Cu2+ and Cd2+ adsorption by humic acids extracted from urban organic residues

Ciência Rural

Amaral Sobrinho, Moura Brasil do²  Canellas, Luciano Pasqualoto¹  Nelson, Gabriel de Araújo Santos²  Moraes, Anselmo Alpande²  Rumjamek, Victor Marcos² 

[1] Universidade Federal Rural do Rio de Janeiro, Seropédica;Universidade Federal Rural do Rio de Janeiro

关键词: heavy metals;    adsorption;    compost;    sewage sludge;   

DOI  :  10.1590/S0103-84781999000100005

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

Copper and cadmium adsorption by humic acids extracted from compost of municipal waste (AH-CRU) and sewage sludge (AH-LETE) was studied by adsorption isoterms at pH 5,5. High adsorption capacity by humic substances was verified and copper adsortion followed the LangmuirÂ’s model. The maximum copper adsorption was 55.5g of Cu2+kg-1 of AH-LETE and 45,9g Cu2+kg-1 of AH-CRU. The best model for cadmium adsorption was the FreundlichÂ’s model, and different sites of adsorption were observed by infrared spectroscopy. The main adsorption sites observed were COO-, OH and N-H.

【 授权许可】

CC BY-NC