Synthesis and Characterization of Different Crystalline Calcium Silicate Hydrate: Application for the Removal of Aflatoxin B1 from Aqueous Solution

Zeng, Lu; Yang, Ligang; Wang, Shuping; Yang, Kai

doi:10.1155/2014/431925

Cited by 13 publications

(7 citation statements)

References 35 publications

(40 reference statements)

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“…With similar results, a lower MPSD was obtained for the PSO model except for PS4 P i 10, which presented an increase of (2.6%) with respect to PFO model for the same treatment. Similar results can be found in the literature, with PSO providing a better fit for experimental data regarding the sorption of P using similar materials, such as sorbulite [14], recycled crushed concrete [15], CAAC [5] and crystalline CSH or crystallized tobermorite [48]. As previously discussed, either adsorption and/or precipitation and formation of Ca-P-silicates can be involved in P removal.…”

Section: Kinetic Modelssupporting

confidence: 84%

Crushed Autoclaved Aerated Concrete (CAAC), a Potential Reactive Filter Medium for Enhancing Phosphorus Removal in Nature-Based Solutions—Preliminary Batch Studies

Castellar

Formosa

Chimenos

et al. 2019

Water

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Phosphorus (P) is a limited resource and can promote eutrophication of water streams and acidification of oceans when discharged. Crushed autoclaved aerated concrete (CAAC), a by-product from demolition, has shown great potential for recovering P. The potential of CAAC to be used in nature-based solutions as a P-reactive filter medium was evaluated by performing preliminary batch essays. Here, we evaluated the interactions and main effects of the initial concentration of P (Pi; 5, 10 or 20 mg L−1), particle size (PS; 4 or 5 mm) and contact time (CT; 60, 180, 360, 720 and 1440 min) upon the removal. We performed physical and chemical characterization to understand the removal processes. Data collected were fitted in adsorption kinetic models. The statistical analysis showed a significant interaction between CT and Pi, with the combination of its main effects stronger on P removal than each one separately. Intriguingly, we noticed that the higher the concentration of Pi, the faster and higher the removal of P. Contrary to expectations, PS 5 mm showed higher removal rates than PS 4 mm, indicating that besides adsorption, other unidentified chemical processes are in place. Further studies using columns/pilots with real wastewater are recommended for a future follow-up.

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Section: Kinetic Modelssupporting

confidence: 84%

Crushed Autoclaved Aerated Concrete (CAAC), a Potential Reactive Filter Medium for Enhancing Phosphorus Removal in Nature-Based Solutions—Preliminary Batch Studies

Castellar

Formosa

Chimenos

et al. 2019

Water

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“…Since the used binder mainly consisted of slag and this amorphous precursor is rich in calcium, it is therefore expected to mainly form a calcium aluminum silicate hydrate (C-A-S-H) gel in the matrix. Amorphous calcium silicate hydrates (A-C-S-H) mainly consists of disordered calcium silicate hydrate (C-S-H) gel and crystalline calcium silicate hydrates (C-C-S-H) gel, which consists of crystallized tobermorite [54]. Sealing the specimens could increase the chain length of the C-S-H gel and convert the unfavorable crystalline product α-calcium silicate hydrate (α-C 2 SH) to tobermorite.…”

Section: Compressive Strengthmentioning

confidence: 99%

Microstructural Analysis and Strength Development of One-Part Alkali-Activated Slag/Ceramic Binders Under Different Curing Regimes

