Cadmium adsorption mechanism of Serratia marcescens HB-4

CHEN Yakui; XU Canran; ZHU Qifa; HUANG Weiwei; LU Diannan; DONG Jianjiang; LIU Yongmin

doi:10.11949/j.issn.0438-1157.20161427

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Cadmium adsorption mechanism of Serratia marcescens HB-4

更新时间：2025-12-10

- Cadmium adsorption mechanism of Serratia marcescens HB-4
- CIESC Journal Issue 4, Pages: 1574-1581(2017)
- 作者机构：
  
  1. 辽宁石油化工大学化学化工与环境学院,辽宁,抚顺,113001
  2. 清华大学化学工程系,北京,100084
  3. 安徽皖南烟叶责任有限公司,安徽,宣城,242000
  4. 中国烟草总公司安徽省公司,安徽,合肥,230022
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161427
  CLC： 52
- Online First：05 April 2017，
  
  Published：05 April 2017
- 稿件说明：
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CHEN Yakui, XU Canran, ZHU Qifa, et al. Cadmium adsorption mechanism of Serratia marcescens HB-4[J]. CIESC Journal, 2017, (4): 1574-1581.
DOI：

CHEN Yakui, XU Canran, ZHU Qifa, et al. Cadmium adsorption mechanism of Serratia marcescens HB-4[J]. CIESC Journal, 2017, (4): 1574-1581. DOI： 10.11949/j.issn.0438-1157.20161427.

摘要

从重金属污染土壤中筛选出1株对Cd2+具有高耐受能力和高吸附容量的菌株HB-4，经16S rDNA序列分析鉴定为粘质沙雷氏菌（Serratia marcescens）。该菌株能在Cd2+浓度为300 mg·L-1的条件下正常生长；对Cd2+的最大吸附量为（154.7±0.9（ mg·g-1。考察了Cd2+初始浓度、pH、盐浓度以及共存离子对HB-4吸附Cd2+的影响，结果表明：pH=3.0~8.0时，对吸附效果无影响；NaCl含量为8.0%时，菌株对Cd2+的去除率仍可达到49.9%±0.1%；Pb2+、Zn2+、Cu2+与Cd2+共存时，几种重金属离子的去除率分别为98.7%±0.2%（Pb2+）、44.6%±0.6%（Zn2+）、52.7%±0.1%（Cu2+）和64.2%±0.3%（Cd2+）。解吸实验证明了HB-4对Cd2+极强的吸附能力，洗脱液pH=7.0时，解吸率小于2%。检测了细胞内外镉的分布情况，并利用SEM、XPS和FTIR对吸附机理进行了研究，推断HB-4对Cd2+的吸附机理为胞外吸附和胞内摄取。

Abstract

The strain HB-4 was screened from heavy metal contaminated soil

identified as Serratia marcescens via 16S rDNA sequence analysis

and had a strong tolerance for Cd2+. This strain can grow well when the concentration of Cd2+ was up to 300 mg·L-1 and in that case the maximum adsorption capacity of Cd2+ was (154.7±0.9) mg·g-1. The effect factors of the adsorption of Cd2+ by using HB-4 were investigated

including the initial concentration of Cd2+

salt concentration and coexisting ions. The results showed that there was no difference in the adsorption capacity when pH was ranged from 3.0 to 8.0. The same results can also be obtained at 8.0% NaCl solution and the removal efficiency were 98.7%±0.2% (Pb2+)

44.6%±0.6% (Zn2+)

52.7%±0.1% (Cu2+) and 64.2%±0.3% (Cd2+)

respectively

when Pb2+

Zn2+

Cu2+ and Cd2+ coexisted in solution. According to desorption experiment

the desorption rate was less than 2% and it demonstrated that HB-4 performed the best on adsorption of Cd2+. The distribution of intra-and extracellular cadmium was studied

as well as the results from SEM

XPS and FTIR. It suggested that the mechanism of adsorption of Cd2+ by HB-4 contained extracellular adsorption and intracellular uptake.

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