Insights into the removal of Cr(VI) by a biochar–iron composite from aqueous solution: Reactivity, kinetics and mechanism

In this study potential adsorbent jute charcoal iron composite (JC-FeCs) was synthesized via co precipitation of iron composite on jute charcoal and utilized it for Cr (VI) removal from water. The surface morphology of composite were performed with advance techniques such as BET, FESEM, EDX, FTIR, XPS, AFM and HR-TEM to analyzed the surface functional groups and elements on the prepared composite. The influence of pH, JC-FeCs dose, time, and concentration on % removal of Cr (VI) were examined. Noteworthy, the JC-FeCs reveals excellent removal capacity of Cr (VI) (Qmax 92.33 mg/g) at 303K which is much better than those adsorbent reported in the literature. XPS analysis of adsorbent shows the existence of both Cr (VI) and Cr (III) peaks on JC-FeCs surface, which implied that Cr (VI) adsorption occurs on composite. Herein Cr (VI) was first adsorbed on JC-FeCs via electrostatic force of attraction, later it was partially reduced to Cr (III). Non-linear isotherm study suggests monolayer adsorption occurs on homogenous surface of JC-FeCs adsorbent due to greater value of R2 than other isotherm. Kinetic studies suggest that adsorption followed pseudo second order model with greater R2 value. Thermodynamic study indicate endothermic, spontaneous and physisorption adsorption process. The predicted result of Cr (VI) removal obtains from RSM model and the observed % removal were found close to each other indicate that quadratic model best explain the adsorption process. Desorption study shows the good regeneration ability of adsorbent in alkaline medium. Thus, this bio-composite could work as an effective adsorbent for mitigation of Cr (VI) from water in environmental pollution cleanup.

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“…5 (b). Similar observation for Cr (VI) removal was reported (Yang et al, 2015;Ghorbani et al, 2020;Yan et al,2021).…”

Section: Effect Of Jc-fecs Quantitysupporting

confidence: 89%

Mitigation of Cr (VI) from aqueous solution using jute charcoal iron composite (JC-FeCs): Response surface methodology (RSM)

Kumari

Tiwary

Yadav

2022

Preprint

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“…peak at 22.72° at 2θ value, indicating that Cr(VI) ions adsorbed onto GSB (Figure 2C). The XRD result of GSB confirms Cr(VI) adsorption on GSB, and the peaks at 22.72° correspond to Cr2O3 having a tetragonal crystalline phase, according to the inorganic crystalline library [56,57].…”

Section: Xrd Analysismentioning

confidence: 72%

“…However, upon Cr(VI) adsorption, the XRD spectrum of the grafted cellulose showed noticeably wider widths than those of the ungrafted samples and had a sharp peak at 22.72 • at 2θ value, indicating that Cr(VI) ions adsorbed onto GSB (Figure 2C). The XRD result of GSB confirms Cr(VI) adsorption on GSB, and the peaks at 22.72 • correspond to Cr 2 O 3 having a tetragonal crystalline phase, according to the inorganic crystalline library [56,57]. peak at 22.72° at 2θ value, indicating that Cr(VI) ions adsorbed onto GSB (Figure 2C).…”

Section: Xrd Analysismentioning

confidence: 76%

Removal of Cr(VI) from Wastewater Using Acrylonitrile Grafted Cellulose Extracted from Sugarcane Bagasse

