Preparation and application of MgO-loaded tobermorite to simultaneously remove nitrogen and phosphorus from wastewater

Dai, Suwan; Wen, Qian; Huang, Feizhou; Bao, Yuqing; Xi, Xiaodong; Liao, Zhipeng; Shi, Jing; Ou, Changjin; Qin, Juan

doi:10.1016/j.cej.2022.136809

Cited by 24 publications

(8 citation statements)

References 53 publications

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“…As illustrated in Figure 4 a, when the tobermorite dosage increased from 2.5 to 10 g/L, the removal efficiency of Cd 2+ was increased from 94.34% to 99.71%. Increased tobermorite dosages could provide more active sites to promote Cd 2+ removal [ 34 ]. However, no significant improvement was observed after the dosage was increased from 10 to 15 g/L.…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Cd2+ Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution

et al. 2023

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Cadmium (Cd), as a type of heavy metal, can increase the incidence of many diseases, even in low concentrations. In this study, tobermorite was hydrothermally synthesized and then applied to adsorb Cd2+ from an aqueous solution. The physicochemical characteristics of the synthesized tobermorite were detected, and the results indicated that the well-crystallized tobermorite had a lot of mesopores and a large specific surface area of 140.92 m2/g. It acquired a pH self-adjustment ability via spontaneously releasing Ca2+ and OH- into the aqueous solution. The effects of different factors on Cd2+ removal were investigated. For Cd2+, the removal efficiency could reach 99.71% and the maximum adsorption capacity was 39.18 mg/g using tobermorite. The adsorption data was best fitted with the pseudo-second-order kinetic and Langmuir isotherm models. In addition, there was no strict limit on the solution pH in Cd2+ adsorption because the tobermorite could adjust the solution pH to an alkaline atmosphere spontaneously. The efficient removal of Cd2+ using tobermorite was a result of surface complexation and ion exchange.

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Section: Resultsmentioning

confidence: 99%

Highly Efficient Cd2+ Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution

et al. 2023

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“…The characterization of QWF and ESP, in this study, revealed that these waste materials contain the key components for tobermorite synthesis such as SiO 2 and CaO. Aside from construction applications, tobermorite has been gaining more attention in recent years due to its high utilization value in chemical and mechanical industries, its economy of materials, as well as its potential for environmental cleanup purposes [75,[78][79][80].…”

Section: Discussionmentioning

confidence: 86%

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

Saldia,

Bacosa,

Vegafria

et al. 2024

Sustainability

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Quarry waste fines and eggshells are unavoidable wastes which relentlessly contribute to environmental loads and pollution. Although many studies have suggested various methods for recycling, these wastes remain underutilized due to some technical constraints. In addition, no study has yet explored the possibility of combining quarry waste fines (QWF) and eggshell powder (ESP) for tobermorite synthesis. Tobermorite is the main component which primarily provides strength to autoclaved aerated concrete products. With this in mind, this study seeks to evaluate the potential of QWF-ESP mix at 10%, 15%, and 20% amounts of cement, respectively. The XRF, XRD, and TGA–DTA techniques were used to characterize the waste materials, while physical and mechanical property tests and XRD analysis were performed on the autoclaved samples. It was found that QWF contains 53.77% SiO2 and ESP contains 97.8% CaO which are key components for tobermorite synthesis. This study also revealed that the mixture with only 10% cement has the highest compressive strength among the QWF-ESP samples. Furthermore, the formation of tobermorite in the samples was confirmed through XRD analysis. Hence, the hydrothermal curing of QWF-ESP can be further developed to produce functional tobermorite-bearing materials.

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“…The characterization of QWF and ESP, in this study, revealed that these waste materials contain the key components for tobermorite synthesis such as SiO2 and CaO. Aside from construction applications, tobermorite has been gaining more attention in recent years due to its high utilization value in chemical and mechanical industries, its economy of materials, as well as its potential for environmental cleanup purposes [78,[81][82][83].…”

Section: Discussionmentioning

confidence: 86%

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

Saldia,

Bacosa,

Vegafria

et al. 2023

Preprint

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Quarry waste fines and eggshells are unavoidable wastes which relentlessly contribute to environmental load and pollution. Although a number of studies have suggested various methods for recycling, these wastes remain underutilized due to some technical constraints. In addition, no study has yet been explored on the possibility of combining quarry waste fines (QWF) and eggshell powder (ESP) for tobermorite synthesis. Tobermorite is the main component which primarily provides strength to the autoclaved aerated concrete products. For this purpose, this study seeks to evaluate the potential of QWF- ESP mix at 10%, 15% and 20% amounts of cement, respectively. The XRF, XRD, and TGA–DTA techniques were used to characterize the waste materials while physical and mechanical property tests and XRD analysis were performed on the autoclaved samples. It was found that QWF contains 53.77% SiO2, while ESP contains 97.8% CaO which are key components for tobermorite synthesis. This study also revealed that the mixture with only 10% cement has the highest compressive strength among the QWF-ESP samples. Furthermore, the formation of tobermorite in the samples was confirmed through XRD analysis. Hence, the hydrothermal curing of QWF –ESP can be further developed to produce functional tobermorite – bearing materials.

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Preparation and application of MgO-loaded tobermorite to simultaneously remove nitrogen and phosphorus from wastewater

Cited by 24 publications

References 53 publications

Highly Efficient Cd2+ Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution

Highly Efficient Cd2+ Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

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