Valorization of sugar beet waste as a foaming agent for metakaolin geopolymer activated with phosphoric acid

Rashad, Alaa M.; Gharieb, Mahmoud; Shoukry, H.; Mokhtar, M.M.

doi:10.1016/j.conbuildmat.2022.128240

Cited by 32 publications

(11 citation statements)

References 77 publications

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“…Moreover, it can be seen from Figure S5 that the geopolymer with higher water/binder ratio exhibits larger porosity, which should be the result of free water evaporation. As for the AC‐templated samples, we can see that with increasing AC dosages, the porosity of the resultant geopolymers increases accordingly, and the geopolymer with 30 wt.% of AC exhibits a high porosity of 74.69% after removing the template, which is at par with those porous geopolymer foams prepared using Al powder or other foaming agents, 12,23 , 24 suggesting that the AC as hard template can also significantly improve the porosity of PAG. Furthermore, these pores can promote the dispersity of the MnO x species and can also optimize the oxidation state of the Mn species thus enhancing the SCR reactivity, which are discussed in detail in the following part.…”

Section: Resultsmentioning

confidence: 86%

“…reported the preparation of PAG foams using limestone as pore forming agent, where the acidic environment of the fresh paste provoked the chemical decomposition of added carbonates with gas release (CO 2 ) and consequent foam formation, and the resultant geopolymer foam exhibited a high porosity of ∼70%. Recently, Rashad et al 24 . investigated the feasibility of the sugar beet waste as renewable foaming agent for the preparation of porous PAG.…”

Section: Introductionmentioning

confidence: 99%

“…Gualtieri et al 23 reported the preparation of PAG foams using limestone as pore forming agent, where the acidic environment of the fresh paste provoked the chemical decomposition of added carbonates with gas release (CO 2 ) and consequent foam formation, and the resultant geopolymer foam exhibited a high porosity of ∼70%. Recently, Rashad et al 24 investigated the feasibility of the sugar beet waste as renewable foaming agent for the preparation of porous PAG. Their results confirmed that the incorporation of sugar beet waste in PAG not only improved the total porosity of geopolymer foam to 61.2% but also facilitated the water vapor mobility in and out of the geopolymer-hardened skeleton, thereby enhancing its working durability.…”

Section: Introductionmentioning

confidence: 99%

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Manganese‐enhanced porous phosphoric acid–based geopolymer templated by carbon for efficient NH₃‐SCR of NO_x

Liu

Zhang

Chen

et al. 2022

Int J Applied Ceramic Tech

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Geopolymer‐based ceramics as catalysts or catalyst supports have attracted tremendous interests in recent years owing to their low‐cost and zeolite‐like structure characteristics. However, most of the reported works focus on alkaline‐based geopolymers, whereas the catalytic performance of acid based geopolymer has not yet been evaluated. This study aims to investigate the application potential of phosphoric acid–based geopolymer (PAG) for selective catalytic reduction (SCR) of NOx with NH3. To this end, the SCR reactivity of PAG and metal oxide (MnOx)‐loaded PAG were evaluated. Moreover, an activated carbon‐based hard template route was proposed for further enhancing the SCR reactivity of the PAG‐based catalyst. The as‐prepared catalyst under the optimal condition exhibited a high NO conversion greater than 85% in a wide temperature range of 250–350°C, which is among the top literature‐reported values, demonstrating its promising application prospect. A systematical X‐ray diffraction, X‐ray photoelectron spectroscopy, field emission scanning electron microscopy, Brunauer–Emmet–Teller, NH3‐temperature‐programed desorption, and H2‐temperature‐programed reduction spectroscopic analyses were also conducted to better understand the structure evolution of PAG under elevated temperature and the SCR catalytic mechanism of the acid‐based geopolymer catalysts. This study would provide valuable information on the potential application prospect of PAG and its modified form for efficient NOx removal.

