Salicylic Acid and 4-Nitroaniline Removal from Water Using Magnetic Biochar: An Environmental and Analytical Experiment for the Undergraduate Laboratory

Karunanayake, Akila G.; Dewage, Narada Bombuwala; Todd, Olivia A.; Essandoh, Matthew; Anderson, Renel; Mlsna, Todd; Mlsna, Deb

doi:10.1021/acs.jchemed.6b00154

Cited by 32 publications

(15 citation statements)

References 12 publications

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“…Biochar containing electroactive quinoid functional groups and polycondensed aromatic sheets can act as an electron shuttle to mediate electron-transfer reactions [19,23]. Within this context, several mechanisms can occur on the biochar surface, including redox reactions and donor-acceptor complex formation, with many of these mechanisms being pH dependent [33]. Furthermore, with respect to the sorption properties of biochar, it has been shown that biochar has a strong affinity for PAHs [20,30].…”

Section: Catalytic Activity Of Fe 3 O 4 -Wb With Respect To Pah Reducmentioning

confidence: 99%

Wood-Biochar-Supported Magnetite Nanoparticles for Remediation of PAH-Contaminated Estuary Sediment

et al. 2018

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Abstract:In this study, we investigated the ability of a magnetic wood biochar (WB)-based composite catalyst (Fe 3 O 4 -WB) to catalyze sodium persulfate (PS) for the remediation of estuary sediment contaminated with polycyclic aromatic hydrocarbons (PAHs). The effects of various critical parameters, including the catalyst dose and initial pH, were investigated. The degradation of the PAHs was found to be related to the number of rings in their structure. The results showed that Fe 3 O 4 -WB is an efficient catalyst for the removal of high-ring PAHs (HPAHs), with the highest degradation rates for the 6-, 5-, and 4-ringed PAHs being 90%, 84%, and 87%, respectively, for a PS concentration of 2 × 10 −5 M, catalyst concentration of 3.33 g/L, and pH of 3.0. That the reduction rate of the HPAHs was greater than that of the low-ring PAHs can be attributed to the strong affinity of the HPAHs for biochar derived from wood biomass. Overall, this study revealed that the WB-mediated electron transfer catalysis of the surface functional groups in a wide range of pH in the Fe 3 O 4 -WB/PS system and potentially application in the remediation of sediments contaminated with PAHs.

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Section: Catalytic Activity Of Fe 3 O 4 -Wb With Respect To Pah Reducmentioning

confidence: 99%

Wood-Biochar-Supported Magnetite Nanoparticles for Remediation of PAH-Contaminated Estuary Sediment

et al. 2018

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“…Preparation of magnetic biochar -Magnetic biochar was obtained by coprecipitation of Fe(II) and Fe(III) ions on the particles of previously prepared non-magnetic biochar, in alkali medium, following an experimental procedure similar to that proposed by Karunanayake et al [39].…”

Section: Methodsmentioning

confidence: 99%

“…Humins first underwent a thermal treatment previously proposed by Tosi et al [37] in order to get a crosslinked rigid foam. Then, magnetic biochar was obtained by chemical co-precipitation under alkaline conditions [39]. After that, adsorption kinetics and adsorption isotherms were performed by using methylene blue as a pollutant.…”

Section: Magnetic Biocharmentioning

confidence: 99%

A Humins-Derived Magnetic Biochar for Water Purification by Adsorption and Magnetic Separation

Lomenech

Hurel

Messina

et al. 2021

Waste Biomass Valor

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In this study, the use of magnetic biochar particles recovered from biorefinery by-products (humins) for adsorption of hydrophilic organic pollutants was investigated. The biochar was prepared by thermal treatment of crude humins followed by a grinding step after which a magnetic iron oxide was co-precipitated on the biochar surface. The resulting iron oxide content of the biochar composite was found to be 9 % by volume, and the presence of a characteristic Fe-O vibrational band was observed by FTIR-ATR. XPS analysis of Fe2p spectrum enabled the nature of iron oxide to be identified as maghemite. Finally, magnetometry measurements demonstrated the superparamagnetic properties of maghemite.The adsorption of methylene blue on the biochar composite was found to be fast (less than 1 hour at pH 6 with an initial concentration of methylene blue of 2•10 -5 mol.L -1 ). Kinetics data were satisfactorily modelled by both first and second order models. Freundlich and Langmuir models were applied to adsorption isotherms data. Maximum adsorption capacity (3.35•10 -5 mol.g -1 ), and Langmuir and Freundlich constants (2.33•10 4 L.mol -1 and 5.70•10 -5 mol 0.913 .L 0.087 .g -1 respectively) were found to be comparable to the average of those found in the literature. Electrostatic attraction between oppositely charged methylene blue and magnetic biochar was presumed to be the dominant interaction governing adsorption at environmental pH values. Lastly, a laboratory-scale experimental device with magnetic filtration under flow allowed the complete separation of the magnetic biochar composite from the liquid phase. This study shows that this magnetic biochar composite is a promising and economically interesting recovery route for biorefinery by-products and could be used for adsorption purposes.

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“…e pH was raised to 11 by adding 0.05 M NaOH solution, dropwise. After mixing for 60 min, the organic residues were removed by washing with distilled water (H 2 O) until the pH of the washing solution reached 7.0. e fine powdered modified biochar (FMBC) was vacuum-filtered and then dried overnight at 50°C in a hot air oven [18].…”

Section: Biochar Productionmentioning

confidence: 99%

Synthesis of Iron-Modified Biochar Derived from Rice Straw and Its Application to Arsenic Removal

Nguyen

Phạm

Thi

et al. 2019

Journal of Chemistry

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A novel iron-modified biochar (FMBC) derived from rice straw was synthesized using FeCl3 modification for efficient As(V) removal from aqueous solution. FTIR and SEM-EDX analyses were carried out to determine the mechanism involved in the removal process and also demonstrated that Fe had loaded successfully on the surface of modified biochar. The iron-modified biochar showed higher arsenic removal ability than the raw biochar. The iron-modified biochar showed a maximum adsorption with an initial solution pH of 5.0. Moreover, for the tested biochar, the As(V) removal kinetics data were well fitted by the pseudo-second-order model. Furthermore, the As(V) removal data upon being well fitted by the Langmuir model showed the maximal removal capacity of 28.49 mg/g. The simple preparation process and high adsorption performance suggest that the iron-modified biochar derived from rice straw could be served as an effective, inexpensive, and environmentally sustainable adsorbent to replace typical granular activated carbon (AC) for As(III) removal from aqueous solution.

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Salicylic Acid and 4-Nitroaniline Removal from Water Using Magnetic Biochar: An Environmental and Analytical Experiment for the Undergraduate Laboratory

Cited by 32 publications

References 12 publications

Wood-Biochar-Supported Magnetite Nanoparticles for Remediation of PAH-Contaminated Estuary Sediment

Wood-Biochar-Supported Magnetite Nanoparticles for Remediation of PAH-Contaminated Estuary Sediment

A Humins-Derived Magnetic Biochar for Water Purification by Adsorption and Magnetic Separation

Synthesis of Iron-Modified Biochar Derived from Rice Straw and Its Application to Arsenic Removal

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