Experimental Study on PCDD/Fs Adsorption onto Nano-Graphite

Li, Wen‐Wei; Lin, Xiaoqing; Yu, Miao; Mubeen, Ishrat; Buekens, Alfons; Li, Xiaodong

doi:10.4209/aaqr.2016.08.0353

Cited by 22 publications

(11 citation statements)

References 34 publications

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“…On this basis, it can be speculated that the catalytic mechanisms of these two catalysts are quite different. As for AC-O, CO 2 and CO were indeed detected during the reaction, showing catalytic properties of unsaturation carbon compounds, as reported previously [6].…”

Section: Catalytic Selectivity and By-product Analysissupporting

confidence: 59%

“…Heating can then regenerate the resultant saturated carbon-based materials. However, it has been suggested [6] that when using carbon-based materials to remove dioxins, it does not occur simply via physical adsorption. In the regeneration process, the carbon-based material destroys the oxygen radicals within the benzene rings of dioxin, leading to its structural change.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Degradation of Ortho-Chlorophenol Using Activated Carbon Modified by Different Methods

et al. 2018

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Abstract:The performance of activated carbon (AC) modified by different methods was compared for its catalytic degradation of ortho-chlorophenol (o-CP). For the chemically treated AC, the catalytic effect of AC-NH 3 ·H 2 O was superior to the other catalysts examined, having an o-CP removal efficiency of 82.2% at 330 • C. For the metal-modified catalysts, AC-V and AC-Co showed similar removal performances of 93.2% at 330 • C. N 2 adsorption-desorption isotherms, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and gas chromatography-mass spectrometry (GC-MS) analyses were used to characterize the reaction products, and different reaction mechanisms were proposed for both AC-NH 3 ·H 2 O and AC-V according to the results. Complete oxidative degradation of o-CP was achieved by AC-V, with AC-NH 3 ·H 2 O leading to the formation of additional dioxins. It can be deduced that a risk of dioxin synthesis and escape during the regeneration process is possible when nitrogen-modified carbon is used in selective catalytic reduction (SCR) denitrification reactions, especially in the presence of chlorine atoms, benzene rings, and oxygen.

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Section: Catalytic Selectivity and By-product Analysissupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Catalytic Degradation of Ortho-Chlorophenol Using Activated Carbon Modified by Different Methods

et al. 2018

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“…PCDD/Fs are semi-volatile organic compounds (SVOCs) and persistent organic pollutants (POPs) that are toxic to human health and ecosystem (Cheruiyot et al, 2015(Cheruiyot et al, , 2016Li et al, 2016a). There are 210 possible congeners of PCDD/Fs, and of these only 17 with chlorine atoms attached to the 2, 3, 7 and 8 positions have been shown to especially toxic.…”

Section: Introductionmentioning

confidence: 99%

Part I: PM2.5 and Polychlorinated Dibenzo-p-dioxins and Dibenzofurans (PCDD/Fs) in the Ambient Air of Southern China

Tang

Cui

Xing

et al. 2017

Aerosol Air Qual. Res.

