Cements obtained from rice hull: Encapsulation of heavy metals

Romano, Jonatas S.; Rodrigues, Fabiana Passos

doi:10.1016/j.jhazmat.2007.11.051

Cited by 12 publications

(6 citation statements)

References 29 publications

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“…Cement manufacturing requires high energy and resource consumption leading to significant CO 2 footprints (Ludwig and Zhang, 2015;Benhelal et al, 2013). Substantial efforts have been made in developing alternative raw materials and adjusting clinker composition to address the challenges for the sustainable development of the cement industry (Zhu et al, 2021;Lin et al, 1996;Omotoso et al, 1995;Romano and Rodrigues, 2008;Goh and Gan, 1996;Pang et al, 2022;Cuesta et al, 2021). Industrial by-products such as iron and steel making slag, electroplating sludge, and metal surface galvanic sludge are being investigated as alternative raw materials for clinker production (Pérez-Villarejo et al, 2015;Silva et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

V and Cr substitution in dicalcium silicate under oxidizing and reducing conditions – Synthesis, reactivity, and leaching behavior studies

Ahmed

Cuijpers²,

Schollbach³

et al. 2023

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

V and Cr substitution in dicalcium silicate under oxidizing and reducing conditions – Synthesis, reactivity, and leaching behavior studies

Ahmed

Cuijpers²,

Schollbach³

et al. 2023

Journal of Hazardous Materials

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“…Rice husk is an agricultural residue containing organic materials (lignin, carbohydrates, cellulose, etc.) and inorganic component (about 10% of silica) [15]. Rice husk ash contains approximately 99 wt% silica [3].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…Adsorption studies were carried out at 25˚C under batch mode using a orbital shaker at constant agitating speed of 200 rpm. The effect of contact time (0, 1, 5, 15, 30, 45, 60, 90, and 120 min), initial dye concentration (5,10,15,20,25, and 50 mg/L), and pH (4, 7, 9, and 11) on color removal were studied in a series of kinetic and equilibrium experiments. Adsorbent dose was 1 g/L.…”

Section: Dye Sorptionmentioning

confidence: 99%

Kinetic and equilibrium study of methylene blue adsorption using H2SO4− activated rice husk ash

Kaykıoğlu

Güneş

2016

Desalination and Water Treatment

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A B S T R A C TThe objective of this study is to evaluate the performance of H 2 SO 4 − activated rice husk ash (ARHA) (burned at different temperatures (300-550˚C) as compared to granular activated carbon (GAC) in the removal of methylene blue (MB) from aqueous solution. Batch studies were performed to evaluate the influences of various experimental parameters like pH (4, 7, 9, and 11), initial concentration (5, 10, 15, 20, 25, and 50 mg/L), and contact time (0, 1, 5, 15, 30, 45, 60, 90, and 120 min). BET surface areas for ARHA300 (burned at 300˚C) and ARHA550 (burned at 550˚C) were determined as 143 and 68 m 2 /g, respectively. It was observed that the dye uptake by GAC and ARHA300 were not changed significantly when the pH of dye solution was increased from 4 to 11. Uptakes of dye were rapid and the adsorption increased with increasing contact time in all experiments. According to the R 2 values for the adsorption of MB on ARHA300, ARHA500, and GAC, Langmuir model yields fit better than the Freundlich model. The maximum adsorption capacity, q max of ARHA300 (44.25 mg/g), had the highest value. The pseudo-second-order kinetic model yields the best fit for adsorption on ARHA300 and ARHA550 and the correlation coefficients R 2 of the model for the linear plots are very close to 1 at various concentrations.

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“…The most common approaches are encapsulation of heavy metals within a glass, glass-ceramic, or cementitious structures. [22][23][24][25] The aim of this work was focused on encapsulation of heavy metals adsorbed by rice husk within a porous glass-ceramic structure using vitrified bottom ash from municipal solid waste incinerators (MSWI), which in fact is other products based on waste materials. The reason relied on the economic aspects of treating the rice husk.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Pb and Cd in rice husk and their immobilization in porous glass‐ceramic structures

Sharifikolouei

Baino

Galletti

et al. 2019

Int J Applied Ceramic Tech

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Rice husk, an agricultural waste, is abundantly available in many countries such as China, India, Brazil, US, and South East Asia. Despite the massive production of rice husk, it is mainly disposed to landfill. In this work, utilization of rice husk for a potential waste-water treatment is evaluated, along with subsequent encapsulation of the adsorbed heavy metals (Pb and Cd) inside a porous glass-ceramic. Vitrified bottom ash (another source of waste) was mixed with foaming agents in different weight ratios (40:60, 50:50, and 60:40) to prepare a glass matrix for encapsulation of Pb-/ Cd-loaded rice husk. It was shown that using 40 wt% vitrified bottom ash with 60 wt% foaming agents leads to a foam glass with the best pore size distribution. Therefore, this batch was further mixed with 70 volume% (5 wt%) heavy metal-loaded rice husk and was heat-treated at 750°C for 3 hours. The final glass-ceramic porous structure was char acterized using SEM, XRD, compression test, and it was shown that it is safe to be used as it passes the EN12457-2 leaching test.

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Cements obtained from rice hull: Encapsulation of heavy metals

Cited by 12 publications

References 29 publications

V and Cr substitution in dicalcium silicate under oxidizing and reducing conditions – Synthesis, reactivity, and leaching behavior studies

V and Cr substitution in dicalcium silicate under oxidizing and reducing conditions – Synthesis, reactivity, and leaching behavior studies

Kinetic and equilibrium study of methylene blue adsorption using H2SO4− activated rice husk ash

Adsorption of Pb and Cd in rice husk and their immobilization in porous glass‐ceramic structures

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