Physicochemical characterization of in situ drug-polymer nanocomplex formed between zwitterionic drug and ionomeric material in aqueous solution

A novel method for the disassembly of synthetic hydrogels in situ and thereby enhanced adsorption of crystal violet dye is reported. Silicon present in the husk ashes of Panicum miliare is used as the trigger for disassembly of poly(2-acrylamido-1-propane sulfonic acid-co-itaconic acid) hydrogels. Disassembling ability of the ash was determined by changing the temperature of the husk ash. Surface area and particle sizes of both the disassembled and assembled forms of the hydrogels were determined by E. Suito’s method. Removal of crystal violet dye from aqueous solution and the respective adsorption capacities of disassembled and assembled forms of hydrogels were compared by varying parameters such as pH, temperature, and agitation speed. Concentration of the dye in aqueous solution was determined by using UV-Visible spectrophotometer. FTIR analysis was carried out for the characterization of the hydrogels, ash blended hydrogels, and the free ashes. SEM imaging was carried out to differentiate the surfaces of the assembled and disassembled hydrogels.

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Surface Functionalized Halloysite with N-[3-(Trimethoxysilyl)Propyl] Ethylenediamine for Chromium and Nickel Adsorption from Aqueous Solution

Biointerface Research in Applied Chemistry ◽

10.33263/briac126.72057213 ◽

2021 ◽

Vol 12 (6) ◽

pp. 7205-7213

Keyword(s):

Aqueous Solution ◽

Physicochemical Characterization ◽

Surface Functional Groups ◽

Order Model ◽

Adsorption Enthalpy ◽

Batch System ◽

Pseudo Second Order ◽

Nickel Adsorption ◽

Kinetics And Thermodynamic

In this study, -[3-(trimethoxysilyl)propyl] ethylenediamine - modified Indonesian natural halloysite was applied for Cr(III) and Ni(II) adsorption from aqueous solution. The studies include the physicochemical characterization of the synthesized material by using XRD, SEM, gas sorption analyzer, and FTIR analyses. Furthermore, the adsorption experiments were performed at a batch system for investigating the adsorption kinetics and thermodynamic. The results showed no significant changes in either the material crystallinity or specific surface area, but the changes of surface functional groups identified the anchored ammine modifier. Kinetic modeling showed pseudo-second-order model best fitted the experimental data for both adsorbents. Moreover, the thermodynamic studies represented the chemisorption interaction of modified halloysite with the adsorbate since the average adsorption enthalpy values are at 44.3 kJ/mol and 41.70 kJ/mol for Cr(III) and Ni(II), respectively.

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Rheology, dynamic light scattering and physicochemical characterization of octenyl succinic anhydride (OSA) modified starch in aqueous solution

Journal of Food Science and Technology ◽

10.1007/s13197-018-3377-6 ◽

2018 ◽

Vol 55 (11) ◽

pp. 4485-4491 ◽

Cited By ~ 6

Author(s):

Kaouther Ezzeroug ◽

Nadji Moulai-Mostefa ◽

Abdelkader Hadjsadok

Keyword(s):

Aqueous Solution ◽

Light Scattering ◽

Dynamic Light Scattering ◽

Succinic Anhydride ◽

Physicochemical Characterization ◽

Modified Starch ◽

Octenyl Succinic Anhydride

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Characterization of Colombian Clay and Its Potential Use as Adsorbent

The Scientific World JOURNAL ◽

10.1155/2018/5969178 ◽

2018 ◽

Vol 2018 ◽

pp. 1-11 ◽

Cited By ~ 6

Author(s):

Iván Fernando Macías-Quiroga ◽

Gloria Inés Giraldo-Gómez ◽

Nancy Rocío Sanabria-González

Keyword(s):

Aqueous Solution ◽

Physicochemical Characterization ◽

Nitrogen Adsorption ◽

Xrd Analysis ◽

Exchange Capacity ◽

Hexadecyltrimethylammonium Bromide ◽

X Ray Diffraction ◽

X Ray ◽

Removal Of Heavy Metals

This paper presents a mineralogical and physicochemical characterization of a Colombian clay found in an area with the greatest exploitation potential of smectites and possible use as an adsorbent for the removal of chromium. The clay was characterized by using X-ray diffraction (XRD), cation exchange capacity (CEC), X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FT-IR), thermal analysis (TGA/DSC), and nitrogen adsorption at 77 K. The homoionized clay was used as an adsorbent for the removal of Cr(III) in an aqueous solution. The homoionized clay was modified with hexadecyltrimethylammonium bromide (HDTMA-Br), and the organoclay obtained was evaluated for the adsorption of Cr(VI) in aqueous solution. The XRD analysis showed that the clay from Armero-Guayabal is primarily constituted by smectite (48 wt%) followed by quartz mineral (21 wt%). The chemical analysis of bulk clay showed that the predominant oxides are SiO2 (55.81 wt%), Al2O3 (16.25 wt%), and Fe2O3 (7.51 wt%), and the nitrogen adsorption indicated that the bulk clay has a specific surface area of 45.1 m2/g. Homoionized clay and organoclay achieved Cr(III) and Cr(VI) removals greater than 85.05 ± 2.04% (pH between 3 and 4) and 82.93 ± 1.03% (pH between 3 and 5), respectively, proving the potential of these materials for the removal of heavy metals in an aqueous solution.

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