scholarly journals CHARACTERIZATION AND ADSORPTION CAPACITY OF AMINE-SIO2 MATERIAL FOR NITRATE AND PHOSPHATE REMOVAL

2019 ◽  
Vol 57 (4) ◽  
pp. 492
Author(s):  
Phan Phuoc Toan ◽  
Nguyen Trung Thanh ◽  
Nguyen Nhat Huy ◽  
Le Ngoc Hang ◽  
Le Tri Thich
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Stable Performance ◽  
Regeneration Times ◽  
Sem Analyses

Amine-SiO2 material was synthesized and applied as a novel adsorbent for nitrate and phosphate removal from aqueous solution. The characterization of Amine-SiO2 were done by using TGA, FTIR, BET, and SEM analyses. Results showed that Amine-SiO2 had higher nitrate and phosphate adsorption capacity of 1.14 and 4.16 times, respectively, than commercial anion exchange resin (Akualite A420). In addition, Amine-SiO2 also had good durability with stable performance after at least 10 regeneration times, indicating that this material is very promising for commercialization in the future as an adsorbent for water treatment.

scholarly journals Characterizations and nitrate adsorption capacity of Amine-SiO2 material

2019 ◽  
Vol 2 (5) ◽  
pp. 171-176
Author(s):  
Thanh Trung Nguyen ◽  
Toan Phuoc Phan ◽  
Hang Ngoc Le ◽  
Sang Hoang Phan ◽  
Trinh Thi Thu Nguyen ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Nitrate Removal ◽  
Ion Exchange Resin ◽  
Nitrate Adsorption ◽  
Stable Performance ◽  
Amine Groups ◽  
Regeneration Times ◽  
Sio2 Support

Amine-SiO2 material (basically on silicon dioxide) was synthesized by the grafting method with triamine silane to form activated amine groups on the surface of SiO2 support and was applied as a novel adsorbent for nitrate removal from aqueous solution. The characterizations of Amine-SiO2 were determined by using TGA, FTIR, BET, SEM. Nitrate adsorption capacity and durability of Amine-SiO2 were compared with the anion exchange resin (Akualite A420 commercial). The results showed that Amine-SiO2 had high nitrate adsorption capacity, ~ 1.14 fold higher than the Akualite A420 ion exchange resin, based on the adsorption efficiency. This might be due to a strong affinity for nitrate ions of the activated amine groups on the surface of SiO2 support. In addition, the experimental results also proved that Amine-SiO2 material had good durability (stable performance after 10 regeneration times).

scholarly journals Study of phosphate removal from aqueous solution by zinc oxide

2015 ◽  
Vol 13 (3) ◽  
pp. 704-713 ◽  
Author(s):  
Zhen Luo ◽  
Suiyi Zhu ◽  
Zhongmou Liu ◽  
Jiancong Liu ◽  
Mingxin Huo ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Zinc Oxide ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Chloride Ions ◽  
Phosphate Removal ◽  
Point Of Zero Charge ◽  
Phosphate Adsorption ◽  
Solution Ph ◽  
Base Interaction

Zinc oxide (ZnO) was synthesized and used to investigate the mechanism of phosphate removal from aqueous solution. ZnO particles were characterized by X-ray diffraction, scanning electron microscope and Fourier transform infrared spectroscopy before and after adsorption. Batch experiments were carried out to investigate the kinetics, isotherms, effects of initial pH and co-existing anions. The adsorption process was rapid and equilibrium was almost reached within 150 min. The adsorption kinetics were described well by a pseudo-second-order equation, and the maximum phosphate adsorption capacity was 163.4 mg/g at 298 K and pH ∼6.2 ± 0.1. Thermodynamic analysis indicated the phosphate adsorption onto ZnO was endothermic and spontaneous. The point of zero charge of ZnO was around 8.4 according to the pH-drift method. Phosphate adsorption capacity reduced with the increasing initial solution pH values. The ligand exchange and Lewis acid-base interaction dominated the adsorption process in the lower and the higher pH range, respectively. Nitrate, sulfate and chloride ions had a negligible effect on phosphate removal, while carbonate displayed significant inhibition behavior.

Role of iron oxidation byproducts in the removal of phosphate from aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 1627-1636 ◽  
Author(s):  
Nathalie Sleiman ◽  
Véronique Deluchat ◽  
Mahmoud Wazne ◽  
Alexandra Courtin ◽  
Zeinab Saad ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Dissolved Oxygen ◽  
Adsorption Capacity ◽  
Iron Oxidation ◽  
Synthesis And Characterization ◽  
Phosphate Adsorption ◽  
Dissolved Oxygen Concentration ◽  
Experimental Conditions

Synthesis and characterization of iron oxidation byproducts, in different experimental conditions (aging and dissolved oxygen concentration); study of their phosphate adsorption capacity.

scholarly journals Study about Doping Ion La3+ onto Surface of Pyrolusite Ore for Removing Simultaneously Both Fluoride and Phosphate from Wastewater

2017 ◽  
Vol 2017 ◽  
pp. 1-11
Author(s):  
Nguyen Thi Hue ◽  
Nguyen Hoang Tung
Keyword(s):  
Aqueous Solution ◽  
Kinetic Studies ◽  
Phosphate Adsorption ◽  
Fluoride Removal ◽  
Fluoride Adsorption ◽  
Pseudo Second Order ◽  
Xrd Techniques ◽  
Adsorbent Characterization ◽  
Coexisting Ions

