铁锰复合氧化物对镉离子吸附特征及影响因子研究

王法,袁林,宋娇艳,曾微,王强,木志坚,倪九派

doi:10.13718/j.cnki.xsxb.2016.07.008

西南师范大学学报(自然科学版)

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
	姓名不能为空！
邮箱
	邮箱不能为空！非法的邮箱地址。
手机号码
	电话不能为空！请输入有效手机号!
标题
	标题不能为空！
留言内容
	内容不能为空！
验证码
	验证码不能为空！验证码错误！

铁锰复合氧化物对镉离子吸附特征及影响因子研究

王法,袁林,宋娇艳,曾微,王强,木志坚,倪九派. 铁锰复合氧化物对镉离子吸附特征及影响因子研究[J]. 西南师范大学学报(自然科学版), 2016, 41(7). doi: 10.13718/j.cnki.xsxb.2016.07.008

引用本文:

WANG Fa,YUAN Lin,SONG Jiao-yan,ZENG Wei,WANG Qiang,MU Zhi-jian,NI Jiu-pai. On Characteristics of Isothermal Adsorption of Cd2+ to Fe-Mn Bimetal Oxide and Its Influencing Factors[J]. Journal of Southwest China Normal University(Natural Science Edition), 2016, 41(7). doi: 10.13718/j.cnki.xsxb.2016.07.008

Citation:

WANG Fa,YUAN Lin,SONG Jiao-yan,ZENG Wei,WANG Qiang,MU Zhi-jian,NI Jiu-pai. On Characteristics of Isothermal Adsorption of Cd2+ to Fe-Mn Bimetal Oxide and Its Influencing Factors[J]. Journal of Southwest China Normal University(Natural Science Edition), 2016, 41(7). doi: 10.13718/j.cnki.xsxb.2016.07.008

铁锰复合氧化物对镉离子吸附特征及影响因子研究

王法,袁林,宋娇艳,曾微,王强,木志坚,倪九派

西南大学资源环境学院/教育部三峡库区生态环境重点实验室/重庆市农业资源与环境研究重点实验室,重庆,400716 ; 德阳市环境监测站,四川德阳,618000 ; 西南计算机有限责任公司,重庆,400060

On Characteristics of Isothermal Adsorption of Cd2+ to Fe-Mn Bimetal Oxide and Its Influencing Factors

WANG Fa,YUAN Lin,SONG Jiao-yan,ZENG Wei,WANG Qiang,MU Zhi-jian,NI Jiu-pai

摘要: 采用等温吸附法研究了铁锰复合氧化物在不同p H值、离子强度、温度条件下对C d2＋的吸附行为及其特征．研究表明：铁锰复合氧化物吸附Cd2＋性能较好，吸附率最高达85.23％；等温吸附模型Langmuir方程较Freundli‐ch方程拟合效果更好；离子强度和温度相同时，铁锰复合氧化物在pH 4.0～8.0范围内对Cd2＋最大吸附量 Qmax和吸附平衡常数 K均随pH值升高而增大；相同pH值和温度下，铁锰复合氧化物对Cd2＋吸附量随离子强度升高亦增大；35℃时的吸附量均大于25℃时，表明升高温度有利于铁锰复合氧化物对Cd2＋的吸附，且两温度下热力学参数标准Gibbs自由能变△Gθm ＜0，焓变△ Hθ＞0，熵变△ Sθ＞0，表明吸附反应是自发且吸热的，升高温度促进反应进行．
- 铁锰复合氧化物 /
- Cd2+ /
- 吸附 /
- 热力学
Abstract: The characteristics of adsorption and the thermodynamic characteristics of Cd2+ to Fe‐Mn bimet‐al oxides (FMO) ,the effect of pH ,ionic strength ,temperature have been studied with isothermal adsorp‐tion method .The results indicate that Fe‐Mn bimetal oxide has a strong adsorbability for Cd2+ ,with a maximum adsorption rate of 85 .23% .The adsorption isotherms fit fairly with Langmuir equation ,fol‐lowed closely by the Freundlich equation .The maximum adsorption amount (Qmax ) and adsorption equilib‐rium constant (K) are both increased with pH increasing from 4 .0 to 8 .0 ,under same conditions of ion strength and temperature .When ion strength changes from 0 to 0 .10 mol/L ,the adsorption amounts are also increased while temperature and pH were same .The thermodynamic parameters show that ,with in‐creased temperature ,adsorption amounts are increased ,the standard Gibbs free energy ΔGθm are positive , w hile the thermodynamic enthalpy change ΔHθ and entropy change ΔSθare negative w hen temperature are in the range of 25℃ to 35℃ ,w hich indicate that the adsorbing reaction is a endothermic and spontaneous process and increasing temperature is liable to promote adsorption reaction .
- Fe-Mn bimetal oxides (FMO)；Cd2+ ion；adsorption；thermodynamic parameters /

