[1] [1] DAVIDOVITS J. Geopolymers[J]. Journal of Thermal Analysis, 1991, 37(8): 1633-1656.

[2] [2] DAVIDOVITS J. Geopolymers and geopolymeric materials[J]. Journal of Thermal Analysis, 1989, 35(2): 429-441.

[4] [4] STURM P, GLUTH G J G, SIMON S, et al. The effect of heat treatment on the mechanical and structural properties of one-part geopolymer-zeolite composites[J]. Thermochimica Acta, 2016, 635: 41-58.

[6] [6] GLUKHOVSKY V D. Soil silicates: their properties, technology and manufacturing and fields of application[D]. Uraine: Civil Engineering Institute, 1965.

[7] [7] PROVIS J L, LUKEY G C, VAN DEVENTER J S J. Do geopolymers actually contain nanocrystalline zeolites? A reexamination of existing results[J]. Chemistry of Materials, 2005, 17(12): 3075-3085.

[8] [8] YAN H, CUI X M, JIN M, et al. The hydrothermal transformation of solid geopolymers into zeolites[J]. Microporous and Mesoporous Materials, 2012, 161: 187-192.

[9] [9] ZHANG J, HE Y, WANG Y P, et al. Synthesis of a self-supporting faujasite zeolite membrane using geopolymer gel for separation of alcohol/water mixture[J]. Materials Letters, 2014, 116: 167-170.

[10] [10] ZHENG G J, CUI X M, ZHANG W P, et al. Preparation of geopolymer precursors by sol-gel method and their characterization[J]. Journal of Materials Science, 2009, 44(15): 3991-3996.

[11] [11] WENG L, SAGOE-CRENTSIL K. Dissolution processes, hydrolysis and condensation reactions during geopolymer synthesis: part I—low Si/Al ratio systems[J]. Journal of Materials Science, 2007, 42(9): 2997-3006.

[12] [12] DAVIDOVITS J. Properties of geopolymer cements[A]. First international conference on alkaline cements and concretes, 1994, 1: 131-149.

[13] [13] BIRANCHI P. 3D printing of high-volume fly ash mixtures for digital concrete construction[D]. Singapore: Nanyang Technological University, 2019.

[14] [14] ELGARAHY A M, MAGED A, ELOFFY M G, et al. Geopolymers as sustainable eco-friendly materials: classification, synthesis routes, and applications in wastewater treatment[J]. Separation and Purification Technology, 2023, 324: 124631.

[15] [15] PARATHI S, NAGARAJAN P, PALLIKKARA S A. Ecofriendly geopolymer concrete: a comprehensive review[J]. Clean Technologies and Environmental Policy, 2021, 23(6): 1701-1713.

[19] [19] SHI S, LI H, ZHOU Q Z, et al. Alkali-activated fly ash cured with pulsed microwave and thermal oven: a comparison of reaction products, microstructure and compressive strength[J]. Cement and Concrete Research, 2023, 166: 107104.

[20] [20] YUAN J K, HE P G, JIA D C. The effect of Si/Al on mechanical properties and fracture behavior of stainless steel mesh/Crp reinforced geopolymer composites[J]. MATEC Web of Conferences, 2017, 97: 01011.

[21] [21] LI Z F, GAO Y F, ZHANG J, et al. Effect of particle size and thermal activation on the coal gangue based geopolymer[J]. Materials Chemistry and Physics, 2021, 267: 124657.

[24] [24] LAN T, LI P F, REHMAN F U, et al. Efficient adsorption of Cd2+ from aqueous solution using metakaolin geopolymers[J]. Environmental Science and Pollution Research, 2019, 26(32): 33555-33567.

[25] [25] MALEKI A, HAJIZADEH Z, SHARIFI V, et al. A green, porous and eco-friendly magnetic geopolymer adsorbent for heavy metals removal from aqueous solutions[J]. Journal of Cleaner Production, 2019, 215: 1233-1245.

[26] [26] BOUNA L, FAKIR A A E, BENLHACHEMI A, et al. Synthesis and characterization of mesoporous geopolymer based on Moroccan kaolinite rich clay[J]. Applied Clay Science, 2020, 196: 105764.

[27] [27] ACISLI O, ACAR I, KHATAEE A. Preparation of a fly ash-based geopolymer for removal of a cationic dye: isothermal, kinetic and thermodynamic studies[J]. Journal of Industrial and Engineering Chemistry, 2020, 83: 53-63.

[28] [28] ACISLI O, ACAR I, KHATAEE A. Preparation of a surface modified fly ash-based geopolymer for removal of an anionic dye: parameters and adsorption mechanism[J]. Chemosphere, 2022, 295: 133870.

