scholarly journals Potassium Recovery from Potassium Solution and Seawater Using Different Adsorbents

2021 ◽  
Vol 11 (18) ◽  
pp. 8660
Author(s):  
Sora Shin ◽  
EunHea Jho ◽  
HyunJu Park ◽  
Sungjong Lee ◽  
JoonHa Kim
Keyword(s):  
Sorption Capacity ◽  
Natural Zeolite ◽  
Ammonium Acetate ◽  
Manganese Nodule ◽  
Freundlich Isotherm ◽  
Significant Loss ◽  
Seawater Samples ◽  
Surface Modified ◽  
Neutral Conditions ◽  
Better Than

The potassium (K) sorption characteristics with three adsorbents, natural zeolite, ammonium acetate-treated zeolite, and manganese nodule, were studied and compared to see the potential use of manganese nodule as an alternative K adsorbent. In general, the Langmuir isotherm could fit the K sorption in the KCl solutions at different pH conditions better than the Freundlich isotherm. Based on the Langmuir parameters, the maximum K sorption was greater for the zeolite-based adsorbents (i.e., 40–42 mg g−1) than the manganese nodule (i.e., 2.0 mg g−1) at acidic conditions, while the manganese nodule (i.e., 9.7 mg g−1) showed better K sorption at neutral conditions. With the seawater samples, the zeolite-based adsorbents showed higher K recovery (4–14%) than the manganese nodule (0–8.8%). The K sorption on the zeolite-based adsorbents followed the pseudo-second-order kinetics and the K sorption rates were higher for the treated zeolite than the natural zeolite. The repeated sorption tests showed that the natural zeolite could potentially be reused up to three times without any significant loss of K sorption capacity, while the ammonium acetate-treated zeolite lost its K sorption capacity after the single sorption test. Overall, the results show that the manganese nodule may potentially be the alternative to zeolite for K recovery under certain conditions, yet the zeolite-based adsorbents are generally better than the manganese nodule. Thus, more studies to enhance the K recovery using zeolite, including surface modified zeolite, are recommended.

scholarly journals Hibiscus Asper (Raman Kogi) Fibre Use as a Sorbent for Oil Spill Clean in Water Body

2019 ◽  
pp. 1-11
Author(s):  
N. E. Alpha ◽  
J. T. Barminas ◽  
S. A. Osemeahon
Keyword(s):  
Sorption Capacity ◽  
Oil Spill ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Solvent System ◽  
Oil Sorption ◽  
Acetyl Group ◽  
Ft Ir ◽  
Material Evidence ◽  
Better Than

This research aimed at investigating the possibility of using Imperata cylindrical fibre as a sorbent for oil spill clean-up. The acetylation was carried out in a free solvent system under mild conditions using acetic anhydride, in the presence of calcium chloride as a catalyst, at a temperature of 100oC for 3 hours. The crude oil and the Hibiscus asper sorbent were characterised, the sorption behaviours studied were found to increase with an increase in weight per gain percent (WPG%). The WPG% and oil sorption capacity indicated the success of acetylation. Fourier transform infrared spectroscopy (FT-IR) was used for the analysis of unmodified and modified Hibiscus asper sorbent to further examine the success of acetylation. In the spectra of FT-IR of the acetylated Hibiscus asper material evidence of acetylation is clearly proven by, the enhancement of 1755 cm-1, as 1755.31-1715.97 cm-1 which are carbonyl C=O stretching of esters, the enhancement of 1494.97 -1403.35 cm-1 of (C-H bond in –O(C=O)-CH3 and the appearance of 1154.69- 1154.43 cm-1 which is a C=O stretching of acetyl group. The values for the correlation coefficient (R2) showed that the model fitted the Langmuir isotherm (R2 Hibiscus asper 0.99) better than the Freundlich isotherm, indicating that the adsorption process was a monolayer. The higher oil sorption capacity shown by the modified Hibiscus asper sorbent compared to the lower oil sorption capacity of unmodified indicated that the modified Hibiscus asper sorbent can substitute for synthetic fibres and recommended for oils spill clean-up in contaminated environments.

scholarly journals Facile Fabrication of Recyclable, Superhydrophobic, and Oleophilic Sorbent from Waste Cigarette Filters for the Sequestration of Oil Pollutants from an Aqueous Environment

