Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 5

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

Search:
in the keywords:  nitrate
help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Publication available in full text mode
Content available

THE INFLUENCE OF THE DEACETYLATION DEGREE OF CHITOSAN IN THE FORM OF FLAKES ON THE EFFECTIVENESS OF NITRATES V SORPTION FROM AQUEOUS SOLUTIONS

100%
Jóźwiak T., Filipkowska U., Bugajska P., Kuczajowska-Zadrożna M., Mielcarek A.
Progress on Chemistry and Application of Chitin and its Derivatives
|
2018
|
vol. 23
88 - 96
EN
The influence of the degree of deacetylation of chitosan from the range of DD = 75–90% on the effectiveness of sorption of nitrates from aqueous solutions was investigated. The scope of the research included: determining the effect of pH on the effectiveness of N-NO3 binding on chitosan sorbents and determining the sorption capacity of chitosan sorbents with different degrees of deacetylation after 5, 15, 30 and 60 minutes. The effectiveness of sorption of nitrates on chitosan sorbents increased in the series DD=75% < DD=85% < DD=90%. Regardless of the degree of deacetylation, the sorption effectiveness of nitrates on chitosan was the highest at pH 4. The amount of nitrate-related sorbents was the highest after 30 min of sorption. A process time which was too long resulted in desorption of nitrates. The maximum sorption capacity for chitosan with the degree of deacetylation DD = 75, 85 and 90% was 0.59 mg N-NO3/g, 0.60 mg N-NO3/g and 0.87 mg N-NO3/g, respectively.
2
Publication available in full text mode
Content available

Assessment of water pollution by nitrates in the Middle Odra Basin

88%
Kolanek A., Korol R., Strońska M., Szyjkowska U., Kolanek A., Korol R., Strońska M., Szyjkowska U.
Journal of Water and Land Development
|
2007
|
issue 11
3
Publication available in full text mode
Content available

Effect of temperature in removing of anions in solution on biochar using Zea mays stalks as a precursor

75%
Villabona-Ortiz Á., Tejada-Tovar C., Ortega-Toro R., Villabona-Ortiz Á., Tejada-Tovar C., Ortega-Toro R.
Journal of Water and Land Development
|
2021
|
issue 50
4
Publication available in full text mode
Content available

Applying of water quality indices methods for assessment of 9-Nissan Water Treatment Plant

75%
Abdul-Hameed H. M., Abdul-Hameed H. M.
Journal of Water and Land Development
|
2020
|
issue 47
5
Content available remote

Adsorption of nitrate from aqueous solution onto modified cassava (Manihot esculenta) straw / Adsorpcja azotanów z roztworu wodnego na zmodyfikowanej słomie manioku Manihot esculenta

63%
Li W., Mo W., Kang C., Zhang M., Meng M., Chen M.
|
|
vol. 19
|
issue 4
629-638
EN
The performance of a new anion exchanger prepared from raw cassava straw (RCS), for the removal of nitrate from aqueous solutions was evaluated in this study. The cassava straw was modified by epichlorohydrin in the presence of pyridine. The influencing factors, adsorption kinetics, and thermodynamics model of nitrate adsorption onto the modified cassava straw (MCS) were studied. The results showed that the zeta potentials of RCS and MCS were -20.5 mV and +37.3 mV, nitrogen contents (N %) of RCS and MCS were 0.43 and 4.96%, respectively. The best nitrate removal results was reached at 0.2 g of adsorbent dosage and pH range of 6.0÷12.0. The modified cassava straw adsorbed nitrate(V) quickly, reaching equilibrium within 30 minutes. The kinetics of nitrate adsorption at different initial concentrations (25, 50 and 75 mg/dm3) all fit a second order reaction. The adsorption rates were controlled by both membrane diffusion and intra-particle diffusion. The adsorption data fit the Freundlich adsorption isotherm and the Langmuir adsorption isotherm. The maximum adsorption capacity was 2.14, 2.00 and 1.81 mmol/dm3 at 293, 303, and 313 K, respectively.
PL
Dokonano oceny wydajności nowego wymieniacza anionowego, wytworzonego ze słomy surowego manioku (RCS), w usuwaniu azotanów z roztworów wodnych. Słomę manioku zmodyfikowano za pomocą epichlorohydryny w obecności pirydyny. Zbadano kinetykę adsorpcji, czynniki wpływające oraz model termodynamiczny adsorpcji azotanów na zmodyfikowanej słomie manioku (MCS). Wyniki pokazały, że potencjały zeta RCS i MCS wynosiły -20,5 mV i +37.3 mV, zawartości azotu (% N) w RCS i MCS wynosiły odpowiednio 0,43 i 4,96%. Najlepsze wyniki usuwania azotanów uzyskano, wykorzystując 0,2 g adsorbentu, w zakresie pH 6,0÷12,0. Zmodyfikowana słoma manioku szybko adsorbowała azotany(V), osiągając stan równowagi po 30 minutach. Kinetyka adsorpcji azotu z roztworów o różnych stężeniach początkowych (25, 50 i 75 mg/dm3) wskazuje na reakcję II rzędu. Szybkość procesu adsorpcji kontrolowała zarówno dyfuzja membranowa, jak i dyfuzja cząsteczkowa. Dane doświadczalne opisano za pomocą modeli izotermy Freundlicha i izotermy Langmuira. Maksymalne pojemności sorpcyjne wynosiły 2,14, 2,00 i 1,81 mmol/dm3 w temperaturach odpowiednio 293, 303 i 313 K.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.