Study on Biosorption of Uranium by Bacillus subtilis and Saccharomyces uvarum

The paper studied the growth law of Bacillus subtilis and Saccharomyces uvarum, and the interaction between the uranium system and strains in the different concentrations of uranium. The results showed that the B. subtilis almost appeared linear growth when uranium concentration was under the 450 mg/L, and the growth curve of the S.uvarum primarily met the S-growth curve model while uranium concentration was under the 600 mg/L. When the uranium concentration reaching 600 mg/L, the B. subtilis stopped growing, but the S. uvarum grown normally and had no significant difference compared with the control. The adsorption capacity of two strains increased with increasing uranium concentration under the 600 mg/L. While uranium concentration was 450 mg/L, the adsorption rate of two strains reached the maximum value (88.50%). The maximum adsorption capacity of B. subtilis and S. uvarum were 382.86 mgU/g and 113.04 mgU/g, respectively. In the real application, firstly, S. uvarum could be used to decrease the high concentration of uranium, and then B. subtilis was taken for further adsorption to achieve optimal effect of adsorption.

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Adsorption Capacity of Ca2+ by Hydrochloric Acid Activated Kaolin

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/926/1/012082 ◽

2021 ◽

Vol 926 (1) ◽

pp. 012082

Author(s):

N Wahyuni

Keyword(s):

Hydrochloric Acid ◽

Adsorption Capacity ◽

Calcium Ions ◽

Contact Time ◽

Maximum Adsorption Capacity ◽

High Concentration ◽

Straightforward Method ◽

Diamine Tetraacetate ◽

Ca Ions ◽

Time Variations

Abstract A high concentration of calcium ions in water is a problem as it can cause blockages in engine pipes. Adsorption is a relatively cheap and straightforward method that can be used to reduce the calcium ion content in water. Kaolin is a mineral that has a potential as an adsorbent and whose adsorption capacity can be increased by activation. This research studied the adsorption capacity of activated kaolin by hydrochloric acid against Ca2+ ions. Kaolin was chemically activated using 6 M HCl solution for 24 hours. The adsorption contact time in batches was varied with time variations of 30, 90, 150, and 180 minutes. The maximum adsorption capacity of activated kaolin to the Ca2+ was determined by varying the initial concentrations of water samples, namely 4, 7, 10, and 13 mg/L. The concentration of Ca2+ was determined by a titration method using ethylene diamine tetraacetate (EDTA). The results showed that the activation of kaolin with 6 M HCl at the optimum contact time of adsorption, namely 150 minutes, increased the percentage of adsorbed Ca ions to 2 times of that of natural kaolin, from 33.3% to 68.3%. Based on the Langmuir equation, the maximum adsorption capacity of calcium ions by activated kaolin HCl 6 M increased 1.7 times from natural kaolin to 0.346 mg/g.

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Evaluation of advanced phosphorus removal from slaughterhouse wastewater using industrial waste-based adsorbents

Water Science & Technology ◽

10.2166/wst.2021.069 ◽

2021 ◽

Author(s):

Shengdan Sun ◽

Chuanping Feng ◽

Shuang Tong ◽

Yan Zhao ◽

Nan Chen ◽

...

Keyword(s):

Fly Ash ◽

Adsorption Capacity ◽

Steel Slag ◽

Industrial Wastes ◽

Raw Material ◽

Maximum Adsorption Capacity ◽

High Concentration ◽

Slaughterhouse Wastewater ◽

Practical Applications ◽

P Removal

Abstract Slaughterhouse wastewater (SWW) contains high concentration of phosphorus (P) and is considered as a principal industrial contaminant that causes eutrophication. This study developed two kinds of economical P removal adsorbents using flue gas desulfurization gypsum (FGDG) as the main raw material and bentonite, clay, steel slag and fly ash as the additives. The maximum adsorption capacity of the adsorbent composed of 60% FGDG, 20% steel slag, and 20% fly ash (DSGA2) was found to be 15.85 mg P/g, which was 19 times that of the adsorbent synthesized using 60% FGDG, 30% bentonite, and 10% clay (DSGA1) (0.82 mg P/g). Surface adsorption, internal diffusion, and ionic dissolution co-existed in the P removal process. The adsorption capacity of DSGA2 (2.50 mg P/g) was also evaluated in column experiments. The removal efficiency was determined to be higher than 92% in the first 5 days, while the corresponding effluent concentration was lower than the Chinese upcoming SWW discharge limit of 2 mg P/L. Compared with DSGA1, DSGA2 (synthesized from various industrial wastes) showed obvious advantages in improving adsorption capacity of P. The results showed that DSGA2 is a promising adsorbent for the advanced removal of P from SWW in practical applications.

