Carbonaceous Adsorbents Prepared from Sewage Sludge and Its Application for Hg0 Adsorption in Simulated Flue Gas

›› 2010, Vol. 18 ›› Issue (2): 231-238.

Carbonaceous Adsorbents Prepared from Sewage Sludge and Its Application for Hg⁰ Adsorption in Simulated Flue Gas

方平, 岑超平, 陈定盛, 唐志雄

South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China

收稿日期:2009-06-29 修回日期:2009-11-18 出版日期:2010-04-28 发布日期:2010-04-28
通讯作者: FANG Ping,E-mail:fangping@scies.org
基金资助:
Supported by the Science and Technology Planning Project of Guangdong(2006A36701004);the Basic Research Program of the Ministry of Environmental Protection(zx_200910_02)

Carbonaceous Adsorbents Prepared from Sewage Sludge and Its Application for Hg⁰ Adsorption in Simulated Flue Gas

FANG Ping, CEN Chaoping, CHEN Dingsheng, TANG Zhixiong

South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China

Received:2009-06-29 Revised:2009-11-18 Online:2010-04-28 Published:2010-04-28
Supported by:
Supported by the Science and Technology Planning Project of Guangdong(2006A36701004);the Basic Research Program of the Ministry of Environmental Protection(zx_200910_02)

摘要/Abstract

摘要： The carbonaceous adsorbent was prepared from mixtures of dewatered sludge and sawdust with enhanced ZnCl₂ chemical activation.Characteristics of the adsorbent were studied using scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FT-IR), and adsorption of nitrogen.The surface analysis showed that the carbonaceous adsorbent had good specific surface and porosity(394 m 2·g^-1 of BET surface,0.12 and 0.10 ml·g^-1 of microporous and mesoporous volume,respectively) .The oxygen functional groups such as-OH,C-O and C=O were found on the surface by FTIR and XPS(X-ray photoelectron spectroscopy) .The adsorption of elemental mercury(Hg0) on the carbonaceous adsorbent was studied in a fixed bed reactor.The dynamic adsorption capacity of carbonaceous adsorbent increased with influent mercury concentration,from 23.6μg·g^-1 at 12.58μg·m^-3to 87.9μg·g^-1 at 72.50μg·m^-3,and decreased as the adsorption temperature increased,from 246 μg·g^-1 at 25℃ to 61.3μg·g^-1 at 140℃,when dry nitrogen was used as the carrier gas.The carbonaceous adsorbent presented higher dynamic adsorption capacity than activated carbon,which was 81.2μg·g^-1 and 53.8μg·g^-1 respectively.The adsorption data were fitted to the Langmuir adsorption model.The physical and chemical adsorption were identified on the adsorbent.

关键词: carbonaceous adsorbent, dewatered sludge, Hg⁰

Abstract: The carbonaceous adsorbent was prepared from mixtures of dewatered sludge and sawdust with enhanced ZnCl₂ chemical activation.Characteristics of the adsorbent were studied using scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FT-IR), and adsorption of nitrogen.The surface analysis showed that the carbonaceous adsorbent had good specific surface and porosity(394 m 2·g^-1 of BET surface,0.12 and 0.10 ml·g^-1 of microporous and mesoporous volume,respectively) .The oxygen functional groups such as-OH,C-O and C=O were found on the surface by FTIR and XPS(X-ray photoelectron spectroscopy) .The adsorption of elemental mercury(Hg0) on the carbonaceous adsorbent was studied in a fixed bed reactor.The dynamic adsorption capacity of carbonaceous adsorbent increased with influent mercury concentration,from 23.6μg·g^-1 at 12.58μg·m^-3to 87.9μg·g^-1 at 72.50μg·m^-3,and decreased as the adsorption temperature increased,from 246 μg·g^-1 at 25℃ to 61.3μg·g^-1 at 140℃,when dry nitrogen was used as the carrier gas.The carbonaceous adsorbent presented higher dynamic adsorption capacity than activated carbon,which was 81.2μg·g^-1 and 53.8μg·g^-1 respectively.The adsorption data were fitted to the Langmuir adsorption model.The physical and chemical adsorption were identified on the adsorbent.

Key words: carbonaceous adsorbent, dewatered sludge, Hg⁰

方平, 岑超平, 陈定盛, 唐志雄. Carbonaceous Adsorbents Prepared from Sewage Sludge and Its Application for Hg⁰ Adsorption in Simulated Flue Gas[J]. , 2010, 18(2): 231-238.

FANG Ping, CEN Chaoping, CHEN Dingsheng, TANG Zhixiong. Carbonaceous Adsorbents Prepared from Sewage Sludge and Its Application for Hg⁰ Adsorption in Simulated Flue Gas[J]. , 2010, 18(2): 231-238.

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Carbonaceous Adsorbents Prepared from Sewage Sludge and Its Application for Hg⁰ Adsorption in Simulated Flue Gas

Carbonaceous Adsorbents Prepared from Sewage Sludge and Its Application for Hg⁰ Adsorption in Simulated Flue Gas

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