Sensing hazardous metal ions using a fluoroionophore calix[4]arene species containing two 8-oxyquinoline groups

2011 ◽  
Vol 89 (5) ◽  
pp. 562-567 ◽  
Author(s):  
Izilda A. Bagatin ◽  
Koiti Araki ◽  
Henrique E. Toma
Keyword(s):  
Absorption Band ◽  
Optical Absorption ◽  
Metal Ions ◽  
Bathochromic Shift ◽  
Small Decrease ◽  
Hazardous Metal ◽  
Calixarene Ligand

The interaction of a calix[4]arene-based species containing two 8-oxyquinoline chromophore pendants with hazardous metal ions has been investigated using optical absorption and fluorimetric techniques. In the presence of Hg2+, Cd2+, and Pb2+ ions, there is only a small decrease of the calixarene absorption band at 283 nm. The main changes are associated with the absorption band of the 8-oxyquinoline group at 315 nm, undergoing a systematic bathochromic shift to above 350 nm. In addition, a systematic decrease of the oxyquinoline emission at λem = 392 nm (λexc = 315 nm) has been observed. These observations are consistent with the coordination of the metal ions to the quinoline groups attached to the calixarene ligand, providing a useful fluoroinophore species for analytical purposes.

Stabilization of Hazardous Materials into Ferrites

1991 ◽  
Vol 23 (1-3) ◽  
pp. 399-404 ◽  
Author(s):  
Y. Tamaura ◽  
P. Q. Tu ◽  
S. Rojarayanont ◽  
H. Abe
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Present Method ◽  
Hazardous Materials ◽  
Precipitation Process ◽  
Waste Waters ◽  
Formation Reaction ◽  
Coating Method ◽  
Hazardous Metal

Stabilization of the hazardous materials by the Fe3O4-coating method was studied. In the ferrite-formation reaction in the aqueous solution, the adsorption of the metal ions and the oxidation of the adsorbed Fe(II) ions are repeated on the surface of the ferrite particles. This reaction was adopted to the coating of the hazardous materials with the Fe3O4(or ferrite). By repeating the two steps of l)the addition of the Fe(II) aqueous solution into the suspension of the hazardous materials, and 2)the oxidation by passing air through the reaction suspension, with the Fe3O4 layer, we could coat the surfaces of the hazardous materials, such as the heavy metal sludge from the neutralization-precipitation process, the CaF2 precipitates in the treatment of the waste waters containing fluoride ion along with hazardous metal ions, and the soils containing Cd(II) ion. These Fe3O4-coated hazardous materials are very stable and no heavy metal ions are leached under the normal environmental conditions. The ferrite sludges formed in the “Ferrite Process” were highly stabilized by the present method, and by the heat-treatment.

scholarly journals OPTICAL ABSORPTION AND EPR STUDY OF TRANSITION METAL IONS DOPED PHOSPHATE GLASSES

1996 ◽  
Vol 6 (0) ◽  
pp. 241-244 ◽  
Author(s):  
MOHAMED HAOUARI ◽  
HAFEDH BEN OUADA ◽  
HASSEN MAAREF ◽  
HUBERT HOMMEL ◽  
ANDRE PIERRE LEGRAND
Keyword(s):  
Transition Metal ◽  
Optical Absorption ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Phosphate Glasses

Concerning the Optical Absorption Band of the Hydrated Electron

1971 ◽  
Vol 75 (7) ◽  
pp. 634-637 ◽  
Author(s):  
Geraldine Kenney-Wallace ◽  
David C. Walker
Keyword(s):  
Absorption Band ◽  
Optical Absorption ◽  
Hydrated Electron ◽  
Optical Absorption Band

Nejayote biopolyelectrolytes multifunctionality (glucurono ferulauted arabinoxylans) in the separation of hazardous metal ions from industrial wastewater

2021 ◽  
pp. 130210
Author(s):  
Eduardo Alberto López-Maldonado ◽  
Mercedes Teresita Oropeza-Guzmán
Keyword(s):  
Metal Ions ◽  
Industrial Wastewater ◽  
Hazardous Metal

Tailoring the NIR range optical absorption, band-gap narrowing and ferromagnetic response in defect modulated TiO2 nanocrystals by varying the annealing conditions

Vacuum ◽  
2021 ◽  
Vol 184 ◽  
pp. 109955
Author(s):  
V.R. Akshay ◽  
B. Arun ◽  
M. Mukesh ◽  
Anupama Chanda ◽  
M. Vasundhara
Keyword(s):  
Absorption Band ◽  
Optical Absorption ◽  
Band Gap ◽  
Tio2 Nanocrystals ◽  
Optical Absorption Band ◽  
Annealing Conditions ◽  
Band Gap Narrowing

