The adsorption properties of functionalization vetiver grass-based activated carbon: the simultaneous adsorption of phosphate and nitrate

Li, Jianmin; Fang, Xiuying; Yang, Min; Tan, Wei; Zhang, Haocheng; Zhang, Yanyan; Li, Guizhen; Wang, Hongbin

doi:10.1007/s11356-020-09271-5

Cited by 15 publications

(3 citation statements)

References 19 publications

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“…Clearly, it could be mention that the pseudo‐second‐order model is the most adequate model able to fit the experimental results for both adsorbents. These findings are in accordance with that obtained by Li et al, 2020, Peng et al, 2009 and Jiang et al, 2019.…”

Section: Resultssupporting

confidence: 93%

Removal of phosphate from synthetic wastewater: A comparative study between both activated clays using an experimental design methodology

Yahya

Msadok

et al. 2022

Water Environment Research

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Phosphate‐loaded industrial wastewaters have resulted in numerous environmental issues that have hard hit the Gulf of Gabes‐Tunisia, making the environmental protection one of the most compelling priorities. Consequently, this study aimed first to compare the amounts of phosphate adsorbed by two types of Tunisian activated clays. The second goal was to assess and optimize the phosphate removal efficiency of these clays, using Box–Behnken design (BBD) under response surface methodology. Results showed that the highest adsorption amounts of 130.16 mg g−1, 125.42 mg g−1 were yielded for Jebel Haidoudi clay and Douiret clay, respectively. These values demanded an initial phosphate concentration of 300 mg L−1, a contact time of 5 h, and a pH of 2). Thus, kinetic and isotherm studies of phosphate elimination from synthetic solutions demonstrated that for both activated clays, the pseudo‐second‐order and Langmuir equation fitted very well the experimental data, respectively. These results indicate that phosphate adsorption might be mainly a chimisorption phenomenon and a monolayer process. All these findings confirmed that both activated clays could be considered as a competent, cost‐effective, efficient and ecological alternative for the elimination of phosphate from industrial wastewaters. Practitioner Points Activated clay could be adopted as an efficient and cost‐effective adsorbent. The optimum conditions were nominated as 300 mg L−1 of initial phosphate concentration, 5 h contact times and pH = 2. The probable uptake mechanism of phosphate followed predominantly the acid‐base interaction and hydrogen bond.

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Section: Resultssupporting

confidence: 93%

Removal of phosphate from synthetic wastewater: A comparative study between both activated clays using an experimental design methodology

Yahya

Msadok

et al. 2022

Water Environment Research

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“…The negative values of ΔG at 25 °C and 35 °C suggested that the adsorption of phenol was a spontaneous process. 45,46 The calculated value of ΔH was also negative, suggesting an exothermic reaction of the adsorption process, which agrees with the above-mentioned adsorption isotherm (depicted in Supporting Information Fig. S3).…”

Section: Adsorption Isothermsupporting

confidence: 86%

Fabrication of organobentonite by microwave‐assisted heating and its adsorption property for phenol

Zhang

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND: The adsorption removal of phenol onto bentonite that was prepared by the traditional hydrothermal method has been widely studied; especially, surfactant-modified bentonite has achieved an exclusive position on effective removal to phenol. However, the adsorption performance of the bentonite functionalized by double-carbon chain surfactants in a microwave field for phenol is relatively low. The study on the fabrication of organobentonite by microwave-assistance to remove organic pollutants still needs to be investigated. RESULTS:The adsorption performance of bentonite was enhanced after functionalizing with Dihexadecyldimethylammonium Bromide (D1621). FTIR and XRD patterns revealed that D1621 was successfully intercalated into bentonite, and the interval space was increased by 1.54 to 1.84 nm. The optimized preparation condition was obtained at a molar ratio (D1621: Bentonite) of 0.36, solid-liquid ratio (D1621 + Bent: water) of 0.12, microwave mode of Med, and thermal radiation for 6 min based on the indicator of phenol adsorption uptake. An excellent removal rate for phenol was observed at pH 2 to 7 and room temperature in adsorption tests. The adsorption process was spontaneous at room temperature according to thermodynamic parameters, and it agrees with Freundlich (R 2 = 0.9781) and pseudo-second-order (R 2 = 0.9999) models, validating a chemisorption process.CONCLUSION: The D1621-Bent perpetrated by using the microwave-assisted heating method was proven to be a reliable adsorbent for phenol in water. The adsorption performance of bentonite on phenol was remarkably enhanced after the introduction of organic modifiers.

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“…As shown in Figure 8, on the basis of prior studies, it is important to mention that when the pH of the solution is below 2, both carboxyl groups and PO 3À 4 have no electrical charge. Therefore, the selective adsorption of PO 3À 4 on carboxyl-modified electrodes relies on weak hydrogen bonds during the protonation process (Wu et al 2020;Li et al 2021). As the pH increases, the protonation of the carboxyl groups and PO 3À 4 gradually decreases, resulting in stronger hydrogen bonding and electrostatic repulsion between the two (Zhu et al 2019;Wu et al 2020).…”

Section: Selective Electroadsorption Of Phosphate By Ac-x Electrodesmentioning

confidence: 99%

Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization

Miao

Deng

Chen

et al. 2021

Water Science and Technology

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Capacitive deionization (CDI) has been considered as a promising technology for removing phosphate from water but suffer inferior selectivity and electrosorption performances for phosphate of current carbon electrodes in CDI. Herein, we achieved highly selective phosphate removal from a ternary effluent of Cl−, , and by using nitric acid-treated activated carbon (AC) with various modification times and pure AC as the anode and cathode, a novel phosphate selective asymmetric CDI reactor. The results showed that carboxyl groups greatly grafted on the materials after modification (varying from 0.00084 to 0.0012 mol g−1). The phosphate selectivity of the present research was higher than that of unmodified CDI, and it increased with the increase of carboxyl groups content. The highest phosphate selectivity (2.01) in modified materials is almost six times higher than that of pure AC. Moreover, the modified electrodes exhibited good regenerative ability with a phosphate desorption efficiency of around 72.12% during the adsorption/desorption process and great stability during the cycling experiment. These results demonstrated that the innovative application of nitric acid-modified AC can effectively selectively remove phosphate from mixed anion solution, opening a hopeful window to selective adsorption in water treatment by CDI.

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The adsorption properties of functionalization vetiver grass-based activated carbon: the simultaneous adsorption of phosphate and nitrate

Cited by 15 publications

References 19 publications

Removal of phosphate from synthetic wastewater: A comparative study between both activated clays using an experimental design methodology

Removal of phosphate from synthetic wastewater: A comparative study between both activated clays using an experimental design methodology

Fabrication of organobentonite by microwave‐assisted heating and its adsorption property for phenol

Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization

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