酸堿改性生物炭對(duì)水中磺胺噻唑的吸附性能研究
[Abstract]:Using potato stem and leaf as raw material, biological carbon was prepared by oxygen-limited pyrolysis method. Acid and alkali were prepared by H2SO4 and KOH treatment. The structure and properties of three kinds of biochar before and after modification were studied by (BET), scanning electron microscope (SEM) and IR (FTIR). The adsorption time, temperature and initial concentration of sulfathiazole were studied by single factor experiment. The effect of pH value on the adsorption of sulfathiazole by three kinds of biological carbon modified by acid-base was studied. The results show that the adsorption behavior of three kinds of biochar for sulfathiazole accords with the quasi second-order kinetic equation, the adsorption isotherm of acid-modified biochar accords with Temkin model, and the adsorption isotherm curve of raw carbon and alkali-modified biochar accords with Freundlich model. The adsorption capacity of sulfathiazole was greatly improved by acid modification, and the maximum adsorption capacity was 7.69 mg g ~ (-1), which was 2.4 times of that of the original carbon, while solution pH had no obvious effect on the adsorption of sulfathiazole by three kinds of biochar. Thermodynamic study showed that the adsorption of sulfathiazole on acid-modified biochar was a spontaneous endothermic reaction. FTIR analysis showed that there were more oxygen-containing functional groups on the surface of acid-modified biochar, which provided the adsorption point for the adsorption of sulfathiazole. Hydrogen bond, van der Waals force and dipole force play a major role in the adsorption of sulfathiazole by biochar.
【作者單位】: 蘭州大學(xué)資源環(huán)境學(xué)院甘肅省環(huán)境污染預(yù)警與控制重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金(No.21307050) 蘭州大學(xué)中央高;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(No.lzujbky-2016-162)~~
【分類號(hào)】:TQ424;X52
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