Adsorption of ammonium on clinoptilolite in presence of competing cations: Investigation on groundwater remediation

Vocciante, Marco; D’Auris, Alessandra De Folly; Finocchi, Antonio; Tagliabue, Marco; Bellettato, Michela; Ferrucci, Aurelio; Reverberi, Andrea P.; Ferro, Sergio

doi:10.1016/j.jclepro.2018.07.025

Cited by 88 publications

(26 citation statements)

References 36 publications

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“…For sample g, the concentration was 0.3 cm 3 in 3 cm 3 of water. Very often, chemical methods are a first-rank choice in several synthesis techniques concerning the production of nanosorbents for environmental remediation [4], the preparation of nitrogen-doped graphene (NG) as a metal-free carbon-based catalyst to degrade recalcitrant organics [5], the synthesis of nanoceramics for application in dentistry [6], the fabrication of nanosized sensors to ensure safety conditions in oxidation processes [7], and the production of zerovalent NPs by redox processes [8]. The latter are generally carried out in liquid phases [9], where a precursor containing the ion of the element forming the nanoparticles is dissolved and mixed with a proper electron-donor carrying out the reduction process.…”

Section: Composition Of the Vessel Contentmentioning

confidence: 99%

“…The list of capping agent adopted here comprises urea (UR, CO(NH 2 ) 2 , 99%, La Farmochimica, Genova, Italy); tetrabutylammonium bromide (TBAB, (C 4 H 9 ) 4 NBr, 99%, Merck, Milano, Italy); sodium dodecyl sulphate (SDS, CH 3 (CH 2 ) 11 OSO 3 Na, 99%, Sigma-Aldrich, Milano, Italy); N,N-dimethyldodecylamine N-oxide (DDAO, CH 3 (CH 2 ) 11 NO(CH 3 ) 2 , 30% in water, Sigma-Aldrich, Milano, Italy); and three different forms of polyvinyl pyrrolydone (PVP, (C 6 H 9 NO) n , 99%, Sigma-Aldrich, Milano, Italy), with 10 kDa, 40 kDa, and 750 kDa as average molecular weights.…”

Section: Composition Of the Vessel Contentmentioning

confidence: 99%

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Green Synthesis of Silver Nanoparticles by Low-Energy Wet Bead Milling of Metal Spheres

et al. 2019

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A low-energy, magnetically-driven milling technique for the synthesis of silver nanoparticles is proposed, where the grinding medium and the metal precursor consisting of silver spheres have the same shape and size, belonging to a millimetric scale. The process is carried out at room temperature in aqueous solvent, where different types of capping agents have been dissolved to damp particle agglomeration. The particle diameters, determined by dynamic light scattering and transmission electron microscopy, have been compared with those typical of conventional wet-chemical bottom-up synthesis processes. The use of milling spheres and metal precursor of the same initial shape and size allows to overcome some drawbacks and limitations distinctive of conventional bead-milling equipment, generally requiring complex operations of separation and recovery of milling media. The milling bead/nanoparticle diameter ratio obtained by this approach is higher than that typical of most previous wet bead milling techniques. The method described here represents a simple, one-pot, cost-effective, and eco-friendly process for the synthesis of metal nanoparticles starting from a bulky solid.

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Section: Composition Of the Vessel Contentmentioning

confidence: 99%

Section: Composition Of the Vessel Contentmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles by Low-Energy Wet Bead Milling of Metal Spheres

et al. 2019

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“…In recent years, ammonium (NH 4 + ) and manganese (Mn 2+ ) have been common pollutants in surface waters, which have deleterious impacts on drinking water treatment plants as well as posing a severe threat to people's health [1][2][3][4]. Excessive NH 4 + in drinking water is undesirable and may cause numerous problems: (1) NH 4 + contamination can create issues of taste and odor in water as well as eutrophication of surface waters [5][6][7]; (2) NH 4 + not only decreases the efficiency of chlorine disinfection but also leads to the generation of toxic disinfection byproducts [5]; (3) excessive intake of NH 4 + may be oxidized to nitrates (NO 3 − ) and nitrites (NO 2 − ), which can produce carcinogenic nitrosamines [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Alkalinity on Catalytic Activity of Iron–Manganese Co-Oxide in Removing Ammonium and Manganese: Performance and Mechanism

