Wyniki wyszukiwania - Biblioteka Nauki

1

Removal of methylene blue from aqueous solutions with natural olive pomace modified with ultrasounds and acid

100%

Kalipci E.

Environment Protection Engineering

|

2016

|

tom Vol. 42, nr 3

5--17

EN

Removal of methylene blue (MB) from aqueous solution by raw olive pomace (ROP) which is a waste of industrial olive oil and olive pomace modified with ultrasounds and acid (MOP) has been investigated. It was found that the data for ROP and MOP were well fit to the Freundlich isotherm model (R2 equal to 0.864 and 0.834, respectively). As a result; it was determined that raw olive pomace can be used for the removal of methylene blue dye (KF = 10.08 mg/g(dm3/mg)1/n) and modified olive pomace had high adsorption capacity for MB (KF = 73.08 mg/g(dm3/mg)1/n).

2

Zależność sorpcji pestycydów fenoksyoctowych na węglu AG-5 od ich własności fizyczno-chemicznych

100%

Ignatowicz-Owsieniuk K.

|

2001

|

tom Z. 14

45-54

PL

W opracowaniu przedstawiono wyniki badań dotyczących usuwania herbicydów fenoksyoctowych z wody na węglu AG-5 metodą sorpcji. Doświadczenia miały na celu ustalenie stopnia eliminowania związku w zależności od budowy tego związku i jego własności fizyczno-chemicznych. Wyniki przedstawiono za pomocą izoterm i równań adsorpcji Freundlicha. Stężenie równowagowe pestycydu oznaczano metodami chromatograficznymi - TLC i HPLC.

EN

The purpose of the project was to assess the efficiency of removal of phenoxyacetic pesticides from water by means of activated carbon sorption. The sorbents AG-5 used in this research were domestic products. It was produced by GRYFSKAND, Ltd., Hajnowka. The static research was conducted according to the Chemviron Carbon methodology. Its aim was to determine the Freundlich isotherm and sorption capacity. The residual concentration of the contaminant in the filtrate was determined by the relevant analytical techniques. Also the concentration of phenoxyacetic acid was identified by TLC and HPLC methods.

3

Removal of Ni(II) ions from aqueous solutions using manganese oxide nanoparticles from buffelgrass, Cenchrus ciliaris L., as green adsorbent. Kinetics and thermodynamic studies

84%

Kiruba D. A. , Muthukumaran K. , Thamarai P.

Environment Protection Engineering

|

2022

|

tom Vol. 48, nr 1

135--149

EN

Manganese oxide nanoparticles (MnONPs) synthesized from buffelgrass, Cenchrus ciliaris (L.), an invasive weed posing threats to ecosystems, are used in this study to remove nickel(II) ions from aqueous solutions. As a biosorbent, the synthesized MnONPs were put to the test. MnONPs were studied for their surface morphology and functional properties. A variety of adsorbent dosages and contact times were tested in batch experiments to see how they affected adsorption rates. At pH 6.0 and room temperature, MnONPs had an 87.1% removal efficiency for Ni(II) ions. Pseudo-second order correlations had a higher R2 value (0.988). In the Langmuir plot, a maximum adsorption capacity of 4.78 mg/g was observed. However, the experimental data fitted well with both Langmuir and Freundlich isotherm models (R2 = 0.99). Spontaneous and exothermic was the nature of the adsorption process. To remove heavy metal ions contaminants from aqueous solutions, these results suggested that MnONPs synthesized from buffelgrass extract could be used.

4

Statyczne badania adsorpcji wybranych substancji wskaźnikowych zanieczyszczeń organicznych wody na granulowanych węglach aktywnych

67%

Lulek J. , Grochmalicka-Mikolajczyk J.

Bromatologia i Chemia Toksykologiczna

|

1987

|

tom 20

|

nr 2

5

Sorption process of Acid Yellow 36 on sludge-based activated carbon

67%

Pieczykolan B. , Płonka I.

|

tom Vol. 10, No. 1

67--73

EN

The study of sorption of dye Acid Yellow 36 on SAC (sludge-based activated carbon) was conducted. For this purpose, anaerobically digested and dewatered sewage sludge was dried at 105ºC to constant weight. Next this sludge was milled to a particle with a diameter of 0.5-1.0 mm and subjected to chemical activation by hydrogen peroxide. After oxidation process the sludge was subjected to thermal transformation in a muffle furnace at 600ºC. In this way obtained a powder activated carbon based on activated sludge (so-called SAC). Based on the results of the study the most favorable parameters of sorption process was achieved as follows: pH value equaled to 2.5 and reaction time equaled to 30 minutes. The linearized forms of Freundlich and Langmuir isotherms showed that the highest value of correlation factor was obtained in the case of Langmuir model. However, in this case, the negative value of constant isotherm was achieved. Therefore, it can be assumed that more accurately in this case is the Freundlich model or other model which was not examined during that studies.

PL

Przeprowadzono badania sorpcji barwnika Acid Yellow 36 z użyciem węgla aktywnego bazującego na osadzie ściekowym. W tym celu ustabilizowany beztlenowo i odwodniony osad czynny wysuszono w 105ºC do stałej masy. Następnie osad ten zmielono do ziaren o średnicy 0,5-1,0 mm i poddano chemicznej aktywacji za pomocą nadtlenku wodoru. Po tym procesie osad spalono w piecu muflowym w 600ºC, uzyskując w ten sposób pylisty węgiel aktywny bazujący na osadzie czynnym (tzw. SAC - czyli „sludge-based activated carbon”). Dla tak spreparowanego węgla aktywnego przeprowadzono badania procesu sorpcji statycznej względem barwnika Acid Yellow 36. Na podstawie przeprowadzonych eksperymentów stwierdzono, że najkorzystniejsza wartość pH wynosi 2,5, a czas kontaktu jest równy 30 minut. Natomiast bazując na graficznych formach zlinearyzowanych modelów sorpcji według Langmuira i Freundlicha, stwierdzono, że największą wartość współczynnika korelacji odnotowano w przypadku zlinearyzowanej formy równania Langmuira. Jednakże w tym przypadku uzyskano ujemne wartości stałych izotermy, dlatego można przypuszczać, że jednak bardziej prawidłowy jest model Freundlicha lub inny rodzaj izotermy, który nie był analizowany w toku tych badań.

6

Utilization of agricultural and industrial wastes for metal removal from aqueous solutions

67%

Biegańska M. , Cierpiszewski R.

Polish Journal of Chemical Technology

|

2011

|

tom Vol. 13, nr 1

20-22

EN

In this study a possibility of obtaining sorbents from basketry wastes has been investigated. Therefore, adsorption of cadmium ions on wicker bark of Salix americana has been studied. The obtained experimental results were described by the Freundlich equation and adsorption kinetics by the pseudo-second order equation. The effect of pH on cadmium ions adsorption by S. americana was also investigated. It has been found that for the pH values ranging from 2 to 7 cadmium removal from the solution was held at almost constant level.