Removal of vanadium from aqueous solution using a red mud modified saw dust biochar

Ghanim, Bashir; Murnane, John G.; O’Donoghue, Lisa M.T.; Courtney, Ronan; Pembroke, J. Tony; O’Dwyer, Thomas F.

doi:10.1016/j.jwpe.2019.101076

Cited by 51 publications

(20 citation statements)

References 47 publications

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“…Adsorption processes depend strongly on the surface chemistry and morphology of the adsorbent (Ghanim et al 2020). The BET N 2 surface areas of CSB and SB were 36.517 m 2 /g and 15.526 m 2 /g respectively.…”

Section: Characterization Of Adsorbentmentioning

confidence: 99%

Adsorption of Co(II) from aqueous solution using municipal sludge biochar modified by HNO3

Hu¹,

Zhang²,

Chen³

et al. 2021

Water Science and Technology

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Herein adsorption studies were proposed on a carboxylated sludge biochar (CSB) material modified by HNO3 to assess its capacity in the removal of cobalt from aqueous solution. The as-prepared sludge biochar material were characterized by Brunaure-Emmett-Teller (BET), Fourier transform infrared (FT-IR), Thermogravimetric analysis (TGA), Energy-dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The isotherm process could be well described by Langmuir isotherm model. The adsorption kinetics indicated that cobalt adsorption followed pseudo-second-order kinetic model. The mechanism between Co(II) and biochar involved electrostatic interaction, ion exchange, surface complexation and physical function. The adsorption capacity on CSB was as high as 72.27 mg·g−1, surpassing original sludge biochar (SB). This is due to the fact that CSB had abundant oxygen-containing functional groups and many hydroxyls, as well as, the BET surface areas increased when SB was modified by HNO3, which stimulate adsorption effect. Therefore, this work shows that CSB could be used as an efficient adsorbent to remove Co(II) in the wastewater.

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Section: Characterization Of Adsorbentmentioning

confidence: 99%

Adsorption of Co(II) from aqueous solution using municipal sludge biochar modified by HNO3

Hu¹,

Zhang²,

Chen³

et al. 2021

Water Science and Technology

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“…Industrial processes account for a significant level of both organic and inorganic pollutant emission to air, soil and water. 1,2 In particular, contamination of natural water resources with heavy metals has become increasingly problematic due to adverse impacts on the environment, causing serious problems worldwide with a cumulative and harmful effect on human health. 3 While some heavy metals from natural sources enter the environment, industrial release accounts for the largest proportion.…”

Section: Introductionmentioning

confidence: 99%

“…3 While some heavy metals from natural sources enter the environment, industrial release accounts for the largest proportion. 2 Heavy metals such as Cr, Cd, Hg, As and Pb are harmful to human health 4 and their toxicity to living organisms depends greatly on their biodegradability and bioavailability. 5 Chromium (Cr) is a natural element found in soil, animals and plants and in its most stable form, Cr(III) can be an essential element in human nutrition.…”

Section: Introductionmentioning

confidence: 99%

“…4,8 In this regard, biomass/biowaste and their derivative residues have been studied as adsorbents for contaminants and have been shown to be effective for removal of metals from soils and wastewaters. 2,5 Waste-derived materials such as low-cost agricultural biomass, sewage sludge and industrial effluents can be converted by thermal treatment to biochar or hydrochar to act as effective adsorbents for a range of metals from wastewater. 14,15 While these biosorbents have different physicochemical characteristics, their ability to adsorb contaminants from a variety of waste streams, including heavy metal removal, is mainly attributable to their surface characteristics, oxygenated functional groups, high cation-exchange capacity, aromatic carbon structure and high mineral content.…”

Section: Introductionmentioning

confidence: 99%

“…7,25 Chemical modification is a very useful method which can provide the desired adsorption characteristics by forming and/or exposing more active sites. 2 Acid modification is applied using various oxidants, leading to more acidic functional groups on the adsorbent surface and the removal of mineral elements. Treatment of biochar using H 2 SO 4 has been reported in the literature, improving its catalytic activity 26 and increasing its capacity for contaminant removal, such as removal of the antibiotic sulfamethazine frequently found in soil and water environments 27 and removal of Al from acidic soils.…”

