碳纳米管改性聚合氯化铝处理腐殖酸溶液研究

发布时间：2018-04-19 19:40

本文选题：碳纳米管 + 聚合氯化铝　；参考：《中国给水排水》2015年23期

【摘要】：碳纳米管由于其特殊的吸附性能,对在天然水体中广泛存在的腐殖酸(HA)具有良好的吸附性,可用于腐殖酸的去除。对不同DOC含量和p H值条件下碳纳米管吸附去除腐殖酸以及使用碳纳米管改性聚合氯化铝(PACl)作混凝剂时混凝过程中絮体的形成与破碎进行了研究。结果表明:当水样DOC为4 mg/L、p H值为7.5时,使用不加碳纳米管的PACl作混凝剂,投加量为0.1 mmol/L时沉后水DOC浓度达到最低。碳纳米管对腐殖酸的吸附去除率随p H值的升高而下降,随碳纳米管含量的增加而增加,吸附主要发生在前60 min内。随着DOC含量的升高,混凝过程对DOC的去除率下降。当p H值为7.5、DOC为2 mg/L时,碳纳米管含量对于平衡时絮体的粒径无明显影响,但可以增加再生长后絮体粒径,改善絮体的沉降性,提高混凝效果。
[Abstract]:Because of its special adsorption properties, carbon nanotubes (CNTs) have good adsorbability to humic acid (HA) widely existing in natural water, and can be used to remove humic acid. The formation and breakage of flocs in the coagulation process of carbon nanotubes (CNTs) by adsorption and removal of humic acid under different DOC contents and pH values and the use of carbon nanotubes (CNTs) modified polyaluminum chloride (PACL) as coagulant were studied. The results show that when the DOC of water sample is 4 mg / L ~ (-1) H = 7.5, the concentration of DOC in precipitated water is the lowest when the PACl without carbon nanotubes is used as coagulant and the dosage is 0.1 mmol/L. The removal rate of humic acid by carbon nanotubes decreased with the increase of pH and increased with the increase of carbon nanotubes content. The adsorption mainly occurred in the first 60 min. With the increase of DOC content, the removal rate of DOC decreased during coagulation. When pH value was 7.5? DOC = 2 mg/L, the content of carbon nanotubes had no obvious effect on the particle size of the flocs in equilibrium, but it could increase the particle size of the floc after growth, improve the sedimentation of the floc and improve the coagulation effect.
【作者单位】：中国科学院生态环境研究中心环境水质学国家重点实验室;
【基金】：国家自然科学基金杰出青年基金资助项目(51025830);国家自然科学基金青年基金资助项目(51008293、51578527、41201498);国家自然科学基金资助重点项目(51138008)
【分类号】：TU991.2

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