Acid-treated pomegranate peel; An efficient biosorbent for the excision of hexavalent chromium from wastewater

Rai, Rajan; Aryal, Ram Lochan; Paudyal, Hari; Gautam, Surendra Kumar; Ghimire, Kedar Nath; Pokhrel, Megh Raj; Poudel, Bhoj Raj

doi:10.1016/j.heliyon.2023.e15698

Cited by 10 publications

(3 citation statements)

References 63 publications

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“…The WHO has set a limit of 0.05 mg/L for the maximum content of Cr(VI) in drinking water. The results are found agreeing to the findings of previous studies (Pant et al, 2022;Rai et al, 2023).…”

Section: Impact Of Adsorbent Dosagesupporting

confidence: 93%

“…Peaks at 2924.09 cm-1 in RCLS and 2920.23 cm-1 in CLCS attributed to -CH stretching vibrations, which disappeared in Cr(VI)-adsorbed CLCS. A peak at 1620.21 cm-1 in RLCS, shifting to 1589.34 cm-1 in CLCS, and disappearing after metal adsorption can be correspond to C=O stretching vibrations(Rai et al, 2023). Furthermore, a peak at 1018.41 cm-1 in RLCS shifted and slightly deformed in CLCS.…”

mentioning

confidence: 92%

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Effective Chromium (VI) Removal from Contaminated Water by Chemically Modified Litchi Chinensis Seed Powder: Characterization, Kinetic and Isotherm Studies

Rai,

Pokharel,

Khadka

et al. 2023

Int. J. Environ.

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In this work, Litchi chinensis seed powder has been chemically modified to charred Litchi chinensis seed powder (CLCS) for removal of Cr(VI) from the simulated wastewater. The adsorption capacity of CLCS for Cr(VI) was determined in batch experiment method. The materials were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and fourier transform infrared (FTIR) spectroscopy. Biosorption behaviour was investigated using isotherm and kinetic models. CLCS demonstrated a noteworthy adsorption capacity for Cr(VI), with a maximum adsorption capacity of 69.93 mg/g at pH 2.0. The Cr(VI) adsorption onto CLCS was found to follow pseudo-second-order kinetics and the experimental data best fitted with Langmuir isotherm model. According to the results, Cr(VI) can be removed from acidic wastewater using CLCS as an adsorbent. The results indicate that further studies and modification are necessary to improve the efficiency of the CLCS, and its feasibility at normal pH conditions.

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Section: Impact Of Adsorbent Dosagesupporting

confidence: 93%

mentioning

confidence: 92%

Effective Chromium (VI) Removal from Contaminated Water by Chemically Modified Litchi Chinensis Seed Powder: Characterization, Kinetic and Isotherm Studies

Rai,

Pokharel,

Khadka

et al. 2023

Int. J. Environ.

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“…Conversely, ∆H exhibits a positive trend, suggesting that the adsorption process of nFeS-F onto Zn(II) and Cu(II) is a spontaneous heat-absorption reaction. Furthermore, the temperature elevation proves advantageous for the adsorption of nFeS-F onto Zn(II) and Cu(II) 51 . Positive ΔS values indicate an augmentation in the randomness of the nFeS-F surface, while smaller ΔS values denote a subtle alteration in the adsorbent structure 52 .…”

Section: Resultsmentioning

confidence: 99%

Study on the adsorption of Zn(II) and Cu(II) in acid mine drainage by fly ash loaded nano-FeS

Guo,

Fu,

Gao

et al. 2024

Sci Rep

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Aiming at the acid mine drainage (AMD) in zinc, copper and other heavy metals treatment difficulties, severe pollution of soil and water environment and other problems. Through the ultrasonic precipitation method, this study prepared fly ash-loaded nano-FeS composites (nFeS-F). The effects of nFeS-F dosage, pH, stirring rate, reaction time and initial concentration of the solution on the adsorption of Zn(II) and Cu(II) were investigated. The data were fitted by Lagergren first and second-order kinetic equations, Internal diffusion equation, Langmuir and Freundlich isotherm models, and combined with SEM, TEM, FTIR, TGA, and XPS assays to reveal the mechanism of nFeS-F adsorption of Zn(II) and Cu(II). The results demonstrated that: The removal of Zn(II) and Cu(II) by nFeS-F could reach 83.36% and 70.40%, respectively (The dosage was 8 g/L, pH was 4, time was 150 min, and concentration was 100 mg/L). The adsorption process, mainly chemical adsorption, conforms to the Lagergren second-order kinetic equation (R2 = 0.9952 and 0.9932). The adsorption isotherms have a higher fitting degree with the Langmuir model (R2 = 0.9964 and 0.9966), and the adsorption is a monolayer adsorption process. This study can provide a reference for treating heavy metals in acid mine drainage and resource utilization of fly ash.

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Studies on ultrafast and remarkable removal of phosphate from sewage water by metal-organic frameworks

Singh,

Srivastava,

Nagar

et al. 2023

Environ Monit Assess

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Acid-treated pomegranate peel; An efficient biosorbent for the excision of hexavalent chromium from wastewater

Cited by 10 publications

References 63 publications

Effective Chromium (VI) Removal from Contaminated Water by Chemically Modified Litchi Chinensis Seed Powder: Characterization, Kinetic and Isotherm Studies

Effective Chromium (VI) Removal from Contaminated Water by Chemically Modified Litchi Chinensis Seed Powder: Characterization, Kinetic and Isotherm Studies

Study on the adsorption of Zn(II) and Cu(II) in acid mine drainage by fly ash loaded nano-FeS

Studies on ultrafast and remarkable removal of phosphate from sewage water by metal-organic frameworks

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