[29] [29] SELKL T, SUOPAJRVI T, SIRVI J A, et al. Surface modification of cured inorganic foams with cationic cellulose nanocrystals and their use as reactive filter media for anionic dye removal[J]. ACS Applied Materials & Interfaces, 2020, 12(24): 27745-27757.

[30] [30] CHEN X, GUO Y G, DING S, et al. Utilization of red mud in geopolymer-based pervious concrete with function of adsorption of heavy metal ions[J]. Journal of Cleaner Production, 2019, 207: 789-800.

[31] [31] MALEKI A, MOHAMMAD M, EMDADI Z, et al. Adsorbent materials based on a geopolymer paste for dye removal from aqueous solutions[J]. Arabian Journal of Chemistry, 2020, 13(1): 3017-3025.

[33] [33] ZHANG Y J, HE P Y, YANG M Y, et al. A new graphene bottom ash geopolymeric composite for photocatalytic H2 production and degradation of dyeing wastewater[J]. International Journal of Hydrogen Energy, 2017, 42(32): 20589-20598.

[34] [34] INNOCENTINI M D M, BOTTI R F, BASSI P M, et al. Lattice-shaped geopolymer catalyst for biodiesel synthesis fabricated by additive manufacturing[J]. Ceramics International, 2019, 45(1): 1443-1446.

[36] [36] CHINDAPRASIRT P, JITSANGIAM P, CHALEE W, et al. Case study of the application of pervious fly ash geopolymer concrete for neutralization of acidic wastewater[J]. Case Studies in Construction Materials, 2021, 15: e00770.

[37] [37] EL ALOUANI M, ALEHYEN S, EL ACHOURI M, et al. Preparation, characterization, and application of metakaolin-based geopolymer for removal of methylene blue from aqueous solution[J]. Journal of Chemistry, 2019, 2019(1): 4212901.

[38] [38] NOVAIS R M, ASCENS O G, TOBALDI D M, et al. Biomass fly ash geopolymer monoliths for effective methylene blue removal from wastewaters[J]. Journal of Cleaner Production, 2018, 171: 783-794.

[39] [39] GE Y Y, CUI X M, LIAO C L, et al. Facile fabrication of green geopolymer/alginate hybrid spheres for efficient removal of Cu(II) in water: batch and column studies[J]. Chemical Engineering Journal, 2017, 311: 126-134.

[40] [40] CHENG T W, LEE M L, KO M S, et al. The heavy metal adsorption characteristics on metakaolin-based geopolymer[J]. Applied Clay Science, 2012, 56: 90-96.

[41] [41] LIU Y, YAN C J, ZHANG Z H, et al. A comparative study on fly ash, geopolymer and faujasite block for Pb removal from aqueous solution[J]. Fuel, 2016, 185: 181-189.

[42] [42] ROEK P, KRL M, MOZGAWA W. Spectroscopic studies of fly ash-based geopolymers[J]. Spectrochimica Acta Part A, Molecular and Biomolecular Spectroscopy, 2018, 198: 283-289.

[43] [43] TANG Q, WANG K T, YASEEN M, et al. Synthesis of highly efficient porous inorganic polymer microspheres for the adsorptive removal of Pb2+ from wastewater[J]. Journal of Cleaner Production, 2018, 193: 351-362.

[44] [44] TIAN Q Z, SASAKI K. Application of fly ash-based geopolymer for removal of cesium, strontium and arsenate from aqueous solutions: kinetic, equilibrium and mechanism analysis[J]. Water Science and Technology, 2019, 79(11): 2116-2125.

[45] [45] SIYAL A A, SHAMSUDDIN M R, KHAHRO S H, et al. Optimization of synthesis of geopolymer adsorbent for the effective removal of anionic surfactant from aqueous solution[J]. Journal of Environmental Chemical Engineering, 2021, 9(1): 104949.

[46] [46] PADMAPRIYA M, RAMESH S T, BIJU V M. Synthesis of seawater based geopolymer: characterization and adsorption capacity of methylene blue from wastewater[J]. Materials Today: Proceedings, 2022, 51: 1770-1776.

[47] [47] EL ALOUANI M, ALEHYEN S, EL ACHOURI M, et al. Comparative study of the adsorption of micropollutant contained in aqueous phase using coal fly ash and activated coal fly ash: kinetic and isotherm studies[J]. Chemical Data Collections, 2019, 23: 100265.

[48] [48] NOVAIS R M, BURUBERRI L H, SEABRA M P, et al. Novel porous fly-ash containing geopolymer monoliths for lead adsorption from wastewaters[J]. Journal of Hazardous Materials, 2016, 318: 631-640.