Cheng

Zhang

et al. 2020

IJERPH

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In this study, a pilot-scale experimental filter system was used to investigate the effect of bicarbonate alkalinity on the activity of an Fe–Mn co-oxide for ammonium and manganese removal from surface water. The results showed that an increase in alkalinity to 150 mg/L (calculated as CaCO3) by the addition of NaHCO3 significantly promoted the activity of the Fe–Mn co-oxide. The ammonium and manganese removal efficiencies of the Fe–Mn co-oxide increased from 40% to 95% and 85% to 100%, respectively. After NaHCO3 was no longer added, the activity of the filter column remained. Moreover, pH (7.4–8.0) and temperature (12.0–16.0 °C) were not the main factors affecting the activity of the filter, and had no significant effect on the activity of the filter. Further characterization analysis of the Fe–Mn co-oxide filter film showed that after alkalinity was increased, the accumulation of aluminum on the filter media surface decreased from 3.55% to 0.16% and the oxide functional groups changed. This was due to the action of bicarbonate and the residual aluminum salt coagulant in the filter, which caused the loss of Al from the surface of the filter media and weakened the influence of the aluminum salt coagulant on the activity of the Fe–Mn co-oxide; hence, the activity was recovered.

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“…These outstanding properties allow these materials to offer promising applications in many sustainable processes such as wastewater treatment [7] and petroleum refining [8] as well in agriculture and construction [9]. Over the last decades, many researches have focused on clinoptilolite due to its attractive selectivity for toxic metal cations and organic substances [6,[10][11][12][13][14]. It was reported that the ion-exchange process in natural zeolites depends on factors related to adsorbate and adsorbent characteristics such as pH and temperature of the solution, ion concentration, crystal structure, and chemical composition of the zeolitic material [10,15].…”

Section: Introductionmentioning

confidence: 99%

Sorption of Pb(II) from Aqueous Solutions by Acid-Modified Clinoptilolite-Rich Tuffs with Different Si/Al Ratios

et al. 2019

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The removal of Pb(II) from aqueous solutions by acid-modified clinoptilolite-rich tuff was investigated in this work. Clinoptilolite-rich tuff samples were treated using H2SO4 at different concentrations. Prior to and following acid treatment, the samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and Fourier-transform infrared spectroscopy (FTIR). The pH of the point of zero charge (pHPZC) was also determined as part of this characterization. Batch studies were studied to investigate Pb(II) removal as a function of contact time, initial Pb(II) concentration, adsorbent dosage, and solution pH. The results of the XRD and SEM techniques showed that clinoptilolite is the main mineral of the non- and acid-treated natural zeolite samples. However, EDS analysis indicated that the Si/Al ratio increases as the exchangeable ions decrease with increasing acid concentrations. The optimum conditions for Pb(II) removal for samples with 4.37 ≤ Si/Al ≤ 7.9 were found to be as follows: Contact time of 60–360 min, pH: 6–8, and adsorbent dose of 6 mg g−1; whereas for acid-modified clinoptilolite-rich tuffs with 9.01 ≤ Si/Al ≤ 9.52, these conditions were as follows: Contact time of 1440 min, pH: 8–10, and adsorbent dose of 10 mg g−1. The experimental data were analyzed by kinetic and isotherms models. The results showed that the sorption of Pb(II) on samples with Si/Al ratios of 4.37, 5.31, and 7.91 were in agreement with the pseudo-second order and Langmuir isotherm with qm = 48.54, 37.04, and 14.99 mg g−1, respectively, while the kinetic data and isotherm for samples with 9.01 ≤ Si/Al ≤ 9.52 were found to fit the pseudo-first order and Freundlich model.

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Adsorption of ammonium on clinoptilolite in presence of competing cations: Investigation on groundwater remediation

Cited by 88 publications

References 36 publications

Green Synthesis of Silver Nanoparticles by Low-Energy Wet Bead Milling of Metal Spheres

Green Synthesis of Silver Nanoparticles by Low-Energy Wet Bead Milling of Metal Spheres

Effect of Alkalinity on Catalytic Activity of Iron–Manganese Co-Oxide in Removing Ammonium and Manganese: Performance and Mechanism

Sorption of Pb(II) from Aqueous Solutions by Acid-Modified Clinoptilolite-Rich Tuffs with Different Si/Al Ratios

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