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Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples

Minerals ◽

10.3390/min10090753 ◽

2020 ◽

Vol 10 (9) ◽

pp. 753

Author(s):

Sonja Milićević ◽

Milica Vlahović ◽

Milan Kragović ◽

Sanja Martinović ◽

Vladan Milošević ◽

...

Keyword(s):

Adsorption Capacity ◽

Natural Zeolite ◽

Fixed Bed ◽

Raw Material ◽

Copper Removal ◽

Maximum Adsorption Capacity ◽

High Concentration ◽

Saturation Point ◽

Synthetic Solution ◽

Flow Through

The intent in this paper is to define how the batch equilibrium results of copper removal from a synthetic solution on natural zeolite can be used for prediction of the breakthrough curves in the fixed-bed system for both a synthetic solution and wastewater. Natural zeolite from the Vranjska Banja deposit, Serbia, has been fully characterized (XRD, chemical composition, DTA/TG, SEM/EDS) as a clinoptilolite with cation exchange capacity of 146 meq/100 g. The maximum adsorption capacity (qm) in the batch of the mono-component system (synthetic copper solution) obtained using the Langmuir isotherm model was 7.30 and 6.10 mg/g for particle size below 0.043 and 0.6–0.8 mm, respectively. Using the flow-through system with the 0.6–0.8 mm zeolite fixed-bed, almost double the adsorption capacity (11.2–12.2 mg/g) has been achieved in a saturation point for the copper removal from the synthetic solution, compared to the batch. Better results are attributed to the constant high concentration gradient in flow-through systems compared to the batch. The complex composition of wastewater and large amounts of earth alkaline metals disturb free adsorption sights on the zeolite surface. This results in a less effective adsorption in flow-through systems with adsorption capacity in breakthrough point of 5.84 mg/g (~0.95 × qm) and in a saturation point of 7.10 mg/g (~1.15 × qm).

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ADSORPTION OF URANIUM SIMULATION WASTE USING BENTONITE:TITANIUM DIOXIDE

Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir ◽

10.17146/urania.2019.25.1.4527 ◽

2019 ◽

Vol 25 (1) ◽

Cited By ~ 1

Author(s):

Kris Tri Basuki ◽

Lutfi Aditya Hasnowo ◽

Elza Jamayanti

Keyword(s):

Adsorption Isotherm ◽

Adsorption Capacity ◽

Surface Area ◽

Contact Time ◽

Uranium Concentration ◽

Basal Spacing ◽

Maximum Adsorption Capacity ◽

Clay Material ◽

Order Kinetic ◽

Interlayer Structure

ADSORPTION OF URANIUM SIMULATION WASTE USING BENTONITE TANIUM DIOXIDE. Bentonite is a clay material of high surface area that have galleries within its structure. Bentonite that is modified with TiO2 will have high adsorption capability. In this study, natural bentonite and bentonite:TiO2 were characterized with FTIR, XRD and BET instruments to determine functional group, basal spacing, and specific surface area. This study also investigates the adsorption of bentonite:TiO2 in various environmental factors, such as pH (pH 1, 3, 5, and 8), contact time (10, 20, 30, 40, 50, 60, 70, 90, and 120 min), and initial uranium concentration (20, 40, 60, 80 ppm), and their influences on adsorption capacity, and determine the kinetics equation and adsorption isotherm. Based on FTIR analysis, a decrease in the band of O-H bond from water molecule was observed, which indicates the presence of TiO2 in bentonite interlayer structure. The XRD characterization of bentonite:TiO2 does not show diffraction peak in 001 plane. This is due to delamination of bentonite interlayer structure. Delamination is caused by the presence of TiO2 in large quantities, thus damaging the bentonite interlayer structure into irregular sheets. Bentonite as sheets will cause the basal spacing to increase and it is anticipated that XRD will find it difficult in detecting the 001 plane at a low 2 theta angle. The surface area of bentonite:TiO2 has increased by 12.04 m2/g. The maximum adsorption capacity of U(VI) took place at pH 5.0 for 70 minutes contact time and uranium concentration of 60 ppm. In this study, the adsorption kinetic and adsorption isotherm are pseudo second-order kinetic and Langmuir isotherm. The kinetic constant and maximum adsorption capacity of bentonite:TiO2 are 0.075 g/mg.min and 5.848 mg/g respectively.Keywords: Bentonite, TiO2, Adsorption, Uranium

