在线阅读 --自然科学版 2008年5期《水锰矿吸附法去除水中Cr(Ⅲ)的研究》
水锰矿吸附法去除水中Cr(Ⅲ)的研究--[在线阅读]
李燕1, 于化江1,2, 孙振满1, 郑艳1, 马子川1
1. 河北师范大学化学与材料科学学院, 河北石家庄050016;
2. 沧州师范专科学校化学系, 河北沧州061001
起止页码: 649--652页
DOI:
摘要
以合成的水锰矿(γ-MnOOH)为吸附剂,研究了pH、吸附时间、投加量和质量浓度对Cr(Ⅲ)吸附去除效果的影响,并测定了吸附等温线.结果表明:吸附率-pH曲线呈"S"形,当Cr(Ⅲ)初始质量浓度为10mg/L时,发生吸附突跃的pH范围为3.3∼6.5,pH>6.5时容易出现Cr(OH)3沉淀;反应4h时达到吸附平衡;吸附去除率随吸附剂投加量的增加而提高;吸附等温线符合Langmuir方程,在25℃、吸附体系pH=5.0、ρ(吸附剂)为1g/L的条件下,γ-MnOOH对Cr(Ⅲ)的饱和吸附量为34.01 mg/g.
关键字: γ -MnOOH 吸附 Cr(Ⅲ)

Research on the Adsorption of Cr(Ⅲ)from Water by Manganite
LI Yan1, YU Hua-jiang1,2, SUN Zhen-man1, ZHENG Yan1, MA Zi-chuan1
1. College of Chemistry and Material Science, Hebei Normal University, Hebei Shijiazhuang 050016, China;
2. Department of Chemistry, Cangzhou Teacher’s College, Hebei Cangzhou 061001, China
Abstract:
With synthetic manganite (γ-MnOOH)as adsorbent,the adsorption of Cr(Ⅲ)was investigated as a function of pH ,adsorption time,adsorbent dosage and initial concent ration of Cr (Ⅲ),the adsorption isotherm was also determined.The results indicate that the pH-adso rption curve is of S shape,adsorption leaping occurs in the pH scale of 3.3∼6.5 at the ini tial concentratio n of 10mg/L,Cr(OH)3 precipitation is apt to occur when pH>6.5.It takes 4h to reach the adso rption equilibrium.The removal eff iciencies increase with the increase of adsorbent dosage.The adsorption iso thermal match to langmuir equation,and the maximum adsorption capacity of Cr(Ⅲ)onto γ-MnOOH is 34.01mg/gunder the temperature of 25℃,pH of 5.0 and adsorbent dosage of 1.0g/L.
Key words: γ; -MnOOH; adsorption; Cr(Ⅲ);

收稿日期: 2007-12-11
基金项目: 国家自然科学基金(20477009);河北省自然科学基金(E2005000183)

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