【摘要】 以二甲基亚砜、过氧化氢和氨丙基三甲氧基硅烷为原料,通过化学沉淀法合成氨基改性高岭土,开展了改性前后高岭石对Pb(Ⅱ)的吸附试验研究。研究表明,氨基改性后高岭土吸附速率较快,120 min后便趋于平衡;pH值对吸附效果影响较大,酸性水体条件下pH值与吸附效率呈正相关关系;在吸附剂含量一定时,随着Pb(Ⅱ)起始浓度的增加,吸附剂的有效比表面积减小,吸附效率降低。高岭土改性处理后其吸附效率和吸附容量显著提高,改性效果良好。更多还原

【Abstract】 Dimethyl sulfoxide, hydrogen peroxide and aminopropyl trimethoxysilane were used as raw materials to synthesize amino-modified kaolin by chemical precipitation. The adsorption test of Pb(Ⅱ) on kaolinite before and after modification was carried out. Studies showed that the amino acid modified kaolin had a faster adsorption rate and tended to equilibrium after 120 minutes, and pH had a significant effect on the adsorption effect. Under acidic water conditions, the pH had a positive correlation with the adsorption efficiency. As the initial concentration of Pb(Ⅱ) increased, the effective specific surface area of the adsorbent decreased and the adsorption efficiency decreased. After modification, the adsorption capacity of kaolin was significantly improved, and the modification effect was good.更多还原