计量

文章访问数: 608
HTML全文浏览数: 451
PDF下载数: 0
施引文献: 0

铁锰复合氧化物对镉离子吸附特征及影响因子研究

王法,袁林,宋娇艳,曾微,王强,木志坚,倪九派

西南大学资源环境学院/教育部三峡库区生态环境重点实验室/重庆市农业资源与环境研究重点实验室,重庆,400716 ; 德阳市环境监测站,四川德阳,618000 ; 西南计算机有限责任公司,重庆,400060

关键词:

铁锰复合氧化物 /
Cd2+ /
吸附 /
热力学

摘要: 采用等温吸附法研究了铁锰复合氧化物在不同p H值、离子强度、温度条件下对C d2＋的吸附行为及其特征．研究表明：铁锰复合氧化物吸附Cd2＋性能较好，吸附率最高达85.23％；等温吸附模型Langmuir方程较Freundli‐ch方程拟合效果更好；离子强度和温度相同时，铁锰复合氧化物在pH 4.0～8.0范围内对Cd2＋最大吸附量 Qmax和吸附平衡常数 K均随pH值升高而增大；相同pH值和温度下，铁锰复合氧化物对Cd2＋吸附量随离子强度升高亦增大；35℃时的吸附量均大于25℃时，表明升高温度有利于铁锰复合氧化物对Cd2＋的吸附，且两温度下热力学参数标准Gibbs自由能变△Gθm ＜0，焓变△ Hθ＞0，熵变△ Sθ＞0，表明吸附反应是自发且吸热的，升高温度促进反应进行．

English Abstract

On Characteristics of Isothermal Adsorption of Cd2+ to Fe-Mn Bimetal Oxide and Its Influencing Factors

西南大学资源环境学院/教育部三峡库区生态环境重点实验室/重庆市农业资源与环境研究重点实验室,重庆,400716 ; 德阳市环境监测站,四川德阳,618000 ; 西南计算机有限责任公司,重庆,400060

Keywords:

Abstract: The characteristics of adsorption and the thermodynamic characteristics of Cd2+ to Fe‐Mn bimet‐al oxides (FMO) ,the effect of pH ,ionic strength ,temperature have been studied with isothermal adsorp‐tion method .The results indicate that Fe‐Mn bimetal oxide has a strong adsorbability for Cd2+ ,with a maximum adsorption rate of 85 .23% .The adsorption isotherms fit fairly with Langmuir equation ,fol‐lowed closely by the Freundlich equation .The maximum adsorption amount (Qmax ) and adsorption equilib‐rium constant (K) are both increased with pH increasing from 4 .0 to 8 .0 ,under same conditions of ion strength and temperature .When ion strength changes from 0 to 0 .10 mol/L ,the adsorption amounts are also increased while temperature and pH were same .The thermodynamic parameters show that ,with in‐creased temperature ,adsorption amounts are increased ,the standard Gibbs free energy ΔGθm are positive , w hile the thermodynamic enthalpy change ΔHθ and entropy change ΔSθare negative w hen temperature are in the range of 25℃ to 35℃ ,w hich indicate that the adsorbing reaction is a endothermic and spontaneous process and increasing temperature is liable to promote adsorption reaction .