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RGO/CNF/PANI AS AN EFFECTIVE ADSORBENT FOR THE ADSORPTION OF URANIUM FROM AQUEOUS SOLUTION

Vietnam Journal of Science and Technology ◽

10.15625/2525-2518/56/1a/12500 ◽

2018 ◽

Vol 56 (1A) ◽

pp. 25

Author(s):

Nguyen Quang Dat

Keyword(s):

Aqueous Solution ◽

Adsorption Capacity ◽

Adsorption Process ◽

Uranium Concentration ◽

Maximum Adsorption Capacity ◽

High Adsorption ◽

Order Model ◽

Pani Composite ◽

Reduced Graphene ◽

Pseudo Second Order

In this paper, we present a recent study in the adsorption of uranium from an aquatic environment by reduced graphene oxide - Cu0.5Ni0.5Fe2O4 ferrite – polyaniline (RGO/CNF/PANI) composite. Uranium concentration was carried out by batch techniques. The effect of pH, contact time, concentration of equilibrium state and reusability on uranium adsorption capacity have been studied. The adsorption process was accomplished within 240 min and could be well described by the pseudo-second-order model. The adsorption isotherm agrees well with the Langmuir model, having a maximum adsorption capacity of 2000 mg/g, at pH = 5 and 25 oC. The RGO/CNF/PANI materials could be a promising absorbent for removing U (VI) in aqueous solution because of their high adsorption capacity and convenient magnetic separation.

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Efficiency of Adsorption of Wastewater Containing Uranium by Fly Ash

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.639-640.1295 ◽

2013 ◽

Vol 639-640 ◽

pp. 1295-1299 ◽

Cited By ~ 2

Author(s):

Shi You Li ◽

Shui Bo Xie ◽

Cong Zhao ◽

Ya Ping Zhang ◽

Jin Xiang Liu ◽

...

Keyword(s):

Fly Ash ◽

Adsorption Capacity ◽

Uranium Concentration ◽

Ph Value ◽

Removal Rate ◽

Adsorption Behavior ◽

Maximum Adsorption Capacity ◽

Adsorption Time ◽

Effects Of Ph ◽

Adsorption Quantity

The effects of pH, different initial concentrations of uranium and adsorption time were investigated to study the properties of the sorption of uranium by fly ash. The results show that pH value is the major factor of dominating adsorption rate. The highest adsorption capacity was obtained at pH 5 and the adsorption time was 60 minutes. The increasing of initial uranium concentration resulted in the decreasing of U removal rate and the increasing of adsorption quantity, and the maximum adsorption capacity was 8.38mg/g. The adsorption behavior accorded with both the Freundlich and Langmuir isotherms.

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Synthesis of Lignin-Base Bead Adsorbent and its Application in Removing Pb (II) from Aqueous Solution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.391-392.773 ◽

2011 ◽

Vol 391-392 ◽

pp. 773-777 ◽

Cited By ~ 1

Author(s):

Ya Ling Huang ◽

Ru Lin Fu ◽

Zhen Kun Huang ◽

Xian Su Cheng

Keyword(s):

Electron Microscopy ◽

Aqueous Solution ◽

Adsorption Capacity ◽

Ph Value ◽

Maximum Adsorption Capacity ◽

Condensation Polymerization ◽

High Concentration ◽

Modified Lignin ◽

Scanning Electron ◽

Better Than

A spherical amine modified lignin-base adsorbent had been prepared (L-BAA) by condensation polymerization of lignin with epoxy chloropropane and diamines. The modified products were characterized by FTIR spectra and scanning electron microscopy. Few researches on adsorbing Pb (II) of high concentration from aqueous had been reported. The spherical lignin-base adsorbent was used to adsorb Pb (II) of high concentration from aqueous solution. The effect of shaking time, pH value and temperature on adsorption had been investigated in the study. It was indicated that the adsorption was dependent on pH and temperature of Pb (II) aqueous solution. The maximum adsorption capacity was 151.0 mg/g at follow condition: pH value was 4.00 and temperature was 35°C. The adsorption capacity was better than other reported adsorbents.

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