摘要
为改性煤系高岭土,以原矿煤系高岭土和硫酸钛为原料,采用水热法合成TiO_2-煤系高岭土纳米复合物,并研究其对有机染料的吸附性能。结果表明,当染料质量浓度为100 mg/L、吸附液体积为20mL、吸附剂用量为50mg、吸附时间为60min、溶液pH=12时,TiO_2-煤系高岭土纳米复合物对阳离子型染料次甲基蓝的吸附率达到95. 5%,对阴离子型染料刚果红在中性条件下的吸附率达到98. 0%,分别比原矿提高30%和24%;复合物对2种染料的吸附均符合准二级吸附动力学模型,同时也符合Langmuir吸附等温式,属于单分子层吸附。
TiO_2-coal-bearing kaolinite nanocomposites were synthesized by a hydrothermal method using coal-bearing kaolinite(CBK) and titanium sulfate as raw materials,and their adsorption abilities for organic dyes were investigated. The results show that the adsorption rate of methylene blue(MB) and Congo red(CR) reached 95.5% and 98.0% at C_0=100 mg/L,V =20mL,m =50mg,and contact time =60min,when the solution pH values are 12 and 7,respectively.After modification with TiO_2,the adsorption rate of MB and CR increased by 30% and 24% with respect to original CBK. The dye-adsorption kinetics fit well the pseudo-second order rate equation,while the adsorption isotherm data can best be described by Langmuir adsorption model.
引文
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