利用天然浓缩丹宁合成新型凝胶吸附剂通过表面沉淀去除水溶液中铅

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利用天然浓缩丹宁合成新型凝胶吸附剂通过表面沉淀去除水溶液中铅

占新民^a; 赵璇^b; AKANE Miyazaki^c; YOSHIO Nakano^c

^aState Key Joint Laboratory on Environment Simulation and Pollution Control, Department of
Environmental Science and Engineering, Tsinghua University, Beijing 100084, China
^b Section of Environmental Technology, Institute of Nuclear Energy Technology, Tsinghua
University, Beijing 100084, China
^c Department of Environmental Chemistry and Engineering,Interdisciplinary Graduate School
of Science and En- gineering, Tokyo Institute of Technology, Nagatsuta 4259, Midori-ku,
Yokohama 226-8502, Japan

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2003-08-28 发布日期:2003-08-28
通讯作者: 占新民

Lead Removal from Aqueous Solutions Using Novel Gel Adsorbent Synthesized from Natural
Condensed Tannin

ZHAN Xinmin^a; ZHAO Xuan^b; AKANE Miyazaki^c; YOSHIO Nakano^c

^a State Key Joint Laboratory on Environment Simulation and Pollution Control, Department of
Environmental Science and Engineering, Tsinghua University, Beijing 100084, China
^b Section of Environmental Technology, Institute of Nuclear Energy Technology, Tsinghua
University, Beijing 100084, China
^c Department of Environmental Chemistry and Engineering,Interdisciplinary Graduate School
of Science and En- gineering, Tokyo Institute of Technology, Nagatsuta 4259, Midori-ku,
Yokohama 226-8502, Japan

Received:1900-01-01 Revised:1900-01-01 Online:2003-08-28 Published:2003-08-28
Contact: ZHAN Xinmin

摘要/Abstract

摘要： Lead has caused serious environmental pollution due to its toxicity, accumulation in food
chains andpersistence in nature. In this paper, removal of lead from aqueous solutions is
investigated using a novel geladsorbent synthesized from natural condensed tannin. The
novel adsorbent performs in aqueous solutions as a weakbase with valid basic groups of 1.2
mmol.g-1 tannin gel particles and therefore results in the elevation of pH valueof aqueous
solutions. Even when initial pH is 3.6, final pH at equilibrium can climb up to 6.5 that is
above the pHvalue for Pb(OH)2 precipitation formation and then lead can be removed from
wastewater by this so-called surfaceprecipitation. The adsorption isotherm can be expressed
by the Langmuir equation and the maximum capacity foradsorption of Pb is up to 92mg.g-1
(based on dry adsorbent) when initial pH value is 3.6. Hence, the adsorbentdoes offer
favorable properties in lead removal with respect to its high adsorption capacity at low
initial pH value,which is advantageous to lead removal from acidic wastewater. A model is
put forward to describe the individualadsorption phenomenon of the tannin gel adsorbent.

关键词: condensed tannin;lead removal;surface precipitation;tannin gel adsorbent

Abstract: Lead has caused serious environmental pollution due to its toxicity, accumulation in food
chains andpersistence in nature. In this paper, removal of lead from aqueous solutions is
investigated using a novel geladsorbent synthesized from natural condensed tannin. The
novel adsorbent performs in aqueous solutions as a weakbase with valid basic groups of 1.2
mmol.g-1 tannin gel particles and therefore results in the elevation of pH valueof aqueous
solutions. Even when initial pH is 3.6, final pH at equilibrium can climb up to 6.5 that is
above the pHvalue for Pb(OH)2 precipitation formation and then lead can be removed from
wastewater by this so-called surfaceprecipitation. The adsorption isotherm can be expressed
by the Langmuir equation and the maximum capacity foradsorption of Pb is up to 92mg.g-1
(based on dry adsorbent) when initial pH value is 3.6. Hence, the adsorbentdoes offer
favorable properties in lead removal with respect to its high adsorption capacity at low
initial pH value,which is advantageous to lead removal from acidic wastewater. A model is
put forward to describe the individualadsorption phenomenon of the tannin gel adsorbent.

Key words: condensed tannin, lead removal, surface precipitation, tannin gel adsorbent

占新民, 赵璇, AKANE Miyazaki, YOSHIO Nakano. 利用天然浓缩丹宁合成新型凝胶吸附剂通过表面沉淀去除水溶液中铅[J]. CIESC Journal.

ZHAN Xinmin, ZHAO Xuan, AKANE Miyazaki, YOSHIO Nakano. Lead Removal from Aqueous Solutions Using Novel Gel Adsorbent Synthesized from Natural
Condensed Tannin[J]. .

参考文献

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利用天然浓缩丹宁合成新型凝胶吸附剂通过表面沉淀去除水溶液中铅

Lead Removal from Aqueous Solutions Using Novel Gel Adsorbent Synthesized from Natural
Condensed Tannin

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利用天然浓缩丹宁合成新型凝胶吸附剂通过表面沉淀去除水溶液中铅

Lead Removal from Aqueous Solutions Using Novel Gel Adsorbent Synthesized from Natural Condensed Tannin

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Lead Removal from Aqueous Solutions Using Novel Gel Adsorbent Synthesized from Natural
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