Heterogeneous Fenton-like degradation of ofloxacin over a wide pH range of 3.6–10.0 over modified mesoporous iron oxide

2017 ◽  
Vol 328 ◽  
pp. 397-405 ◽  
Author(s):  
Xike Tian ◽  
Hang Jin ◽  
Yulun Nie ◽  
Zhaoxin Zhou ◽  
Chao Yang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Heterogeneous Fenton ◽  
Wide Ph Range ◽  
Ph Range

High degradation efficiency of sulfamethazine with the dual-reaction-center Fe-Mn-SiO2 Fenton-like nanocatalyst in a wide pH range

2021 ◽  
Author(s):  
Manoj Kumar Panjwani ◽  
Qing Wang ◽  
Yueming Ma ◽  
Yuxuan Lin ◽  
Feng Xiao ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Reaction Center ◽  
Degradation Efficiency ◽  
Heterogeneous Fenton ◽  
Wide Ph Range ◽  
Ph Range

The development of a heterogeneous Fenton-like catalyst, possessing high degradation efficiency in a wide pH range, is crucial for wastewater treatment. The Fe-Mn-SiO2 catalyst was designed, and prepared by a...

scholarly journals Synthesis of water-soluble chitosan for biomedical applications

2015 ◽  
Vol 18 (3) ◽  
pp. 170-180
Author(s):  
Anh Thi Tram Tu ◽  
Huy Thuc Ha
Keyword(s):  
Drug Delivery ◽  
Molecular Weight ◽  
Iron Oxide ◽  
Biomedical Applications ◽  
Drug Delivery Systems ◽  
Water Soluble ◽  
Oxide Nanoparticles ◽  
Wide Ph Range ◽  
Ft Ir ◽  
Ph Range

Highly deacetylated chitosan (CS) reacted with anhydride acetic (Ac2O) to produce chitosan with various degree of deacetylation (DDA) depending on the CS/Ac2O ratios. The structure of products was characterized by FT-IR, 1H NMR, 13C NMR, and the molecular weight was identified by GPC. The DDA of products decreases as the CS/Ac2O ratio increases. The products with less than 80 % DDA were soluble in water with a wide pH range. The water-soluble chitosan can be used in many biomedical applications such as manufacturing drug delivery systems or functionalized iron oxide nanoparticles.

Removing dye Rhodamine B from aqueous medium via wet peroxidation with V-MCM-41 and H2O2

2009 ◽  
Vol 59 (3) ◽  
pp. 565-571 ◽  
Author(s):  
Deyong Wu ◽  
Mingce Long ◽  
Chao Chen ◽  
Yahui Wu ◽  
Weimin Cai ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Mesoporous Structure ◽  
Heterogeneous Fenton ◽  
Bet Method ◽  
Wide Ph Range ◽  
Ph Range ◽  
Tetraethyl Silicate ◽  
Mcm 41

A new heterogeneous Fenton-like system, consisting of V-MCM-41 catalyst and hydrogen peroxide, was proved to be effective in removing recalcitrant dye Rhodamine B (RhB) in aqueous solutions. V-MCM-41 was prepared following a direct hydrothermal procedure with tetraethyl silicate and ammonium metavanadate as precursor. The mesoporous structure has been characterized by XRD, and the specific surface area was determined as x m2 g−1 according to BET method. The catalytic reaction can proceed in a relatively wide pH range from acidic to alkaline. And the visible light irradiation cannot promote the reaction process. In addition, the mechanism implication for V-MCM-41 as a Fenton-like catalyst has been discussed.

scholarly journals Surfactant free superparamagnetic iron oxide nanoparticles for stable ferrofluids in physiological solutions

2015 ◽  
Vol 51 (14) ◽  
pp. 2863-2866 ◽  
Author(s):  
K. Mandel ◽  
M. Straßer ◽  
T. Granath ◽  
S. Dembski ◽  
G. Sextl
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Superparamagnetic Iron Oxide ◽  
Silica Shell ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Wide Ph Range ◽  
Ph Range

Ferrofluids of superparamagnetic Fe3O4 nanoparticles with “patchy” silica shell are stable over a wide pH range and in physiological solutions.

Polarographic and spectrophotometric behaviour of some N-p-phenyl substituted benzamidines

1991 ◽  
Vol 56 (12) ◽  
pp. 2791-2799 ◽  
Author(s):  
Juan A. Squella ◽  
Luis J. Nuñez-Vergara ◽  
Hernan Rodríguez ◽  
Amelia Márquez ◽  
Jose M. Rodríguez-Mellado ◽  
...  
Keyword(s):  
Spectrophotometric Study ◽  
Absorption Bands ◽  
Electrochemical Parameters ◽  
Wide Ph Range ◽  
Group A ◽  
Substituent Constants ◽  
Ph Range ◽  
The Waves

Five N-p-phenyl substituted benzamidines were studied by DC and DP polarography in a wide pH range. Coulometric results show that the overall processes are four-electron reductions. Logarithmic analysis of the waves indicate that the process are irreversible. The influence of the pH on the polarographic parameters was also studied. A UV spectrophotometric study was performed in the pH range 2-13. In basic media some variations in the absorption bands were observed due to the dissociation of the amidine group. A determination of the pK values was made by deconvolution of the spectra. Correlations of both the electrochemical parameters and spectrophotometric pK values with the Hammett substituent constants were obtained.

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