Alkali-treated Carbonized Rice Husk for the Removal of Aqueous Cr(VI)

Mukri, Bhaskar Devu; Krushnamurty, K.; Chowdhury, Arif; Suryakala, Duvvuri; Subrahmanyam, Ch.

doi:10.15376/biores.11.4.9175-9189

Cited by 12 publications

(4 citation statements)

References 31 publications

(32 reference statements)

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“…Sunflower straw is one of the main sources of agricultural waste. The total production of sunflower seeds is estimated to be 175.8 million tons for September 2016, which could generate a total of 527.4 million tons of sunflower straw calculated according to the ratio of sunflower straw and sunflower production in China (Bi et al 2009;Bao 2014;Mucri et al 2016). The disposal of agricultural waste has been a crucial concern for the last two decades in light of environmental pollution and global climate changes (Fu et al 2016).…”

Section: Introductionmentioning

confidence: 99%

The Effects of Pre-treatments and Low-temperature Pyrolysis on Surface Properties of Biochar from Sunflower Straw as Adsorption Material

Song¹,

Shi²,

Fu³

et al. 2016

BioResources

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Carbon adsorbent materials that were prepared from sunflower straw by a combination of pre-treatment and low-temperature pyrolysis showed better adsorption compared with untreated carbon. Four different pretreatment agents (steam, alkali (KOH), phosphoric (H3PO4), and salt (ZnCl2)) were analyzed with respect to their effects on the maximum surface area and the micropore area. Samples were measured by thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), surface area analysis, and pore size analysis. The surface area, pore volume, and N2-adsorption capacity of the samples were closely correlated with the pre-treating agent. A biochar with a maximum surface area of 877.6 m 2 /g and a micropore area of 792.8 m 2 /g was prepared with phosphoric acid (H3PO4) as the pre-treatment agent at a temperature of 400 °C. The main result of the one-stage pre-treatment procedure was the number of micropores. The two-stage, low-temperature pyrolysis procedure focused on the volume of the pores. Carbonized sunflower straw, with pretreated and lowtemperature pyrolysis procedures, was judged to be a highly effective and economic method to prepare carbon adsorbents.

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Section: Introductionmentioning

confidence: 99%

The Effects of Pre-treatments and Low-temperature Pyrolysis on Surface Properties of Biochar from Sunflower Straw as Adsorption Material

Song¹,

Shi²,

Fu³

et al. 2016

BioResources

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“…The adsorption capacity ( Q e ) and adsorption efficiency of adsorbates can be evaluated by using the following formulas respectively: Where C o and C e represent initial and equilibrium concentration of adsorbates, M is the weight of adsorbent in gram, V is the volume of solution in liter used in the experiment. The adsorption capacity was obtained from the mass balance of the adsorbent in the system …”

Section: Methodsmentioning

confidence: 99%

“…The adsorption capacity was obtained from the mass balance of the adsorbent in the system. 54 ■ RESULTS AND DISCUSSION Structure and Morphology of Ni−Co−S/SDS Nanocomposites. In order to find the structure and morphology of prepared nanocomposites, initially XRD, TEM, SEM, EDX, TGA, and XPS measurements were performed.…”

Section: ■ Introductionmentioning

confidence: 99%

Superadsorbent Ni–Co–S/SDS Nanocomposites for Ultrahigh Removal of Cationic, Anionic Organic Dyes and Toxic Metal Ions: Kinetics, Isotherm and Adsorption Mechanism

Chowdhury

Khan

Kumari

et al. 2019

ACS Sustainable Chem. Eng.

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Novel adsorbent Ni–Co–S/SDS (nickel cobalt sulfide/sodium dodecyl sulfate) nanocomposites have been synthesized by a simple and eco-friendly approach using water as a solvent at low temperature. The prepared nanocomposites structure and morphology were studied by powder XRD, SEM, TEM, XPS, FT-IR, TGA, and also the surface area and surface charge of the adsorbents were measured by BET and ζ-potential. These nanocomposites showed an excellent adsorption property for both cationic {crystal violet (CV), rhodamine B (RhB), methylene blue (MB), Nile blue A (NB)}, anionic {methyl orange (MO) and Congo red (CR)} organic dyes and Cr(VI) metal ions. They exhibited maximum adsorption capacity 3598.23 mg g–1 for CR, 3284.08 mg g–1 for MO, 4417.79 mg g–1 for NB, 3598.23 mg g–1 for CV, 1451.64 mg g–1 for MB, 773.47 mg g–1 for RhB and 583.67 mg g–1 for Cr(VI) ions respectively, which are higher adsorption capacities than reported and exhibited an efficient adsorption property for both cationic and anionic dyes. Furthermore, nanocomposites showed adsorption efficiencies greater than 95% after regenerated and reused up to five times. Moreover, it followed pseudo-second-order kinetics and an isotherm best fit with the modified Zhu and Gu model. Based on the adsorption studies, FT-IR and ζ-potential measurements studies confirm that the hydrogen bonding and electrostatic interactions are the predominating factors for first step adsorption process and second step is hydrophobic interaction between adsorbates. Overall, remarkable adsorption capacity and reusability of Ni–Co–S/SDS nanocomposites elucidate the scope as an environmental remedy for industrial applications.

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“….02 mg/g maximum adsorption capacity to Cr(VI) was got by the biochar produced from rice husk heated at 700°C with NaOH for 5 h got. (B.D Mukri, 2016)…”

mentioning

confidence: 98%

Carbon Nano-Sphere Derived From Crop Residues by Acidic Lithium Bromide Treatment and as an Excellent Adsorbent to Both Heavy Ions and Methyl Orange

Chen

Li³

et al. 2021

Preprint

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Carbon spheres, as a widely used carbon material, has attracted extensive attentions. The hydrothermal carbonization (HTC) method was a promising candidate for production of carbon-sphere. But the raw lignocellulose was natural resistant and hardly transformed into the carbon-spheres during HTC. Herein, acidic lithium bromide (LiBr) was supplied in the HTC process to break the resistance of lignocellulose and promoted the nano-carbon spheres forming in mild conditions: 140°C for 150 min. The carbon spheres from raw corn stover showed decent morphology properties and abundant functional groups, which was better than that from pine and poplar wood. It led to the high removal efficiency of the biochar-corn stover to both heavy ions and methyl orange in the waste water. Meanwhile, the filtrate under the optimal reaction was already reused. After five runs, the recycling showed slight effect on the morphology properties and the adsorption capability of biochar. These results verified the practical production of biochar spheres from lignocellulose in mild conditions, which provided more potential for the synthesis of novel biomass-based materials for wide applications.

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Alkali-treated Carbonized Rice Husk for the Removal of Aqueous Cr(VI)

Cited by 12 publications

References 31 publications

The Effects of Pre-treatments and Low-temperature Pyrolysis on Surface Properties of Biochar from Sunflower Straw as Adsorption Material

The Effects of Pre-treatments and Low-temperature Pyrolysis on Surface Properties of Biochar from Sunflower Straw as Adsorption Material

Superadsorbent Ni–Co–S/SDS Nanocomposites for Ultrahigh Removal of Cationic, Anionic Organic Dyes and Toxic Metal Ions: Kinetics, Isotherm and Adsorption Mechanism

Carbon Nano-Sphere Derived From Crop Residues by Acidic Lithium Bromide Treatment and as an Excellent Adsorbent to Both Heavy Ions and Methyl Orange

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