160 research outputs found
Investigation of metal ions sorption of brown peat moss powder
For regularities research of sorptive extraction of heavy metal ions by cellulose and its derivates from aquatic solution of electrolytes it is necessary to find possible mechanism of sorption process and to choice a model describing this process. The present article investigates the regularities of aliovalent metals sorption on brown peat moss powder. The results show that sorption isotherm of Al3+ ions is described by Freundlich isotherm and sorption isotherms of Na+ и Ni2+ are described by Langmuir isotherm. To identify the mechanisms of brown peat moss powder sorption the IR-spectra of the initial brown peat moss powder samples and brown peat moss powder samples after Ni (II) sorption were studied. Metal ion binding mechanisms by brown peat moss powder points to ion exchange, physical adsorption, and complex formation with hydroxyl and carboxyl groups
CELLULAR LOCALIZATION OF IMMUNOGLOBULINS WITH DIFFERENT ALLOTYPIC SPECIFICITIES IN RABBIT LYMPHOID TISSUES
Адсорбционная активность сырья водно-болотных растений Западной Сибири
In order to find effective sorbents of herbal origin, we’ve studied adsorption properties of aerial dry raw materials of 31 marsh-water, medical perspective, plant species. It was found that 8 of those 31 exercises adsorption activity (Shpagnum species).С целью поиска эффективных сорбентов растительного происхождения изучены адсорбционные свойства сухого сырья 31 вида широко распространенных в Западной Сибири водно-болотных растений. Для 8 из них установлены выраженные адсорбционные свойства (мхи рода сфагнум), что позволяет отнести их к числу перспективных видов для получения эффективных сорбентов
Päikesepatareides kasutatavate ZnO nanovarraste läbilaskvusomadused
Bachelor’s thesis
Curriculum in EngineeringThe study of the transmittance and absorbance properties of a material in the design of
solar cells is of significant importance. The transmittance of a material determines the
ability of light to pass through it. Whereas, the absorbance of a material determines its
ability to absorb light. ZnO nanostructures are a good choice for such properties as several
studies have shown that ZnO nanostructures show high transmittance (~80%). Also, ZnO
nanostructures can absorb most of the UV region of light coming from the sun. In this
thesis, the transmittance and absorbance properties of four different types of ZnO nanorod
samples were investigated, each of which was prepared with different solvents. The
solvents used are ethanol, 70% ethanol, methanol, and isopropanol. A UV-1600PC
spectrophotometer was used for measuring the transmittance and absorbance of ZnO
nanorod samples. Two types of reference materials were used for the measurements. The
results obtained based on the transmittance and absorbance measurements are analysed
and compared. Finally, the bandgaps for each of the synthesized nanorods were calculated
by using the Tauc relation, and the optimal ZnO nanorod sample for solar cell applications
was discussed.Materjali läbilaskvuse ja neeldumisvõime omaduste uurimine on päikesepatareide
projekteerimisel väga oluline. Materjali läbilaskvus määrab valguse läbilaskvuse läbi
materjali. Materjali neelduvus määrab, kui palju valgust materjal suudab neelata.
ZnO nanostruktuurid on selliste omaduste poolest hea valik, sest mitmed uuringud
on näidanud, et ZnO nanostruktuuridel on kõrge läbilaskvus (~80%). Samuti
suudavad ZnO nanostruktuurid absorbeerida enamiku päikesest tuleva valguse UVkiirguse piirkonnast. Käesolevas lõputöös uuriti nelja erineva ZnO nanostruktuuride
proovi läbilaskvus ja neeldumisomadusi, millest igaüks valmistati erinevate lahustite
abil. Kasutatud lahustid on etanool, 70% etanool, metanool ja isopropanool. ZnO
nanovarraste proovide läbilaskvuse ja neelduvuse mõõtmiseks kasutati UV-1600PC
spektrofotomeetrit. Mõõtmistes kasutati kahte tüüpi võrdlusmaterjale. Analüüsitakse
ja võrreldakse läbilaskvuse ja neelduvuse mõõtmiste põhjal saadud tulemusi.
Viimasena arvutati iga sünteesitud nanovarda ribalõhed Tauci suhte abil ja toodi välja
ZnO nanovarraste parem valik päikesepatareide kasutamiseks
- …