Adsorption mechanism of Cd<sup>2+</sup> ions in wastewater by corncob graftedwith methacrylic acid

LIN Hai; XU Jinmo; DONG Yingbo; WANG Liang; ZHOU Yihua; XU Weijuan

doi:10.11949/j.issn.0438-1157.20150507

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Adsorption mechanism of Cd²⁺ ions in wastewater by corncob graftedwith methacrylic acid

更新时间：2025-12-10

- Adsorption mechanism of Cd²⁺ ions in wastewater by corncob graftedwith methacrylic acid
- CIESC Journal Issue 11, Pages: 4509-4519(2015)
- 作者机构：
  
  1. 北京科技大学土木与环境工程学院,北京,100083
  2. 工业典型污染物资源化处理北京市重点实验室,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150507
  CLC： 712
- Online First：05 November 2015，
  
  Published：05 November 2015
- 稿件说明：
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LIN Hai, XU Jinmo, DONG Yingbo, et al. Adsorption mechanism of Cd²⁺ ions in wastewater by corncob graftedwith methacrylic acid[J]. CIESC Journal, 2015, (11): 4509-4519. DOI: 10.11949/j.issn.0438-1157.20150507.
DOI：

LIN Hai, XU Jinmo, DONG Yingbo, et al. Adsorption mechanism of Cd²⁺ ions in wastewater by corncob graftedwith methacrylic acid[J]. CIESC Journal, 2015, (11): 4509-4519. DOI: 10.11949/j.issn.0438-1157.20150507. DOI：

摘要

以甲基丙烯酸为单体、高锰酸钾/浓硫酸为引发体系对玉米芯进行接枝改性

成功引入羧基官能团

结合扫描电镜、红外光谱和zeta电位等分析手段研究了吸附条件对玉米芯吸附Cd2+过程的影响及其吸附机理。结果表明

吸附过程符合Langmuir模型和准二级动力学方程

改性玉米芯对Cd2+的吸附主要是化学吸附过程

吸附速率是颗粒内扩散速率和膜扩散速率共同影响的结果;在pH 7、投加量为5 g·L-1、温度为30℃、吸附时间为6 h的条件下

接枝改性玉米芯和原玉米芯对Cd2+的最大吸附容量分别为28.00 mg·g-1和5.96 mg·g-1

提高了近4倍;玉米芯对Cd2+的吸附是一个自发的吸热反应

温度越高

自发程度越大;接枝改性玉米芯对Cd2+的吸附过程中

参与反应的主要官能团有羧基、羟基、酰胺基和甲基等

吸附Cd2+后的接枝改性玉米芯表面出现褶皱和白色小颗粒

孔隙消失

电负性增大。

Abstract

To modify corncob by graft copolymerization

the methacrylic acid and a potassium permanganate- sulfuric acid redox system were used as monomer and initiator

carboxyl groups was introduced successfully. Scanning electron microscope (SEM)

Fourier transform infrared spectrometer (FTIR) and zeta potential analysis were used to characterize corncob and the effects of adsorption conditions on the adsorption of Cd2+ in aqueous solutions and its mechanism analyzed. The results showed that the experimental data obtained could be represented with a Langmuir isotherm

the adsorption rate followed pseudo-second-order kinetics and the rate-controlling step was the chemical sorption. Under certain conditions the adsorption rate was affected by both intra-particle and film diffusion rates. The maximal adsorption capacities of Cd2+ for methacrylic acid grafted and crude corncobs were 28.00 mg·g-1 and 5.96 mg·g-1

respectively

indicating improvement of nearly 4 times (adsorption conditions: pH 7

the dosage 5 g·L-1

temperature 30℃

adsorption time 6 h). The adsorption was a spontaneous endothermic process

the higher the temperature was

the greater the degree of spontaneous. During the process of adsorbing Cd2+

the groups on the surface of grafted corncob

including carboxyl

hydroxyl

amide and methyl groups could play important roles. It was found that there existed some wrinkles and white particles on the surface of grafted corncob after adsorbing Cd2+

and its porosity disappeared and electronegativity increased.

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Adsorption mechanism of Cd2+ ions in wastewater by corncob graftedwith methacrylic acid

DOI：10.11949/j.issn.0438-1157.20150507

摘要

Abstract

关键词

Keywords

references

Adsorption mechanism of Cd²⁺ ions in wastewater by corncob graftedwith methacrylic acid