Removal of Gas-Phase Elemental Mercury by Bromine-Impregnated Activated Carbon

Wu, Jiang; Chen, Jie He; Zhang, Shuai Bo; He, Ping; Fang, Ji Hui; Wu, Ye

doi:10.4028/www.scientific.net/amr.356-360.1660

Cited by 6 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the dynamic test was carried out at room temperature, adsorption of mercury is attributed to physisorption . The chemical structure could play an important role in mercury adsorption …”

Section: Resultsmentioning

confidence: 99%

Removal of mercury from natural gas by a new activated adsorbent from olive stones

et al. 2017

View full text Add to dashboard Cite

This study was devoted to the valorization of a plant waste (olive stones): that is widely available in Mediterranean countries in order to remove mercury from natural gas. The raw material from olive stones was prepared by pyrolysis, chemical activation with phosphoric acid, and physical activation under steam. Two olive stone-based granular activated carbons were prepared: one with the virgin stones, while the other was impregnated with sulphur. After treatment, the adsorbents obtained were characterized by determining the iodine number, the methylene blue index, and by estimating the porous properties by N 2 adsorption at 77 K. Thermogravimetric analysis and infrared spectroscopy analysis were carried out to determine the functional groups before and after mercury adsorption. An experimental study of vapour-phase mercury adsorption by the activated carbons (virgin and sulphur-impregnated) and a comparison with a commercial material (HGR) were performed. The comparison, made by analyzing the adsorption in a continuous mode, showed that the proportion of sulphur and the porosity were important for the removal of mercury. In the conditions used, the mercury adsorption on the ACs studied follows a physisorption mechanism. The results showed that granular activated carbon-based olive stones (sulphur-impregnated) are very efficient to remove mercury (with 2864 mg/g) and also less expensive than commercial activated carbon due to their local availability.

show abstract

Section: Resultsmentioning

confidence: 99%

Removal of mercury from natural gas by a new activated adsorbent from olive stones

et al. 2017

View full text Add to dashboard Cite

show abstract

“…It was also observed that graft modification resulted in an increase in average pore diameter, indicating that the blocked pores would be micropores [49]. For the pure physical adsorption process, the adsorption capacity increases with the increasing surface area of the adsorbent [50]. Note that the untreated corn royalsocietypublishing.org/journal/rsos R. Soc.…”

Section: Elemental Analysismentioning

confidence: 96%

“…But for Pb(II), the Freundlich model fitted better as the value of R 2 = 0.99328. Both Langmuir and Freundlich isotherms may adequately describe the same set of data for liquidsolid adsorption over a range of concentrations, especially if the solution concentration is small and the adsorption capacity of the solid is large enough to make both isotherm equations approach a linear form [50]. The reusability of adsorbents is an important factor for the cost reductions in practical application [22,61].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Corn stalk as starting material to prepare a novel adsorbent via SET-LRP and its adsorption performance for Pb(II) and Cu(II)

Wang

et al. 2020

R. Soc. open sci.

View full text Add to dashboard Cite

Corn stalk was used as the initial material to prepare a corn stalk matrix-g-polyacrylonitrile-based adsorbent. At first, the corn stalk was treated with potassium hydroxide and nitric acid to obtain the corn stalk-based cellulose (CS), and then the CS was modified by 2-bromoisobutyrylbromide (2-BiBBr) to prepare a macroinitiator. After that, polyacrylonitrile (PAN) was grafted onto the macroinitiator by single-electron transfer living radical polymerization (SET-LRP). A novel adsorbent AO CS-g-PAN was, therefore, obtained by introducing amidoxime groups onto the CS-g-PAN with hydroxylamine hydrochloride (NH 2 OH · HCl). FTIR, SEM and XPS were applied to characterize the structure of AO CS-g-PAN. The adsorbent was then employed to remove Pb(II) and Cu(II), and it exhibited a predominant adsorption performance on Pb(II) and Cu(II). The effect of parameters, such as temperature, adsorption time, pH and the initial concentration of metal ions on adsorption capacity, were examined in detail during its application. Results suggest that the maximum adsorption capacity of Pb(II) and Cu(II) was 231.84 mg g –1 and 94.72 mg g −1 , and the corresponding removal efficiency was 72.03% and 63%, respectively. The pseudo-second order model was more suitable to depict the adsorption process. And the adsorption isotherm of Cu(II) accorded with the Langmuir model, while the Pb(II) conformed better to the Freundlich isotherm model.

show abstract

“…In carbon injection technologies, various chemically treated carbons were developed to enhance the elemental mercury removal efficiency including sulfur impregnation, 8,9 chloride impregnation 10,11 and bromination. 12,13 Among these chemical treatments, brominated sorbents appeared to be one of the most effective systems with 70% to 90% removal efficiency. 12,13 Most brominated sorbents involved the use of Br 2 vapors.…”

Section: Introductionmentioning

confidence: 99%

“…12,13 Among these chemical treatments, brominated sorbents appeared to be one of the most effective systems with 70% to 90% removal efficiency. 12,13 Most brominated sorbents involved the use of Br 2 vapors. However, the corrosive property of Br 2 vapor may cause problems in handling and processing.…”

Section: Introductionmentioning

confidence: 99%

In search of brominated activated carbon fibers for elemental mercury removal from power plant effluents

2013

View full text Add to dashboard Cite

Three methods have been developed to incorporate bromine containing groups into activated carbon fibers (ACFs) involving the use of bromine vapor, KBr impregnation and electrochemical methods using KBr solution. Both static and dynamic tests were carried out to measure the elemental mercury adsorption performances of these brominated samples. XPS and BET tests of these brominated ACFs have also been conducted. For our brominated samples, bromine atoms were incorporated into the carbon matrix which increased Hg 0 uptake capacities when compared to raw ACF samples. A possible mechanism for elemental mercury adsorption, which is likely to involve the formation of oxidized mercury complexes (e.g. [HgBr] + , [HgBr 2 ] and [HgBr 4 ] 2À ), is also discussed. For the brominated samples treated by Br 2 vapor and electrochemical methods, they showed stable Hg 0 adsorption performance (30% to 33% removal) up to 3 months, which are very promising for commercialization.

show abstract

Removal of Gas-Phase Elemental Mercury by Bromine-Impregnated Activated Carbon

Cited by 6 publications

References 5 publications

Removal of mercury from natural gas by a new activated adsorbent from olive stones

Removal of mercury from natural gas by a new activated adsorbent from olive stones

Corn stalk as starting material to prepare a novel adsorbent via SET-LRP and its adsorption performance for Pb(II) and Cu(II)

In search of brominated activated carbon fibers for elemental mercury removal from power plant effluents

Contact Info

Product

Resources

About