scholarly journals Feasibility Of Metal Biosorption using Gulmohar (Delonix Regia) Tree Leaves Power: Effect of Biosorption Structure on Adsorption Isotherms and Kinetics

2019 ◽  
Vol 8 (4) ◽  
pp. 1527-1531
Keyword(s):  
Tree Leaves ◽  
Sorption Equilibrium ◽  
Efficient Removal ◽  
Biosorption Process ◽  
Metal Biosorption ◽  
Adsorption Isotherms And Kinetics ◽  
Leaf Powder ◽  
Power Effect ◽  
Experimental Values ◽  
Tree Leaf

In this work, biosorption process was commited for expulsion of metals using Gulmohar tree leaf powder since Gulmohar tree leaf powder (GTLP) is a efficient biosorbent for treating Cr(VI) ions. The optimum values observed for efficient removal of Cr(VI) ions were pH-2, concentration for Cr(VI) biosorption by GTLP- 20 ppm and biosorbent dosage-0.1 g. The symmetry was attained at 75 min of acquaintance time. Experimental values were depicted with Freundlich and Langmuir models. Sorption equilibrium exhibited good robust to Langmuir model (R2 = 0.991).

Lead adsorption from aqueous solutions by a granular adsorbent prepared from phoenix tree leaves

RSC Advances ◽  
2016 ◽  
Vol 6 (30) ◽  
pp. 25393-25400 ◽  
Author(s):  
Sha Liang ◽  
Nan Ye ◽  
Yuchen Hu ◽  
Yafei Shi ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Tree Leaves ◽  
Lead Adsorption ◽  
Leaf Powder ◽  
Tree Leaf ◽  
Kinetics And Isotherms ◽  
Granular Adsorbent

In this study, a granular adsorbent was prepared from phoenix tree leaf powder with bentonite as the binder. The adsorption kinetics and isotherms of Pb2+ removal by the 500 °C-calcined granular adsorbent were studied by various models.

QUANTIFICATION OF OIL PALM TREE LEAF PIGMENT (CHLOROPHYLL A) CONCENTRATION BASED ON THEIR AGE

2015 ◽  
Vol 75 (11) ◽  
Author(s):  
Norfazira Mustafa ◽  
Norsuzila Ya’acob ◽  
Zulkiflee Abd Latif ◽  
Azita Laily Yusof
Keyword(s):  
Chlorophyll A ◽  
Oil Palm ◽  
Nutrient Content ◽  
Mature Stage ◽  
Palm Tree ◽  
Tree Leaves ◽  
Chlorophyll A Concentration ◽  
Chlorophyll Pigments ◽  
Different Ages ◽  
Tree Leaf

The main pigments found in oil palm tree leaf are chlorophylls a, b, and c. Chlorophyll a converts light energy into chemical energy through photosynthesis process. The content of chlorophyll pigments varies by their ages. The aim of this research was to determine the concentration in chlorophyll a in different ages. This study is significant in oil palm fertilization for monitoring oil palm nutrient content (NPK). Chlorophyll measurement was done by extracting using methanol solvent and concentration measurement using spectrophotometric method in order to quantify chlorophyll a concentration based on their ages. 6 samples of oil palm tree leaves, collected from 2 different ages, were analyzed. The observed values were determined based on the absorbance at wavelength (670nm) and were calculated for concentrations value based on to the Lambert-Beer law Equation. It showed that the chlorophyll a concentrations at the age of mature stage had been higher than those at the old stage. The results depicted that the chlorophyll a concentration values at the mature stage were 0.33mg/ml, 0.32mg/ml, and 0.18mg/ml, while at the old stage were 0.22 mg/ml, 0.18mg/ml, and 0.06mg/ml.

scholarly journals Efficient Removal of Metals from Synthetic and Real Galvanic Zinc–Containing Effluents by Brewer’s Yeast Saccharomyces cerevisiae

