【摘要】：以湘江牌樓口江段河床表層沉積物為吸附劑,以鎘單獨污染模擬水樣和鎘-苯酚復(fù)合污染模擬水樣為吸附質(zhì),比較研究了湘江牌樓口江段河床表層沉積物對兩組模擬水樣中鎘的吸附規(guī)律,并進一步研究了苯酚存在對沉積物吸附鎘的影響。結(jié)果表明:不論苯酚存在與否,湘江牌樓口江段河床表層沉積物對鎘的吸附動力學(xué)均符合準二級動力學(xué)模型,以化學(xué)吸附為主;吸附等溫線均符合Langmuir等溫吸附模型,屬單分子層吸附;苯酚的存在增加了沉積物對鎘的吸附量,其影響主要是苯酚和沉積物中的氫鍵與鎘發(fā)生了配位絡(luò)合作用;當模擬水樣pH值增大時,苯酚對沉積物吸附鎘的促進作用減弱,主要原因是中性條件下,鎘與沉積物中存在的硫化物、氫氧化物和碳酸鹽等發(fā)生反應(yīng),削弱了苯酚的競爭吸附作用。
[Abstract]:In this paper, the surface sediment of the river bed in the estuary of the Xiangjiang River was used as adsorbent, the simulated water samples polluted by cadmium alone and the water samples polluted by cadmium and phenol were used as adsorbents. The adsorption law of cadmium in two groups of simulated water samples by the surface sediment of the river bed in the river reach of Baikou section of Xiangjiang River was studied, and the effect of phenol on the adsorption of cadmium in sediment was further studied. The results show that the adsorption kinetics of cadmium on the surface sediment of the river bed in the estuary section of the Xiangjiang River is in accordance with the quasi-second-order kinetic model, and chemisorption is the main one, regardless of whether phenol exists or not. The adsorption isotherms all accord with Langmuir isothermal adsorption model and belong to monolayer adsorption. The presence of phenol increases the amount of cadmium adsorbed by sediment and the effect is mainly due to the complexation of hydrogen bond in phenol and sediment with cadmium. When the pH value of simulated water samples increased, the effect of phenol on cadmium adsorption was weakened, mainly due to the reaction between cadmium and sulfides, hydroxides and carbonates in sediments under neutral conditions. The competitive adsorption of phenol was weakened.
【作者單位】： 湖南大學(xué)土木工程學(xué)院;
【基金】：湖南省建設(shè)廳科技項目(湘財建指[2015]105號)
【分類號】：O647.3;X52

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1 李晨芮;負載型磷化鎳催化劑對苯酚的加氫性能研究[D];鄭州大學(xué);2017年

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本文編號：2424743