Adsorption of phosphate on magnetite-goethite mix phase

SHAO Penghui; TANG Chaochun; JIAN Meipeng

doi:10.3969/j.issn.0438-1157.2013.05.041

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Adsorption of phosphate on magnetite-goethite mix phase

更新时间：2025-12-10

- Adsorption of phosphate on magnetite-goethite mix phase
- CIESC Journal Issue 5, Pages: 1803-1809(2013)
- 作者机构：
  
  华东交通大学土木建筑学院,江西,南昌,330013
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.05.041
  CLC： 52
- Online First：05 May 2013，
  
  Published：05 May 2013
- 稿件说明：
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SHAO Penghui, TANG Chaochun, JIAN Meipeng. Adsorption of phosphate on magnetite-goethite mix phase[J]. CIESC Journal, 2013, (5): 1803-1809.
DOI：

SHAO Penghui, TANG Chaochun, JIAN Meipeng. Adsorption of phosphate on magnetite-goethite mix phase[J]. CIESC Journal, 2013, (5): 1803-1809. DOI： 10.3969/j.issn.0438-1157.2013.05.041.

摘要

采用废弃贴式取暖物(商业名为热力贴)为原料制得一种吸附剂

通过静态批式实验考查了pH与吸附效果、zeta电位、离子强度等因素间的相互作用规律

探讨了不同pH下该吸附剂去除水中磷酸盐的机理。结果表明

该吸附剂的物相以磁铁矿-针铁矿混合相(magnetite-goethite mix phase

MGM)为主

其对水中磷酸盐的吸附等温线符合Langmuir方程。当温度为25℃

pH=2时

其饱和吸附量达12.57 mg·g-1。研究还表明

磷在MGM上的吸附受溶液pH主导。pH较低时

内层络合

静电吸引

表面直接沉淀驱动磷的吸附;pH较高时

静电吸引渐变为静电排斥

内层络合减弱

不利于磷的吸附

而内层络合共吸附、表面间接沉淀促进了磷的吸附

但两者作用的综合结果表现为除磷效果下降。

Abstract

An adsorbent was first prepared from used hot pack

and adsorption of phosphate on it studied. The interaction between pH

adsorption performance and zeta potential was also investigated and the adsorption mechanism at different pH values did.The results showed that the adsorbent were mainly composed of mix phases of magnetite and goethite.The isotherm of phosphate adsorption could be well described by Langmuir equation.The capacity of its equilibrium adsorption was 12.57 mg·g-1 at temperature 25℃ and pH 2.The studies also indicated that adsorption of phosphate on the adsorbent was dominated by solution pH.Inner-sphere complexing

electrostatic attraction and direct precipitation on surface were jointly driving force for adsorption of phosphorus at lower pH.At higher pH

inner-sphere complexing decreased and electrostatic attraction became electrostatic exclusion

which was unfavorable for phosphate adsorption

however

co-adsorption with inner-sphere complexing and indirect precipitation on surface promoted adsorption of phosphate

and total effect is decline of phosphorous removal.

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