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3624 ◽  
Author(s):  
Inga Zinicovscaia ◽  
Nikita Yushin ◽  
Daler Abdusamadzoda ◽  
Dmitrii Grozdov ◽  
Margarita Shvetsova
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Metal Ions ◽  
High Efficiency ◽  
Zinc Ions ◽  
Brewer’S Yeast ◽  
Yeast Saccharomyces Cerevisiae ◽  
Brewer's Yeast ◽  
Biosorption Process ◽  
Metal Biosorption ◽  
Removal Of Metal Ions

The performance of the brewer’s yeast Saccharomyces cerevisiae to remove metal ions from four batch systems, namely Zn(II), Zn(II)-Sr(II)-Cu(II), Zn(II)-Ni(II)-Cu(II), and Zn(II)-Sr(II)-Cu(II)-Ba(II), and one real effluent was evaluated. Yeast biosorption capacity under different pH, temperature, initial zinc concentration, and contact time was investigated. The optimal pH for removal of metal ions present in the analyzed solution (Zn, Cu, Ni, Sr, and Ba) varied from 3.0 to 6.0. The biosorption process for zinc ions in all systems obeys Langmuir adsorption isotherm, and, in some cases, the Freundlich model was applicable as well. The kinetics of metal ions biosorption was described by pseudo-first-order, pseudo-second-order, and Elovich models. Thermodynamic calculations showed that metal biosorption was a spontaneous process. The two-stage sequential scheme of zinc ions removal from real effluent by the addition of different dosages of new sorbent allowed us to achieve a high efficiency of Zn(II) ions removal from the effluent. FTIR revealed that OH, C=C, C=O, C–H, C–N, and NH groups were the main biosorption sites for metal ions.

scholarly journals Linearized Forms of Langmuir Equations and Its Effect on the Prediction of Biosorption of Cr (VI) on Neem Leaf Powder

2019 ◽  
Vol 8 (4S2) ◽  
pp. 651-654
Keyword(s):  
Experimental Data ◽  
Correlation Coefficient ◽  
Langmuir Isotherm ◽  
Adsorption Equilibrium ◽  
Linearized Equations ◽  
Biosorption Mechanism ◽  
Leaf Powder ◽  
Predicted Values ◽  
Experimental Values ◽  
Isotherm Equations

In order to understand the biosorption mechanism of Cr (VI) on to Neem leaf powder (NLP), the experimental data needs to be fitted onto a linearized form of isotherm equations. The Langmuir isotherm has five different linearized equations, and each form is generating a different constant for adsorption equilibrium based on KL and qmax. The effect of linearized forms of Langmuir isotherms (LL) is studied in this work. KL, qmax was calculated using five different linearized forms of Langmuir isotherm and compared. R2 values of these LL varied drastically between 0.577 to 0.974. From the calculated KL and qmax, qe was predicted and plotted. When these predicted values and experimental values were compared, LL4 was found to be the best suited linearized form despite not having the highest correlation coefficient. The LL2 and LL4 having highest correlation coefficient showed high overshoot for predicted values over experimental values.

scholarly journals Evaluation of Urban Tree Leaf Biomass-Potential, Physico-Mechanical and Chemical Parameters of Raw Material and Solid Biofuel

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 818 ◽  
Author(s):  
Krzysztof Mudryk ◽  
Marcin Jewiarz ◽  
Marek Wróbel ◽  
Marcin Niemiec ◽  
Arkadiusz Dyjakon
Keyword(s):  
Bulk Density ◽  
Urban Areas ◽  
Raw Material ◽  
Leaf Biomass ◽  
Tree Leaves ◽  
Wood Pellets ◽  
Urban Tree ◽  
Solid Biofuels ◽  
Solid Biofuel ◽  
Tree Leaf

