scholarly journals Study of carbon dioxide and methane adsorption on carbon molecular sieves, raw and modified by waste engine oil

2020 ◽  
Vol 85 (8) ◽  
pp. 1083-1093
Author(s):  
Reza Zahedi ◽  
Hossein Ghafourian ◽  
Yahya Zamani ◽  
Shahrzad Khoramnejhadian ◽  
Reza Dabbagh
Keyword(s):  
Adsorption Capacity ◽  
Molecular Sieves ◽  
Engine Oil ◽  
Physical Activation ◽  
Solvent Mixtures ◽  
Carbon Molecular Sieve ◽  
Waste Engine Oil ◽  
Adsorption Capacities ◽  
Enhanced Adsorption ◽  
Adsorption Of Co2

In this study, a carbon molecular sieve (CMS) was synthesized from walnut shells, followed by physical activation of the carbon content of the CMS. Adsorption of CO2 and CH4 onto raw and acid treated adsorbents were investigated using two sizes, 300?600 and 600?1180 ?m. The adsorbents were impregnated with two solvent mixtures of waste engine oil with kerosene and with thinner at a proportion of 1:1 at 25?C. The highest adsorption for CO2 and CH4 was obtained at the suitable size of a group of CMS(A) adsorbents, with acid treated adsorbents being more efficient than the raw adsorbents. The acid treated CMS(A-3) sample adsorbed 0.925 mol CO2 g-1 and 0.353 mol CH4 g-1. The results indicated that by decreasing the granulation size of group CMS(R) adsorbents, the adsorption capacities for CO2 and CH4 were reduced while increasing the granulation size of group CMS(A) adsorbents resulted in an enhancement in the adsorption capacity for CO2 and CH4. Moreover, acid treated adsorbents achieved enhanced adsorption capacity for CO2 and CH4. Further modifications reduced the adsorption capacity for CO2 and CH4 in impregnated adsorbents, due to a decrease in surface area, pore volume and pore size of the adsorbent.

scholarly journals Enhanced Adsorption and Removal of Ciprofloxacin on Regenerable Long TiO2Nanotube/Graphene Oxide Hydrogel Adsorbents

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Yuan Zhuang ◽  
Fei Yu ◽  
Jie Ma
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
3D Structure ◽  
Regeneration Ability ◽  
Graphene Sheets ◽  
Simple Method ◽  
Adsorption Capacities ◽  
Reduced Graphene ◽  
Enhanced Adsorption ◽  
Better Than

To improve the adsorption performance and regeneration ability of adsorbent, a simple method was designed to synthesize long TiO2nanotube/reduced graphene oxide (rGO-TON) hydrogel, which has good adsorption and regeneration capacity toward ciprofloxacin. rGO-TON hydrogel could form 3D structure, which makes the separation and regeneration of adsorbent easy. For comparison, commercial P25 particle is used to prepare composite hydrogel with rGO; the results showed that TiO2nanotube supports the graphene sheets better than P25 particles, which would reduce the agglomeration of graphene sheets. rGO-TON have larger specific surface area (138.2 m2/g) than rGO-P25 (79.4 m2/g). In this paper, ciprofloxacin was chosen as target pollutants, the rGO-TON obtain excellent adsorption capacity, and the maximum adsorption capacities of rGO-TON for ciprofloxacin calculated from Langmuir model are 178.6 mg/g (R2=0.9929), 181.8 mg/g (R2=0.9954), and 108.7 mg/g (R2=0.9964) for graphene oxide (GO), GO-TON, and GO-P25, respectively. In regeneration, the adsorption capacity of rGO-TON and rGO-P25 has little reduced after 5 cycles, while the adsorption capacity of rGO decreases to below 100 mg/g. Results of this work are of great significance for environmental applications of regenerable long TiO2nanotube/graphene oxide hydrogel as a promising adsorbent nanomaterial for antibiotic pollutants from aqueous solutions.

scholarly journals Effect of Ionic Charge on the Adsorption of Sodium-Palmitate and Sodium-Laurate onto Galena, Hematite and Cassiterite in Aqueous Solution

2010 ◽  
Vol 7 (4) ◽  
pp. 1491-1497 ◽  
Author(s):  
Millicent U. Ibezim-Ezeani ◽  
Alphonso C. I. Anusiem
Keyword(s):  
Adsorption Capacity ◽  
Double Layer ◽  
Aqueous Media ◽  
Sodium Laurate ◽  
Sodium Palmitate ◽  
Ionic Charge ◽  
Adsorption Capacities ◽  
Adsorbate Concentration ◽  
Enhanced Adsorption ◽  
Charged Ions

