川西平原還田秸稈DOM對(duì)礦物細(xì)顆粒吸附SMX的影響
[Abstract]:In order to investigate the mechanism of the effect of dissolved organic matter (DOM) on the adsorption of sulfamethoxazole (SMX) by fine mineral particles, the dynamic process of SMX adsorption by fine mineral particles and the effect of DOM on this process were studied. Fourier transform infrared (FI-IR) spectra of mineral particles before and after adsorption were compared and analyzed. The results show that the adsorption kinetics of SMX on mineral surface accords with the first-order dynamic model in two chambers, which indicates that there is multi-domain adsorption or multi-site adsorption in the adsorption process. The adsorption capacity of montmorillonite, albite and calcite increased by 28.94, 28.34 and 2.40 渭 g / g respectively under the action of DOM, while the model fitting degree of the three minerals decreased. The absorption peaks near 3700, 1600 and 1000cm ~ (- 1) and the broad absorption band at 3600cm ~ (- 1) of 3600m ~ (- 1) were obviously weakened after the adsorption of montmorillonite compared with those before adsorption, and the spectra of the adsorbed montmorillonite were basically consistent with those of DOM, and the absorption spectra of the adsorbed montmorillonite were similar to those of the adsorbed montmorillonite under the action of . The increase of adsorption capacity under the action of DOM is related to the increase of adsorption sites due to the binding of montmorillonite dissolution Al~ (3) with DOM. The infrared spectra of albite were consistent before and after adsorption, but the absorption peaks at wave number 1013781 and 460 cm ~ (- 1) of DOM decreased obviously, indicating that DOM was adsorbed on the surface of albite, and the adsorption capacity was increased by means of co-adsorption or accumulation. The infrared spectra of calcite were basically consistent before and after adsorption and under the action of DOM, indicating that DOM had no effect on calcite, and the increment of adsorption was due to the binding of DOM to SMX.
【作者單位】: 西南科技大學(xué)環(huán)境與資源學(xué)院;西南科技大學(xué)固體廢物處理與資源化教育部重點(diǎn)實(shí)驗(yàn)室;中國(guó)環(huán)境科學(xué)研究院環(huán)境基準(zhǔn)與風(fēng)險(xiǎn)評(píng)估國(guó)家重點(diǎn)實(shí)驗(yàn)室;成都樹(shù)德懷遠(yuǎn)中學(xué);
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(41403081) 四川省應(yīng)用基礎(chǔ)研究計(jì)劃項(xiàng)目(2015JY0168) 西南科技大學(xué)高端引進(jìn)人才項(xiàng)目(13zx7126);西南科技大學(xué)教學(xué)改革與研究項(xiàng)目(14xn0019);西南科技大學(xué)研究生創(chuàng)新基金資助項(xiàng)目(15ycx035) 綿陽(yáng)市科技計(jì)劃項(xiàng)目(15S-02-1)
【分類(lèi)號(hào)】:X131.3;X712
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