复配修饰黏土对四环素的吸附及其应用探究

分别采用十二烷基三甲基溴化铵(DTAB)和十二烷基磺酸钠(SDS)对十二烷基二甲基甜菜碱(BS-12)修饰高岭土(K)进行复配修饰,以批处理法探究其对紫色土(PS)吸附四环素(TC)的影响。结果表明:TC吸附是自发、吸热和熵增的反应,各供试材料对TC的吸附均符合Langmuir模型,且相同条件下60%复配修饰效果更佳。各供试材料对TC的吸附量均随着温度和pH值的升高而增加(除PS/K_60%BS+60%SD外)。当温度为20℃,pH值为5,离子浓度为0.1 mol/L时,吸附量达到最大值5.64 mmol/kg~42.7 mmol/kg。

Study on the Adsorption of Tetracycline by Composite Modified Clay and Its Application

Dodecyl dimethyl betaine(BS-12)modified kaolin(K)was modified by dodecyl trimethylammonium bromide(DTAB)and sodium dodecyl sulfonate(SDS)respectively,then was added to purple soil for adsorbing tetracycline(TC)by batch method.The results showed that the adsorption of TC was spontaneous,endothermic and entropy-increasing reactions.The adsorption of each test material was consistent with Langmuir model,and 60%of the modification had better effect under the same conditions.The adsorption of TC by all the test materials increased with the increase of temperature and pH value(except PS/K_60%BS+60%SD).When the temperature was 20℃,pH value was 5 and the ion concentration was 0.1 mol/L,the adsorption capacity reached a maximum which was between 5.64 mmol/kg and 42.7 mmol/kg.