Experimental and kinetic studies of gas-phase mercury adsorption by raw and bromine modified activated carbon

Zhou, Qiang; Duan, Yufeng; Hong, Ya-Guang; Zhu, Chun; She, Min; Zhang, Jun; Hong-qi, Wei

doi:10.1016/j.fuproc.2014.12.052

Cited by 144 publications

(71 citation statements)

References 31 publications

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“…The experimental data of kinetics at different solution temperatures (20,30, and 40ºC) were used to calculate the apparent activation energy of TA adsorbed on MIEX resin. The apparent activation energy was calculated by an empirical equation (Arrhenius equation [36]):…”

Section: Adsorption Thermodynamic Studiesmentioning

confidence: 99%

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Ding¹,

Zhu²,

Du³

et al. 2017

Pol. J. Environ. Stud.

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Tannic acid (TA) is a component of natural organic matter (NOM) and is ubiquitously present in most surface and groundwater due to the decomposition of plant biomass [1][2]. Previous research has demonstrated that TA is toxic for aquatic organisms such as algae, phytoplankton, fish, and invertebrates, which can cause serious environment problems [3]. Particularly, TA can react with chlorine and form carcinogenic disinfection by-products (DBPs) during the conventional chlorination disinfection process of drinking water [4][5]. Therefore, it is necessary to seek effective methods for reducing and removing TA from raw water. [12,16] have been utilized to remove TA from water and wastewater. Among different adsorbents, the anion ion-exchange resin is considered one of the most effective methods due to its high removal efficiency [17]. As a novel anion ionexchange resin, magnetic ion exchange (MIEX) resin can be a potential candidate for TA removal with its promising technology for NOM removal from drinking water [18].Pol. J. Environ. Stud. Vol. 26, No. 3 (2017) This study evaluated the removal characteristics of tanic acid (TA) adsorbed on MIEX resin by batch experiments. MIEX resin can effectively remove TA from raw water at pH 6-9. Chloride and sulfate have adverse effect on the removal of TA. Conversely, bicarbonate can further the removal of TA. The Elovich model is the most suitable for depicting the kinetic process, and liquid film diffusion dominates the adsorption rate. The Freundlich model is reliable for describing the adsorption equilibrium. Adsorption is an endothermic, entropy-driving, and thermodynamically spontaneous process. The energy changes confirm the physical adsorption and dominate adsorption behavior. The sodium chloride solution (0.5%) can effectively regenerate the MIEX resin saturated TA, and the regenerated resin can be used circularly. Therefore, MIEX resin is a promising adsorbent for the removal of TA from raw water.

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Section: Adsorption Thermodynamic Studiesmentioning

confidence: 99%

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Ding¹,

Zhu²,

Du³

et al. 2017

Pol. J. Environ. Stud.

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“…The experiment apparatus has been described in a previous study [33]. In a fixed-bed system, the mercury adsorption equilibrium is obtained when the mercury breakthrough rate reaches 100%.…”

Section: Mercury Adsorption Equilibrium Testsmentioning

confidence: 99%

“…Due to high adsorption capacity of activated carbon and low mercury concentration in flue gas, it may take several days to reach the equilibrium [19]. It is reasonable to extrapolate the mercury adsorption capacity at equilibrium from the pseudo-second order kinetic equation according to mercury uptake curves in 3 h [33]. This is because the pseudo-second order kinetic model can well describe mercury adsorption process and accurately predict mercury adsorption parameters according to literature [33,35].…”

Section: Mercury Adsorption Equilibrium Testsmentioning

confidence: 99%

“…It is reasonable to extrapolate the mercury adsorption capacity at equilibrium from the pseudo-second order kinetic equation according to mercury uptake curves in 3 h [33]. This is because the pseudo-second order kinetic model can well describe mercury adsorption process and accurately predict mercury adsorption parameters according to literature [33,35]. A linear form of Freundlich equilibrium equation is shown as follows.…”

Section: Mercury Adsorption Equilibrium Testsmentioning

confidence: 99%

“…In our previous study [33], we found that mercury adsorption on sorbent could be divided into two stages, including surface adsorption and intraparticle diffusion adsorption. In the initial stage of adsorption, the surface adsorption was the main adsorption form.…”

Section: Introductionmentioning

confidence: 99%

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Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

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A novel H2SO4/H2O2 combining modification was used to modify two kinds of macroalgae (Sargassum and Enteromorpha) biochars to remove gaseous H2S. Desulfurization performance, mechanism, and kinetics of the biochars were studied. The proposed H2SO4/H2O2 combining modification greatly improves the desulfurization performance of biochars. Compared with common adsorbents, the biochars achieve better desulfurization effects. Desulfurization processes follow the pseudo‐first‐order model and external mass transfer is the control step. H2S adsorption over biochars means physical adsorption, while chemical adsorption is auxiliary. H2SO4/H2O2 combining modification improves the desulfurization performance by enhancing the pore structure and increasing O‐containing functional groups.

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Experimental and kinetic studies of gas-phase mercury adsorption by raw and bromine modified activated carbon

Cited by 144 publications

References 31 publications

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Modeling and experimental studies of in-duct mercury capture by activated carbon injection in an entrained flow reactor

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂

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Experimental and kinetic studies of gas-phase mercury adsorption by raw and bromine modified activated carbon

Cited by 144 publications

References 31 publications

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Modeling and experimental studies of in-duct mercury capture by activated carbon injection in an entrained flow reactor

Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H2SO4/H2O2

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Product

Resources

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Gaseous Hydrogen Sulfide Removal Using Macroalgae Biochars Modified Synergistically by H₂SO₄/H₂O₂