scholarly journals Nanoporous Silica Polyamine Composites for Metal Ion Capture From Rice Hull Ash

2010 ◽  
Vol 12 (2) ◽  
pp. 123
Author(s):  
Matt Berlin ◽  
Jesse Allen ◽  
Varadharajan Kailasam ◽  
David Rosenberg ◽  
Edward Rosenberg
Keyword(s):  
Amorphous Silica ◽  
Solid State Nmr ◽  
Metal Ion ◽  
Silica Gels ◽  
Rice Hull ◽  
Nanoporous Silica ◽  
Rice Hull Ash ◽  
Sem Images ◽  
Silica Polyamine Composites ◽  
Nmr Techniques

Rice Hull Ash (RHA) was converted to amorphous silica gel using a modified version of published literature procedures. The gels were characterized by a comparison of their CPMAS [29] Si NMR and Scanning Electron Microscopy (SEM) images with commercial silica gels. The resulting gels were silanized with a 7.5:1 mixture of methyltrichlorosilane and chloropropyltrichlorosilane and then reacted with poly(allylamine) (PAA) to produce the silica polyamine composite (SPC) BP-1. The BP-1 was then further modified with pyridine-2-carboxaldehyde to form the copper selective SPC, CuSELECT. This procedure follows that used to produce the commercialized version of these composite materials from commercially available amorphous silica gels. The composites were characterized by solid state NMR techniques, elemental analysis, SEM, porosimetry, and metal ion capacity and selectivity. The overall goal of the project was to determine the feasibility of using RHA to make SPC. The observed strengths and weaknesses of this approach are discussed.

Nanoporous silica polyamine composites for metal ion capture from rice hull ash

2011 ◽  
Vol 25 (7) ◽  
pp. 530-536 ◽  
Author(s):  
Matt Berlin ◽  
Jesse Allen ◽  
Varadharajan Kailasam ◽  
David Rosenberg ◽  
Edward Rosenberg
Keyword(s):  
Metal Ion ◽  
Rice Hull ◽  
Nanoporous Silica ◽  
Rice Hull Ash ◽  
Silica Polyamine Composites

scholarly journals Adsorption of Ca(II), Mg(II), Zn(II), and Cd(II) on Chitosan Membrane Blended with Rice Hull Ash Silica and Polyethylene Glycol

2018 ◽  
Vol 16 (1) ◽  
pp. 45 ◽  
Author(s):  
F. Widhi Mahatmanti ◽  
Nuryono Nuryono ◽  
Narsito Narsito
Keyword(s):  
Polyethylene Glycol ◽  
Contact Time ◽  
Metal Ion ◽  
Ion Concentration ◽  
Rice Hull ◽  
Rice Hull Ash ◽  
Kinetics Of Adsorption ◽  
Metal Ion Adsorption ◽  
Pseudo Second Order ◽  
Kinetics Of

In this research, chitosan based membrane blended with rice hull ash (RHA) silica and polyethylene glycol (PEG) has been applied as adsorbent of Ca(II), Mg(II), Zn(II) and Cd(II) in an aqueous solution. Membrane was synthesized by blending RHA silica and polyethylene glycol into chitosan. Silica and polyethylene glycol blended into the chitosan to improve the mechanical properties and the membrane porous. The membrane was characterized using Fourier Transform infrared (FTIR) spectroscopy, X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and swelling degree analyzer. Adsorption of metal ions investigated was conducted in a batch system with variation of pH, initial ion concentration and contact time. Thermodynamics and kinetics of adsorption were evaluated based on the adsorption data at initial metal ion concentration and contact time variations, respectively. Results showed that the optimum condition of adsorption was at pH 9.0 for Ca(II), 6.0 for both Mg(II) and Zn(II) and 5.5 for Cd(II), and contact time of 24 h for all ions investigated. Kinetics of all investigated metal ion adsorption followed a kinetic model of pseudo-second-order. Adsorption of Ca(II) and Mg(II) on the membrane fitted to Freundlich model with the affinity of 1.266 and 1.099, respectively; and Zn(II) and Cd(II) fitted to Langmuir one with the capacity of 182 and 106 µmol/g, respectively.

scholarly journals Structural Design of Nanoporous Silica Polyamine Composites for Metal Separations in Water

2016 ◽  
Vol 11 (3) ◽  
pp. 221
Author(s):  
Edward Rosenberg ◽  
Mark Hughes ◽  
Jessica Wood
Keyword(s):  
Structural Design ◽  
Mining Industry ◽  
Silica Gels ◽  
Nanoporous Silica ◽  
The Past ◽  
University Of Montana ◽  
Metal Selectivity ◽  
Silica Polyamine Composites ◽  
The University ◽  
The Relationship

Over the past ten years research at the University of Montana in collaboration with Purity Systems Inc, both located in Missoula, Montana, has resulted in a novel class of chelator materials composed of amorphous, nanoporous silica gels and modified polyamines. These materials offer some distinct advantages over conventional polystyrene based resins especially for applications in the mining industry. This paper will report on the relationship between polymer structure and metal selectivity, the relationship between chelator structure and metal selectivity and further comparisons with polystyrene analogs.

