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研究表征了十二烷基二甲基甜菜碱和十六烷基三甲基溴化铵改性凹凸棒石的结构,探讨了改性凹凸棒石对猪粪废水中的有机污染物的吸附性能及机理,并考察了改性剂修饰比例、废水p H、吸附剂的投加量对吸附过程的影响.结果表明,两种改性剂成功结合到了凹凸棒石表面,有机改性凹凸棒石的晶体结构未发生改变,但对有机污染物的吸附能力显著高于原土.两性和阳离子改性凹凸棒石吸附有机污染物的最佳参数为:修饰比例为100%,吸附剂浓度为16 g·L~(-1),p H=4(阳离子改性为6),对猪粪废水中COD的去除率分别达到88%和92%,吸附量分别达到79 mg·g~(-1)和82 mg·g~(-1).吸附过程均符合二级动力学模型(R2>0.998),两性和阳离子改性凹凸棒石对有机物的吸附分别符合Freundlich和Langmuir等温式.有机改性凹凸棒石的疏水性增强,提高了对有机污染物的吸附能力,其沉降性能良好,这使其作为一种吸附剂用于实际养猪废水的处理成为可能.
The structures of dodecyl dimethyl betaine and cetyl trimethyl ammonium bromide modified attapulgite were characterized and the adsorption performance of modified attapulgite to organic pollutants in pig manure wastewater was discussed And the mechanism of the modification process were also investigated.The effects of modifier modification ratio, waste water p H and adsorbent dosage on the adsorption process were investigated.The results showed that the two modifiers were successfully incorporated into the surface of attapulgite and the organic modified attapulgite , But the adsorption capacity of organic pollutants is significantly higher than that of the original soil.The best parameters for adsorption of organic pollutants on amphoteric and cationic modified attapulgite are as follows: the modification ratio is 100%, the concentration of adsorbent is 16 The removal rates of COD in pig manure wastewater were 88% and 92%, respectively, and the adsorption capacities reached 79 mg · g ~ (-1) ) And 82 mg · g -1, respectively, and the adsorption kinetics was in accordance with the second-order kinetic model (R2> 0.998) .The sorption of organic compounds by amphoteric and cationic modified attapulgite was in accordance with the Freundlich and Langmuir isotherms, respectively Palygorskite enhanced hydrophobicity, improve the adsorption capacity of organic pollutants, the settling properties of good, which makes it as Adsorbents used to treat actual swine wastewater is possible.