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On-line Access: 2023-01-20

Received: 2022-07-14

Revision Accepted: 2022-08-18

Crosschecked: 2023-02-01

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Dong YE


Hai-ning WANG


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Journal of Zhejiang University SCIENCE A 2023 Vol.24 No.1 P.80-90


Mechanistic investigation on Hg0 capture over MnOx adsorbents: effects of the synthesis methods

Author(s):  Dong YE, Yongjin HU, Zhichang JIANG, Xin LIU, Haining WANG

Affiliation(s):  College of Quality & Safety Engineering, China Jiliang University, Hangzhou 310018, China

Corresponding email(s):   Richard32@126.com, whnfyy@163.com

Key Words:  Synthesis methods, Hg0 capture, MnOx, Acidity, Oxidative ability

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Dong YE, Yongjin HU, Zhichang JIANG, Xin LIU, Haining WANG. Mechanistic investigation on Hg0 capture over MnOx adsorbents: effects of the synthesis methods[J]. Journal of Zhejiang University Science A, 2023, 24(1): 80-90.

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author="Dong YE, Yongjin HU, Zhichang JIANG, Xin LIU, Haining WANG",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Mechanistic investigation on Hg0 capture over MnOx adsorbents: effects of the synthesis methods
%A Dong YE
%A Yongjin HU
%A Zhichang JIANG
%A Xin LIU
%A Haining WANG
%J Journal of Zhejiang University SCIENCE A
%V 24
%N 1
%P 80-90
%@ 1673-565X
%D 2023
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2200388

T1 - Mechanistic investigation on Hg0 capture over MnOx adsorbents: effects of the synthesis methods
A1 - Dong YE
A1 - Yongjin HU
A1 - Zhichang JIANG
A1 - Xin LIU
A1 - Haining WANG
J0 - Journal of Zhejiang University Science A
VL - 24
IS - 1
SP - 80
EP - 90
%@ 1673-565X
Y1 - 2023
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2200388

This study demonstrated the impacts of the synthesis methods on the textural structures, chemical properties, and hg0 capture capability of the mnOx system. Compared with the samples synthesized using the precipitation (PR) and hydrothermal (HT) methods, the adsorbent prepared via the sol-gel (SG) technique gave the best performance. At 150 °C, ca. 90% Hg0 removal efficiency was reached after 7.5 h for mnOx prepared by the SG method, ca. 40% higher than that of the other two methods. The specific surface area of the adsorbent synthesized via the SG technique (23 m2/g) was almost double that of the adsorbent prepared by the HT method (12 m2/g) and three times that of the one prepared by the PR method (7 m2/g). The presence of plentiful acid sites from the SG method facilitated the physisorption of Hg0, making more Hg0 available to be oxidized to HgO by the redox sites and thus giving the adsorbent prepared by the SG method the highest Hg0 removal efficiency. The strong oxidative ability accelerated the oxidation of the physically adsorbed Hg0 to HgO, which explained the higher Hg0 removal efficiency of the sample prepared using the HT method than that of the one synthesized by the PR technique. During the whole Hg0 removal cycles, chemisorption dominated, with the initial adsorption stage and the external mass-transfer process playing important roles.




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