Removal of hexavalent chromium via an adsorption coupled reduction mechanism using olive oil derived carbon nano-onions

Ntuli, Themba D.; Mongwe, Thomas H.; Sikeyi, Ludwe L.; Mkhari, Orlette; Coville, Neil J.; Nxumalo, Edward N.; Maubane‐Nkadimeng, Manoko S.

doi:10.1016/j.enmm.2021.100477

Cited by 13 publications

(12 citation statements)

References 57 publications

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“…XPS analysis was performed for the investigation of the surface elemental composition. Figure 3d 71 The BET surface area of CNOs was obtained by using nitrogen adsorption and desorption isotherms. The BET adsorption isotherm is shown in Figure 4a, and the specific surface area of CNOs was determined to be 502.223 m 2 /g.…”

Section: Resultsmentioning

confidence: 99%

“…The C 1s peak can be deconvoluted into four peaks (Figure e) centered at 284.4, 285.5, 285.7, and 288.9 eV and ascribed to CC, C–C, C–O, and COO – bonding, respectively. The O 1s spectra in Figure f can be deconvoluted into three peaks positioned at 529.33, 530.66, and 532.05 eV, assigned to the C–O, C–O, and CO functional groups …”

Section: Results and Discussionmentioning

confidence: 99%

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Cost-Effective and Ecologically Sustainable Carbon Nano-Onions for Antibiotic Removal from Wastewater

Kumari,

Tripathi,

Awasthi

et al. 2023

Ind. Eng. Chem. Res.

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The discharge of antibiotics into the aquatic environment can become toxic and hazardous to both human health and the environment. Therefore, it is enormously essential to remove multiple antibiotics from the wastewater. In this work, carbon nano-onions (CNOs) were synthesized and used as effective adsorbents for the removal of 97% norfloxacin (NOR) and 99% tetracycline hydrochloride (TCH) antibiotics from wastewater. CNOs showed good adsorption efficiency, and the equilibrium period was also short. The adsorption studies were investigated with adsorbent dosages, adsorbate concentration, and pH. The maximum adsorption capacity (q max) was found to be 416.66 and 344.82 mg g–1 for TCH and NOR, respectively. CNOs have also shown admirable removal efficiency toward NOR and TCH from natural water samples such as dam water (97% TCH and 94% NOR), tap water (96% NOR and 93% TCH), and lake water (95% NOR and 93% TCH).

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Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Cost-Effective and Ecologically Sustainable Carbon Nano-Onions for Antibiotic Removal from Wastewater

Kumari,

Tripathi,

Awasthi

et al. 2023

Ind. Eng. Chem. Res.

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“…Currently, there is a pressing demand to develop the next generation of nanocarbons, including CNOs, using either eco-friendly technology or renewable biomass resources. Owing to the global transition towards sustainable carbon-based products, innovative approaches have been recently developed to synthesize CNOs from sustainable carbon precursors such as wood wool, [326] olive oil, [327] flaxseed oil, [328] citrus oil, [329] rice husk, [330] and bio-wastes. [331] The lack of adequate information on this topic, which is manifested by the low number of published papers, should not be directly interpreted as the topic being unimportant.…”

Section: Green Synthesis Of Cnos From Renewable Sourcesmentioning

confidence: 99%

Fluorescent Nanocarbons: From Synthesis and Structure to Cancer Imaging and Therapy

Ghasemlou,

PN,

Alexander

et al. 2024

Advanced Materials

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Nanocarbons are emerging at the forefront of nanoscience, with diverse carbon nanoforms emerging over the last two decades. Early cancer diagnosis and therapy, driven by advanced chemistry techniques, play a pivotal role in mitigating mortality rates associated with cancer. Nanocarbons, with an attractive combination of well‐defined architectures, biocompatibility, and nanoscale dimension, offer an incredibly versatile platform for cancer imaging and therapy. This paper aims to review the underlying principles regarding the controllable synthesis, fluorescence origins, cellular toxicity, and surface functionalization routes of several classes of nanocarbons: carbon nanodots, nanodiamonds, carbon nanoonions, and carbon nanohorns. This review also highlights recent breakthroughs regarding the green synthesis of different nanocarbons from renewable sources. It also presents a comprehensive and unified overview of the latest cancer‐related applications of nanocarbons and how they could be designed to interface with biological systems and work as cancer diagnostics and therapeutic tools. The commercial status for large‐scale manufacturing of nanocarbons is also presented. Finally, it proposes future research opportunities aimed at engendering modifiable and high‐performance nanocarbons for emerging applications across medical industries. This work is envisioned as a cornerstone to guide interdisciplinary teams in crafting fluorescent nanocarbons with tailored attributes that can revolutionize cancer diagnostics and therapy.This article is protected by copyright. All rights reserved

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“…The overall specific surface area grows in proportion to the amount of biosorbent, resulting in more adsorption sites. When the solution's Cr(VI) content is known, after the adsorption equilibrium, the residual Cr(VI) in the medium constantly declines, and its elimination ratio steadily rises until it stabilizes [58,59]. The quantity of Cr(VI) ions is constrained because the total amount of chromium (VI) in the solution is constant, and since the concentration of biosorbent rises, less adsorption occurs per unit of biosorbent [59].…”

Section: Biosorbent Dosagementioning

confidence: 99%

Production of hydrochar from corn silk by hydrothermal carbonization technique and its modification for more effective removal of Cr(VI)

Ekinci

2023

J Chinese Chemical Soc

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The objective of this project was to develop a new bioproduct that will utilize agricultural waste and modify the product to increase its present adsorption capacity. After the hydrothermal carbonization of corn silk, a novel hydrochar was generated and treated using sulfuric acid to boost its adsorption capacity. FT‐IR, SEM–EDX, TGA, and BET surface analysis studies were used to analyze the structure of the produced biosorbents. According to the EDX analysis results, there are C, H, and N elements in the hydrochar structure, and the treated hydrochar contains S in addition to these elements. While the presence of several functional groups was indicated by FT‐IR data, post‐adsorption EDX analysis proved that Cr ions were adhering to hydrochar. The proper parameters for the adsorption processes for both biosorbents were established. By analyzing the outcomes of kinetics tests at various concentrations and isotherm experiments, the adsorption procedure was identified. The pseudo‐second‐order kinetic model was shown to be consistent with the kinetic pathways of adsorptions. Although the results of the isotherm experiments also suited the Langmuir isotherm, the Freundlich isotherm had higher R2 values and was more consistent with the results. The outcomes demonstrated that sulfuric acid‐modified hydrochar offered greater Cr(VI) adsorption capacity. qm values defining the maximum adsorption capacities of HC and THC at a temperature of 333 K were estimated to be 263.16 and 294.12 mg g−1, in that order. Based on the qm values, the adsorption capabilities of HC and THC were compared with those of a few other adsorbents. THC (29.11 m2 g−1) had a 29% larger surface area than HC (22.57 m2 g−1), according to the surface area of BET test results.

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Removal of hexavalent chromium via an adsorption coupled reduction mechanism using olive oil derived carbon nano-onions

Cited by 13 publications

References 57 publications

Cost-Effective and Ecologically Sustainable Carbon Nano-Onions for Antibiotic Removal from Wastewater

Cost-Effective and Ecologically Sustainable Carbon Nano-Onions for Antibiotic Removal from Wastewater

Fluorescent Nanocarbons: From Synthesis and Structure to Cancer Imaging and Therapy

Production of hydrochar from corn silk by hydrothermal carbonization technique and its modification for more effective removal of Cr(VI)

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