The effect of ionic charge on the adsorption of sodium-palmitate and sodium-laurate onto galena, hematite and cassiterite surfaces in aqueous media was studied. The adsorption capacities were determined as a function of adsorbate concentration in the presence of various anions and cations at pH 7.31 and 29 °C. Positively charged ions depressed the adsorption capacity in the order: K+> Ba2+> Al3+, showing a reverse correlation with the charge to size ratio of these ions indicating a possible expansion of the double layer that results from predominant diffusion effect and electrostatic effect to some extent. The negatively charged ion enhanced adsorption capacity in the order: PO43-> SO42-> NO3-. This is attributed to the compression of the double layer through electrostatic interaction. In all the studies the adsorption capacities for the adsorbents were in the order: galena > hematite > cassiterite corresponding to the trend in the specific surface area of the adsorbents.

scholarly journals The Physiochemical Properties and Adsorption Characteristics of Processed Pomelo Peel as a Carrier for Epigallocatechin-3-Gallate

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4249
Author(s):  
Liangyu Wu ◽  
Guoying Zhang ◽  
Jinke Lin
Keyword(s):  
Adsorption Capacity ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Isothermal Adsorption ◽  
Physiochemical Properties ◽  
Pomelo Peel ◽  
Adsorption Capacities ◽  
Endothermic Process ◽  
Pseudo Second Order ◽  
Enhanced Adsorption

The NaOH-HCl- and ethanol-pretreated pomelo peel samples were prepared to apply to the batch adsorption for epigallocatechin-3-gallate (EGCG). The characteristics of peel samples were determined by Fourier transform infrared spectroscopy, scanning electron microscopy and a laser particle analyzer. The results of the physiochemical properties of the peel samples demonstrate that these peel samples have a promising adsorption capacity for EGCG, because of the increased potential binding sites on the surface compared with those of untreated peel samples. These two peel samples showed enhanced adsorption capacities of EGCG compared with that of unmodified peel in terms of the isothermal adsorption process, which could be described by both Langmuir and Freundlich models, with the theoretical maximum adsorption capacity of 77.52 and 94.34 mg g−1 for the NaOH-HCl and ethanol-treated peel samples, respectively. The adsorption kinetics demonstrated an excellent fitness to pseudo-second-order, showing that chemisorption was the rate-limiting step. The thermodynamics analysis revealed that the adsorption reaction was a spontaneous and endothermic process. This work highlights that the processed pomelo peels have outstanding adsorption capacities for EGCG, which could be promising candidates for EGCG delivering in functional food application.

scholarly journals Microwave Enhanced Synthesis of Chitosan-graftMolecularly Imprinted Polymer (MIP) for Selective Extraction of Antioxidants

2010 ◽  
Vol 7 (4) ◽  
pp. 1362-1374 ◽  
Author(s):  
N. Saifuddin ◽  
A. A. Nur Yasumira
Keyword(s):  
Adsorption Capacity ◽  
Selective Extraction ◽  
Maximum Adsorption Capacity ◽  
Imprinted Polymer ◽  
Chitosan Beads ◽  
Molecularly Imprinted ◽  
Adsorption Models ◽  
Adsorption Capacities ◽  
Enhanced Adsorption ◽  
Functional Matrix

Polymers have been molecularly imprinted for the purpose of binding specifically toα-tocotrienol (vitamin E). A molecularly imprinted polymer (MIP) material was prepared usingα-tocotrienol as the imprinted molecule, acrylamide as functional monomer and macroporous chitosan beads as functional matrix. Chitosan-graft-polyacrylamide was synthesized without any radical initiator or catalyst using microwave (MW) irradiation. The representative microwave synthesized graft copolymer was characterized by fourier transform-infrared spectroscopy, taking chitosan as a reference. Microwave irradiation was exploited for polyacrylamide grafting on the cross-linked chitosan beads to produce MIP, where both time as well as chemicals can be saved. It can be assumed that the chitosan coated polyacrylamide MIP will have better pH stability and enhanced adsorption capacity. The maximum adsorption capacity was observed to be 3.95 mg/g of MIP, which gave removal efficiency of 93%. After 4 h, the change of adsorption capacities forα-tocotrienol did not show notable effects. The Langmuir and Freundlich adsorption models were also applied to describe the equilibrium isotherms.

