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重金属离子与方解石表面反应的实验研究
Experimental Study on the Surface Reactions of Heavy Metal Ion with Calcit
  修订日期:1999-03-30
中文关键词:表面反应 反应模式 重金属离子 方解石
英文关键词:surface reactions  reaction models  heavy metal ions  calcite
基金项目:国家自然科学基金项目(49572091)资助
作者单位
吴宏海  
吴大清  
彭金莲  
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中文摘要:
      本文对重金属离子与方解石表面反应作了系统研究。方解石表面对重金属离子的 吸附等温线可分为4种类型:A型,Langmuir型;B型,Freudlich型;C型,吸附-沉淀突变型;D 型,吸着线性型。实验研究表明,方解石表面反应多种模式并存。Cu2+、Zn2+、Cd2+和Ni2+在低 浓度时表现为离子交换吸附,较高浓度时表现为交换和表面配位吸附并存,而高浓度时则表现为 表面沉淀;Ag+、Pb2+和Cr3+在低浓度时表现为表面配位吸附,而较高浓度时则表现为表面沉淀。
英文摘要:
      The sorption mass of such metal ions as Ag+, Cr3+, Cu2+, Pb2+, Zn2+, Cd2+and Ni2+ on calcite surfaces are measured by atomic absorption spectroscopy (AAS) as a function of metal ion concentration at temperature of 30℃and ion strength ofI=0.1 mol/L. The surface reaction isotherms can be classified into four types, viz.: A_type, adsorption isotherm of Langmuir (Ag+); B_type, adsorption isotherm of Freudlich (Cd2+, Ni2+); C_type, adsorption_copre_cipitation isotherm with saltation (Cu2+, Zn2+); D_type, linear sorption isotherm (Cr3+, Pb2+). The species of Ag+sorbed on calcite surface is of the form of >CO3Ag with very small surface coverage,NMex=0.01. The species of Cd2+and Ni2+sorbed on calcite surface are sin- gle nuclear complexation (>CO3MOH),NMex<0.1, or multi_nuclear complexation, 0.1< NMex<1, and subordinately single nuclear complexation (>CO3MOH); the surface species of Cu2+, Zn2+and Ni2+are precipitation products under the condition of high concentration. The species of Pb2+and Cr3+sorbed on calcite surface are mainly precipitation products and subordinately adsorption complexation products at low concentration,NMex≤0.08. The experimental results show that multi-models coexist in the surface reactions of heavy metal ions with calcite. The sorption behavior of the sorbed cations such as Cd2+, Cu2+, Zn2+ and Ni2+on calcite can be modeled by surface exchange reaction at low concentration of metal ions; they can be modeled by both surface complexation and exchange reaction, or by precipitation at high concentration of metal ions. Surface complexation or precipitation can be used to model the sorption behavior of such sorbed cations as Ag+, Pb2+ and Cr3+ on calcite.
吴宏海,吴大清,彭金莲,1999,重金属离子与方解石表面反应的实验研究[J].岩石矿物学杂志,18(4):301~308.
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