Investigation on the copper ion removal potential of a facile-fabricated foamed geopolymer sphere for wastewater remediation

Tan, Tee How; Mo, Kim Hung; Lai, Sai Hin; Ling, Tung-Chai

doi:10.1016/j.clema.2022.100088

Cited by 8 publications

(5 citation statements)

References 37 publications

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“…The foaming agent was sodium peroxide, which determined the formation of pores in the action of wollastonite. The test confirmed the physicochemical stability up to a temperature of approximately 200 °C [25].…”

Section: State Of the Artsupporting

confidence: 63%

Influence of elevated temperatures on the mechanical properties of foamed geopolymer materials

Figiela

Korniejenko

Hebdowska-Krupa

2023

Materialwissenschaft Werkst

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Current research focuses heavily on geopolymer concrete as possible applications for insulation materials. The aim of the research is to test the strength properties of lightweight geopolymer concrete after exposure to high temperatures. Waste material from the Wieczorek mine (Poland) was used to produce the foamed geopolymers. Alkaline activation took place by mixing the mine powder with an aqueous solution of sodium hydroxide combined with an aqueous sodium silicate with a concentration of 10 M. Prepared geopolymer samples after temperature curing at 75 °C for 24 hours in a laboratory dryer, they were seasoned for 28 days, after which the strength properties were determined. Mechanical tests: compressive strength and bending strength were carried out at temperatures: 20 °C, 200 °C, 600 °C, 800 °C, 1100 °C. Research has shown the precursor activation with the presence of hydrogen peroxide enabled the manufacturing of foamed geopolymers. Heating in the temperature range up to 1100 °C influenced, to some extent, the total porosity of the tested foams. The geopolymer foams based on coal gangue present stable mechanical properties in the range up to 800 °C. No sharp mechanical performances decrease or material chipping was observed. Only colour change of heated samples occurred.

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Section: State Of the Artsupporting

confidence: 63%

Influence of elevated temperatures on the mechanical properties of foamed geopolymer materials

Figiela

Korniejenko

Hebdowska-Krupa

2023

Materialwissenschaft Werkst

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“…Then, it was washed several times with deionized water until the bathwater showed a pH of 7 ± 0.5 and dried before being used for the test to ensure the rigor and effectiveness of the MKG adsorbent and, consequently, avoid any side effects in the adsorption system (Novais et al, 2016; Tan et al, 2022). Finally, it was sieved into 150 μm size and dried at 105°C, 72 h in an oven Model 101‐2EBS (Yong Guang Ming Medical Instrument, Co. Ltd, Beijing) for further use as an adsorbent (Novais et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

Metakaolin‐based geopolymer for mercury removal from model wastewater

Santos

Bao

Musah

2022

Water Environment Research

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Mercury is recognized as a serious hazard, nature bioaccumulative and persistent to the environment. Developing a low‐cost, effective, eco‐friendly adsorbent for removing mercury constitutes an urgent task. In this study, metakaolin‐based geopolymer (MKG) was synthesized and applied to remove mercury from model wastewater by adsorption. The samples were characterized by X‐ray fluorescence (XRF), Brunauer–Emmett–Teller (BET), X‐ray diffraction (XRD) pattern, Fourier transform infrared (FTIR), and scanning electron microscope (SEM). They confirmed the synthesis of geopolymer due to the mass loss (LOI), crystallinity, peak changes, increase in surface area, and pore size. The highest removal efficiency recorded was 65.1%, with a corresponding adsorption capacity of 38.1 mg/g for MKG in 50 mg of dosage, 50 mg/L initial concentration, at a temperature of 25°C, contact time of 5 h and optimal pH of 3. The kinetic studies showed that mercury removal increased with the contact time until equilibrium after an hour. The adsorption equilibrium data were best described by Freundlich, whereas the pseudo‐second‐order model best fitted the adsorption kinetics. This may be indicative that chemisorption controlled the adsorption process. The stability studies of MKG adsorbent within the four reagents revealed that MKG has good stability in water, followed by 10% HCl, 3M NaCl, and 5% NaOH. In contrast, the desorption revealed the MKG represented the highest desorption efficiency in 10% HCl, followed by 3M NaCl, deionized water and 5% NaOH, respectively. The highest desorption efficiency was 96.83% for 10% HCl, followed by 91.83% for 3M NaCl, 82.55% for H2O, and 50.72% for 5% NaOH. Practitioner Points A low‐cost metakaolin‐based geopolymer (MKG) was synthesized and applied as an adsorbent for removing Hg(II). The most dominant mechanism involved in the removal process of Hg(II) was chemisorption. The maximum adsorption capacity obtained in this study was 38.1 mg/g. Hg(II) removal is influenced by pH zeta potential and temperature. MKG shows good potential for the effective removal of mercury from modeled wastewater.

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“…AAFC has been proposed as a potential heavy metal ions adsorbent due to the presence of many active binding sites provided by the many pores in the material. Tan et al [99] proposed that the production of the AAFC sphere could be a better modality for wastewater treatment due to its facilitative recyclability. Under this condition, efflorescence might have a positive effect, including the combination of heavy metal ions and the leached hydroxide ions and the bacteria treatment due to the increasing pH value caused by the efflorescence items and hydroxide ions, as shown in Figure 5.…”

Section: Wide Practical Applicationmentioning

confidence: 99%

Influence Factors in the Wide Application of Alkali-Activated Materials: A Critical Review about Efflorescence

et al. 2022

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Applications related to alkali-activated materials (AAMs) have received much attention due to their excellent mechanical properties and low-energy production. Although much research has focused on developing AAMs, their application is still limited. One of the primary reasons is the efflorescence. Not only does efflorescence affect the material aesthetics, but it also affects the mechanical performance, leading to a decrease in material quality. This paper first summarizes the current research on AAMs efflorescence. The formation process of efflorescence is divided into three parts: alkaline cation leaching, air carbonation, and efflorescence formation. Furthermore, the influences caused by different factors, including raw materials, curing conditions, AAMs modalities, etc., on the efflorescence are proposed. This paper highlights the solutions for efflorescence by avoiding free alkaline cation leaching and preventing air carbonation. The advantages and disadvantages of efflorescence are discussed in-depth, showing that it can be exploited under certain conditions, such as in wastewater treatment. This paper has important implications for the practical preparation and application of AAMs.

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Investigation on the copper ion removal potential of a facile-fabricated foamed geopolymer sphere for wastewater remediation

Cited by 8 publications

References 37 publications

Influence of elevated temperatures on the mechanical properties of foamed geopolymer materials

Influence of elevated temperatures on the mechanical properties of foamed geopolymer materials

Metakaolin‐based geopolymer for mercury removal from model wastewater

Influence Factors in the Wide Application of Alkali-Activated Materials: A Critical Review about Efflorescence

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