Processes ◽  
2018 ◽  
Vol 6 (9) ◽  
pp. 140 ◽  
Author(s):  
Augustine Ifelebuegu ◽  
Egetadobobari Lale ◽  
Fredrick Mbanaso ◽  
Stephen Theophilus
Keyword(s):  
Sorption Capacity ◽  
Chemical Vapour ◽  
Water Repellency ◽  
Environmental Damage ◽  
Aqueous Environment ◽  
Water Contact ◽  
Water Separation ◽  
Oil Sorption ◽  
Oil Water Separation ◽  
Surface Modified

The oil industry is plagued with regular incidences of spills into the environment, causing environmental damage to flora and fauna, especially in marine environments where spills easily travel long distances from their sources. This study was carried out to investigate a simple two-step process for the conversion of waste cigarette filters into a superhydrophobic and oleophilic sorbent for application in oil/water separation and spill clean-up. Ultrasonically cleaned filters were surface modified by chemical vapour deposition using methyltrichlorosilane. The results show that the functionalised waste filters achieved superhydrophobic properties with a water contact angle of 154 ± 3.5°, adsorbing 16 to 26 times their weights in various oils, which is a better oil sorption performance than those of commercially available non-woven polypropylene adsorbents. Also, the sorption capacity did not significantly deteriorate after 20 cycles of reuse, with up to 75% sorption capacity retained. The surface modified filters demonstrated excellent water repellency, oil sorption, and recyclability showing their potential application for full scale oil spill clean-up.

scholarly journals Use of aminated hulls of sunflower seeds for the removal of anionic dyes from aqueous solutions

2019 ◽  
Vol 17 (3) ◽  
pp. 1211-1224 ◽  
Author(s):  
T. Jóźwiak ◽  
U. Filipkowska ◽  
S. Brym ◽  
L. Kopeć
Keyword(s):  
Sorption Capacity ◽  
Textile Industry ◽  
Sunflower Seed ◽  
Freundlich Isotherm ◽  
Sorption Kinetics ◽  
Reactive Black 5 ◽  
Anionic Dyes ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption

Abstract In this study, we analyzed the effectiveness of sorption of dyes popular in the textile industry (Reactive Black 5, Reactive Yellow 84, Acid Yellow 23, and Acid Red 18) on aminated and non-aminated seed hulls of common sunflower (Helianthus annuus L.). The scope of the study included: determination of the effect of pH on dye sorption effectiveness, sorption kinetics analyses (sorption equilibrium time, pseudo-first-order/pseudo-second-order model, intramolecular diffusion model), and determination of the maximum sorption capacity against dyes (Langmuir/Freundlich isotherm). The sorbent was subjected to the FTIR analysis. The sorption capacity of the aminated sunflower seed hulls against reactive dyes RB5 and RY84 accounted for 51.02 mg/g and 63.27 mg/g, respectively, and was higher by 1665% (17.6 times higher) and 1425% (15.3 times higher) compared to that of non-modified hulls. In the case of acidic dyes, Acid Yellow 23 and Acid Red 18, the sorption capacity of the aminated sunflower seed hulls reached 44.78 mg/g and 42.19 mg/g, respectively, and was higher by 1881% (19.8 times higher) and 2284% (23.8 times higher), respectively, compared to the non-modified hulls.

Use of surface modified natural zeolite (SMNZ) in pharmaceutical preparations. Part 2. A new approach for a fast functionalization of zeolite-rich carriers

2016 ◽  
Vol 235 ◽  
pp. 42-49 ◽  
Author(s):  
Bruno de Gennaro ◽  
Mariano Mercurio ◽  
Piergiulio Cappelletti ◽  
Lilia Catalanotti ◽  
Aleksandra Daković ◽  
...  
Keyword(s):  
Natural Zeolite ◽  
Pharmaceutical Preparations ◽  
New Approach ◽  
Surface Modified

Adsorption Characteristics of Natural Zeolite on Ammonia Nitrogen

2012 ◽  
Vol 599 ◽  
pp. 501-504 ◽  
Author(s):  
Wei Ping Wang ◽  
Wei Wang ◽  
Ya Qun Zhou
Keyword(s):  
Adsorption Isotherm ◽  
Natural Zeolite ◽  
Adsorption Process ◽  
Nitrogen Adsorption ◽  
Ammonia Nitrogen ◽  
Absorption Effect ◽  
Nitrogen Adsorption Isotherm ◽  
First Order ◽  
Zeolite Particle ◽  
Better Than

The experiments of ammonia nitrogen adsorption isotherm and adsorption kinetics were conducted with natural zeolite, particle size of 1～1.5 mm and 2～4 mm separately. The results show that adsorption isotherm of zeolite on ammonia nitrogen accorded with Freundlich type. The maximum adsorption of crude zeolite and fine zeolite on ammonia nitrogen are 5.83 (mg /g) and 18.38 (mg /g) respectively, which indicated that absorption effect of fine zeolite is better than crude zeolite. The adsorption process of crude zeolite on ammonia nitrogen is first-order reaction with rate constant of 0.02( g•m－2•h－1).