Lanthanum has been doped onto the surface of the natural Pyrolusite for simultaneous removal of phosphate and fluoride in aqueous solution. The adsorbent characterization of the materials was observed by the SEM, BET, and XRD techniques. The dynamics and isotherms models of fluoride and phosphate adsorption, with respect to pH, pHPZC, adsorbent dose, and effect of coexisting ions, were studied. The results showed that lanthanum doped Pyrolusite ore (LDPO) relatively highly adsorbed amount of phosphate and fluoride from aqueous solution. Phosphate and fluoride removal efficiencies of LDPO are approximately 97% and 95%, respectively. Pseudo-first order for kinetic studies of phosphate and fluoride removal of the LDPO was observed with high correlations for fluoride but weak correlations for phosphate. However, pseudo-second order for kinetic studies was high correlation for both phosphate and fluoride. The phosphate and fluoride adsorption capacities of the LDPO significantly decreased with the existence of coions (sulfate, chloride, and nitrate) in the aqueous solution.

A simple method of polyamine purification

1985 ◽  
Vol 38 (4) ◽  
pp. 633 ◽  
Author(s):  
IW Stapleton
Keyword(s):  
Aqueous Solution ◽  
Anion Exchange ◽  
Large Scale ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Simple Procedure ◽  
Crystalline Solid ◽  
Simple Method

A simple procedure for the large-scale purification of commercial polyethyleneamines (H2N[CH2CH2NH]nH where n = 2-5) is described in which the per- tosylate salt separates as a crystalline solid from aqueous solution. The salts require no further purification except for pentaethylenehexamine (n = 5), which requires recrystallization from water. The free bases are regenerated from the tosylate salt by an anion-exchange resin.

scholarly journals The Synthesis and Effect of Silver Nanoparticles on the Adsorption of Cu2+ from Aqueous Solutions

2020 ◽  
Vol 10 (14) ◽  
pp. 4840
Author(s):  
Ghadah M. Al-Senani ◽  
Nada Al-Kadhi
Keyword(s):  
Aqueous Solution ◽  
Freundlich Isotherm ◽  
Spherical Particles ◽  
Convolvulus Arvensis ◽  
X Ray ◽  
Nanoparticle Surface ◽  
Before And After ◽  
Adsorption Processes ◽  
Sem Analyses

The adsorption of Cu2+ ions from an aqueous solution using AgNPs synthesized from Convolvulus arvensis leaf extract was investigated. The characterization of AgNPs was investigated before and after the adsorption of Cu2+ ions via Fourier-transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM) analyses. The adsorbent contained various functional groups in addition to the AgNPs, which contributed to the Cu2+ ions adsorption. The silver nanoparticle surface consisted of spherical particles and deep pores, which adsorbed numerous Cu2+ ions. The influences of dosage, pH, and contact time on adsorption of 10 and 50 mg/L Cu2+ at 298 K, and initial Cu2+ concentrations at 298 and 323 K were studied. It was found that the highest percentage of Cu2+ ions adsorbed from an aqueous solution was 98.99%; the aqueous solution had 10 mg/L of Cu2+ ions and 0.2 g of AgNPs, at pH 12 and 298 K. A pseudo-second kinetics model offered the most accurate description of the process of adsorption. The process of Cu2+ adsorption more resembled a Langmuir rather than a Freundlich isotherm model, including chemical and physical mixed adsorption (mixed adsorption) processes, and was exothermic and spontaneous.

Characterization of phosphate removal from aqueous solution by manganese oxyhydroxyde

2017 ◽  
pp. 274-279
Author(s):  
Loubna Bouhouf ◽  
Chahrazed Boukhalfa ◽  
Laurence Reinert ◽  
Laurent Duclaux
Keyword(s):  
Aqueous Solution ◽  
Phosphate Removal

Synthesis and characterization of Tris[(S)-1-dithiocarboxypyrrolidine-2-carboxylato(2 -)-S,S']cobalt(III), a complex derived from the (S)-proline residue

1981 ◽  
Vol 34 (10) ◽  
pp. 2039 ◽  
Author(s):  
T Woon ◽  
MJ O'Conner
Keyword(s):  
Ammonium Salt ◽  
Exchange Resin ◽  
Geometrical Structure ◽  
Complex Anion ◽  
Anion Exchange Resin ◽  
Cobalt Atom ◽  
Protonated Form ◽  
Asymmetric Carbon Atom ◽  
Asymmetric Carbon

The ammonium salt of (S)-1-dithiocarboxypyrrolidine-2-carboxyic acid and its tris-chelated cobalt(III) complex have been prepared and characterized. The ammonium salt of the complex anion is soluble in water whereas the fully protonated form is soluble in some organic solvents. These diamagnetic cobalt(III) compounds and the corresponding neutral methyl ester complex are shown by 13C n.m.r. spectroscopy to have the facial geometrical structure. The complex anion was successfully separated into diastereomeric Δ(SSS) and λ(SSS) forms (S refers to the asymmetric carbon atom in each of the proline moieties) by using Sephadex DEAE anion-exchange resin with aqueous ammonium chloride eluent. The more easily eluted species has the Δ absolute configuration at the dissymmetric cobalt atom as assigned from its circular dichroism spectrum.

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