Abdollahnejad

Luukkonen

Mastali

et al. 2019

Waste Biomass Valor

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Alkali-activated binders have shown great potential in the reuse of industrial waste materials and have therefore received significant attention. The use of one-part or a "just-add-water" alkali-activated binder aims to avoid the use of alkali-activator solutions which have traditionally been utilized in two-part systems. By using a solid activator, the disadvantages posed by hazardous liquid activators (such as the difficulties of using them on-site) can be minimized. Ceramic materials represent a considerable fraction of construction and demolition wastes, and originate not only from the building process, but also as tiles from industry and rejected bricks. Besides using these waste materials as road sub-base or construction backfill materials, they can also be employed as supplementary cementitious materials or even as raw material for alkali-activated binders. This paper presents the strength development and microstructural results obtained from examining different compositions under various curing conditions (sealing, ambient, and submerged in water). Two different ceramic wastes (with and without firing) were used as a partial replacement (5-10% by mass) of ground granulated blast-furnace slag. Specimens were then cured under three different curing regimes, including: (1) plastic-sealed, (2) unsealed at ambient conditions with an average temperature of 23 °C and 35% RH, and (3) submerged in water until the test date. Mechanical testing (compressive and flexural strengths) and microstructural analysis (SEM/EDX, XRD, MIP, heat of hydration, TGA, and DTA) were used to determine the effects of curing conditions. The results showed that ceramic waste content and type, as well as curing regimes, greatly affect the chemical reaction products, strength development, and structural stability. Keywords One-part alkali-activated binders • Ceramic wastes • Curing conditions • Mechanical properties Statement of Novelty This paper presents the effects of using three different curing conditions (sealed, ambient, and submerged in water) on strength development at early and final ages and the microscopic analysis of one-part alkali-activated slag/ceramic binders. Moreover, a comparative study is conducted on partial replacement of ground granulated blast-furnace slag by two different ceramic wastes as a binder type.

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“…However, the flakelike structure of tobermorite in Figure 2(b) was low and disordered compared with Figure 2(c) which presented a better crystalline tobermorite. In addition, a small amount of floccules are observed in the micrograph of NSCSH due to the residual C-S-H gels, which did not turn into tobermorite [37]. At the same time, the xonotlite crystals synthesized consist of tiny needle-like microfibers together with orbicular particles which was observed in Figure 2(d detected at the edge but not at the core upon reaction of CSHs with Ni 2+ , and Ni 2+ in the solution of hydrating system is capable of binding some hydroxides.…”

Section: Characterization Of Scsh and Nscshmentioning

confidence: 99%

Preparation and Characterization of Ni-Doped Calcium Silicate Hydrate Based on Steel Slag: Adsorption Capacity for Rhodamine B from Aqueous Solution

Zeng

Yang

2015

Journal of Chemistry

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Calcium silicate hydrate based on steel slag (SCSH) and Ni-doped SCSH (NSCSH) were synthesized under specific hydrothermal conditions at saturated vapor pressure and 185°C for 7 hours. The structure and morphology of SCSH and NSCSH were characterized by XRD, SEM, and N2adsorption/desorption. SCSH mainly consisted of amorphous calcium silicate hydrate gel (C-S-H gel) together with some flake-like tobermorite and NSCSH consisted of crystalline tobermorite and xonotlite. The addition of Ni(NO3)2had great influence on microstructure of the composites, and SCSH possesses a mesoporous structure with slit-shaped pores, but NSCSH has narrow distributions of pore size. Furthermore, NSCSH has a higher adsorption capacity for Rhodamine B (RhB) than SCSH with removal percentages of RhB of about 52.4% and 88.2%, respectively. In addition, the effects of NSCSH dosage and pH values on the adsorption of RhB were investigated. Adsorption isotherm parameters are obtained from both Langmuir and Freundlich analysis and showed a better fit to a Langmuir model. All results indicated that NSCSH has a great potential to be a safe, easily-made, and cost-effective material for the control of RhB contamination.

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Synthesis and Characterization of Different Crystalline Calcium Silicate Hydrate: Application for the Removal of Aflatoxin B1 from Aqueous Solution

Cited by 13 publications

References 35 publications

Crushed Autoclaved Aerated Concrete (CAAC), a Potential Reactive Filter Medium for Enhancing Phosphorus Removal in Nature-Based Solutions—Preliminary Batch Studies

Crushed Autoclaved Aerated Concrete (CAAC), a Potential Reactive Filter Medium for Enhancing Phosphorus Removal in Nature-Based Solutions—Preliminary Batch Studies

Microstructural Analysis and Strength Development of One-Part Alkali-Activated Slag/Ceramic Binders Under Different Curing Regimes

Preparation and Characterization of Ni-Doped Calcium Silicate Hydrate Based on Steel Slag: Adsorption Capacity for Rhodamine B from Aqueous Solution

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