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

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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An all-in-one strategy for the adsorption of heavy metal ions and photodegradation of organic pollutants using steel slag-derived calcium silicate hydrate

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2019.121120 ◽

2020 ◽

Vol 382 ◽

pp. 121120 ◽

Cited By ~ 8

Author(s):

Ningning Shao ◽

Shun Li ◽

Feng Yan ◽

Yiping Su ◽

Fei Liu ◽

...

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Organic Pollutants ◽

Calcium Silicate ◽

Heavy Metal Ions ◽

Calcium Silicate Hydrate ◽

Steel Slag

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Hierarchically Structured Calcium Silicate Hydrate-Based Nanocomposites Derived from Steel Slag for Highly Efficient Heavy Metal Removal from Wastewater

ACS Sustainable Chemistry & Engineering ◽

10.1021/acssuschemeng.8b03428 ◽

2018 ◽

Vol 6 (11) ◽

pp. 14926-14935 ◽

Cited By ~ 26

Author(s):

Ningning Shao ◽

Siqi Tang ◽

Ze Liu ◽

Li Li ◽

Feng Yan ◽

...

Keyword(s):

Heavy Metal ◽

Calcium Silicate ◽

Calcium Silicate Hydrate ◽

Metal Removal ◽

Heavy Metal Removal ◽

Steel Slag ◽

Highly Efficient

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Synthesis of Calcium Silicate Hydrate Compounds From Wet Flue Gas Desulfurization (FGD) Waste

Journal of Applied Materials and Technology ◽

10.31258/jamt.1.2.88-95 ◽

2020 ◽

Vol 1 (2) ◽

pp. 88-95

Author(s):

Denise Alves Fungaro ◽

Lucas Caetano Grosche ◽

Juliana de Carvalho Izidoro

Keyword(s):

Adsorption Capacity ◽

Flue Gas ◽

Calcium Silicate ◽

Calcium Silicate Hydrate ◽

Flue Gas Desulfurization ◽

Maximum Adsorption Capacity ◽

Fusion Temperature ◽

Hydrothermal Temperature ◽

X Ray ◽

Wide Range

In this study Calcium silicate hydrate based products (CSHP) were synthesized from wet flue gas desulfurization waste (FGD) by alkali fusion followed by hydrothermal treatment. The effect of various factors on the formation of products, such as mineralizing agent, fusion temperature and time, crystallization time and addition of Ca and Si were studied as well as the conditions optimized. The FGD and synthesized materials were characterized by using X-Ray (XRD), Scanning Electron Microscope (SEM), X-ray fluorescence (XFR), among other methods. A fusion temperature of 600 °C with NaOH, fusion duration of 1 h, and a subsequent hydrothermal temperature of 100 °C for a reaction of 24 h were found to be the optimal conditions. In these synthesis conditions, CSHP containing tobermorite and Al-tobermorite was the major phases. The synthesized CSHP revealed high selective uptake for Cs+ in water. The maximum adsorption capacity of Cs+ onto the synthesized material, as calculated from the Langmuir model, was 1949 µmol g-1. The performance on the Cs+ removal in the presence of high Na+ contents was also evaluated. The adsorbent material showed a high Cs+ adsorption capacity in deionized water and a decrease of 56% and 62% in saturated media with the Na+ ions and seawater, respectively. Therefore, CSHP as a higher value-added product can be obtained from a by-product of a coal-fired power plant, which has wide range applications, including for Cs+ removal from wastewater.

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Influence of foreign ions on calcium silicate hydrate under hydrothermal conditions: A review

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.124071 ◽

2021 ◽

Vol 301 ◽

pp. 124071

Author(s):

Hongwei Tian ◽

Dietmar Stephan ◽

Barbara Lothenbach ◽

Christian Lehmann

Keyword(s):

Calcium Silicate ◽

Calcium Silicate Hydrate ◽

Hydrothermal Conditions ◽

Foreign Ions

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Synthesis of calcium silicate hydrate based on steel slag with various alkalinities

Journal of Wuhan University of Technology-Mater Sci Ed ◽

10.1007/s11595-014-0998-0 ◽

2014 ◽

Vol 29 (4) ◽

pp. 789-794 ◽

Cited By ~ 6

Author(s):

Shuping Wang ◽

Xiaoqin Peng ◽

Jianqiang Geng ◽

Bin Li ◽

Kaiyu Wang

Keyword(s):

Calcium Silicate ◽

Calcium Silicate Hydrate ◽

Steel Slag

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

Journal of Nanomaterials ◽

10.1155/2014/431925 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 7

Author(s):

Lu Zeng ◽

Ligang Yang ◽

Shuping Wang ◽

Kai Yang

Keyword(s):

Adsorption Kinetics ◽

Aflatoxin B1 ◽

Calcium Silicate ◽

Calcium Silicate Hydrate ◽

Intraparticle Diffusion ◽

Second Order ◽

Order Kinetic ◽

Hydrothermal Conditions ◽

Calcium Silicate Hydrates ◽

Pseudo Second Order

Different crystalline calcium silicate hydrates (CSH) were synthesized under specific hydrothermal conditions and several methods were used to analyze samples. Amorphous calcium silicate hydrates (ACSH) mainly consists of disordered calcium silicate hydrate gel (C-S-H gel) and crystalline calcium silicate hydrates (CCSH) consists of crystallized tobermorite. The adsorption of carcinogenic aflatoxin B1 (AFB1) onto ACSH and CCSH was investigated. The adsorption kinetics was studied using pseudo-first-order and pseudo-second-order kinetic models and intraparticle diffusion model. The pseudo-second-order model provided the best correlation and the intraparticle diffusion controlled the adsorption process of AFB1 onto CCSH. Adsorption isotherm parameters were obtained from Langmuir and Freundlich and the adsorption data fitted to Freundlich much better. Based on the results of N2adsorption/desorption, adsorption kinetics, and adsorption isotherms, the adsorption mechanism of AFB1 onto CCSH was developed. All results indicate that CCSH has a great potential to be a safe, easy-made, and cost-effective material for the control of AFB1 contamination.

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