacity and led to great improvement of TOC removal. Besides KMnO4 oxidation, biochar also enhanced TOC removal in Mn(III) oxidation (KMnO4+ bisulfite) and ozonization of SMX. Considering that KMnO4 could react with biochar and result in the formation of intermediate manganese species, while biochar can be simultaneously activated and exhibit high capacity for organic adsorption, the combination of biochar with the chemical/advanced oxidation could be a promising process for the removal of environmental pollutants.

中文翻译:

磺胺甲恶唑的高锰酸盐氧化和生物炭去除溶解的有机物:高氧化锰中间物种的形成和生物炭的原位活化

磺胺甲恶唑(SMX)是一种广谱抗生素,广泛用于育种行业。SMX与KMnO 4的反应速度慢,生物炭对SMX的吸附效率较差(30分钟内不到11%)。通过在高锰酸盐的添加下将生物炭粉末添加到SMX溶液中,SMX的氧化率在30分钟内飙升至97%,并且同时去除了总有机碳(TOC)的58%以上。锰酸钾4与生物炭相互作用并导致形成高氧化性的中间锰物种,该物种将SMX转变为水解产物,氧转移产物和自耦合产物。Brunauer–Emmett–Teller(BET)分析显示,反应后,生物炭的表面积,总孔体积和微孔体积分别增加了32.1%,36.4%和80.6%。用KMnO 4原位活化生物炭增强了其吸附能力,并极大地提高了TOC去除率。除KMnO 4氧化外,生物炭还增强了Mn(III)氧化(KMnO 4 +亚硫酸氢盐)和SMX的臭氧化中的TOC去除率。考虑到KMnO 4 可与生物炭反应并形成中间锰物种,同时可同时活化生物炭并表现出高的有机吸附能力,生物炭与化学/高级氧化相结合可能是一种有前途的去除环境污染物的方法。
更新日期:2019-04-23
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