Mechanical strength and cationic dye adsorption ability of metakaolin-based geopolymer spheres
Source abstract
Abstract
Metakaolin-based geopolymer spheres shaped by three different dripping techniques were investigated in terms of compressive strength and dye adsorption ability. Spheres were produced by injection and solidification in polyethylene glycol (PEG) or liquid nitrogen (ice-templating) and ionotropic gelation (alginate in calcium chloride). Mechanical tests by ISO 18591 evidenced that compressive strength was strictly linked to porosity and composition of the spheres, being 12.9 MPa with 29% of porosity for spheres produced in PEG, 2.1 MPa with a porosity of 64% for spheres shaped in liquid nitrogen and up to 19.6 MPa with a porosity of 59% for hybrid spheres with a skeleton of Ca-alginate. The influence of contact time and initial concentration on a cationic dye (methylene blue) adsorption was studied. Removal efficiency was related to morphology, porosity and specific surface area: after 24 h the percentage of adsorption was 94-98% for spheres shaped in liquid nitrogen while below 75% for hybrid spheres and spheres produced in PEG. By adding TiO P25 as photocatalytic phase to the hybrid spheres, an increase of removal efficiency of 33% was observed after 90 min under UV irradiation.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Concrete and Cement Materials Research · Innovative concrete reinforcement materials · Smart Materials for Construction
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (54)
Show source-provided references
1. Inverse leidenfrost effect: levitating drops on liquid nitrogen10.1021/acs.langmuir.6b00574 ↗
2. Structural characteristics of hazardous organic dyes and relationship between membrane fouling and organic removal efficiency in fluidized ceramic membrane reactor10.1016/j.jclepro.2019.05.244 ↗
3. Promoted dye adsorption performance over desilicated natural zeolite10.1016/j.micromeso.2011.05.012 ↗
4. Synthesis and catalytic properties of new sustainable aluminosilicate heterogeneous catalysts derived from fly ash10.1021/acssuschemeng.7b04923 ↗
5. Red mud-based geopolymers with tailored alkali diffusion properties and pH buffering ability10.1016/j.jclepro.2017.01.150 ↗
6. Metal ions as probes for characterization of geopolymer materials10.1111/j.1551-2916.2008.02577.x ↗
7. The exchange adsorption of ions from aqueous solutions by organic zeolites. II. Kinetics110.1021/ja01203a066 ↗
8. Crank · 1933
9. The influence of solution viscosities and surface tension on calcium-alginate microbead formation using dripping technique10.1016/j.foodhyd.2016.06.029 ↗
10. Davidovits · 2008
11. Freeze-casting of porous ceramics: a review of current achievements and issues10.1002/adem.200700270 ↗
12. Ice-templated porous alumina structures10.1016/j.actamat.2006.11.003 ↗
13. Aluminosilicate inorganic polymers (geopolymers): Emerging ion exchangers for removal of metal ions
14. Porous geopolymeric spheres for removal of Cu(II) from aqueous solution: synthesis and evaluation10.1016/j.jhazmat.2014.09.038 ↗
15. Facile fabrication of green geopolymer/alginate hybrid spheres for efficient removal of Cu(II) in water: batch and column studies10.1016/j.cej.2016.11.079 ↗
16. Cross-linked biodegradable alginate hydrogel floating beads for stomach site specific controlled delivery of metronidazole
17. Pseudo-second order model for sorption processes10.1016/S0032-9592(98)00112-5 ↗
18. Photocatalytic degradation pathway of methylene blue in water10.1016/S0926-3373(00)00276-9 ↗
19. Adsorption of acid green and procion red on a magnetic geopolymer based adsorbent: experiments, characterization and theoretical treatment10.1016/j.cej.2019.123113 ↗
20. Polymerization of aqueous silica in H2O–K2O solutions at 25–200 °C and 1 bar to 20 kbar10.1016/j.chemgeo.2010.12.022 ↗