Khan,

Ali,

Naz

et al. 2024

Molecules

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A highly efficient low-cost adsorbent was prepared using raw and chemically modified cellulose isolated from sugarcane bagasse for decontamination of Cr(VI) from wastewater. First, cellulose pulp was isolated from sugarcane bagasse by subjecting it to acid hydrolysis, alkaline hydrolysis and bleaching with sodium chlorate (NaClO3). Then, the bleached cellulose pulp was chemically modified with acrylonitrile monomer in the presence Fenton’s reagent (Fe+2/H2O2) to carry out grafting of acrylonitrile onto cellulose by atom transfer radical polymerization. The developed adsorbent (acrylonitrile grafted cellulose) was analyzed by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). Both raw cellulose and acrylonitrile grafted cellulose were used for chromium removal from wastewater. The effects of metal ion concentration, pH, adsorbent dose and time were studied, and their values were optimized. The optimum conditions for the adsorption of Cr(VI) onto raw and chemically modified cellulose were: metal ion concentration: 50 ppm, adsorbent dose: 1 g, pH: 6, and time: 60 min. The maximum efficiencies of 73% and 94% and adsorption capacities of 125.95 mg/g and 267.93 mg/g were achieved for raw and acrylonitrile grafted cellulose, respectively. High removal efficiency was achieved, owing to high surface area of 79.92 m2/g and functional active binding cites on grafted cellulose. Isotherm and kinetics studies show that the experimental data were fully fitted by the Freundlich isotherm model and pseudo first-order model. The adsorbent (acrylonitrile grafted cellulose) was regenerated using three different types of regenerating reagents and reused thirty times, and there was negligible decrease (19%) in removal efficiency after using it for 30 times. Hence, it is anticipated that acrylonitrile could be utilized as potential candidate material for commercial scale Cr(VI) removal from wastewater.

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“…These peaks reflect the chromium transfer from the solution to the adsorbent surface. Furthermore, by comparing these peaks with the inorganic crystalline system data library, it was found that the peaks at 44.12° (2θ value) correspond to the existence of chromium oxide specie, i.e., Cr 2 O 3 having a tetragonal crystalline phase [ 43 ]. The peak at 2θ values of 64.44° confirms the presence of chromium oxide [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Hexavalent Chromium (Cr(VI)) from Wastewater Using Amide-Modified Biochar

et al. 2023

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The utilization of biochar, derived from agricultural waste, has garnered attention as a valuable material for enhancing soil properties and serving as a substitute adsorbent for the elimination of hazardous heavy metals and organic contaminants from wastewater. In the present investigation, amide-modified biochar was synthesized via low-temperature pyrolysis of rice husk and was harnessed for the removal of Cr(VI) from wastewater. The resultant biochar was treated with 1-[3-(trimethoxysilyl) propyl] urea to incorporate an amide group. The amide-modified biochar was characterized by employing Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and X-ray diffraction (XRD) techniques. During batch experiments, the effect of various parameters, such as adsorbent dosage, metal concentration, time duration, and pH, on Cr(VI) removal was investigated. The optimal conditions for achieving maximum adsorption of Cr(VI) were observed at a pH 2, an adsorbent time of 60 min, an adsorbent dosage of 2 g/L, and a metal concentration of 100 mg/L. The percent removal efficiency of 97% was recorded for the removal of Cr(VI) under optimal conditions using amide-modified biochar. Freundlich, Langmuir, and Temkin isotherm models were utilized to calculate the adsorption data and determine the optimal fitting model. It was found that the adsorption data fitted well with the Langmuir isotherm model. A kinetics study revealed that the Cr(VI) adsorption onto ABC followed a pseudo-second-order kinetic model. The findings of this study indicate that amide-functionalized biochar has the potential to serve as an economically viable substitute adsorbent for the efficient removal of Cr(VI) from wastewater.

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Insights into the removal of Cr(VI) by a biochar–iron composite from aqueous solution: Reactivity, kinetics and mechanism

Cited by 36 publications

References 46 publications

Mitigation of Cr (VI) from aqueous solution using jute charcoal iron composite (JC-FeCs): Response surface methodology (RSM)

Mitigation of Cr (VI) from aqueous solution using jute charcoal iron composite (JC-FeCs): Response surface methodology (RSM)

Removal of Cr(VI) from Wastewater Using Acrylonitrile Grafted Cellulose Extracted from Sugarcane Bagasse

Efficient Removal of Hexavalent Chromium (Cr(VI)) from Wastewater Using Amide-Modified Biochar

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