A sustainable route for production of graphene oxide-contained nanostructured carbons from rice husk waste and its application in wastewater treatment

Zhang, Teng-Yuan; Liou, Tzong-Horng; Chiu, Shwu‐Jer; Hsu, Chun-Chia; Liu, Wenyang

doi:10.1016/j.eti.2023.103270

Cited by 7 publications

(2 citation statements)

References 69 publications

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“…The O1s spectra ( Figure 4 c) contained peaks at 532.3 and 533.7 eV. These were associated with C=O and O–C=O bonds, respectively [ 44 ]. The C–O functional groups in the MWCNTs would aid the π–π interaction between PNA molecules and the MWCNTs, thereby increasing the MWCNTs’ adsorption activity.…”

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Hazardous P-Nitroaniline from Wastewater by Using Surface-Activated and Modified Multiwalled Carbon Nanotubes with Mesostructure

Liou,

Huang

2024

Toxics

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P-nitroaniline (PNA) is an aniline compound with high toxicity and can cause serious harm to aquatic animals and plants. Multiwalled carbon nanotubes (MWCNTs) are a multifunctional carbon-based material that can be applied in energy storage and biochemistry applications and semiconductors as well as for various environmental purposes. In the present study, MWCNTs (CO2–MWCNTs and KOH–MWCNTs) were obtained through CO2 and KOH activation. ACID–MWCNTs were obtained through surface treatment with an H2SO4–HNO3 mixture. Herein, we report, for the first time, the various MWCNTs that were employed as nanoadsorbents to remove PNA from aqueous solution. The MWCNTs had nanowire-like features and different tube lengths. The nanotubular structures were not destroyed after being activated. The KOH–MWCNTs, CO2–MWCNTs, and ACID–MWCNTs had surface areas of 487, 484, and 80 m2/g, respectively, and pore volumes of 1.432, 1.321, and 0.871 cm3/g, respectively. The activated MWCNTs contained C–O functional groups, which facilitate PNA adsorption. To determine the maximum adsorption capacity of the MWCNTs, the influences of several adsorption factors—contact time, solution pH, stirring speed, and amount of adsorbent—on PNA adsorption were investigated. The KOH–MWCNTs had the highest adsorption capacity, followed by the CO2–MWCNTs, pristine MWCNTs, and ACID–MWCNTs. The KOH–MWCNTs exhibited rapid PNA adsorption (>85% within the first 5 min) and high adsorption capacity (171.3 mg/g). Adsorption isotherms and kinetics models were employed to investigate the adsorption mechanism. The results of reutilization experiments revealed that the MWCNTs retained high adsorption capacity after five cycles. The surface-activated and modified MWCNTs synthesized in this study can effectively remove hazardous pollutants from wastewater and may have additional uses.

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Section: Resultsmentioning

confidence: 99%

Efficient Removal of Hazardous P-Nitroaniline from Wastewater by Using Surface-Activated and Modified Multiwalled Carbon Nanotubes with Mesostructure

Liou,

Huang

2024

Toxics

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“…In this context, renewable and sustainable resources in the form of biowaste appear as especially important candidates for graphene precursors [ 19 ]. Along this line, the first attempts to obtain graphene-related materials from RH have recently been proposed [ 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Production of Graphene Membranes from Rice Husk Biomass Waste for Improved Desalination

Seitzhanova,

Azat,

Yeleuov

et al. 2024

Nanomaterials

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Inexpensive and efficient desalination is becoming increasingly important due to dwindling freshwater resources in view of climate change and population increase. Improving desalination techniques of brackish water using graphene-based materials has the possibility to revolutionize freshwater production and treatment. At the same time, graphene matter can be cheaply mass-produced from biowaste materials. In view of this, graphene material was obtained from a four-step production approach starting from rice husk (RH), including pre-carbonation, desilication, chemical activation, and exfoliation. The results showed that the produced samples contained a mixture of graphene layers and amorphous carbon. The activation ratio of 1:5 for carbonized RH and potassium hydroxide (KOH), respectively, provided higher graphene content than the 1:4 ratio of the same components, while the number of active layers remained unaffected. Further treatment with H2O2 did not affect the graphene content and exfoliation of the amorphous carbon. Preparation of the graphene material by the NIPS technique and vacuum filtration displayed different physicochemical characteristics of the obtained membranes. However, the membranes’ main desalination function might be related more to adsorption rather than size exclusion. In any case, the desalination properties of the different graphene material types were tested on 35 g/L saltwater samples containing NaCl, KCl, MgCl2, CaSO4, and MgSO4. The produced graphene materials efficiently reduced the salt content by up to 95%. Especially for the major constituent NaCl, the removal efficiency was high.

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Green and sustainable synthesis of mesoporous silica from agricultural biowaste and functionalized with TiO2 nanoparticles for highly photoactive performance

Liou,

Liu,

Liao

et al. 2024

Arabian Journal of Chemistry

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A sustainable route for production of graphene oxide-contained nanostructured carbons from rice husk waste and its application in wastewater treatment

Cited by 7 publications

References 69 publications

Efficient Removal of Hazardous P-Nitroaniline from Wastewater by Using Surface-Activated and Modified Multiwalled Carbon Nanotubes with Mesostructure

Efficient Removal of Hazardous P-Nitroaniline from Wastewater by Using Surface-Activated and Modified Multiwalled Carbon Nanotubes with Mesostructure

Production of Graphene Membranes from Rice Husk Biomass Waste for Improved Desalination

Green and sustainable synthesis of mesoporous silica from agricultural biowaste and functionalized with TiO2 nanoparticles for highly photoactive performance

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