Amorphous Silica from Rice Hull Ash as a Filler Material for Dental Composites

2013 ◽  
Vol 19 (12) ◽  
pp. 3647-3651
Author(s):  
Yeliz Basaran-Elalmis ◽  
Sevil Yucel ◽  
Ismail Aydin ◽  
Bilge Sema Tekerek
Keyword(s):  
Amorphous Silica ◽  
Dental Composites ◽  
Filler Material ◽  
Rice Hull ◽  
Rice Hull Ash

A nano-sized solid acid synthesized from rice hull ash for biodiesel production

RSC Advances ◽  
2014 ◽  
Vol 4 (39) ◽  
pp. 20535-20539 ◽  
Author(s):  
Danlin Zeng ◽  
Shenglan Liu ◽  
Wanjun Gong ◽  
Hongxiang Chen ◽  
Guanghui Wang
Keyword(s):  
Amorphous Silica ◽  
Solid Acid ◽  
Biodiesel Production ◽  
Rice Hull ◽  
Acid Activation ◽  
Rice Hull Ash ◽  
Excellent Activity

A nano-sized solid acid was synthesized from rice hull ash by acid activation. The solid acid is amorphous silica with -OH and -SO3H functional acid groups, and this catalyst exhibits excellent activity and recyclability for biodiesel production.

Water filtration using rice hull ash

Waterlines ◽  
1983 ◽  
Vol 2 (2) ◽  
pp. 21-23 ◽  
Author(s):  
Barnes ◽  
Mampitiyarachichi
Keyword(s):  
Water Filtration ◽  
Rice Hull ◽  
Rice Hull Ash

scholarly journals New Brightener for Zn-Fe Alloy Plating from Sulphate Bath

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
B. M. Praveen ◽  
T. V. Venkatesha
Keyword(s):  
Grain Size ◽  
Metal Ion ◽  
Condensation Product ◽  
Spectroscopic Studies ◽  
Sem Images ◽  
Alloy Electrodeposition ◽  
Fine Grained ◽  
Polarization Studies ◽  
Uv Visible ◽  
Sulphate Bath

Zn-Fe alloy electrodeposition was carried out in the presence of condensation product 2-{[(1E)-(3,4-dimethoxyphenyl)methylidene]amino}-3-hydroxypropanoic acid formed between veratraldehyde and serine in acid sulphate bath. Hull cell was used for optimizing the operating parameters and bath constituents. During deposition, the potential was shifted towards cathodic direction in the presence of addition agents and brightener. The polarization studies show that deposition taking place in basic bath and optimum bath was 1.08 and 1.15 V, respectively. Current efficiency and throwing power were reached around 85% and 26%, respectively. The SEM images of bright deposit indicated its fine-grained nature and appreciable reduction in the grain size. XRD studies have showed that the grain size of the deposit generated from optimum bath was 16 nm. UV-visible spectroscopic studies confirm the formation of complex between metal ion and brightener.

scholarly journals Solid Reactant-Based Geopolymers from Rice Hull Ash and Sodium Aluminate

2016 ◽  
Vol 8 (6) ◽  
pp. 2131-2140 ◽  
Author(s):  
Ailar Hajimohammadi ◽  
Jannie S. J. van Deventer
Keyword(s):  
Sodium Aluminate ◽  
Rice Hull ◽  
Rice Hull Ash ◽  
Solid Reactant

ChemInform Abstract: Solid-State NMR Techniques in Oriented Systems

ChemInform ◽  
2010 ◽  
Vol 23 (43) ◽  
pp. no-no
Author(s):  
K. V. RAMANATHAN ◽  
B. S. ARUNKUMAR ◽  
N. SURYAPRAKASH ◽  
R. PRATIMA ◽  
C. L. KHETRAPAL
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Techniques

Benzene Adsorption on Nanoporous Silica Gels with Grafted Polyfluoroalkyl Layers and the Wettability

2021 ◽  
Vol 95 (4) ◽  
pp. 775-785
Author(s):  
T. M. Roshchina ◽  
N. K. Shoniya ◽  
O. P. Tkachenko ◽  
L. M. Kustov
Keyword(s):  
Silica Gels ◽  
Nanoporous Silica ◽  
Benzene Adsorption
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