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Sorption of tetracycline on H2O2-modified biochar derived from rape stalk
Environmental Pollutants and Bioavailability ( IF 3.6 ) Pub Date : 2019-05-13 , DOI: 10.1080/26395940.2019.1607779
Zhenzhen Tan 1 , Xueyang Zhang 1, 2, 3 , Liping Wang 4 , Bin Gao 3 , Junpeng Luo 1 , Ru Fang 1 , Weixin Zou 2 , Na Meng 1
Affiliation  

To determine the sorption potential and mechanisms of tetracycline (TC) on pristine and H2O2-modified biochars, rape stalk biochars were produced and modified by H2O2. The specific surface area and pore volume of biochars increased with improving pyrolysis temperature, while the acidic groups decreased. Moreover, modified by H2O2, much more oxygen-containing functional groups were introduced. The results of sorption dynamics and isothermals tests showed that RB300 had the largest TC sorption capacity of 35.90 mg/g, which was ascribed to a plenty of non-carbonized organic matter and surface functional groups were retained. Modified by H2O2, the sorption of TC on biochars was enhanced which indicated the dominated sorption mechanisms were H-bonding and π–π electron donor acceptor interaction. The pH value would impact on sorption, and the maximum sorption capacity was obtained at pH = 9.0. Both cation concentration and type would affect the TC sorption.



中文翻译:

四环素对油菜秸秆H 2 O 2改性生物炭的吸附

为了确定四环素(TC)在原始和H 2 O 2改性生物炭上的吸附潜力和机理,生产了油菜秸秆生物炭并通过H 2 O 2对其进行了改性。随着热解温度的提高,生物炭的比表面积和孔体积增加,而酸性基团减少。而且,通过H 2 O 2改性,引入了更多的含氧官能团。吸附动力学和等温测试结果表明,RB300的最大TC吸附容量为35.90 mg / g,这归因于大量未碳化的有机物,并且保留了表面官能团。由H 2 O 2修饰,TC在生物炭上的吸附增强,表明主要的吸附机理是H键和π-π电子供体受体相互作用。pH值会影响吸附,并且在pH = 9.0时可获得最大吸附容量。阳离子浓度和类型都会影响TC的吸附。

更新日期:2019-05-13
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