Copper(II) Adsorptive Removal from Solutions with Sunflower Straw-modified by Phosphoric Acid

被引：0
作者：
Chen, Liping [1 ]
Duan, Yiwen [1 ]
Zhang, Jingxia [1 ]
机构：
[1] Inner Mongolia Normal Univ, Coll Chem & Environm Sci, Hohhot 010022, Peoples R China
来源：
ADVANCES IN ENVIRONMENTAL SCIENCE AND ENGINEERING, PTS 1-6 | 2012年 / 518-523卷
关键词：
Adsorption; Sunflower straw; Active carbon; Copper; Thermodynamics; CU(II) IONS; HEAVY-METAL; BEHAVIOR; WASTE;
D O I：
10.4028/www.scientific.net/AMR.518-523.159
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Straw active carbon was manufactured from sunflower straw by phosphoric acid. The adsorption was studied by considering the effects of various parameters on the removal rate of Cu2+ such as the dosage of absorbent, adsorption time, temperature and pH. The results showed that the absorbent was efficient, the removal ratio of Cu2+ up to 98.3% with an adsorbent dosage of 16 g-L-1, a pH of 6.0, at 25 degrees C and absorption time of 4 hours. The Langmuir and Freundlich equations can describe the adsorption equilibrium well. The negative values of the adsorption enthalpy Delta(H) and the absolute values>42 kJ.mol(-1) indicate the exothermic chemical adsorption character. The negative changes in free energy (Delta(G)) indicate that the adsorption is a spontaneous process, The negative values of the adsorption entropy Delta(S) indicate the more restricted mobility of the Cu2+ on the carbon surface than in solution.
引用
收藏
页码：159 / 163
页数：5
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