Production of bio-waste granules and their evaluation as adsorbent for removal of hexavalent chromium and methylene blue dye

Jaiyeola, Oluwafikayo Olaoye; Chen, Haili; Albadarin, Ahmad B.; Mangwandi, Chirangano

doi:10.1016/j.cherd.2020.09.020

Cited by 14 publications

(7 citation statements)

References 30 publications

(48 reference statements)

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“…Furthermore, K 1 values decrease with increase in the initial concentration of MB dye, revealing that the adsorption of MB by RC-nZVI is a physical adsorption reaction. The removal of MB by biowaste granules also fitted to pseudo-first-order in a study performed by Jaiyeola et al and another study performed by Sahu et al They found that the adsorption of MB onto nZVI follows the pseudo-first-order kinetic model. The Elovich model effectively describes the interaction between a solid and liquid interface, and takes into account that the real solid surface is energetically heterogeneous and that the desorption process and interactions between adsorbed species have little effect on the adsorption kinetics .…”

Section: Resultsmentioning

confidence: 93%

Green Synthesis of Nano-Zero-Valent Iron Using Ricinus Communis Seeds Extract: Characterization and Application in the Treatment of Methylene Blue-Polluted Water

et al. 2021

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In this study, the removal of methylene blue dye (MB) from aqueous solution was examined using a novel green adsorbent to overcome the obstacles encountered in chemical methods. Ricinus communis (RC) aqueous seeds extract was herein used as a reducing and capping agent to synthesize a novel nano-zero-valent iron (RC-nZVI) for the adsorption of harmful MB. Structural and morphological characterization of the synthesized RC-nZVI were performed using several techniques, e.g., steady-state absorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and zeta potential. The maximum efficiency of the removal was 96.8% at pH 6 and 25 °C. According to the kinetics study results, the adsorption process obeys the pseudo-first-order model. The experimental equilibrium data were fitted to the Freundlich isotherm model, the maximum adsorption capacity reached was 61.37 mg·g–1, and the equilibrium parameters were determined. The synthesized RC-nZVI possesses good reusability and can be considered as a potential economic and environmentally friendly adsorbent.

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Section: Resultsmentioning

confidence: 93%

Green Synthesis of Nano-Zero-Valent Iron Using Ricinus Communis Seeds Extract: Characterization and Application in the Treatment of Methylene Blue-Polluted Water

et al. 2021

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“…Chromium ions and dyes can be released with the industrial effluents of various industries such as steel, electroplating, textile, tannery, leather, paper, food and cosmetics 1 , 2 . The presence of chromium ions and dyes in surface and groundwater has negative impacts on living organisms due to their high toxicity, carcinogenicity, and biorecalcitrance 3 , 4 .…”

Section: Introductionmentioning

confidence: 99%

The superior performance of silica gel supported nano zero-valent iron for simultaneous removal of Cr (VI)

Salama

Samy

Shokry

et al. 2022

Sci Rep

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Pure nano zero-valent iron (NZVI) was fabricated under optimum conditions based on material production yield and its efficiency toward acid blue dye-25 decolorization. The optimum prepared bare NZVI was immobilized with two different supports of silica and starch to fabricate their composites nanomaterials. The three different prepared zero-valent iron-based nanomaterials were evaluated for removal of hexavalent chromium (Cr(VI)). The silica-modified NZVI recorded the most outstanding removal efficiency for Cr(VI) compared to pristine NZVI and starch-modified NZVI. The removal efficiency of Cr(VI) was improved under acidic conditions and decreased with raising the initial concentration of Cr(VI). The co-existence of cations, anions, and humic acid reduced Cr(VI) removal efficiency. The removal efficiency was ameliorated from 96.8% to 100% after adding 0.75 mM of H2O2. The reusability of silica-modified NZVI for six cycles of Cr(VI) removal was investigated and the removal mechanism was suggested as the physicochemical process. Based on Langmuir isotherm, the maximal Cr(VI) removal capacity attained 149.25 mg/g. Kinetic and equilibrium data were efficiently fitted using the pseudo-second-order and Langmuir models, respectively confirming the proposed mechanism. Diffusion models affirmed that the adsorption rate was governed by intraparticle diffusion. Adsorption thermodynamic study suggested the spontaneity and exothermic nature of the adsorption process. This study sheds light on the technology that has potential for magnetic separation and long-term use for effective removal of emerging water pollutants.

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“…The biosorption process is more flexible in both design and operation parts, also the adsorbents, usually with a lower price, can be regenerated and reused after appropriate desorption processes. According to recent studies, various materials, such as treated waste newspaper (Dehghani et al 2016); fruit shell (Anandkumar & Mandal 2009); rice straw (Wu et al 2016); modified seaweed (Yang & Chen 2008); teawaste (Gupta & Balomajumder 2015); sawdust (Meghna & Mondal 2013); bio-waste granules (Jaiyeola et al 2020), banana peel (Chen et al 2022) and so on, have all been examined as biosorbents for Cr(VI) removal from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Production and optimisation of adsorbent materials from teawaste for heavy metal removal from aqueous solution: feasibility of hexavalent chromium removal – kinetics, thermodynamics and isotherm study

Mangwandi

Chen

2022

Water Practice and Technology

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A face-centred central composite experimental design scheme was used to find experimental conditions which would result in the Magnetic Bleached Teawaste (MBTW) adsorbent material produced have the optimum hexavalent chromium (Cr(VI)) removal capacity. Effect of treatment conditions, namely temperature (200 °C, 350 °C, 500 °C), duration of the heat treatment (2 h, 3 h, 4 h), the concentration of the iron chloride (0.02 g/g, 0.055 g/g, 0.09 g/g) added was investigated. The results obtained showed that the pyrolysis temperature and the amount of iron chloride added during treatment had significant effects on the performance of MBTW material in removal of both total chromium and Cr(VI). Increasing temperature from 200 °C to 500 °C, both Cr(VI) and total Cr removal would decrease. The material with optimum removal of Cr(VI) was used for the detailed adsorption study. The results from the detailed adsorption study indicated that the MBTW material has an excellent Langmuir removal capacity of Cr(VI) (269.9 mg/g). The Cr(VI) removal process also involved the reduction of the Cr(VI) to Cr(III). The removal process was shown to be temperature-dependent and endothermic. According to the FTIR analysis and the kinetic modelling results, chemisorption is the main mechanism responsible for the removal of the Cr(VI). The effect of background ions on the reduction of Cr(VI) was also investigated and the results show that presence of carbonate ions caused a huge reduction in removal of Cr(VI) whilst chloride ions had the least effect.

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Production of bio-waste granules and their evaluation as adsorbent for removal of hexavalent chromium and methylene blue dye

Cited by 14 publications

References 30 publications

Green Synthesis of Nano-Zero-Valent Iron Using Ricinus Communis Seeds Extract: Characterization and Application in the Treatment of Methylene Blue-Polluted Water

Green Synthesis of Nano-Zero-Valent Iron Using Ricinus Communis Seeds Extract: Characterization and Application in the Treatment of Methylene Blue-Polluted Water

The superior performance of silica gel supported nano zero-valent iron for simultaneous removal of Cr (VI)

Production and optimisation of adsorbent materials from teawaste for heavy metal removal from aqueous solution: feasibility of hexavalent chromium removal – kinetics, thermodynamics and isotherm study

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