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Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Manganese‐enhanced porous phosphoric acid–based geopolymer templated by carbon for efficient NH₃‐SCR of NO_x

Liu

Zhang

Chen

et al. 2022

Int J Applied Ceramic Tech

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“…In this RSL's bibliographic portfolio, seven studies have been dedicated to the investigation of porous SAPGs. H 2 O 2 , aluminum and iron powders, and carbonate lime residue (a by-product of the sugar beet-making industry) have been successfully evaluated as foaming agents [77][78][79]. Porous SAPG using activated carbon as a foaming agent showed high NO x conversion (greater than 85%) over a wide temperature range (from 250-350 • C) [80], and the possibility of CO 2 /N 2 capture with high IAST selectivity [81].…”

Section: Porous Sapgmentioning

confidence: 99%

Acid Activation in Low-Carbon Binders: A Systematic Literature Review

Park,

Pimenta,

Bezerra

2023

Buildings

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Geopolymers have emerged as an alternative binding material to Ordinary Portland Cement (OPC). Recently, there has been an increase in studies exploring the synthesis of these materials using acid activation rather than traditional alkaline activation. This approach offers benefits such as good strength at an early age, better thermal properties, and a chemical activator that emits less carbon to be produced. In addition, it provides resistance to efflorescence and leaching, which are common challenges associated with alkali-activated products. This work analyzed the scientific advances in acid activation in synthesizing an alternative binder to OPC. To this end, a systematic review of the last five years of scientific literature was carried out using the Systematic Review for Engineering and Experiments (SREE) method. The results show a notable increase in research focused on acid activation over the last few years. The acid activators were always phosphate solutions, mainly phosphoric acid. Metakaolin was the most tested precursor, followed by fly ash, and volcanic ash. The research requires improvements in the methodological quality, providing data on molar ratios (Al/P, Si/Al, and Si/P), Liquid/Solid mass ratio, activator solution molarity, and curing process, in addition to statistical treatment and comparison of results. There exists a paucity of diversity in the examined precursors, activators, and additives. Future research developments need to clarify the behavior of mechanical resistance over time, better curing process, water resistance, durability, and the role of iron, magnesium, and calcium silicates and/or oxides. The paper identifies the main research gaps in the area and functions as a database, guiding researchers in selecting raw materials, dosing methodology, and curing processes.

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“…Rashad et al (2023) 88 manufactured SAP geopolymers from metakaolin using sugar beet waste as a foaming agent and investigated the thermal insulation capabilities of the resulting samples. As a result of applying 6% foaming agent, the lowest thermal conductivity of the produced geopolymers was 0.08 W m −1 K −1 .…”

Section: Properties Of Phosphate-activated Geopolymers and Applicationmentioning

confidence: 99%

Phosphate-activated geopolymers: advantages and application

Goryunova,

Gahramanli,

Muradkhanli

et al. 2023

RSC Adv.

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Valorization of sugar beet waste as a foaming agent for metakaolin geopolymer activated with phosphoric acid

Cited by 32 publications

References 77 publications

Manganese‐enhanced porous phosphoric acid–based geopolymer templated by carbon for efficient NH₃‐SCR of NO_x

Manganese‐enhanced porous phosphoric acid–based geopolymer templated by carbon for efficient NH₃‐SCR of NO_x

Acid Activation in Low-Carbon Binders: A Systematic Literature Review

Phosphate-activated geopolymers: advantages and application

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Valorization of sugar beet waste as a foaming agent for metakaolin geopolymer activated with phosphoric acid

Cited by 32 publications

References 77 publications

Manganese‐enhanced porous phosphoric acid–based geopolymer templated by carbon for efficient NH3‐SCR of NOx

Manganese‐enhanced porous phosphoric acid–based geopolymer templated by carbon for efficient NH3‐SCR of NOx

Acid Activation in Low-Carbon Binders: A Systematic Literature Review

Phosphate-activated geopolymers: advantages and application

Contact Info

Product

Resources

About

Manganese‐enhanced porous phosphoric acid–based geopolymer templated by carbon for efficient NH₃‐SCR of NO_x

Manganese‐enhanced porous phosphoric acid–based geopolymer templated by carbon for efficient NH₃‐SCR of NO_x