Synthesis of zeolite from steel slag and its application as a support of nano-sized TiO2 photocatalyst

Kuwahara, Yasutaka; Ohmichi, Tetsutaro; Mori, Kohsuke; Katayama, Iwao; Yamashita, Hiromi

doi:10.1007/s10853-007-2073-0

Cited by 49 publications

(19 citation statements)

References 12 publications

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“…To date, several studies have reported on the benefits of modification and/or activation treatment to increase the specific surface area and density of adsorption sites on the surfaces of the adsorbent particles [42,57,[59][60][61][62][63][64][65][66]. Other studies have also proposed the synthesis of functionalised adsorbents such as geopolymers [74,[118][119][120][121][122][123], permeable reactive barriers or slag filters [124][125][126][127][128][129][130][131][132], zeolites and zeolite precursors [133][134][135] and layered double-hydroxide-based adsorbents [133][134][135][136][137][138]. This section discusses in detail the opportunities to improve the adsorption capacity of slag-based adsorbents.…”

Section: Opportunities To Enhance the Adsorption Performance Of Slagsmentioning

confidence: 99%

“…Thus, the high silica, aluminosilicate and calcium-aluminosilicate content of ironmaking and steelmaking slags makes them ideal precursors for the synthesis of zeolites and their variants. To date, several studies have explored the synthesis of zeolites using ironmaking and steelmaking slags as precursors [133][134][135]. In particular, Sugano et al [133] However, the adsorption capacity for Cu 2+ ions by NaA synthesised at 120 • C was significantly higher (1.346 mmol g −1 ) than that of sodalite synthesised at 140 • C (0.722 mmol g −1 ) and 160 • C (0.673 mmol g −1 ).…”

Section: Synthesis Of Zeolites From Slagsmentioning

confidence: 99%

“…In particular, Sugano et al [133] However, the adsorption capacity for Cu 2+ ions by NaA synthesised at 120 • C was significantly higher (1.346 mmol g −1 ) than that of sodalite synthesised at 140 • C (0.722 mmol g −1 ) and 160 • C (0.673 mmol g −1 ). In an earlier study, Kuwahara et al [134] also synthesized FAU-type zeolites (Type X, Type Y) using a two-step hydrothermal treatment of Ti-bearing steelmaking slag. The FAU-type zeolite was applied as a support for the TiO 2 photocatalyst for the degradation of organic pollutants.…”

Section: Synthesis Of Zeolites From Slagsmentioning

confidence: 99%

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Ironmaking and Steelmaking Slags as Sustainable Adsorbents for Industrial Effluents and Wastewater Treatment: A Critical Review of Properties, Performance, Challenges and Opportunities

et al. 2020

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This paper critically discusses the structure, properties and applications of ironmaking and steelmaking slags and their silicate-based variants as low-cost adsorbents for removing cations and anions from industrial effluents and wastewater. Undoubtedly, the performance of slag-based adsorbents depends on their physical, chemical and phase chemical properties. The presence of crystalline phases, for example, has a significant effect on the adsorption capacity. However, despite their low cost and ubiquity, their chemical and geometric heterogeneity significantly affects the performance and applications of slag-based adsorbents. These challenges notwithstanding, the efficacy of slag-based adsorbents can be significantly enhanced through purposeful activation to increase the specific surface area and density of adsorption sites on the surfaces of adsorbent particles. The synthesis of functionalised adsorbents such as geopolymers, zeolites and layered double hydroxides from silicate and aluminosilicate precursors can also significantly increase the performance of slag-based adsorbents. In addition, the ability to stabilise the dissolved and/or entrained toxic metal species in stable phases in slags, either through controlled post-process fluxing or crystallisation, can significantly enhance the environmental performance of slag-based adsorbents. Most critical in the design of future slag-based adsorbents is the integration of the engineered properties of molten and solidified slags to the recovery and stabilisation of dissolved and/or entrained metals.

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Section: Opportunities To Enhance the Adsorption Performance Of Slagsmentioning

confidence: 99%

Section: Synthesis Of Zeolites From Slagsmentioning

confidence: 99%

Section: Synthesis Of Zeolites From Slagsmentioning

confidence: 99%

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Ironmaking and Steelmaking Slags as Sustainable Adsorbents for Industrial Effluents and Wastewater Treatment: A Critical Review of Properties, Performance, Challenges and Opportunities

et al. 2020

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“…The other is the external recycling of it as building materials, agricultural fertilizer, functional materials, etc. [1][2][3][4][5][6]. The internal recycling of steel slag is considered to be the best method because calcium, magnesium, manganese, vanadium, iron, rare elements, etc., in the slag can be recovered, and a large portion of slagging agents, such as limestone and fluorite, can be saved [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Growth, Stratification, and Liberation of Phosphorus-Rich C2S in Modified BOF Steel Slag

