Preparation of Hydrated Calcium Silicate Gel and its Adsorption Properties for Cu(II)

Abstract:

Calcium silicate hydrate gel (CSH) was synthesized by calcium acetate and sodium silicate. The structure and morphology of CSH were characterized by X-ray diffraction analysis, Fourier transform infrared spectroscopy and Scanning electron microscopy. The adsorption performance of CSH was measured by static adsorption method. The results show that CSH has porous structure and large specific surface area, and the optimum reaction conditions is the reaction temperature of 25°C and calcium-silicon ratio of 1.2. It has the maximum adsorption capacity of more than 150 mg/g and the removal rate of more than 86% with Cu²⁺. And it shows the excellent adsorption performance, even when the concentration of Cu²⁺ is less than 200mg/L, the removal rate is above 90%. The research may provide a low-cost and high-efficiency adsorbent.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 1445-1449
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.1445
• Online since: May 2020
• Authors: Shi Jie Liu, Su Ping Cui*, Hong Xia Guo, Ya Li Wang, Nan Li, Yan Ling Gan, Yan Zheng
• Keywords: Adsorption Properties, Calcium Silicate Hydrate, Cu²⁺, Preparation

References

[1] Wang J, Ding L, Wei J, et al. Adsorption of copper ions by ion-imprinted simultaneous interpenetrating network hydrogel: Thermodynamics, morphology and mechanism[J]. Applied Surface Science, 2014, 305:412-418.

DOI: 10.1016/j.apsusc.2014.03.102

[2] Gong J, Wang X, Shao X, et al. Adsorption of heavy metal ions by hierarchically structured magnetite-carbonaceous spheres[J]. Talanta, 2012, 101(none):45-52.

DOI: 10.1016/j.talanta.2012.08.035

[3] Yu L I, Yan-Bin W, Xin G, et al. Risk assessment of heavy metals in soils and vegetables around non-ferrous metals mining and smelting sites, Baiyin, China[J]. J Environ Sci, 2006, 18(6): 1124-1134.

DOI: 10.1016/s1001-0742(06)60050-8

[4] Nagai D, Daimon T, Kawakami S , et al. High-Recovery Material for Mercury Ions Based on a Polyallylamine Hydrogel with Thiourea Groups at Cross-Linking Points[J]. Industrial & Engineering Chemistry Research, 2014, 53(8):3300-3304.

DOI: 10.1021/ie403118b

[5] Li N, Bai R. A Novel Amine-Shielded Surface Cross-Linking of Chitosan Hydrogel Beads for Enhanced Metal Adsorption Performance[J]. Industrial & Engineering Chemistry Research, 2005, 44(17):6692-6700.

DOI: 10.1021/ie050145k

[6] Zhu H, Fu Y, Jiang R, et al. Optimization of Copper(II) Adsorption onto Novel Magnetic Calcium Alginate/Maghemite Hydrogel Beads Using Response Surface Methodology[J]. Industrial & Engineering Chemistry Research, 2014, 53(10):4059-4066.

DOI: 10.1021/ie4031677

[7] Mi F.L, Wu S.J, Lin F.M. Adsorption of copper(II) ions by a chitosan–oxalate complex biosorbent[J]. International Journal of Biological Macromolecules, 2015, 72:136-144.

DOI: 10.1016/j.ijbiomac.2014.08.006

[8] Chang Y, Xing S , Wei X , et al. Lignosulfanate-assistant hydrothermal method for synthesis of titanate nanotubes with improved adsorption capacity for metal ions[J]. Materials Letters, 2014, 132:353-356.

DOI: 10.1016/j.matlet.2014.06.085

[9] Zhang X, Liu J, Kelly S J, et al. Biomimetic snowflake-shaped magnetic micro-/nanostructures for highly efficient adsorption of heavy metal ions and organic pollutants from aqueous solution[J]. Journal of Materials Chemistry A, 2014, 2(30):11759.

DOI: 10.1039/c4ta02058h

[10] Ijagbemi C.O, Baek M H, Kim D S. Adsorptive performance of un-calcined sodium exchanged and acid modified montmorillonite for Ni2+ removal: Equilibrium, kinetics, thermodynamics and regeneration studies[J]. Journal of Hazardous Materials, 2010, 174(1-3):746-755.

DOI: 10.1016/j.jhazmat.2009.09.115

[11] Asthana A, Verma R, Singh A K, et al. Silver Nanoparticle Entrapped Calcium-Alginate Beads for Fe(II) Removal via Adsorption[J]. Macromolecular Symposia, 2016, 366(1):42-51.

DOI: 10.1002/masy.201650045

[12] Zhang H, Liu Q, Wang J, et al. Preparation of magnetic calcium silicate hydrate for the efficient removal of uranium from aqueous systems[J]. RSC Adv. 2015, 5(8):5904-5912.

DOI: 10.1039/c4ra08678c