The paper presents the results of research aimed at evaluating the possibility of using selected tree leaf species to produce solid biofuels. The possibility of production of qualitative solid biofuels from urban tree leaves meets the expectations of the municipal sector. Collection of tree leaves in urban areas is very often necessary for road safety reasons, the need to collect biomass rich in dust and pollution as well as biomass infested with pests. The production of solid biofuels from tree leaves allows for effective management of this raw material with energy recovery. The performed research indicates such a possibility, and the obtained ash is used as a soil improver. The conducted research showed that the biomass of leaves of five tree species used in the experiment can be a source of raw materials for production of qualitative biofuels. The obtained pellets were characterized by properties comparable to those of classical wood pellets. The lower heating value of the obtained pellets ranged from 14.5 to 15.5 MJ∙kg−1. Physical properties of the obtained pellets described by bulk density (BD 600–660 kg∙m−3), mechanical durability (DU 90–96%), moisture (Mar 10–12.5%) indicate that these products can be used in existing combustion equipment. Preliminary analysis of the obtained ashes (determination of ash melting point, bulk density) indicates that they should not cause difficulties in ash removal systems from the combustion chamber.

scholarly journals Experimental Behavior of Thin-Tile Masonry under Uniaxial Compression: Multi-Leaf Case Study

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2785
Author(s):  
Joan Llorens ◽  
Miquel Àngel Chamorro ◽  
Joan Fontàs ◽  
Manuel Alcalà ◽  
Marc Delgado-Aguilar ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Failure Mode ◽  
Strength Test ◽  
Brick Masonry ◽  
Lateral Buckling ◽  
Strain Behavior ◽  
Compressive Strength Test ◽  
Experimental Values ◽  
Tree Leaf

In this study, experimental analysis on the compressive strength of multi-leaf thin-tile masonry is presented. A compressive strength test was carried out on thin-tile, mortar and 48 specimens with two- and three-leaf thin-tile masonry. The results obtained were compared with literature on brick masonry loaded parallel to a bed joint. Based on the results of this study, the failure mode presented the first crack in the vertical interface; this crack grew until the leaf was detached. From this point until collapse, lateral buckling of the leaves was generally observed. Therefore, the detachment compressive strength value was considered relevant. Up to this point, both masonries exhibit similar stress–strain behavior. The experimental values of the detachment compressive strength were compared with the values calculated from the equation generally used in the literature to evaluate the compressive strength of brick masonry. From the results obtained, the following conclusion can be drawn: This equation is only suitable for tree-leaf thin-tile masonry but with more relevant influence on the compressive strength of the mortar. This study concluded that only three-leaf specimens behave similarly to brick masonry loaded parallel to a bed joint. Finally, whether the failure mode was due to shear or tensile stresses in the vertical thin-tile-mortar interface cannot be identified.

Effect of different conditions on Cu(II) and Cr(VI) biosorption by dried waste tea fungal biomass

2007 ◽  
pp. 149-156 ◽  
Author(s):  
Radojka Razmovski ◽  
Marina Sciban
Keyword(s):  
Heavy Metal ◽  
Ionic Strength ◽  
Metal Ions ◽  
Fungal Biomass ◽  
Heavy Metal Ions ◽  
Efficient Removal ◽  
Biosorption Process ◽  
Salt Ions ◽  
Batch System ◽  
Different Temperatures

Some industrial wastewaters contain high quantities of non-toxic salts besides heavy metal ions. The presence of salt ions leads to a high ionic strength of water, which may significantly affect the performance of the biosorption process, so that the effect of salts on the biosorption of heavy metal ions should be investigated. In this study the effect of different salts concentrations (0.1; 0.5 and 1 mol L-1) and dosage of tea fungal biomass (0.15; 0.25 and 0.5 g L-1) dried at different temperatures: 20?C, 70?C, 80?C, 105?C and 125?C on Cu(II) and Cr(VI) biosorption was studied in a batch system. Biosorption at an ionic strength of 0.1 mol L-1 of all salts investigated had a decreasing effect on Cu(II) and Cr(VI) removal. It was observed that (NH4)2SO4 at the concentrations of 0.5 mol L-1 and 1 mol L-1 was more efficient than other salts for metal ions removal. In case of Cr(VI) the most efficient removal was obtained for the water with K2SO4 at a concentration of 0.5 mol L-1. The lowest biosorbent dosage (0.15 g L-1 tea fungal biomass dried at 20?C in the case of Cu(II) biosorption and at 80?C in the case of Cr(VI) biosorption) resulted in the highest metal uptake of 38 mg g-1 in case of Cu(II) and 33 mg g-1 in case of Cr(VI).

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