Immobilization of strontium in geopolymers activated by different concentrations of sodium silicate solutions

Tian, Quanzhi; Pan, Yinhai; Bai, Yingchu; Sasaki, Keiko

doi:10.1007/s11356-021-17553-9

Cited by 9 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Physio-chemical processes such as precipitation, liquid-liquid extraction, ion exchange, and adsorption have been used for the treatment of waste solutions [3][4][5][6]. Among types of methods, using solidstate adsorbents such as silicotitanates, metal sulfide, geopolymers, and zeolites have shown degrees of successful cost-effectiveness and selective removal of Sr in aqueous [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Carboxyl Functionalized UiO-66-(COOH)2 for Selective Adsorption of Sr2+

et al. 2022

Self Cite

View full text Add to dashboard Cite

Efficient and selective removal of 90Sr is an important process for the safe use of nuclear energy. Herein, we investigate and assess the Sr2+ adsorption properties of a metal-organic framework UiO-66-(COOH)2 functionalized by non-bonded carboxylic groups. This MOF is an exciting class of free carboxylic functionalized MOFs that combine chemical stability with gas sorption, dye elimination, and conductivity. Specifically, we show that uniformly distributed carboxyl and water stability make it accessible for loading Sr2+ without structural changes. The FTIR spectroscopy, PXRD analysis, XPS, and SEM-EDS studies show excellent stability as well as the strong affinity between -COOH active site and Sr2+. This strong coordination interaction guarantees a high adsorption capacity of 114 mg g−1 within 5 h (pH 5 and 298 K). Combined kinetic and thermodynamic studies show that the surface complexation is strong chemisorption and cost-effective spontaneous process (ΔG = −5.49 kJ mol−1~−2.16 kJ mol−1). The fact that UiO-66-(COOH)2 not only possesses a high adsorption capacity, but also enables selectivity to Sr2+ in the presence of similar radius ions Na+ and K+, prefigures its great potential for the practical treatment of radioactive Sr2+ in polluted water.

show abstract

Section: Introductionmentioning

confidence: 99%

The Carboxyl Functionalized UiO-66-(COOH)2 for Selective Adsorption of Sr2+

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…With the increase of CaO content, the content of Si–Al (mainly SiO 2 and Al 2 O 3 ) in the system was also increasing. According to the research of Tian et al , 23 the unit structure of geopolymer could be divided into PSDS type (–Si–O–Al–O–Si–O–Si–O–), PSS type (–Si–O–Al–O–Si–O–) and PS type (–Si–O–Al–O–), of which PSS type was the long chain structure of Si and Al was the strongest chain type. CaO, SiO 2 and Al 2 O 3 in the raw materials reacted to form C–S–H and C–(A)–S–H gel structures under the condition of alkali activation, which were attached to the three-dimensional structure of zeolites generated by the previous polymerization reaction, which was equivalent to filling the gaps and making the structure more compact, thus improving the UCS.…”

Section: Resultsmentioning

confidence: 99%

“…With the increase of CaO content, the content of Si-Al (mainly SiO 2 and Al 2 O 3 ) in the system was also increasing. According to the research of Tian et al, 23 generated by the previous polymerization reaction, which was equivalent to lling the gaps and making the structure more compact, thus improving the UCS. 24 When CaO content was 34.5% the 28 d-UCS was dropped to 18.4 MPa.…”

Section: Effect Of Oxide Contents On the Ucs Of Geopolymermentioning

confidence: 99%

Resistance and durability of fly ash based geopolymer for heavy metal immobilization: properties and mechanism

Ren,

Wang,

et al. 2024

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…These materials can be considered precursors to zeolites with different affinities toward various ions. Notably, the Si/Al ratio is the controlling factor affecting the adsorption ability of geopolymers [13][14][15][16]. In the field of radioactive waste immobilization, geopolymers that outperform Portland cement can be prepared by changing the precursor materials and activators [15].…”

Section: Introductionmentioning

confidence: 99%

“…Notably, the Si/Al ratio is the controlling factor affecting the adsorption ability of geopolymers [13][14][15][16]. In the field of radioactive waste immobilization, geopolymers that outperform Portland cement can be prepared by changing the precursor materials and activators [15]. The absorbed waste elements can be further converted into stable ceramic-phase components, thereby increasing the difficulty of ion leaching by strengthening chemical bonds.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Density Functional Theory Studies of Aluminosilicate-Based Ceramic Solidified Products for Sr Immobilization

Wu,

Sang,

Zheng

et al. 2023

Toxics

View full text Add to dashboard Cite

Strontium is a common radionuclide in radioactive waste, and its release into the environment can cause enormous damage to the ecosystem environment. In this study, the natural mineral allophane was selected as the substrate to prepare solidified ceramic products by cold pressing/sintering to solve the problem of the final disposal of radioactive strontium. Ceramic solidified products with various crystal structures were successfully prepared, and the microscopic morphology and energy-dispersive spectroscopy images of the samples showed a uniform distribution of Sr in the solidified products. Sr2Al2SiO7 and SrAl2Si2O8, which can stably solidify strontium, were formed in the solidified products, and the structural characteristics and stability of the above-mentioned substances were analyzed from the perspective of quantum chemical calculations using density functional theory. The calculation results showed that the overall deformation resistance of Sr2Al2SiO7 was higher than that of SrAl2Si2O8. Considering the isomorphic substitution effect of CaO impurities, we inferred that a mixed-crystalline structure of Ca2−xSrxAl2SiO7 may be present in the solidified products.

show abstract

Immobilization of strontium in geopolymers activated by different concentrations of sodium silicate solutions

Cited by 9 publications

References 29 publications

The Carboxyl Functionalized UiO-66-(COOH)2 for Selective Adsorption of Sr2+

The Carboxyl Functionalized UiO-66-(COOH)2 for Selective Adsorption of Sr2+

Resistance and durability of fly ash based geopolymer for heavy metal immobilization: properties and mechanism

Preparation and Density Functional Theory Studies of Aluminosilicate-Based Ceramic Solidified Products for Sr Immobilization

Contact Info

Product

Resources

About