21. The concept of “capacity” in zeolite ion-exchange systems10.1016/j.jcis.2004.08.082 ↗
22. Water recycling from desalination and purification process of reactive dye manufacturing industry by combined membrane filtration10.1016/j.jclepro.2004.02.044 ↗
23. Response surface optimization of electrochemical treatment of textile dye wastewater and heat treatments10.1016/j.jhazmat.2006.11.031 ↗
24. Microstructure and microchemistry of fully-reacted geopolymers and geopolymer matrix composites10.1002/9781118406892.ch15 ↗
25. Zur theorie der sogenannten adsorption geloster stoffe
26. Alkali-bonded ceramics with hierarchical tailored porosity10.1016/j.clay.2012.09.027 ↗
27. Geopolymeric adsorbents from fly ash for dye removal from aqueous solution10.1016/j.jcis.2006.03.062 ↗
28. Freeze casting of porous materials: Review of critical factors in microstructure evolution10.1179/1743280411Y.0000000011 ↗
29. Filtration and adsorption properties of porous calcium alginate membrane for methylene blue removal from water10.1016/j.cej.2017.01.098 ↗
30. Removal of anionic reactive dyes from water using anion exchange membranes as adsorbers10.1016/j.watres.2007.01.023 ↗
31. Role of the morphology and the dehydroxylation of metakaolins on geopolymerization10.1016/j.clay.2010.10.010 ↗
32. Metakaolin-based geopolymer beads: production methods and characterization
33. Adsorption of basic dyes on granular activated carbon and natural zeolite10.1016/S0043-1354(01)00056-2 ↗
34. Geopolymers as solid adsorbent for CO2 capture10.1016/j.ces.2016.04.013 ↗
35. Characterization of novel geopolymer - zeolite composites as solid adsorbents for CO2 capture10.1016/j.cej.2018.02.050 ↗
36. Porous geopolymer spheres as novel pH buffering materials10.1016/j.jclepro.2016.12.008 ↗
37. Synthesis of porous biomass fly ash-based geopolymer spheres for efficient removal of methylene blue from wastewaters10.1016/j.jclepro.2018.09.265 ↗
38. Synthesis of porous hierarchical geopolymer monoliths by ice-templating10.1016/j.micromeso.2015.05.043 ↗
39. Ice-templated geopolymer—Fe/Mn oxide composites conceived as oxygen carriers10.3390/ceramics2010014 ↗
40. Ice-templated geopolymer beads for dye removal10.1016/j.jcis.2020.03.104 ↗
41. Dyes—environmental impact and remediation
42. Detoxification of azo dyes in the context of environmental processes10.1016/j.chemosphere.2016.04.068 ↗
43. Geopolymer based catalysts-New group of catalytic materials10.1016/j.cattod.2010.09.008 ↗
44. A crosslinking-induced precipitation process for the simultaneous removal of poly(vinyl alcohol) and reactive dye: the importance of covalent bond forming and magnesium coagulation10.1016/j.cej.2019.05.203 ↗
45. A review on geopolymers as emerging materials for the adsorption of heavy metals and dyes10.1016/j.jenvman.2018.07.046 ↗
46. Processing routes to macroporous ceramics: a Review10.1111/j.1551-2916.2006.01044.x ↗
47. Removal of dyes and industrial dye wastes by magnesium chloride10.1016/S0043-1354(99)00151-7 ↗
48. Preparation and characterization of porous metakaolin-based inorganic polymer spheres as an adsorbent10.1016/j.matdes.2015.09.126 ↗
49. Application of zeolite MCM-22 for basic dye removal from wastewater10.1016/j.jcis.2005.08.006 ↗
50. Removal of cationic dye methyl violet 2B from water by cation exchange membranes10.1016/j.memsci.2007.10.035 ↗
51. Textile dye wastewater characteristics and constituents of synthetic effluents: a critical review10.1007/s13762-018-2130-z ↗
52. Fly ash-based geopolymer as a novel photocatalyst for degradation of dye from wastewater10.1016/j.partic.2012.10.007 ↗
53. A facile and low-cost synthesis of granulated blast furnace slag-based cementitious material coupled with Fe2O3 catalyst for treatment of dye wastewater10.1016/j.apcatb.2013.02.025 ↗
54. Recent advances for dyes removal using novel adsorbents: a review10.1016/j.envpol.2019.05.072 ↗