Modification of Natural Clay Surface with Manganese-Oxide for Removal of Cadmium(II) Ion from Aqueous Solution

2017 ◽  
Vol 866 ◽  
pp. 124-127 ◽  
Author(s):  
Woravith Chansuvarn
Keyword(s):  
Surface Modification ◽  
Manganese Oxide ◽  
Simple Procedure ◽  
Cadmium Concentration ◽  
Freundlich Isotherm ◽  
Raw Material ◽  
Basic Solution ◽  
Natural Clay ◽  
Solution Ph ◽  
Surface Modified

Natural clay (NC) and its surface modified with manganese oxide (MnO-NC) was assessed for removal of Cd (II) ion by batch adsorptive process. The surface modification of NC was chemically prepared with manganese chloride in basic solution by simple procedure, resulting in larger surface area than raw material by about 10-times. FT-IR spectra and SEM photograph showed the unique characteristic of MnO-NC after chemically surface modification with MnO2 particles successfully set down onto the NC surface. Under optimum conditions as a function of solution pH of 6.0, adsorbent dose of 5 g/L, contact time of 15 min and initial cadmium concentration of 100 mg/L, the adsorption capacity reach to 30.6 mg/g. By comparing with NC, MnO-NC provides higher adsorptive capability than the one by about 30-times. Based on isotherm estimation, the Langmuir adsorption isotherm showed more suitable for both adsorbents with the best correlation coefficient (r2>0.99) than the Freundlich isotherm. The adsorptive kinetics of Cd (II) onto NC and MnO-NC followed the pseudo-second-order.

scholarly journals Self-Regeneration Hybrid Hydrogel for Bisphenol A Adsorption in Water

2021 ◽  
Author(s):  
Mingyue Piao ◽  
Hongxue Du ◽  
Yuwei Sun ◽  
Honghui Teng
Keyword(s):  
Bisphenol A ◽  
Adsorption Capacity ◽  
Freundlich Isotherm ◽  
Significant Loss ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Hybrid Hydrogel ◽  
Polyethylene Glycol Diacrylate ◽  
Glycol Diacrylate ◽  
Pseudo Second Order

Abstract Hybrid hydrogel was synthesized by immobilizing TiO2 in polyethylene glycol diacrylate (TiO2@PEGDA) as an efficient adsorbent with photocatalysis property for bisphenol A (BPA) elimination. TiO2@PEGDA exhibited spherical and rough structure with limited crystallinity and abundant functional groups. The contact angle was 61.96°, indicating that TiO2@PEGDA is hydrophilic. The swelling capacity of TiO2@PEGDA (9.0%) was decreased compared with pristine PEGDA (15.6%). Adsorption results demonstrated that the maximum adsorption capacity of TiO2@PEGDA (101.4 mg/g) for BPA was slightly higher than pristine PEGDA (97.68 mg/g). The adsorption capacity was independent with pH at pH ＜ 8.0, and decreased obviously when the value of pH was higher than 8.0. The adsorption behavior was fitted well with the pseudo-second-order kinetic and the Freundlich isotherm model. Both ΔG0 and ΔH0 were negative, indicating that BPA adsorbed on TiO2@PEGDA was an exothermic and spontaneous process. Regeneration study was performed by photocatalysis, and the adsorption capacity was 85.6% compared with the initial capacity after four cycles of illumination, indicating that TiO2@PEGDA could be recycled without significant loss of adsorption capacity. Consequently, TiO2@PEGDA can serve as an eco-friendly and promising material for efficiently adsorbing BPA with self-clean property.

scholarly journals Evaluation of Lagergren Kinetics Equation by Using Novel Kinetics Expression of Sorption of Zn2+ onto Horse Dung Humic Acid (HD-HA)