Rao

Dong

Gui³

et al. 2020

Materials

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Basic oxygen furnace (BOF) slag was modified by adding 3.5% SiO2 and holding at 1673 K for 0, 5, 40, 90, 240, or 360 min. Kilo-scale modification was also carried out. The growth, stratification, and liberation of P-rich C2S in the modified slag were investigated. The optimum holding time was 240 min, and 90% of C2S grains were above 30 μm in size. The phosphorus content increased with holding time, and after modification, the phosphorus content in C2S was nearly three times higher than that in the original slag (2.23%). Obvious stratification of C2S was observed in the kilo-scale modification. Upper C2S particles with a relatively larger size of 20–110 μm was independent of RO (FeO-MgO-MnO solid solution) and spinel, which is favorable for liberation. Lower C2S was less than 3 μm and was embedded in spinel, which is not conducive to liberation. The content of phosphorus in upper C2S (6.60%) was about twice that of the lower (3.80%). After grinding, most of the upper C2S existed as free particles and as locked particles in the lower. The liberation degree of C2S in the upper increased with grinding time, from 86.02% to 95.92% in the range of 30–300 s, and the optimum grinding time was 180 s. For the lower slag grinding for 300 s, the liberation degree of C2S was 40.07%.

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“…Additionally, it was demonstrated that TiO 2 supported on zeolite is an efficient photocatalyst for decomposition of the organic dyes . Kuwahara et al .…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Efficiency of Zeolite‐Based TiO₂ Composites for Reduction of Cu (II): Kinetic Models

Peter

Mihaly‐Cozmuta

et al. 2013

Int J Applied Ceramic Tech

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This study evaluates the photoactivity of novel zeolite‐based TiO2 composites modified with metal particles for the photoreduction of Cu2+, depending on the zeolite and metal particles (Ag or Fe) content and to establish the photoreduction mechanism. The composites have been prepared by incorporating zeolite particles in the sols during the sol‐gel preparation of the TiO2, followed by impregnation of the gels in solutions containing metal ions. The zeolite‐based TiO2 composites have been characterized using X‐ray diffraction, Raman and FTIR spectroscopy techniques and TEM microscopy. The role of zeolite particles in the photoreduction process was demonstrated by using different kinetic models. The apparent constant rate for photoreduction increases in direct proportion with the content of zeolite and is higher for the composites modified with Fe than for those modified with Ag nanoparticles. The results demonstrate that composites have a higher photocatalytic efficiency than TiO2. The experiments in this study reveal that the migration of Cu2+ in solution occurs rapidly and that the diffusion through the film on the composite's surface and, subsequently, the photoreduction process are the rate limiting steps. The role of the zeolite in photoreduction is to diminish the recombination rate of the charge carriers.

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Synthesis of zeolite from steel slag and its application as a support of nano-sized TiO2 photocatalyst

Cited by 49 publications

References 12 publications

Ironmaking and Steelmaking Slags as Sustainable Adsorbents for Industrial Effluents and Wastewater Treatment: A Critical Review of Properties, Performance, Challenges and Opportunities

Ironmaking and Steelmaking Slags as Sustainable Adsorbents for Industrial Effluents and Wastewater Treatment: A Critical Review of Properties, Performance, Challenges and Opportunities

Growth, Stratification, and Liberation of Phosphorus-Rich C2S in Modified BOF Steel Slag

Photocatalytic Efficiency of Zeolite‐Based TiO₂ Composites for Reduction of Cu (II): Kinetic Models

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Synthesis of zeolite from steel slag and its application as a support of nano-sized TiO2 photocatalyst

Cited by 49 publications

References 12 publications

Ironmaking and Steelmaking Slags as Sustainable Adsorbents for Industrial Effluents and Wastewater Treatment: A Critical Review of Properties, Performance, Challenges and Opportunities

Ironmaking and Steelmaking Slags as Sustainable Adsorbents for Industrial Effluents and Wastewater Treatment: A Critical Review of Properties, Performance, Challenges and Opportunities

Growth, Stratification, and Liberation of Phosphorus-Rich C2S in Modified BOF Steel Slag

Photocatalytic Efficiency of Zeolite‐Based TiO2 Composites for Reduction of Cu (II): Kinetic Models

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Photocatalytic Efficiency of Zeolite‐Based TiO₂ Composites for Reduction of Cu (II): Kinetic Models