Effects of absorbed heavy metal ions on CO<sub>2</sub> gasification performance of spent activated carbon

JIA Baozhen; MA Mingyu

doi:10.13205/j.hjgc.202505019

Volume 43 Issue 5

May 2025

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JIA Baozhen, MA Mingyu. Effects of absorbed heavy metal ions on CO2 gasification performance of spent activated carbon[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(5): 170-177. doi: 10.13205/j.hjgc.202505019

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JIA Baozhen, MA Mingyu. Effects of absorbed heavy metal ions on CO₂ gasification performance of spent activated carbon[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(5): 170-177. doi: 10.13205/j.hjgc.202505019

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Effects of absorbed heavy metal ions on CO₂ gasification performance of spent activated carbon

doi: 10.13205/j.hjgc.202505019

JIA Baozhen¹,
MA Mingyu²

1. Shandong Heze Ecological Environment Monitoring Center, Heze 274000, China;
2. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China

Received Date: 2024-04-29
Accepted Date: 2024-08-14
Rev Recd Date: 2024-07-24

Available Online: 2025-09-11

Abstract

Abstract

In this paper， the spent activated carbon adsorbed heavy metals from simulated industrial wastewater was utilized for CO₂ gasification to produce CO-rich syngas. The effects of heavy metals， adsorption amount， reaction temperature， CO₂ concentration， and flow rate on the gasification performance were investigated. The results demonstrated that both Fe³⁺ and Co²⁺ had a good promoting effect on CO₂ gasification， and the activated carbon with adsorbed Co²⁺ had the best gasification effect， which increased the peak CO concentration by more than 130%， compared to the blank activated carbon. On the contrary， Cu²⁺ had a negative impact on the gasification reaction in the early stage and showed a promoting effect in the later stage. The CO₂gasification activity initially increased and then decreased with the rise in heavy metal adsorption. The optimal adsorption capacity was 10%. Additionally， CO₂with a flow rate of 100 mL/min was found to be optimal， as an excessive flow would reduce the retention time of CO₂ on the carbon surface. Furthermore， reaction activity exhibited a positive correlation with both reaction temperature and CO₂ concentration. Combined with X-ray diffraction phase analysis （XRD）， Fourier transform infrared（FTIR） absorption spectrometry， BET-specific surface area detection method （BET）， and scanning electron microscope with energy dispersive analyzer （SEM-EDS）， we found that the heavy metal ions adsorbed on the surface of the spent activated carbon were converted into metal oxides during the reaction， thus exhibiting catalytic gasification performance. This study presents a novel approach to the resource utilization of spent activated carbon and the production of high-value syngas.
- simulated industrial wastewater,
- spent activated carbon,
- CO₂ gasification,
- heavy metal,
- catalyze

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References(31)

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