Controlling porosity and density of nanocellulose aerogels for superhydrophobic light materials

TAPPI Journal ◽  
2018 ◽  
Vol 17 (03) ◽  
pp. 145-153 ◽  
Author(s):  
Chengua Yu ◽  
Feng Wang ◽  
Shiyu Fu ◽  
Lucian Lucia
Keyword(s):  
Contact Angle ◽  
Freeze Drying ◽  
Engine Oil ◽  
High Porosity ◽  
Water Mixture ◽  
Waste Engine Oil ◽  
Hydrophobically Modified ◽  
Static Contact ◽  
Oil Water ◽  
Hydrophobic Material

A very low-density oil-absorbing hydrophobic material was fabricated from cellulose nanofiber aerogels–coated silane substances. Nanocellulose aerogels (NCA) superabsorbents were prepared by freeze drying cellulose nanofibril dispersions at 0.2%, 0.5%, 0.8%, 1.0%, and 1.5% w/w. The NCA were hydrophobically modified with methyltrimethoxysilane. The surface morphology and wettability were characterized by scanning electron microscopy and static contact angle. The aerogels displayed an ultralow density (2.0–16.7 mg·cm-3), high porosity (99.9%–98.9%), and superhydrophobicity as evidenced by the contact angle of ~150° that enabled the aerogels to effectively absorb oil from an oil/water mixture. The absorption capacities of hydrophobic nanocellulose aerogels for waste engine oil and olive oil could be up to 140 g·g-1 and 179.1 g·g-1, respectively.

Analisis Variasi Temperatur Aktivasi Terhadap Daya Serap Arang Aktif Tandan Aren (Arenga Pinnata Merr) Dengan Agen Aktivasi Potassium Silicate(K2SiO3)

2020 ◽  
Vol 5 (3) ◽  
pp. 221
Author(s):  
Muhammad Azam ◽  
Muhammad Anas ◽  
Erniwati Erniwati
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Temperature Variation ◽  
Chemical Activation ◽  
Weight Ratio ◽  
Potassium Silicate ◽  
Physical Activation ◽  
Activation Temperature ◽  
Pyrolysis Reactor

This study aims to determine the effect of variation of activation temperature of activated carbon from sugar palm bunches of chemically activatied with the activation agent of potassium silicate (K2SiO3) on the adsorption capacity of iodine and methylene blue. Activated carbon from bunches of sugar palmacquired in four steps: preparationsteps, carbonizationstepsusing the pyrolysis reactor with temperature of 300 oC - 400 oC for 8 hours and chemical activation using of potassium silicate (K2SiO3) activator in weight ratio of 2: 1 and physical activation using the electric furnace for 30 minutes with temperature variation of600 oC, 650 oC, 700 oC, 750 oC and 800 oC. The iodine and methyleneblue adsorption testedby Titrimetric method and Spectrophotometry methodrespectively. The results of the adsorption of iodine and methylene blue activated carbon from sugar palm bunches increased from 240.55 mg/g and 63.14 mg/g at a temperature of 600 oC to achieve the highest adsorption capacity of 325.80 mg/g and 73.59 mg/g at temperature of 700 oC and decreased by 257.54 mg/g and 52.03 mg/g at a temperature of 800 oCrespectively.However, it does not meet to Indonesia standard (Standard Nasional Indonesia/SNI), which is 750 mg/g and 120 mg/g respectively.

scholarly journals Enhanced Adsorption of Bisphenol A from Aqueous Solution with 2-Vinylpyridine Functionalized Magnetic Nanoparticles

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1136 ◽  
Author(s):  
Qiang Li ◽  
Fei Pan ◽  
Wentao Li ◽  
Dongya Li ◽  
Haiming Xu ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Magnetic Nanoparticle ◽  
Maximum Adsorption Capacity ◽  
Salting Out ◽  
Functionalized Magnetic Nanoparticles ◽  
Ft Ir ◽  
Fe3o4 Nanospheres ◽  
Enhanced Adsorption

In this study, a novel 2-vinylpyridine functionalized magnetic nanoparticle (Mag-PVP) was successfully prepared. The prepared Mag-PVP was characterized by transmission electronic microscopy (TEM), Fourier transform infrared spectrophotometry (FT-IR), vibrating sample magnetometry (VSM) and thermogravimetric analysis (TGA), and was used for the adsorption of bisphenol A (BPA) from aqueous solutions. Mag-PVP, which is composed of Fe3O4 nanoparticles and poly divinylbenzene-2-vinylpyridine (with a thickness of 10 nm), exhibited magnetic properties (Ms = 44.6 emu/g) and thermal stability. The maximum adsorption capacity (Qm) of Mag-PVP for BPA obtained from the Langmuir isotherm was 115.87 mg/g at 20 °C, which was more than that of Fe3O4 nanospheres. In the presence of NaCl, the improved adsorption capacity of Mag-PVP was probably attributed to the screening effect of Mag-PVP surface charge and salting-out effect. In the presence of CaCl2 and humic acid (HA), the adsorption capacity of BPA decreased due to competitive adsorption. The adsorption of BPA by Mag-PVP increased slightly with the increase in pH from 3.0 to 5.0 and obtained the largest adsorption amount at pH 5.0, which was probably attributed to hydrogen bonding interactions. Moreover, in actual water, Mag-PVP still showed excellent adsorption performance in removing BPA. The high adsorption capacity and excellent reusability performance in this work indicated that Mag-PVP was an effective adsorbent for removing BPA from aqueous solutions.

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