Solidification and Stabilization of Spent TBP/OK Organic Liquids in a Phosphate Acid-Based Geopolymer

Dong, Teng Yuan; Xie, Shuibo; Wang, Jingsong; Zhao, Guodong; Song, Qiong

doi:10.1155/2020/8094205

Cited by 13 publications

(7 citation statements)

References 7 publications

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“…Cationic 31) and non-ionic 32) surfactants have proven their effectiveness for the incorporation of OL in geopolymers. Surfactants reduce the size of dispersed droplets by decreasing the interfacial tension, which slows down the droplet movements and stabilizes the emulsion.…”

Section: Methodsmentioning

confidence: 99%

Oil and Organic Liquids Incorporation into Fresh Geopolymer Pastes Using Suitable Quaternary Ammonium Surfactants

Pierlot,

Boland,

et al. 2024

J. Oleo Sci.

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ance of chemical stabilization of many compounds and produces a mechanically stable form of waste. Unfortunately, the stabilization of organic liquids (OL) in Ordinary Portland Cement (OPC) greatly retards and disrupts cement setting, and organic liquids generally form weak chemical bonds in cement unlike some inorganics 5,6) . Due to these disadvantages, geopolymers could be a solution to replace OPC for the incorporation of organic liquids and also for the treatment of OL waste.Since the resulting paste hardens to form a solid material (hardened GP) , mixing organic liquids (OL) with such aqueous suspensions 1, 2, 7, 8) has been recently described for the synthesis of porosity-controlled media, thermal insulating foams or filtration supports 9−13) and for the treatment of radioactive wastes 14,15) .In order to understand the immobilization of radioactive organic liquid wastes, alkanes 14,16) and paraffin oils 17) are used as model oils. The one-step incorporation process, which seems industrially more reasonable than the two-Abstract: The direct incorporation of low viscosity organic liquids (OL) such as dodecane and tributylphosphate (TBP) into fresh geopolymers (GP) is difficult and generally leads to variable amounts of un-incorporated OL remaining outside the hardened geopolymer. Experimentally, it is observed that a regular torque increase during OL incorporation corresponds to a suitable dispersion of the OL in the form of fine micrometric droplets. This can be obtained for TBP and dodecane by adding a small quantity of quaternary ammoniums salts (QAs) such as cetyltrimethylammonium bromide (CTAB). Shorter alkyl chains QAs, such as hexamethyltrimethylammonium (HMTA) can also be used but with a reduced efficiency. The positive impact of CTAB is then confirmed by the Washburn capillary rise method, showing that the interactions between TBP and CTAB-modified metakaolin are weaker compared to untreated powder. Finally, it is observed that the incorporation of TBP into geopolymer slurries is much easier than the incorporation of dodecane. The low interfacial tension measured between TBP and the activating solution (around 8 mN•m -1 ), contrasting with dodecane (29 mN•m -1 ), explains that the dispersion of TBP droplets in fresh metakaolin suspensions is more efficient.

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Section: Methodsmentioning

confidence: 99%

Oil and Organic Liquids Incorporation into Fresh Geopolymer Pastes Using Suitable Quaternary Ammonium Surfactants

Pierlot,

Boland,

et al. 2024

J. Oleo Sci.

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“…Adsorption is pH-dependent, which means that electrostatic interactions are the main driving mechanism of adsorption [ 52 ]. In addition, the attempt to cure tributyl radioactive phosphate (TBP, a waste organic solvent containing a variety of radionuclides such as uranium and plutonium) with ASP geopolymers has also demonstrated its good curing efficiency for radioactive nuclear waste [ 91 ].…”

Section: Applied Research On Asp Geopolymersmentioning

confidence: 99%

Comprehensive Understanding of Aluminosilicate Phosphate Geopolymers: A Critical Review

