【作者】 张米娜；

【导师】 石碧；

【作者基本信息】 四川大学 ， 皮革化学与工程， 2005， 硕士

【摘要】 本论文研究了含铬废革屑对水体中酸性染料(酸性嫩黄G和酸性黑ATT)、直接染料(直接桃红12B和直接橘红)、阴离子表面活性剂(十二烷基苯磺酸钠,SDBS)、阳离子表面活性剂(十二烷基三甲基溴化铵,DTB)、非离子表面活性剂(曲拉通X-100,TX-100)的吸附特性。结果表明,含铬废革屑能有效地去除水体中阴离子染料和阴离子表面活性剂。含铬废革屑对阴离子染料和阴离子表面活性剂的吸附平衡线符合Langmuir方程。酸性pH有利于含铬废革屑对阴离子染料和阴离子表面活性剂的吸附,平衡吸附量随着pH升高而降低。温度对染料和表面活性剂的吸附有较大影响,当温度为293K、初始浓度为2000mg/L时,直接桃红12B、直接橘红、酸性嫩黄G、酸性黑ATT、SDBS的平衡吸附量分别为821mg/L、467mg/L、765mg/L、798mg/L和389mg/L;当温度升高至323K时,它们的平衡吸附量增加至1396mg/L、598mg/L、837mg/L、968mg/L和394mg/L。这表明,吸附剂对染料和表面活性剂的吸附可能为化学吸附。增加溶液中离子强度能促进含铬废革屑吸附剂对阴离子表面活性剂的吸附,却会减少染料的平衡吸附量。当适当的吸附剂用量时,含铬废革屑对染料和表面活性剂的吸附率更多还原

【Abstract】 The adsorption behaviors of chromium-containing leather waste to anionic dyes (direct pink 12B, direct orange, acid flavine G and acid ATT), anionic surfactant (sodium dodecylbenzenesulfonate, SDBS), cationic surfactant (dodecyl trimethylammonium bromide, DTB) and non-ionic surfactant (Triton X-100, TX-100) in aqueous solution were investigated. The results indicated that both anionic dyes and anionic surfactant could be significantly adsorbed by this novel adsorbent. The adsorption isotherms of direct pink 12B, direct orange, acid flavine G, acid ATT and SDBS on the adsorbent could be fitted by Langmuir model. Acidic pH value favors the adsorption of the anionic compounds and their adsorption capacities decrease with the increase of pH value. The adsorption capacities of dyes and surfactants increased with the rise of temperature. For example, the biggest adsorption amounts of direct pink 12B, direct orange, acid flavine G, acid ATT and SDBS at 293K were 821mg/L, 467 mg/L, 765 mg/L, 798 mg/L and 389mg/L respectively, when initial concentration of solution was 2000mg/L, and it reached 1396mg/L, 598 mg/L, 837 mg/L, 968 mg/L and 394 mg/L at 313K respectively, which indicates that the mechanism of the adsorption might be chemical adsorption. Meanwhile, bigger ion strength leaded to higher adsorption capacity of SDBS onadsorbent, whilst it is contrary to the adsorption of dyes. The removal extent of anionic dyes and surfactant increases with increasing amount of adsorbent and the value was easy to attaine 95%. For the direct pink 12B, direct orange and acid ATT, they could be completely removed from solution using a proper amount of adsorbent. The adsorption kinetics data could be well described by the pseudo-second-order rate model. The adsorption capacities calculated by the pseudo-second-order rate model were close to those determined by actual measurement. The column adsorption kinetics studies showed that the adsorption column has a high availability for adsorption of anionic dyes and anionic surfactant. For example, when the adsorption column filled with 2.0g chromium-containing leather waste (diameter 11mm, height 280mm) was employed, the breakthrough point of lOOmg/L SDBS solution was at 150 bed volumes. For the direct pink 12B, direct orange, acid flavine G and acid ATT solutions with initial concentration of lOOOmg/L, the breakthrough points were 40, 21, 30 and 35 bed volumes, respectively. Desorption studies showed that only 90% of anionic dyes and SDBS adsorbed on adsorption column could be desorbed by using 0.1mol/LNaHCO3. The method of desorbing dyes and surfactant needs to be further studied.更多还原