Use of halloysite nanotubes to reduce ammonium concentration in water and wastewaters

Bekiari, Vlasoula; Panagopoulos, George; Papoulis, Dimitrios; Panagiotaras, Dionisios

doi:10.1080/14328917.2016.1215079

Cited by 10 publications

(13 citation statements)

References 27 publications

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“…However, negative correlations between the sorption capacity of the applied materials and temperature increase have been documented in the literature, e.g., for some natural zeolites [61,62] and halloysite [63]. A relationship similar to that presented herein was observed by Jing et al [64] for halloysite from a Chinese reservoir; in those studies, the sorption capacity increased with rising temperature.…”

Section: Appl Sci 2019 9 X For Peer Review 13 Of 22supporting

confidence: 85%

“…A similar trend of temperature impact on the removal processes was also observed for biogenic components at initial concentrations of 10 mg/L, but the thermodynamic parameters of the process in the temperature range of 3 °C to 22 °C (ΔH 0 > 0) pointed to the endothermic character of the process (Table 4). However, negative correlations between the sorption capacity of the applied materials and temperature increase have been documented in the literature, e.g., for some natural zeolites [61,62] and halloysite [63]. A relationship similar to that presented herein was observed by Jing et al [64] for halloysite from a Chinese reservoir; in those studies, the sorption capacity increased with rising temperature.…”

Section: Appl Sci 2019 9 X For Peer Review 13 Of 22supporting

confidence: 85%

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The Impact of Temperature on the Removal of Inorganic Contaminants Typical of Urban Stormwater

Fronczyk

Mumford

2019

Applied Sciences

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Appropriate management of urban stormwater requires consideration of both water quantity, resulting from flood control requirements, and water quality, being a consequence of contaminant distribution via runoff water. This article focuses on the impact of temperature on the efficiency of stormwater treatment processes in permeable infiltration systems. Studies of the removal capacity of activated carbon, diatomite, halloysite, limestone sand and zeolite for select heavy metals (Cu and Zn) and biogenes (NH4-N and PO4-P) were performed in batch conditions at 3, 6, 10, 15, 22, 30 and 40 °C at low initial concentrations, and maximum sorption capacities determined at 3, 10, 22 and 40 °C. A decrease in temperature to 3 °C reduced the maximum sorption capacities (Qmax) of the applied materials in the range of 10% for diatomite uptake of PO4-P, to 46% for halloysite uptake of Cu. Only the value of Qmax for halloysite, limestone sand and diatomite for NH4-N uptake decreased slightly with temperature increase. A positive correlation was also observed for the equilibrium sorption (Qe) of Cu and Zn for analyses performed at low concentrations (with the exception of Zn sorption on limestone sand). In turn, for biogenes a rising trend was observed only in the range of 3 °C to 22 °C, whereas further temperature increase caused a decrease of Qe. Temperature had the largest influence on the removal of copper and the smallest on the removal of phosphates. It was also observed that the impact of temperature on the process of phosphate removal on all materials and ammonium ions on all materials, with the exception of zeolite, was negligible.

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Section: Appl Sci 2019 9 X For Peer Review 13 Of 22supporting

confidence: 85%

Section: Appl Sci 2019 9 X For Peer Review 13 Of 22supporting

confidence: 85%

The Impact of Temperature on the Removal of Inorganic Contaminants Typical of Urban Stormwater

Fronczyk

Mumford

2019

Applied Sciences

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“…This indicates that the strong interaction of Mg-OH may be replaced by the Zn-OH group. To conclude, the equation for the HCCE can be summarized as below [ 28 , 29 ]: …”

Section: Resultsmentioning

confidence: 99%

Inorganic Colloidal Electrolyte for Highly Robust Zinc-Ion Batteries

et al. 2021

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Zinc-ion batteries (ZIBs) is a promising electrical energy storage candidate due to its eco-friendliness, low cost, and intrinsic safety, but on the cathode the element dissolution and the formation of irreversible products, and on the anode the growth of dendrite as well as irreversible products hinder its practical application. Herein, we propose a new type of the inorganic highly concentrated colloidal electrolytes (HCCE) for ZIBs promoting simultaneous robust protection of both cathode/anode leading to an effective suppression of element dissolution, dendrite, and irreversible products growth. The new HCCE has high Zn2+ ion transference number (0.64) endowed by the limitation of SO42−, the competitive ion conductivity (1.1 × 10–2 S cm−1) and Zn2+ ion diffusion enabled by the uniform pore distribution (3.6 nm) and the limited free water. The Zn/HCCE/α-MnO2 cells exhibit high durability under both high and low current densities, which is almost 100% capacity retention at 200 mA g−1 after 400 cycles (290 mAh g−1) and 89% capacity retention under 500 mA g−1 after 1000 cycles (212 mAh g−1). Considering material sustainability and batteries’ high performances, the colloidal electrolyte may provide a feasible substitute beyond the liquid and all-solid-state electrolyte of ZIBs.

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“…The separated chloride liquid was filtered off and then replaced by fresh chloride solution. Stirring, centrifugation, and refilling were repeated five times [ 60 ]. The procedure was repeated several times in order for all or at least almost all the exchangeable cations to be replaced by Cu and Zn cations.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of the Antimicrobial Protection of Pharmaceutical Kaolin and Talc Modified with Copper and Zinc

et al. 2021

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Six pharmaceutical pastes were prepared using chemically modified kaolin and talc powders. Tests were conducted to determine their structural and chemical characteristics as well as their antimicrobial protection, thus rendering them suitable for cosmetic and pharmaceutical uses. Kaolin and talc were treated chemically via the cation exchange method to load the clay particles with copper and zinc ions, two cations well known for their antimicrobial properties. Mineralogical analyses were conducted by using X-ray diffraction (XRD) before and after the modification, confirming the mineralogical purity of the samples. Scanning electron microscopy was also used in conjunction with energy dispersed spectroscopy (SEM-EDS) to obtain chemical mapping images, revealing the dispersion of the added metals upon the clay minerals surfaces. Moreover, chemical analysis has been performed (XRF) to validate the enrichment of the clays with each metal utilizing the cation exchange capacity. All modified samples showed the expected elevated concentration in copper or zinc in comparison to their unmodified versions. From the X-ray photoelectron spectroscopy (XPS), the chemical state of the samples’ surfaces was investigated, revealing the presence of salt compounds and indicating the oxidation state of adsorbed metals. Finally, the resistance of pastes in microbial growth when challenged with bacteria, molds, and yeasts was assessed. The evaluation is based on the European Pharmacopeia (EP) criteria.

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Use of halloysite nanotubes to reduce ammonium concentration in water and wastewaters

Cited by 10 publications

References 27 publications

The Impact of Temperature on the Removal of Inorganic Contaminants Typical of Urban Stormwater

The Impact of Temperature on the Removal of Inorganic Contaminants Typical of Urban Stormwater

Inorganic Colloidal Electrolyte for Highly Robust Zinc-Ion Batteries

Evaluation of the Antimicrobial Protection of Pharmaceutical Kaolin and Talc Modified with Copper and Zinc

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