Zhang

Liu

2022

Materials

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Aluminosilicate phosphate (ASP) geopolymers are a new kind of green cementitious materials synthesized from aluminosilicate precursors and acidic activators (phosphoric acid or phosphate), which have received extensive attention from researchers because of their excellent and unique characteristics. The current investigation indicates that ASP geopolymers have the characteristics of a low-carbon synthesis process, high mechanical properties (e.g., the highest compressive strength can reach 146 MPa), a strong heat resistance (e.g., withstanding a high temperature of 1500 °C), and excellent dielectric properties. These excellent properties make them have broad application prospects in the fields of new building materials, coating materials, insulating materials, and heavy metal curing. Based on the research findings of approximately 85 relevant literatures on ASP geopolymers in past decades, this paper focuses on the latest research progress of ASP geopolymers from the perspectives of synthesis processes, performances, modifications, and application developments. In addition, this study summarizes the key problems existing in the current research of ASP geopolymers and suggests their possible applications in the future, which will help to provide directions for further research activities of relevant researchers.

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“…TBP is often used as an extractant for the recovery of U, Pu, and other fission products and then discarded as a hazardous waste organic solvent after a decrease in the extraction performance . Physical encapsulation, heterogeneous Fenton-like processes, and incineration technology have been used to treat waste TBP solvent. However, most of these technologies have limitations, such as complicated treatment processes, generation of secondary wastes, corrosion of equipment, etc.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Organophosphorus Esters Waste by CeO₂: Efficient Degradation with Simultaneous Phosphorus Immobilization

Wang,

Zheng,

Tong

et al. 2023

Ind. Eng. Chem. Res.

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Organophosphorus esters (OPEs) are important chemicals functioning as extractants, plasticizers, flame retardants, solvents, additives, etc., and are also recognized as hazardous organic liquids generated from industrial processes. Herein, we developed a CeO2-catalyzed degradation with simultaneous phosphorus immobilization technology to treat typical OPE solvents. Under the investigated reaction conditions of a temperature of 180 °C, a reaction time of 3 h, and a dosage of ball-milled CeO2 of 19.8 g mL–1 of the OPE, the model pollutant of tributyl phosphate (TBP) was efficiently degraded with phosphorus immobilization efficiency near 100%. Meanwhile, the mineralization efficiency of TBP was also as high as 98%, which was reflected by the chemical oxygen demand change of liquid products. Gaseous products generated from CeO2-catalyzed TBP degradation could also fulfill the requirements of an environmental standard. Further mechanism studies indicated that the surface oxygen vacancy in CeO2 induced the in situ formation of superoxide radicals, which dominated TBP degradation. During catalytic degradation, the P-containing species were mainly immobilized as cerium phosphate, while the hydrocarbon chains of TBP were degraded into small molecules and finally mineralized into inorganic species. The developed CeO2-catalyzed OPE degradation approach was also applicable to aromatic and halogenated OPEs, i.e., tricresyl phosphate and tris(2-chloroethyl) phosphate. This study provided a possible alternative for waste treatment of the waste of OPEs with low environmental risks.

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Solidification and Stabilization of Spent TBP/OK Organic Liquids in a Phosphate Acid-Based Geopolymer

Cited by 13 publications

References 7 publications

Oil and Organic Liquids Incorporation into Fresh Geopolymer Pastes Using Suitable Quaternary Ammonium Surfactants

Oil and Organic Liquids Incorporation into Fresh Geopolymer Pastes Using Suitable Quaternary Ammonium Surfactants

Comprehensive Understanding of Aluminosilicate Phosphate Geopolymers: A Critical Review

Treatment of Organophosphorus Esters Waste by CeO₂: Efficient Degradation with Simultaneous Phosphorus Immobilization

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Solidification and Stabilization of Spent TBP/OK Organic Liquids in a Phosphate Acid-Based Geopolymer

Cited by 13 publications

References 7 publications

Oil and Organic Liquids Incorporation into Fresh Geopolymer Pastes Using Suitable Quaternary Ammonium Surfactants

Oil and Organic Liquids Incorporation into Fresh Geopolymer Pastes Using Suitable Quaternary Ammonium Surfactants

Comprehensive Understanding of Aluminosilicate Phosphate Geopolymers: A Critical Review

Treatment of Organophosphorus Esters Waste by CeO2: Efficient Degradation with Simultaneous Phosphorus Immobilization

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Treatment of Organophosphorus Esters Waste by CeO₂: Efficient Degradation with Simultaneous Phosphorus Immobilization