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TiO2-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20 mL、吸附剂用量为50 mg、吸附时间为60 min、溶液pH=12时，TiO2-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。
关键词：煤系高岭土；TiO2-煤系高岭土纳米复合物；吸附；次甲基蓝；刚果红
Abstract: TiO2－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 C0= 100 mg /L，V= 20 mL，m = 50 mg，and contact time = 60 min，when the solution pH values are 12 and 7，respectively．After modification with TiO2，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．
Keywords: coal-bearing kaolinite; TiO2－coal-bearing kaolinite nanocomposites; adsorption; methylene blue; congo red
