Removal of elemental mercury by modified bamboo carbon

Tan, Zengqiang; Niu, Guoping; Chen, Xiaowen

doi:10.1016/j.cjche.2015.09.001

Cited by 33 publications

(3 citation statements)

References 19 publications

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“…For example, activated carbons were treated by acids including H2SO4, HNO3 or HClO4 to enhance the removal of Hg 0 , due to the formation of oxygen-containing (C-O) or chlorinecontaining groups (C-Cl) on the surface of the adsorbents [4]. Various kinds of chlorides such as ZnCl2 [5][6][7][8], FeCl3 [7] and NH4Cl [8] were used as predecessors to modify carbonaceous adsorbents to improve the efficiency of mercury removal. The chemisorption between carbonaceous materials and Hg 0 was enhanced after the modification of adsorbent such as sulfur treatment [9] and the addition of CeO2 [7,10] However, using sorbent to remove Hg 0 has some drawbacks [11]: 1) a large amount of sorbent is required for the adsorption of Hg 0 indicating the high cost of sorbent use; 2) the disposal challenges of the exhaust sorbents mixed with fly ash.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of NO and Hg0 using Fe and Co co-doped Mn-Ce/TiO2 catalysts

Shen

Zhu

Zhang

et al. 2018

Fuel

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Fe and Co co-doped Mn-Ce/TiO2 (MCT) catalysts were investigated for the simultaneous removal of nitric oxide (NO) and elemental mercury (Hg 0 ) at reaction temperature lower than 200 °C. The catalysts were characterized by Brunauer-Emmett-Teller (BET), temperature program reduction (TPR), scanning electron microscope (SEM), x-ray diffraction (XRD) and x-ray photoelectron spectroscopy (XPS) analysis.The experimental results showed that the co-doped 2Fe4Co-MCT catalyst exhibited better performance for the simultaneous removal of NO and Hg 0 compared to Fe or Co doped catalysts. This could be due to higher BET surface area and better redox property of 2Fe4Co-MCT catalyst. In addition, we propose that chemisorbed O2 played a dominant role in selective catalytic reduction (SCR) of NO while lattice O2 played a key role in Hg 0 oxidation. The results also indicate that the introduction of Fe species enhanced the activity of SCR, whereas the introduction of Co species enhanced the oxidation of Hg 0 . The synergistic effect of Fe and Co species in the 2Fe4Co-MCT catalyst are also suggested to be an important mechanism for simultaneously removing NO and Hg 0 .

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Section: Introductionmentioning

confidence: 99%

Simultaneous removal of NO and Hg0 using Fe and Co co-doped Mn-Ce/TiO2 catalysts

Shen

Zhu

Zhang

et al. 2018

Fuel

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“…In recent years, bamboo charcoal has attracted a great deal of attention as an adsorbent substance for the adsorption of different contaminants from polluted and drinking water due to its exclusive micro porous structure and 4 to 10 times greater surface area than those in wood charcoal [11,12]. Therefore, the use of bamboo charcoal has increased remarkably in the adsorption of a large variety of heavy metals [13,14]. Proper oxidation of bamboo charcoal can make it one of the most selective ion exchangers by developing of the acidic functional groups on its surface and this property can be applied successfully in wide range of purposes as an adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Development of ion-exchange properties of bamboo charcoal modified with concentrated nitric acid

Khandaker

Kondo

Toyohara

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. The surface chemistry and the structural properties of activated carbon can be altered by the acidic modification. The objective of this study is to investigate the changes occurring in bamboo charcoal (BC) during activation with concentrated nitric acid. Low temperature (500˚C) carbonized BC has been prepared and oxidized with 70% concentrated boiling nitric acid (BC-AC). The porous properties of the BC are analyzed with nitrogen adsorption isotherm at 77 K. The surface structure is observed by Field emission scanning electronic microscope (FESEM) and the surface functional groups are examined by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and the pH of the point of zero charge (pHPZC). The results reveal that severe oxidation with HNO3 considerably decreases the surface area of BC with enhanced pore widening and FESEM observation demonstrates the erosive effect of oxidation. The FTIR analysis detects that some absorption bands are assigned for carboxyl, aldehyde and ketone groups on BC-AC. The XPS analysis also clearly shows that the ratio of oxygen and acidic functional groups has been enriched significantly on the BC-AC. The low pHPZC value of BC-AC confirms that the surface is highly acidic for the fixation of acidic functional groups on surface. In general, the existence of the abundant amount of acidic functional groups on adsorbents enhances the sorption of heavy metals ions in aqueous solution. Therefore, it is strongly expected that the modified BC, activated under the proposed conditions would be a promising ion exchanger in aqueous solution and can be applied for the adsorption of different heavy metal ions and radioactive materials from effluent.