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The atmospheric PM 2.5 , PM 2.5 /PM 10 , PCDD/Fs-WHO 2005 -TEQ, and PCDD/F (polychlorinated dibenzo-p-dioxins and dibenzofuran) phase distributions of 23 cities in southern China, during 2014-2016, were investigated in this study. In general, the cities with higher latitudes had higher PM 2.5 concentrations than those with lower latitudes. During 2014-2016, the lowest three-year average concentrations of PM 2.5 occurred at Sanya and Haikou and were 16.4 and 21.7 µg m -3 , respectively; while the highest concentrations of PM 2.5 was occurred at Wuhan and Luzhou and were 68.8 and 63.1 µg m -3 , respectively. During 2015-2016, the PM 2.5 concentrations of most of cities decreased, but those of five cities (Chengdu, Luzhou, Nanchang, Qujing and Quanzhou) increased, indicting that the air quality of these five cities was still not well controlled. The average R M values of the 23 cities were 5.20, 4.49 and 4.13 in 2014, 2015 and 2016, respectively, which revealed that the PM 2.5 concentrations in the cities of southern China slowly decreased, although they were still far above the WHO air quality regulated standard (10 µg m -3). In general, a city with a higher PM 2.5 concentration was also had a higher PM 2.5 /PM 10 ratio. Among the 23 cities, the six highest three-year averages of total-PCDD/Fs-WHO 2005 -TEQ concentrations were 0.0665, 0.0633, 0.0625, 0.0600, 0.0528 and 0.0526 pg-WHO 2005 -TEQ m -3 in Chengdu, Wuhan, Nanjing, Hefei, Luzhou and Hangzhou, respectively. During 2014, the six cities (Hefei, Nanjing, Wuhan, Guiyang, Shanghai and Chengdu) with the lowest temperatures in winter (an average of 5.4°C), their average particle phase fractions of total-PCDD/Fs-WHO 2005 -TEQ that were approximately 76%, 53%, 71% and 93% in the spring, summer, fall and winter, respectively; while, the six cities (Haikou, Fuzhou, Guangzhou, Nanning, Nanchang and Changsha) with the highest temperatures in summer (an average of 16.5°C), had average particle phase fractions of total-PCDD/Fs-WHO 2005 -TEQ that were approximately 61%, 42%, 57% and 81% in the spring, summer, fall and winter, respectively. The results of this study provide information showing the trends of both atmospheric PM 2.5 and PCDD/Fs in the cities of southern China. In addition, this study provided the overview relating to the PM 2.5 and PCDD/Fs in ambient air of southern China, which was not reported in previous studies. The results of this study were of great importance to present the trends of air quality in China. It is also useful for the establishment of control strategies in the future.

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“…Such strong surge poses serious risks to both human health and the natural environment, given the considerable emissions of dust, and a host of organic and inorganic pollutants (Cheruiyot et al, 2016;Lee et al, 2016;Li et al, 2016a;Xu et al, 2018). During conventional cement production Thuong et al, 2014) polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) emerge at the level of 0.99 µg I-TEQ ton -1 clinker.…”

Section: Introductionmentioning

confidence: 99%

Suppression of PCDD/Fs by Raw Meal in Cement Kilns

Lin

Ji²,

Zhan

et al. 2018

Aerosol Air Qual. Res.

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Raw meal of the cement production process could probably suppress the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). In this study, these suppression effects were studied and compared during the co-processing of municipal solid waste (MSW) with conventional feed materials such as pure CaCO 3 , and pure CaO. A top suppression efficiency of 96% was achieved for a ratio of MSW to raw meal of 1:15. Moreover, NaCl and CuCl 2 were added to the mix of feed material and MSW, to reveal the impact of additional chlorine and cations on PCDD/F formation. Similarly, the raw meal was mixed with the kiln dust to investigate possible suppression effects of those PCDD/Fs formed through the precursor or the de novo synthesis at a temperature of 350°C. The raw meal suppressed the formation of PCDD/Fs from kiln dust. Furthermore, the raw meal could not suppress the formation of PCDD/Fs on mixtures of kiln dust and NaCl or CuCl 2 , which could be associated with a potential increase in the formation effects of PCDD/Fs on the raw meal. The results can help in potential decision-making on the applicability of certain cement kilns on the co-processing of MSW containing high levels of Cl and Cu.

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Experimental Study on PCDD/Fs Adsorption onto Nano-Graphite

Cited by 22 publications

References 34 publications

Catalytic Degradation of Ortho-Chlorophenol Using Activated Carbon Modified by Different Methods

Catalytic Degradation of Ortho-Chlorophenol Using Activated Carbon Modified by Different Methods

Part I: PM2.5 and Polychlorinated Dibenzo-p-dioxins and Dibenzofurans (PCDD/Fs) in the Ambient Air of Southern China

Suppression of PCDD/Fs by Raw Meal in Cement Kilns

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