ENVIRONMENTAL TECHNOLOGY
·
2020
·
IF 2.213
Shengcai Wang,Zequn Yang,Jiexia Zhao,Hailong Li,Jianping Yang,Jianfei Song,Xueyi Guo
Developing efficient sorbents with rapid kinetics is the main challenge encountered for Hg0 capture from coal combustion flue gas in a sorbent injection scenario. Binary mineral sulfide-based materials combining copper sulfide (CuS) and zinc sulfide (ZnS) to exert their capabilities for Hg0 capture at the low- and high-temperature was for the first time reported for Hg0 removal to realize a wide temperature range sorbents. When the molar ratio between CuS and ZnS was 10%, the as-synthesized 10Cu-Zn nanocomposite exhibited excellent Hg0 uptake rate at 150°C that could degrade 40 μg/m3 of Hg0 to undetectable level at the end of a 60-s experiment with the dosage of only 1 mg. This Hg0 uptake rate is folds higher compared to that when bare CuS or ZnS was adopted alone at this specific temperature. The typical flue gas atmospheres had negligible effect on Hg0 removal over 10Cu-Zn in a short contact time, which further suggests that the binary sorbents were proper to be injected before the electrostatic precipitator system. Moreover, it is found that, by adjusting the ratio between CuS and ZnS, it is potential to develop binary sorbent suiting any temperature conditions that may achieve an exceedingly high Hg0 capture performance. Thus, this work not only justified the candidature of 10Cu-Zn as a promising alternative to traditional activated carbon for Hg0 capture from coal combustion flue gas but also guided the future development of multi-component mineral sulfide-based sorbents for Hg0 pollution remediation from various industrial flue gases.
研究领域:
环境科学
·
大气污染控制
·
材料科学
·
化学工程
·
能源工程
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yongpeng Ma,Jianghui Du,Yifei Wu,Haobing Yan,Ruiqi Liu,Xiaojing Zhang,Hongzhong Zhang,Liming Zhou,Wenjun Huang
Among the diverse pollutants emitted from coal-fired and non-ferrous metal smelting flue gas, Hg 0 and CO have emerged as globally concerning environmental pollutants. However, the simultaneous abatement of multiple pollutants remains a critical challenge to be addressed. In this study, cobalt nanoclusters (Co NCs) were anchored on the terminal oxygen of Ti-O on Ti 3 C 2 MXene and formed asymmetric oxygen vacancies Co-Ov-Ti via a one-step hydrothermal method, yielding Co NCs/Ti 3 C 2 MXene with a morphology of hierarchical nanosheet-assembled spheres for Hg 0 and CO catalytic oxidation. Co NCs/Ti 3 C 2 MXene exhibited excellent 44 % and 52 % of Hg 0 and CO simultaneous removal efficiency at the optimal temperature of 250 °C, respectively. DFT calculations combined with energy barrier modeling were employed to investigate the reaction pathways and energy variations during the catalytic oxidation of Hg 0 and CO. Specifically, Hg 0 oxidation follows the Eley-Rideal mechanism, with a rate-determining energy barrier of 2.11 eV, while CO oxidation adheres to the Langmuir-Hinshelwood mechanism, featuring a rate-determining barrier of 0.17 eV. In the co-catalytic oxidation process, competitive adsorption between Hg 0 and CO was observed, primarily manifested as competition for Ov on the catalyst surface. This study provides a novel strategy for the synergistic control of multi-pollutants in industrial flue gas.
研究领域:
环境催化
·
材料科学
·
大气污染控制
·
物理化学
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 5
·3597-3611
·
IF 1.674
Zhou Xiao,Cao Limei,Yang Ji
An electrode in situ catalytic oxidation of elemental mercury (Hg 0 ) in flue gas using Fenton-like catalysts in a self-made reactor was proposed. The catalysts were prepared by a hydrothermal method, and the catalysts were loaded on the electrode and could improve the removal efficiency of Hg 0 . About 240 μg/m 3 of elemental Hg 0 could be removed in 40 min. The morphology and structure information of the prepared catalysts were characterized by SEM, EDS, XRD, SEM, XPS and so on. The effects of operation parameters (voltage, inlet flow, electrolyte concentration, initial concentration of Hg 0 , pH of solution) were investigated. The above results showed the strong oxidative effect of hydroxyl radicals (·OH), which was produced by the catalysts playing a dominative role during Hg 0 removal reactions. Graphical
研究领域:
环境化学
·
大气污染控制
·
电化学工程
·
催化科学与技术
·
环境功能材料
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 13
·13602-13618
·
IF 2.914
Yue Huifang,Lu Pei,Su Wei,Xing Yi,Li Rui,Wang Jiaqing
To optimize the simultaneous removal of NO x and Hg 0 , a series of Cu a Ce b Zr c O 3 /γ-Al 2 O 3 catalysts prepared by the impregnation method were explored and their physical and chemical properties were analyzed by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, X-ray photoelectron spectroscopy (XPS), NH 3 -temperature-programmed desorption (NH 3 -TPD), H 2 -temperature-programmed reduction (H 2 -TPR), in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFT), and Fourier transform infrared spectroscopy (FT-IR). The results showed that 15% Cu 1.4 Ce 0.55 Zr 0.25 O 3 /γ-Al 2 O 3 resulted in the highest conversion efficiency for the simultaneous removal of NO x (93%) and Hg 0 (85%) at low temperatures (200 to 300 °C). Meanwhile, 15% Cu 1.4 Ce 0.55 Zr 0.25 O 3 /γ-Al 2 O 3 showed good stability and resistance to SO 2 and H 2 O, which is due to its low crystallinity, good textural performance, and strong redox ability. According to the TPD, TPR, and XPS results, the strong acidic character of 15% Cu 1.4 Ce 0.55 Zr 0.25 O 3 /γ-Al 2 O 3 promoted the removal of NO x and Hg 0 . The synergistic effect between CuO and CeO 2 in 15% Cu 1.4 Ce 0.55 Zr 0.25 O 3 /γ-Al 2 O 3 can increase the mobility of chemically adsorbed oxygen and activates lattice oxygen, leading to an excellent performance. The DRIFT results showed that NH 3 , NH 4 + , nitrate, and nitrite participated in the selective catalytic reduction (SCR) reaction. On the basis of our experimental results, Hg 0 and NO x removal mechanisms were proposed as Hg (ad) + O* → HgO (ad) and 2NH 3 /NH 4 + (ad) + NO 2 /NO 3 − (ad) + NO→2N 2 + 3H 2 O/2H + , respectively.
