Direct pseudomorphic transformation of silica from rice husk into organo-functionalized MCM-41

Sennoun, Lilia; Lee, Chun-Cheng; Fretel, Yohan; Clavié, Margaux; Subra, Gilles; Ladner, Yoann; Napoli, Alfredo; Galarneau, Anne; Hesemann, Peter; Mehdi, Ahmad

doi:10.1039/d4nj00715h

New J. Chem.

2024

DOI: 10.1039/d4nj00715h

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Direct pseudomorphic transformation of silica from rice husk into organo-functionalized MCM-41

Lilia Sennoun,

Chun-Cheng Lee,

Yohan Fretel

et al.

Abstract: To reduce the cost of silica-based materials, an agricultural waste, rice husk (RH), was transformed into higher valuable products such as MCM-41 and organo-functionalized MCM-41 in the frame of circular...

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Towards Achieving Circular Economy in the Production of Silica from Rice Husk as a Sustainable Adsorbent

Rodriguez-Otero,

Galarneau,

Drané

et al. 2024

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The growing concern over water pollution and waste management requires innovative solutions that promote resource efficiency within a circular economy. This study aims to utilize rice husk (RH) as a sustainable feedstock to develop highly porous silica particles and generate valuable by-products, addressing the dual challenges of waste reduction and water contamination. We hypothesize that optimizing the production of amorphous silica from acid-washed RH will enhance its adsorptive properties and facilitate the concurrent generation of bio-oil and syngas. Amorphous silica particles were extracted from acid-washed RH with a yield of 15 wt% using a combination of acid washing at 100 °C, pyrolysis at 500 °C, and calcination at 700 °C with controlled heating at 2 °C/min. The optimized material (RH2-SiO2), composed of small (60–200 nm) and large (50–200 µm) particles, had a specific surface area of 320 m2/g, with funnel-shaped pores with diameters from 17 nm to 4 nm and showed a maximum cadmium adsorption capacity of 407 mg Cd/g SiO2. Additionally, the pyrolysis process yielded CO-rich syngas and bio-oil with an elevated phenolic content, demonstrating a higher bio-oil yield and reduced gas production compared to untreated RH. Some limitations were identified, including the need for bio-oil upgrading, further research into the application of RH2-SiO2 for wastewater treatment, and the scaling-up of adsorbent production. Despite the challenges, these results contribute to the development of a promising adsorbent for water pollution control while enhancing the value of agricultural waste and moving closer to a circular economy model.

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Towards Achieving Circular Economy in the Production of Silica from Rice Husk as a Sustainable Adsorbent

Rodriguez-Otero,

Galarneau,

Drané

et al. 2024

Processes

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show abstract

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Direct pseudomorphic transformation of silica from rice husk into organo-functionalized MCM-41

Abstract: To reduce the cost of silica-based materials, an agricultural waste, rice husk (RH), was transformed into higher valuable products such as MCM-41 and organo-functionalized MCM-41 in the frame of circular...

Cited by 1 publication

References 68 publications

Towards Achieving Circular Economy in the Production of Silica from Rice Husk as a Sustainable Adsorbent

Towards Achieving Circular Economy in the Production of Silica from Rice Husk as a Sustainable Adsorbent

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