2018 ◽  
Vol 16 (3) ◽  
pp. 338 ◽  
Author(s):  
Bambang Rusdiarso ◽  
Rahmat Basuki ◽  
Sri Juari Santosa
Keyword(s):  
Humic Acid ◽  
Kinetic Model ◽  
Sorption Capacity ◽  
Complex Function ◽  
Freundlich Isotherm ◽  
Isotherm Model ◽  
Extraction And Purification ◽  
Langmuir Isotherm Model ◽  
Desorption Rate Constant ◽  
Kinetic Expression

Extraction and purification of humic acid from dry horse dung powder (HD-HA) was performed successfully and the purified HD-HA was then applied as sorbent to adsorb Zn2+. Extraction and purification were performed based on procedure of Stevenson (1994) under atmospheric air. Parameters investigated in this work consist of effect of medium sorption acidity, sorption rate (ka) and desorption rate constant (kd), Langmuir (monolayer) and Freundlich (multilayer) sorption capacities, and energy (E) of sorption. The ka and kd were determined according to the kinetic model of second order sorption reaching equilibrium, monolayer sorption capacity (b) and energy (E) were determined according to Langmuir isotherm model, and multilayer sorption capacity (B) was determined based on Freundlich isotherm model. Sorption of Zn2+ on purified HD-HA was maximum at pH 5.0. The novel kinetic expression resulted from proposed kinetic model has been shown to be more applicable than the commonly known Lagergren equation obtained from the pseudo-first order sorption model. The application of the equation revealed that the intercept of Lagergren equation, ln qe was more complex function of initial concentration of Zn2+ (a), Langmuir sorption capacity (b), and sorbed Zn2+ at equilibrium (xe).

scholarly journals SURFACE MODIFICATION OF CANARIUM OVATUMENGL.(PILI) SHELL AS ADSORBENT OF LEAD(Pb2+) FROM AQUEOUS SOLUTION

2021 ◽  
Author(s):  
Ernesto Jr. S. Cajucom ◽  
◽  
Lolibeth V. Figueroa ◽  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Freundlich Isotherm ◽  
Cost Effective ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Carboxylic Groups ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Surface Modified

This study was carried out to investigate the efficiency of raw pili shell (RPS) and the surface modified pili shell using EDTA (EMPS) and oxalic acid (OMPS). A comparative study on the adsorption capacity of the adsorbents was performed against lead (Pb2+) from aqueous solution. The adsorbents were characterized by FTIR, which showed higher peak of adsorption bands of carboxylic groups on the acid modified pili shells. Scanning electron microscope orSEM was also used to describe the surface morphology of the adsorbents. The linear form of Langmuir and Freundlich models were applied to represent adsorption data. The calculated equilibrium data of Pb (II) best fitted to Langmuir compare to Freundlich isotherm model with maximum adsorption capacity (qmax) of 27.03 mg/g and 45.45 mg/g using EMPS and OMPS, respectively. Kinetic sorption models were used to determine the adsorption mechanism and the kinetic data of all the adsorbents correlated (R2=1) wellwith the pseudo second order kinetic model. Among the three adsorbents, OMPS shown higher percent removal of lead compared to RPS and EMPS. The large adsorption capacity rate indicated that chemically modified pili shell in present study has great potential to be used as a cost-effective adsorbent for the removal of lead ions from the water.

scholarly journals Adsorption Behaviour of Chromium(VI) onto Surface Modified Sugarcane Waste

2013 ◽  
Vol 28 (1-2) ◽  
pp. 113-122
Author(s):  
Kedar Nath Ghimire ◽  
Deepak Wagle ◽  
Suman Lal Shrestha
Keyword(s):  
Volume Ratio ◽  
Freundlich Isotherm ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adsorption Method ◽  
Chromium Vi ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Surface Modified

An effective chemically modified adsorbent based on sugarcane waste has been prepared by treating with concentrated sulphuric acid in 2:1weight/volume ratio. Thus prepared adsorbent has been found to be effective in the adsorption of chromium from aqueous medium. The efficacy of the adsorbent in the removal of chromium was evaluated by batch adsorption method. The effect of initial concentration, contact time and pH of the solution was investigated. The maximum adsorption capacity onto this adsorbent was found to be 195 mg/g at their optimal pH 1 at which unmodified bagasse has only 58 mg/g. The characterization of adsorbent was done by determining surface area and Boehm’s titration method. Freundlich isotherm and pseudo-second order kinetic model gave better explanation of the adsorption process.

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