Preparation of geopolymer-based inorganic membrane for removing Ni2+ from wastewater

Ge, Yuanyuan; Yuan, Yuan; Wang, Kaituo; He, Yan; Cui, Xuemin

doi:10.1016/j.jhazmat.2015.08.006

Cited by 153 publications

(63 citation statements)

References 26 publications

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“…It consists of a polymeric silicon-oxygen-aluminium framework with alternating silicon and aluminium tetrahedral joined together in three directions by sharing all the oxygen atoms [17]. Fly ash, dolomite, expanded clay, natural zeolite, kaolinite and many are example of geopolymers.…”

Section: Geopolymermentioning

confidence: 99%

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

et al. 2017

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Abstract. Rapid development of advanced technology in Malaysia gave impact increasing in the accumulation of heavy metal every day in our daily life through wastewater. Long term exposure of human bodies to heavy metals susceptible to receives various infections and diseases. From an environmental and economic perspective, adsorption is acceptable process that can be applied in wastewater treatment. However, usage of activated carbon most acknowledged and costly adsorbents lead people to find an alternative to activated carbon. Several studies of physical properties of geopolymer make them gain attention to replace an activated carbon in the treatment of heavy metal. This paper review adsorption of heavy metal by using geopolymer.

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Section: Geopolymermentioning

confidence: 99%

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

et al. 2017

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“…Additionally, geopolymers have been studied for the adsorption of dyes [7][8][9][10], sulphate [11], As [12], Ca [13], Cd [14], Co [15,16], Cr [17,18], Cs [19][20][21], Cu [22][23][24][25], Ni [12,26], Pb [13,17,27,28], Sb [12], Sr [19] and Zn [17]. Geopolymers consist of an anionic framework of corner-sharing SiO 4 and AlO 4 where the exchangeable cations are located in the voids -similarly as with zeolites [29].…”

Section: Introductionmentioning

confidence: 99%

Removal of ammonium from municipal wastewater with powdered and granulated metakaolin geopolymer

Luukkonen

Věžníková

Tolonen

et al. 2017

Environmental Technology

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Ammonium [Formula: see text] removal from municipal wastewater poses challenges with the commonly used biological processes. Especially at low wastewater temperatures, the process is frequently ineffective and difficult to control. One alternative is to use ion-exchange. In the present study, a novel [Formula: see text] ion-exchanger, metakaolin geopolymer (MK-GP), was prepared, characterised, and tested. Batch experiments with powdered MK-GP indicated that the maximum exchange capacities were 31.79, 28.77, and 17.75 mg/g in synthetic, screened, and pre-sedimented municipal wastewater, respectively, according to the Sips isotherm (R ≥ 0.91). Kinetics followed the pseudo-second-order rate equation in all cases (k = 0.04-0.24 g mg min, R ≥ 0.97) and the equilibrium was reached within 30-90 min. Granulated MK-GP proved to be suitable for a continuous column mode use. Granules were high-strength, porous at the surface and could be regenerated multiple times with NaCl/NaOH. A bench-scale pilot test further confirmed the feasibility of granulated MK-GP in practical conditions at a municipal wastewater treatment plant: consistently <4 mg/L [Formula: see text] could be reached even though wastewater had low temperature (approx. 10°C). The results indicate that powdered or granulated MK-GP might have practical potential for removal and possible recovery of [Formula: see text] from municipal wastewaters. The simple and low-energy preparation method for MK-GP further increases the significance of the results.

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“…However, also materials obtained from a reaction between alumino-silicate precursors and phosphoric acid are sometimes referred to as acid-activated geopolymers [3]. Geopolymers have recently gained interest in several water and wastewater treatment applications such as adsorbents [4][5][6][7][8][9][10][11], membrane material [12], photocatalysts [13,14], functional construction materials [15,16], or substrate for biofilm reactors [17]. In many of the aforementioned applications, the use of geopolymers is based on their ion exchange capacity and porous structure.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the metakaolin geopolymer preparation for maximized ammonium adsorption capacity

et al. 2017

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Geopolymers are functional materials that can be used in various environmental applications such as adsorbents in pollutant removal from wastewaters. Metakaolin geopolymer (MK-GP) has been proven to be especially suitable for ammonium (NH4 +) removal from wastewater. In this research, the optimal reagent and raw material ratios in the preparation of MK-GP in terms of NH4 + adsorption capacity were investigated. The response surface methodology based on the face centered central composite design was used to optimize the levels of three factors: the amounts of hydroxide, silicate, and metakaolin. In addition, the effect of Na or K as the charge-balancing cation was studied. Empirical models were fitted to the experimental data using multiple linear regression. The significance of the models was confirmed by means of analysis of variance. Optimal NH4 + removal efficiency was achieved when the amount of hydroxide and silicate were maximized, the amount of metakaolin was minimized, and Na-based reagents were used. These trends are most likely a result of optimized conversion of metakaolin into MK-GP.

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Preparation of geopolymer-based inorganic membrane for removing Ni2+ from wastewater

Cited by 153 publications

References 26 publications

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

Review on Adsorption of Heavy Metal in Wastewater by Using Geopolymer

Removal of ammonium from municipal wastewater with powdered and granulated metakaolin geopolymer

Optimization of the metakaolin geopolymer preparation for maximized ammonium adsorption capacity

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