[49] [49] AKAR S T, KOC E, SAYIN F, et al. Design and modeling of the decolorization characteristics of a regenerable and eco-friendly geopolymer: batch and dynamic flow mode treatment aspects[J]. Journal of Environmental Management, 2021, 298: 113548.

[50] [50] NJIMOU J R, PENGOU M, TCHAKOUTE H K, et al. Removal of lead ions from aqueous solution using phosphate-based geopolymer cement composite[J]. Journal of Chemical Technology & Biotechnology, 2021, 96(5): 1358-1369.

[51] [51] LAN T, GUO S W, LI X L, et al. Mixed precursor geopolymer synthesis for removal of Pb(II) and Cd(II)[J]. Materials Letters, 2020, 274: 127977.

[52] [52] EL ALOUANI M, ALEHYEN S, EL ACHOURI M, et al. Removal of cationic dye-methylene blue-from aque ous solution by adsorption on fly ash-based geopolymer[J]. Journal of Materials and Environmental Sciences, 2018, 9(1): 32-46.

[53] [53] HUA P Y, SELLAOUI L, FRANCO D, et al. Adsorption of acid green and procion red on a magnetic geopolymer based adsorbent: experiments, characterization and theoretical treatment[J]. Chemical Engineering Journal, 2020, 383: 123113.

[54] [54] BARBOSA T R, FOLETTO E L, DOTTO G L, et al. Preparation of mesoporous geopolymer using metakaolin and rice husk ash as synthesis precursors and its use as potential adsorbent to remove organic dye from aqueous solutions[J]. Ceramics International, 2018, 44(1): 416-423.

[59] [59] KAYA-ZKIPER K, UZUN A, SOYER-UZUN S. Red mud- and metakaolin-based geopolymers for adsorption and photocatalytic degradation of methylene blue: towards self-cleaning construction materials[J]. Journal of Cleaner Production, 2021, 288: 125120.

[60] [60] SANG M M, ZHAO H Z, LI Y, et al. The adsorption properties of steel slag-based porous geopolymer for Cu2+ removal[J]. Minerals Engineering, 2023, 201: 108225.

[61] [61] CARVALHEIRAS J A, NOVAIS R M, LABRINCHA J A A. Metakaolin/red mud-derived geopolymer monoliths: novel bulk-type sorbents for lead removal from wastewaters[J]. Applied Clay Science, 2023, 232: 106770.

[62] [62] AL-ZBOON K, AL-HARAHSHEH M S, HANI F B. Fly ash-based geopolymer for Pb removal from aqueous solution[J]. Journal of Hazardous Materials, 2011, 188(1/2/3): 414-421.

[63] [63] YU Z F, SONG W F, LI J Y, et al. Improved simultaneous adsorption of Cu(II) and Cr(VI) of organic modified metakaolin-based geopolymer[J]. Arabian Journal of Chemistry, 2020, 13(3): 4811-4823.

[65] [65] ONUTAI S, KOBAYASHI T, THAVORNITI P, et al. Porous fly ash-based geopolymer composite fiber as an adsorbent for removal of heavy metal ions from wastewater[J]. Materials Letters, 2019, 236: 30-33.

[66] [66] LIU Y, ZHAO S H, QIU X M, et al. Clinoptilolite based zeolite-geopolymer hybrid foams: potential application as low-cost sorbents for heavy metals[J]. Journal of Environmental Management, 2023, 330: 117167.

[72] [72] SALAM M A, MOKHTAR M, ALBUKHARI S M, et al. Synthesis of zeolite/geopolymer composite for enhanced sequestration of phosphate (PO43-) and ammonium (NH4+) ions; equilibrium properties and realistic study[J]. Journal of Environmental Management, 2021, 300: 113723.

[73] [73] LUUKKONEN T, VNKOV K, TOLONEN E T, et al. Removal of ammonium from municipal wastewater with powdered and granulated metakaolin geopolymer[J]. Environmental Technology, 2018, 39(4): 414-423.

[74] [74] SANGUANPAK S, WANNAGON A, SAENGAM C, et al. Porous metakaolin-based geopolymer granules for removal of ammonium in aqueous solution and anaerobically pretreated piggery wastewater[J]. Journal of Cleaner Production, 2021, 297: 126643.

[75] [75] MEDRI V, PAPA E, LANDI E, et al. Ammonium removal and recovery from municipal wastewater by ion exchange using a metakaolin K-based geopolymer[J]. Water Research, 2022, 225: 119203.