Synthesis of Calcium Silicate Hydrate from PV waste glass and carbide waste sludge in Water and NaOH medium toward the Cr(III) removal in waste water

Tran Ngo  Quan; Pham Trung  Kien

doi:10.6180/jase.202605_29(5).0005

Synthesis of Calcium Silicate Hydrate from PV waste glass and carbide waste sludge in Water and NaOH medium toward the Cr(III) removal in waste water

Tran Ngo Quan^1,2 and Pham Trung Kien^1,2,3,4This email address is being protected from spambots. You need JavaScript enabled to view it.

¹Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, HCMC, Vietnam

²Vietnam National University Ho Chi Minh City, Linh Trung Ward, , HCMC, Vietnam

³Polymer Research Center, HCMUT, 268 Ly Thuong Kiet Street, HCMC, Vietnam

⁴VNU-HCM Key Laboratorty for Medical Technologies, HCMUT, HCMC, Vietnam

Received: May 22, 2025
Accepted: August 31, 2025
Publication Date: August 30, 2025

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202605_29(5).0005

Calcium Silicate Hydrate (CSH) is a crucial material with diverse applications in construction, interior/exterior decoration, and high-tech industries due to its unique mechanical and physical properties. This study explores synthesizing CSH from recycled waste, specifically using photovoltaic (PV) waste glass as a silicon source and carbide sludge as a calcium source. This approach promotes industrial waste treatment, environmental protection, and a circular economy. We synthesized CSH under various hydrothermal conditions (NaOH and H2O at 180^◦C for 96hours) and analyzed the resulting materials using XRD, FT-IR, and SEM to identify phase compositions and characteristic structures. Furthermore, we tested the CSH samples for chromium adsorption by immersing them in simulated Cr (III) wastewater and analyzing them with UV-Vis spectroscopy. The synthesized materials exhibited crystal structures similar to Xonotlite and Tobermorite minerals, achieving an impressive Cr(III) adsorption efficiency of up to 98.9%. This research highlights the potential of using waste materials to synthesize CSH via a hydrothermal method and demonstrates its effectiveness in removing Cr(III) from wastewater, suggesting further investigation into its adsorption capacity for other heavy metals.

Keywords: Calcium Silicate Hydrate, C-S-H, PV waste glass, carbide sludge, Cr( III ) adsorption.

