Determination of CMC-Cu<sup>2+</sup> stability constant and analysis of CMC chelate copper ion effect

FENG Ying; WANG Juecheng; ZHENG Longxing; SU Chenchang; ZHANG Jianwei

doi:10.11949/j.issn.0438-1157.20150517

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Determination of CMC-Cu²⁺ stability constant and analysis of CMC chelate copper ion effect

更新时间：2025-12-10

- Determination of CMC-Cu²⁺ stability constant and analysis of CMC chelate copper ion effect
- CIESC Journal Issue 11, Pages: 4501-4508(2015)
- 作者机构：
  
  沈阳化工大学能源与动力工程学院,辽宁,沈阳,110142
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150517
  CLC： Q028
- Online First：05 November 2015，
  
  Published：05 November 2015
- 稿件说明：
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FENG Ying, WANG Juecheng, ZHENG Longxing, et al. Determination of CMC-Cu²⁺ stability constant and analysis of CMC chelate copper ion effect[J]. CIESC Journal, 2015, (11): 4501-4508. DOI: 10.11949/j.issn.0438-1157.20150517.
DOI：

FENG Ying, WANG Juecheng, ZHENG Longxing, et al. Determination of CMC-Cu²⁺ stability constant and analysis of CMC chelate copper ion effect[J]. CIESC Journal, 2015, (11): 4501-4508. DOI: 10.11949/j.issn.0438-1157.20150517. DOI：

摘要

为了考察羧甲基纤维素钠(CMC)对重金属离子的螯合能力

利用紫外分光光度法测定了不同c(Cu2+)/c(—COO-)浓度比下CMC与形成螯合物的吸收光谱

探讨了螯合物的组成

并计算其稳定常数。结果表明:CMC对有螯合作用

当c(Cu2+)/c(—COO-)小于0.6

螯合物在237 nm处出现最大吸收峰

—COO-为主要配体

与按物质的量比为2:1进行螯合

此时

螯合物稳定常数为1.88×1010;c(Cu2+)/c(—COO-)为0.6～1.0时

214、237 nm处出现最大吸收峰

—COO-、—OH都参与螯合反应并形成新的螯合物;c(Cu2+)/ c(—COO-)大于1.0时

214 nm存在最大吸收峰

—OH为主要配体。考察了利用CMC螯合去除溶液中的效果

实验表明

CMC-Cu螯合物可在溶液中直接析出

析出物为絮状沉淀。当c(Cu2+)/c(—COO-)等于0.5时为最佳CMC用量

此时上清液中去除率可以达到96%以上。

Abstract

In order to investigate chelating ability of sodium carboxymethyl cellulose (CMC) on copper ions

the absorption spectra of the copper ion complex with CMC were measured via ultraviolet spectrophotometry. The composition of the complex was discussed and its stability constants were calculated. The experimental results show that CMC exhibits adsorption peak at 196 nm. When c(Cu2+)/c(—COO-) is less than 0.6

the absorption peak of the complex appears at 237 nm

—COO- group of CMC is the main ligand and reacts with Cu2+ in a molar ratio of 2:1 to form complex CMC-Cu2+

and the complex stability constant is 1.88×1010. When c(Cu2+)/c(—COO-) is from 0.6 to 1.0

the maximum absorption peak of the complex appears at 214

237 nm. —COO- and —OH are involved in the complexation reaction to form a new complex. When c(Cu2+)/c(—COO-) is greater than 1.0

the maximum absorption is in 214 nm and —OH is the primary ligand. The paper also investigates the removal effect of Cu2+ by CMC chelating. Experiments show that CMC-Cu directly precipitates to complexes in the solution

with precipitates as floc. c(Cu2+)/c(—COO-) of 0.5 is the optimal usage of CMC in the supernatant

and the removal rate of Cu2+ can reach above 96%.

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Determination of CMC-Cu2+ stability constant and analysis of CMC chelate copper ion effect

DOI：10.11949/j.issn.0438-1157.20150517

摘要

Abstract

关键词

Keywords

references

Determination of CMC-Cu²⁺ stability constant and analysis of CMC chelate copper ion effect