Acidic surface functional groups control chemisorption of ammonium onto carbon materials in aqueous media

Sumaraj,; Xiong, Zixi; Sarmah, Ajit K.; Padhye, Lokesh P.

doi:10.1016/j.scitotenv.2019.134193

Cited by 51 publications

(10 citation statements)

References 72 publications

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“…The adsorption of hexazinone onto CSGAC was best described by the Freundlich model with the highest R 2 , suggesting that the adsorption of hexazinone onto CSGAC involves multi-layer adsorption with interactions of the adsorbates’ molecules with the heterogeneous surface of adsorbent (Foo and Hameed 2010 ; Salman et al 2011 ). Moreover, this can be confirmed by the n values ( n > 1) in the Freundlich model, representing higher intensity and favorability for chemisorption (Foo and Hameed 2010 ; Sumaraj et al 2020 ).…”

Section: Resultsmentioning

confidence: 83%

Photodegradation and adsorption of hexazinone in aqueous solutions: removal efficiencies, kinetics, and mechanisms

Jasemizad

Padhye

2022

Environ Sci Pollut Res

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Hexazinone, a globally applied broad-spectrum triazine herbicide, has not been mechanistically investigated previously under advanced oxidation processes (AOPs) and adsorption on activated carbon. In this study, its fate during UV-based oxidation with/without hydrogen peroxide (H2O2) and adsorption on coconut shell–based granular activated carbon (CSGAC) in water matrices was investigated. A comparison between various irradiation sources (visible, UVA, UVB, and UVC) revealed the highest degradation rate under UVC. More than 98% degradation of hexazinone was observed under 3 J cm−2 UVC fluence in the presence of 0.5 mM H2O2 at pH 7. Moreover, the degradation rate enhanced significantly with an increase in the initial dosage of H2O2, UV fluence, and contact time in the UV/H2O2 process. The rate of degradation was lower using secondary effluent than that of Milli-Q water due to the presence of dissolved organics in wastewater. However, the reactions in both matrices obeyed pseudo-first-order kinetics. The effect of different scavengers, including methanol, potassium iodide (KI), and tert-butyl alcohol (TBA), showed that hydroxyl radicals (•OH) played a dominant role in hexazinone degradation in the UV/H2O2 process. Hexazinone was effectively adsorbed by CSGAC through π-π electron donor–acceptor interactions between hexazinone’s triazine ring and CSGAC’s surface functional groups. The isotherm and kinetic studies showed that the adsorption followed the Freundlich model and pseudo-second-order reaction, respectively, suggesting chemisorption. This study provided mechanistic insights on the removal of hexazinone at the tertiary stage of wastewater treatment or the advanced treatment of wastewater reuse.

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Section: Resultsmentioning

confidence: 83%

Photodegradation and adsorption of hexazinone in aqueous solutions: removal efficiencies, kinetics, and mechanisms

Jasemizad

Padhye

2022

Environ Sci Pollut Res

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“…In conclusion, it can be expresses that multilayer of RO16 dye molecules tend to be formed on the heterogeneous surface of the lignocellulosic sawdust-Fe/Zn composite. Many scholars believed that Freundlich assumptions generally fit the chemical adsorption (note that n value is of great importance) 68 – 70 . By chemisorption, lignocellulosic sawdust-Fe/Zn makes chemical bonds with dye molecules via a significant number of functional groups.…”

Section: Resultsmentioning

confidence: 99%

Low-cost treated lignocellulosic biomass waste supported with FeCl3/Zn(NO3)2 for water decolorization

Kheradmand

Negarestani

Mollahosseini

et al. 2022

Sci Rep

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Dye pollution has always been a serious concern globally, threatening the lives of humans and the ecosystem. In the current study, treated lignocellulosic biomass waste supported with FeCl3/Zn(NO3)2 was utilized as an effective composite for removing Reactive Orange 16 (RO16). SEM/EDAX, FTIR, and XRD analyses exhibited that the prepared material was successfully synthesized. The removal efficiency of 99.1% was found at an equilibrium time of 110 min and dye concentration of 5 mg L−1 Adsorbent mass of 30 mg resulted in the maximum dye elimination, and the efficiency of the process decreased by increasing the temperature from 25 to 40 °C. The effect of pH revealed that optimum pH was occurred at acidic media, having the maximum dye removal of greater than 90%. The kinetic and isotherm models revealed that RO16 elimination followed pseudo-second-order (R2 = 0.9982) and Freundlich (R2 = 0.9758) assumptions. Surprisingly, the performance of modified sawdust was 15.5 times better than the raw sawdust for the dye removal. In conclusion, lignocellulosic sawdust-Fe/Zn composite is promising for dye removal.

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“…For example, Tomczyk et al [ 28 ] showed that wood biochar had a large adsorption capacity relative to Cu, which was associated with a high value of S BET . Wang et al [ 29 ] and Sumaraj et al [ 30 ] reported that surface functional groups of biochar: –COOH, –OH, and –COR, had a high impact on the heavy metal adsorption level.…”

Section: Resultsmentioning

confidence: 99%

Purification of Aqueous Media by Biochars: Feedstock Type Effect on Silver Nanoparticles Removal

et al. 2020

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Due to the harmful effects of nanoparticles in the environment, their effective removal from aqueous media is of great importance. This paper described the research on the silver nanoparticles (Ag-NPs) sorption on biochars obtained from different feedstock types. The sorbents were produced through pyrolysis (double-barrel method) of the vineyard (BV), paulownia tree (BP), and tobacco (BT). BV exhibited the highest specific surface area, porosity, value of variable surface charge, and content of surface acidic functional groups among the used biochars. The pseudo-second order model best described the obtained adsorption kinetics, whereas the Freundlich model accounted for the registered adsorption data. The Ag-NPs removal was highly efficient in the case of BV, especially in the nanoparticle concentration range 50–500 mg/L. Thus, this biochar can be considered as an ecofriendly, effective, low-cost organic adsorbent, potentially used in the aqueous media purification.

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Acidic surface functional groups control chemisorption of ammonium onto carbon materials in aqueous media

Cited by 51 publications

References 72 publications

Photodegradation and adsorption of hexazinone in aqueous solutions: removal efficiencies, kinetics, and mechanisms

Photodegradation and adsorption of hexazinone in aqueous solutions: removal efficiencies, kinetics, and mechanisms

Low-cost treated lignocellulosic biomass waste supported with FeCl3/Zn(NO3)2 for water decolorization

Purification of Aqueous Media by Biochars: Feedstock Type Effect on Silver Nanoparticles Removal

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