[1] A. Baldermann, A. Landler, F. Mittermayr, I. Letofsky-Papst, F. Steindl, I. Galan, and M. Dietzel, (2019) “Removal of heavy metals (Co, Cr, and Zn) dur ing calcium–aluminium–silicate–hydrate and trioctahedral smectite formation" Journal of Materials Science 54(13): 9331–9351.
[2] M. A. Bhuiyan, M. Islam, S. B. Dampare, L. Parvez, and S. Suzuki, (2010) “Evaluation of hazardous metal pollution in irrigation and drinking water systems in the vicinity of a coal mine area of northwestern Bangladesh" Journal of hazardous materials 179(1-3): 1065–1077.
[3] A. E. Burakov, E. V. Galunin, I. V. Burakova, A. E. Kucherova, S. Agarwal, A. G. Tkachev, and V. K. Gupta, (2018) “Adsorption of heavy metals on conventional and nanostructured materials for wastewater treat ment purposes: A review" Ecotoxicology and environ mental safety 148: 702–712.
[4] L. Liu, S. Liu, H. Peng, Z. Yang, L. Zhao, and A. Tang, (2020) “Surface charge of mesoporous calcium silicate and its adsorption characteristics for heavy metal ions" Solid State Sciences 99: 106072.
[5] J. A. Tsanakas, L. Ha, and C. Buerhop, (2016) “Faults and infrared thermographic diagnosis in operating c-Si photovoltaic modules: A review of research and future challenges" Renewable and sustainable energy reviews 62: 695–709.
[6] C. Ballif, J. Dicker, D. Borchert, and T. Hofmann, (2004) “Solar glass with industrial porous SiO2 antireflection coating: measurements of photovoltaic module properties improvement and modelling of yearly energy yield gain" Solar energy materials and solar cells 82(3): 331–344.
[7] P. Ramasamy, A. Periathamby, and S. Ibrahim, (2002) “Carbide sludge management in acetylene producing plants by using vacuum filtration" Waste management & re search 20(6): 536–540.
[8] Z. Zhao, J. Wei, F. Li, X. Qu, L. Shi, H. Zhang, and Q. Yu, (2017) “Synthesis, characterization and hexavalent chromium adsorption characteristics of aluminum-and sucrose-incorporated tobermorite" Materials 10(6): 597.
[9] C. Hejny and T. Armbruster, (2001) “Polytypism in xonotlite Ca6Si6O17 (OH) 2" Zeitschrift für Kristallographie-Crystalline Materials 216(7): 396–408.
[10] P. Yu, R. J. Kirkpatrick, B. Poe, P. F. McMillan, and X. Cong, (1999) “Structure of calcium silicate hydrate (C-S H): Near-, Mid-, and Far-infrared spectroscopy" Journal of the American Ceramic Society 82(3): 742–748.
[11] S. Steiner, B. Lothenbach, T. Proske, A. Borgschulte, and F. Winnefeld, (2020) “Effect of relative humidity on the carbonation rate of portlandite, calcium silicate hy drates and ettringite" Cement and Concrete Research 135: 106116.
[12] M.Diez-Garcia, J. J. Gaitero, J. I. Santos, J. S. Dolado, and C. Aymonier, (2018) “Supercritical hydrothermal f low synthesis of xonotlite nanofibers" Journal of Flow Chemistry 8(2): 89–95.
[13] Y. He, X. Zhao, L. Lu, L. J. Struble, and S. Hu, (2011) “Effect of C/S ratio on morphology and structure of hydrothermally synthesized calcium silicate hydrate" Journal of Wuhan University of Technology-Mater. Sci. Ed. 26(4): 770–773.
[14] D. Luo, M. Xie, and X. Zhou. “Microwave assisted rapid synthesis of glycerol carbonate from glycerol catalyzed by anhydrous sodium silicate”. In: IOP Conference Series: Earth and Environmental Science. 687. 1. IOP Publishing. 2021, 012077.
[15] N. D. Van, K. Imasawa, and Y. Hama, (2022) “Influence of hydrothermal synthesis conditions and carbonation on physical properties of xonotlite-based lightweight material" Construction and Building Materials 321: 126328.
[16] L. Black, K. Garbev, and A. Stumm, (2009) “Structure, bonding and morphology of hydrothermally synthesised xonotlite" Advances in Applied Ceramics 108(3): 137–144.
[17] Y. Li, W. Liu, F. Xing, S. Wang, L. Tang, S. Lin, and Z. Dong, (2020) “Carbonation of the synthetic calcium silicate hydrate (CSH) under different concentrations of CO2: Chemical phases analysis and kinetics" Journal of CO2Utilization 35: 303–313.
[18] G. Zhu, H. Li, X. Wang, S. Li, X. Hou, W. Wu, and Q. Tang, (2016) “Synthesis of calcium silicate hydrate in highly alkaline system" Journal of the American Ceramic Society 99(8): 2778–2785.
[19] Y. Yan, S.-Y. Yang, G. D. Miron, I. E. Collings, E. L’Hôpital, J. Skibsted, F. Winnefeld, K. Scrivener, and B. Lothenbach, (2022) “Effect of alkali hydroxide on calcium silicate hydrate (CSH)" Cement and Concrete Research 151: 106636.
[20] C. Madi, M. Tabbal, T. Christidis, S. Isber, B. Nsouli, and K. Zahraman. “Microstructural characterization of chromium oxide thin films grown by remote plasma assisted pulsed laser deposition”. In: Journal of Physics: Conference Series. 59. 1. IOP Publishing. 2007, 600.
[21] N. Annuar, S. Triwahyono, A. Jalil, N. Basar, T. Abdullah, and A. Ahmad, (2017) “Effect of Cr2O3 loading on the properties and cracking activity of Pt/Cr2O3 ZrO2" Applied Catalysis A: General 541: 77–86.
[22] T. M. Al-Saadi and N. A. Hameed, (2015) “Synthesis and structural characterization of Cr2O3 nanoparticles prepared by using Cr (NO3)3.9H2Oandtriethanolamine undermicrowaveirr adiation" Synthesis 44:
[23] E. Gevorkyan, L. Cepova, M. Rucki, V. Nerubatskyi, D. Morozow, W. Zurowski, V. Barsamyan, and K. Kouril, (2022) “Activated sintering of Cr2O3-based com posites by hot pressing" Materials 15(17): 5960.