研究领域:
环境催化
·
大气污染控制
·
材料化学
·
表面科学
·
工业生态学
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Mingze Jiao,Jia Chen,Lulu Yang,Qinyuan Hong,Yiqi Feng,Wenjun Huang,Bing Pei,Qianxuan Zhang,Qingyan Fu,Zan Qu,Naiqiang Yan,Haomiao Xu
Accurate detection of trace atmospheric mercury is critical for toxicological assessment and environmental protection. However, achieving parts per billion-level sensitivity with high selectivity between gaseous elemental mercury (Hg0) and oxidized mercury (Hg2+) remains a significant challenge. Here, we present a novel dual-channel enrichment trap system that selectively captures Hg0 by using a layered Au-MXene (Ti3C2Tx) composite as the sorption trap. This composite demonstrates exceptional selectivity for Hg0, with a selectivity ratio of up to 76.7 over Hg2+, and achieves 99.7% ± 0.3% (n = 3) sorption efficiency for ppb-level Hg0 within 30 min at room temperature. Complete desorption is achieved in just 90 s at 300 °C, demonstrating a response time of 45 s for Hg0 detection through the dual-electrothermal Hg0 channel. The Au–Ti3C2Tx preconcentration cartridge exhibits excellent moisture resistance, high-temperature stability, and long-term durability. Density functional theory (DFT) calculations reveal that the built-in electric field at the Au–Ti3C2Tx interface accelerates electron transfer, reducing preconcentration and regeneration times. This technology integrates seamlessly with the cold vapor atomic absorption spectrophotometer (CVAAS) method to form a mercury dual-channel continuous emission measurement system (Hg DCEMS), ensuring highly selective and precise trace Hg0 detection. This advancement provides a device for accurately measuring the Hg0 concentration, enabling better mercury pollution control.
研究领域:
环境分析化学
·
大气污染控制
·
材料科学
·
传感器技术
·
重金属检测
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2014
·
IF 2.063
Jianrong Li,Jinsheng Chen,Yanke Yu,Chi He
The Fe–Mn–Ce/CP catalyst prepared by the incipient-wetness impregnation method was investigated for elemental mercury (Hg 0 ) removal in simulated coal-fired flue gas . The incorporation of Fe could remarkably enhance the SO 2 -resistance of Fe–Mn–Ce/CP catalyst at low temperature, and the existence of water vapor had negative impact on Hg 0 removal efficiency. More than 95% of Hg 0 could be removed at 100 °C under the conditions of 60 ppm HCl, 3% O 2 ( v/v ), 5% H 2 O ( v/v ) and 400 ppm SO 2 . Hg-TPD results indicated that Hg 0 adsorption amount decreased after the addition of H 2 O or SO 2 . The XPS results revealed that the incorporation of Fe could enhance the contents of high valence Mn x + (i.e., Mn 3+ /Mn 4+ ) and Ce 3+ species in the composite catalysts, which are favorable for the oxidation process of elemental mercury. The surface characteristics were not the primary factor determining the catalytic activity . Overall, the catalytic performance of the Fe–Mn–Ce/CP catalyst was closely related to the Fe 3+ state, high ratios of (Mn 4+ + Mn 3+ )/Mn 2+ and high content of not fully coordinated cerium species.
研究领域:
环境催化
·
大气污染防治
·
能源化学工程
·
材料科学与工程
·
表面化学
·
烟气净化技术
✓ 已验证
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 9
·799
·
IF 4
Xuhui Wei,Ruoyang Du,Rushan Zhao,Wenzhi Li,Caihong Jiang,Junwei Wang
The efficient removal of elemental mercury (Hg0) from coal-fired flue gas is a critical challenge in environmental governance. This study proposes utilizing waste fluid catalytic cracking catalyst (WFCC) as the potential support for Hg0catalytic oxidation. After activation (AFCC) via calcination decarbonization, a composite support (AFCC-PG) was fabricated using palygorskite (PG) as a binder. Subsequently, VOxwas loaded onto the support to form the VOx/AFCC-PG catalyst for Hg0removal. Experimental results demonstrate that the VOx/AFCC-PG catalyst achieves >95% Hg0removal efficiency under simulated flue gas conditions (150 °C, GHSV = 6000 h−1) while maintaining excellent stability over 60 h. Furthermore, Hg-TPD and XPS analyses indicate that the synergistic lattice oxygen oxidation–adsorption established between VOxand the AFCC-PG plays a key role in efficient Hg0removal. This study proposes a cost-effective strategy for both the resource utilization of waste catalysts and the control of mercury pollution in coal-fired flue gas.
研究领域:
环境科学
·
催化化学
·
污染控制
·
废弃物资源化
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）