Cellulose Based Electrospun Nanofilters: Perspectives On Tannery Effluent Waste Water Treatment

2021 ◽  
Author(s):  
Senthil Rethinam ◽  
Sardar Batıkan Kavukcu ◽  
Thiagarajan Hemalatha ◽  
A.Wilson Aruni ◽  
Aylin Sendemir
Keyword(s):  
Metal Ions ◽  
Waste Water Treatment ◽  
Toxic Metal ◽  
Poly Vinyl Alcohol ◽  
Tannery Effluent ◽  
Tea Leaves ◽  
Leather Industry ◽  
Elongation At Break ◽  
Hazardous Metal ◽  
Effluent Waste

Abstract Development of nanofilters with the capability to remove toxic metal ions from effluent wastewater will be of immense help to the leather industry. In this study, fibrous nanofilter (FNF) was prepared using micro cellulosic fiber (MCF) and tea leaves microparticles (TLM) blended in poly (vinyl) alcohol (PVA). FNF was analysed for its efficacy to remove hazardous metals from tannery effluent wastewater. The FNF had promising traits of tensile strength (19.24+0.05 Mpa), elongation at break (22.31+0.12 %), flexibility (10.88+0.05 %), water absorption (37.86+0.14 %) and desorption (32.54+0.33 %). The metal adsorption studies clearly reflected the removal of toxic Cr (VI) ions from the effluent water by FNF. The study establishes an economically feasible and highly efficient way to remove hazardous metal ions from effluent wastewater.

L-glutathione capped CdSeS/ZnS quantum dot sensor for the detection of environmentally hazardous metal ions

2019 ◽  
Vol 206 ◽  
pp. 105-112 ◽  
Author(s):  
Meenakshi Rana ◽  
Papia Chowdhury
Keyword(s):  
Quantum Dot ◽  
Metal Ions ◽  
Hazardous Metal

Gamma-Ray Induced 2 eV Optical Absorption Band in Pure-Silica Core Fibers

1988 ◽  
pp. 165-170 ◽  
Author(s):  
Kaya Nagasawa ◽  
Yoshimichi Ohki ◽  
Yoshimasa Hama
Keyword(s):  
Absorption Band ◽  
Optical Absorption ◽  
Gamma Ray ◽  
Optical Absorption Band ◽  
Pure Silica ◽  
Silica Core

scholarly journals Локализованные экситоны в спектре оптического поглощения оксида цинка, легированного марганцем

2019 ◽  
Vol 61 (5) ◽  
pp. 817
Author(s):  
В.И. Соколов ◽  
Н.Б. Груздев ◽  
В.А. Важенин ◽  
А.В. Фокин ◽  
А.В. Дружинин
Keyword(s):  
Zinc Oxide ◽  
Charge Transfer ◽  
Absorption Band ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Polarized Light ◽  
Threshold Energy ◽  
Impurity Absorption ◽  
Charge Transfer Transitions ◽  
Long Time

AbstractThe results of the study of optical absorption and EPR signals of single crystals of zinc oxide doped with manganese are presented. A broad impurity absorption band with the threshold energy about 2.1 eV, which was treated as a result of charge transfer transitions, has been observed for a long time in ZnO : Mn absorption spectra. In absorption spectra of a polarized light at 4.2 and 77.3 K, we first detected several lines of different intensity in a 1.877–1.936 eV range of energies of the light quanta. The observed lines are attributed to a donor exciton [( d ^5 + h ) e ] that emerges as a result of the Coulomb binding a free s electron and a hole, which is localized on p – d hybridized states. The EPR spectra of Mn^2+ ion signals, when corresponding to the impurity absorption band exposed to light, are found to be not photosensitive. The obtained results indicate that the ZnO : Mn impurity absorption is due to transitions from antibonding p – d hybridized DBH states to the conduction band.

scholarly journals Photocatalytic NO removal over calcium-bridged siloxenes under ultraviolet and visible light irradiation

2018 ◽  
Vol 47 (20) ◽  
pp. 7070-7076 ◽  
Author(s):  
Haruo Imagawa ◽  
Xiaoyong Wu ◽  
Hiroshi Itahara ◽  
Shu Yin ◽  
Kazunobu Kojima ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Absorption Band ◽  
Optical Absorption ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Ultraviolet Region ◽  
No Removal ◽  
Optical Absorption Band

Ca-Bridged siloxenes with a wide optical absorption band from the visible to ultraviolet region exhibited photocatalytic activity for NO removal.

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