Section: Introductionmentioning

confidence: 99%

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Removal of hexavalent chromium (Cr(VI)) from aqueous solution using acid‐modified poultry litter‐derived hydrochar: adsorption, regeneration and reuse

Ghanim

Leahy

O’Dwyer

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Chromium (Cr) is widely used in industrial processes and is considered a major source of pollution when released to the environment. Of particular concern, hexavalent chromium (Cr(VI)) is amongst the most toxic heavy metals affecting human health and living organisms when fugitive emissions contaminate aqueous environments. Consequently, its removal and recovery are priorities for environmental remediation in the context of the circular economy. In this study, modified hydrochar (MHC) was generated by hydrothermal carbonisation of acid-treated (H 2 SO 4 ) poultry litter (PL) and investigated for its ability to adsorb Cr(VI) from aqueous solution in batch studies. Recovery of Cr(VI) and the regeneration potential of MHC were also evaluated.RESULTS: Results indicated that Cr(VI) adsorption was strongly pH dependent, demonstrating an inverse relationship between solution pH and Cr(VI) uptake. A maximum adsorption capacity of 26.2 mg g −1 was achieved in 90 min at pH 2. Under optimal conditions, adsorption kinetics followed a pseudo-second-order kinetic model and the adsorption isotherm fitted most closely with the Langmuir model. Thermodynamic studies indicated that the adsorption process of Cr(VI) onto the MHC was exothermic and spontaneous. Regeneration studies demonstrated that the MHC can be re-used up to four times without significant loss of capacity to adsorb Cr(VI).CONCLUSIONS: Modified PL hydrochar offers potential as a low-cost, environmentally friendly solution for Cr(VI) adsorption in wastewater treatment applications. The ability of Cr(VI) to desorb from MHC demonstrates strong potential for Cr(VI) recovery and regeneration of the adsorbent.

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A review on preparation, surface enhancement and adsorption mechanism of biochar‐supported nano zero‐valent iron adsorbent for hazardous heavy metals

Awang

Salleh

Aziz

et al. 2022

J of Chemical Tech & Biotech

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Heavy metal pollution of water is a global concern, which adversely affects human health because of its resistance to biodegradation and thus its transmission in the food chain via bioaccumulation. Nano zerovalent iron (nZVI) is very effective for the removal of heavy metals and is cost effective in terms of production. However, the main problems of nZVI are agglomeration and ease of oxidation. Several stabilization materials have been implemented to limit the aggregation of nZVI, such as silica, activated carbon and biochar. In comparison, as a support material, biochar possesses a large surface area, high stability and strong adsorption capacity, as well as being obtainable from various types of materials. Thus, this work aims to establish the opportunities available on the use of biochar-supported nZVI in utilizing its ability to stabilize and immobilize the nZVI. This review also reports the preparation, modification and surface enhancement of biochar, nZVI and biochar-nZVI for practical use as adsorbents. This review shows that modifications of the nZVI surface can help in their stabilization and reduction of aggregation. Additionally, this review is able to increase one's understanding of heavy metal sorption behavior by biochar-supported nZVI as it is the important as heavy metal sorption is driven based on biochar-nZVI type and heavy metal species which involve numerous mechanisms, including physical binding, complexation, ion exchange, surface precipitation and electrostatic interactions. Furthermore, this research reviews the adsorption parameters, including the crucial adsorption mechanism of heavy metals onto biochar-nZVI; the reusability of the biochar-nZVI is also discussed in this work.

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Removal of vanadium from aqueous solution using a red mud modified saw dust biochar

Cited by 51 publications

References 47 publications

Adsorption of Co(II) from aqueous solution using municipal sludge biochar modified by HNO3

Adsorption of Co(II) from aqueous solution using municipal sludge biochar modified by HNO3

Removal of hexavalent chromium (Cr(VI)) from aqueous solution using acid‐modified poultry litter‐derived hydrochar: adsorption, regeneration and reuse

A review on preparation, surface enhancement and adsorption mechanism of biochar‐supported nano zero‐valent iron adsorbent for hazardous heavy metals

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