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“…However, adsorption is one of the most promising techniques for removing mercury from water . Various solid adsorbents including fibers, resins, and inorganic materials were provided to adsorb mercury ions, and among them, activated carbon and macro‐porous polystyrene resin have an excellent absorption capacity for mercury, but chelating resin has a stronger binding force with metal ions than other solid adsorbents, and higher adsorption selectivity for metal ions, and mercapto chelating resin have an excellent complexation with mercury ions . The selective adsorption is considered to be an obvious advantage for the treatment of wastewater.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of polyphenylene sulfide–based chelating resin–functionalized 2‐amino‐1,3,4‐thiadiazole for selective removal Hg(II) from aqueous solutions

Shao

Xiao

Tian

et al. 2017

Polymers for Advanced Techs

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A novel chelating resin (PPS-ATD) containing N and S elements was prepared through the chloromethylation of polyphenylene sulfide resin and subsequent functionalization with 2amino-1,3,4-thiadiazole (ATD). The structure of PPS-ATD was systematically characterized and analyzed by the Fourier transform infrared spectroscopy, elemental analysis, thermogravimetric analysis, scanning electron microscope, and energy dispersive spectrometer. The adsorption performance of PPS-ATD was evaluated by batch methods at different pH, temperature, adsorption time, and initial concentration, and the results showed that the PPS-ATD exhibited high adsorption capacity (197.79 mg·g −1 at 298 K) and selectivity for Hg(II). The adsorption of PPS-ATD for Hg(II) was well fitted by the Langmuir isotherm model, and the adsorption process was endothermic. After 5 consecutive regeneration cycles, no obvious loss in the adsorption capacity of the PPS-ATD was found, which implied that the PPS-ATD had great application prospects in the treatment of mercury-containing wastewater. KEYWORDS 2-amino-1,3,4-thiadiazole, Hg(II), adsorption performance, chelating resin, polyphenylene sulfide 1 | INTRODUCTION Mercury is a toxic heavy metal and refractory pollutant, which is regarded as a highly dangerous element by the environmental protection department. 1-3 In human activities, emissions of mercury pollutants are mainly from the calcination of sulfide ore and the combustion of fossil fuel. 4-6 These mercury pollutants cause the production of mercury-containing wastewater and pollute the environment, 7,8 because of the volatility, persistence, and bioaccumulation of mercury wastewater, 9-11 and the treatments of mercury-containing wastewater got great attention in recent years.It is very important to develop effective technologies to deal with mercury-containing wastewater. There are many methods to treat mercury-containing wastewater, such as chemical precipitation, membrane filtration, electrodialysis, phytoremediation, and adsorption.However, adsorption is one of the most promising techniques for removing mercury from water. [12][13][14][15] Various solid adsorbents including fibers, resins, and inorganic materials were provided to adsorb mercury ions, [16][17][18][19] and among them, activated carbon and macro-porous polystyrene resin have an excellent absorption capacity for mercury, [20][21][22] but chelating resin has a stronger binding force with metal ions than other solid adsorbents, and higher adsorption selectivity for metal ions, 23,24 and mercapto chelating resin have an excellent complexation with mercury ions. [25][26][27][28] The selective adsorption is considered to be an obvious advantage for the treatment of wastewater.Most of chelating resins are prepared on the basis of polystyrene resin. Polyphenylene sulfide (PPS) is a novel resin matrix, which can be used to prepare functional materials, and since 2012, a series of fibrous ion exchanger based on PPS have been prepared by our laboratory. [29][30][31][32] However, little systemat...

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Removal of elemental mercury by modified bamboo carbon

Cited by 33 publications

References 19 publications

Simultaneous removal of NO and Hg0 using Fe and Co co-doped Mn-Ce/TiO2 catalysts

Simultaneous removal of NO and Hg0 using Fe and Co co-doped Mn-Ce/TiO2 catalysts

Development of ion-exchange properties of bamboo charcoal modified with concentrated nitric acid

Preparation and characterization of polyphenylene sulfide–based chelating resin–functionalized 2‐amino‐1,3,4‐thiadiazole for selective removal Hg(II) from aqueous solutions

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