Studies on Copper Ion Adsorption Using Pectin/Functionalized-Silica Coated Cellulose

2015 ◽  
Vol 1131 ◽  
pp. 210-214
Author(s):  
Radchada Buntem ◽  
Thitiwat Tanyalax
Keyword(s):  
Hydrochloric Acid ◽  
Adsorption Capacity ◽  
Filter Paper ◽  
Copper Ion ◽  
Silica Sol ◽  
Ion Adsorption ◽  
Functionalized Silica ◽  
Solution Ph ◽  
Optimum Ph ◽  
Sem Micrograph

The pectin/functionalized silica coated filter paper (FILPSL2) was used for copper ion adsorption. Silica sol (1), prepared by mixing ethanol, water, TEOS and hydrochloric acid, was slowly added into pectin solution. A piece of filter paper (2 cm x 2 cm) was immersed in the silica-pectin solution for 1 hr. The coated filter paper was dried at room temperature and then oven-dried at 50 °C for 6 hrs to obtain FILPS. The silica sol (2) was subsequently prepared by mixing ethanol, water, N-[3-(Trimethoxysilyl) propyl] ethylenediamine (L2) and hydrochloric acid. The FILPS was immersed in silica sol (2) and the coated paper was oven-dried at 50 °C for 6 hrs to obtain FILPSL2. The SEM micrograph of uncoated Filter paper (FIL) and FILPSL2 showsa characteristic woven pattern. For copper ion adsorption, FILPSL2 was put into 0.1 M of CuCl2solution (pH 2, 25 °C). The color of the paper changes from off-white to intense blue within 5 min due to the complex between amino group of functionalized silica and Cu2+ as evidenced from IR spectroscopy.The equilibrium adsorption percentage and adsorption capacity were 27.10 and 5.5 x 10-3 respectively. The concentrations of copper ion solutions were varied to 10-2and 10-3M at this pH. The lower concentration of copper ion results in the higher adsorption percentage. While the lower concentration of copper ion results in the lower adsorption capacity. The adsorption was also experimented at pH 3.The similar trend was obtained. The optimum pH for adsorption for all concentrations was 2. The effect of interferences on the copper ion adsorption depends on the pH. At pH 2, Ni2+ has a stronger effect. While Cd2+ has a stronger effect at pH 3. The desorption was performed using 0.2 M CH3COOH solution. The complete desorption occurred within 30 min.

Preparation of organically functionalized silica gel as adsorbent for copper ion adsorption

2009 ◽  
Vol 21 (11) ◽  
pp. 1473-1479 ◽  
Author(s):  
Hongjie WANG ◽  
Jin KANG ◽  
Huijuan LIU ◽  
Jiuhui QU
Keyword(s):  
Silica Gel ◽  
Copper Ion ◽  
Ion Adsorption ◽  
Functionalized Silica

scholarly journals Chemical Modification of Bagasse-Based Mesoporous Carbons for Chromium(III) Ion Adsorption

2017 ◽  
Vol 15 (1_suppl) ◽  
pp. 52-61
Author(s):  
Haiwen Ma ◽  
Kunquan Li ◽  
Qiangfei Chai
Keyword(s):  
Adsorption Capacity ◽  
Ion Adsorption ◽  
Mesoporous Carbons ◽  
Solution Ph ◽  
High Efficient ◽  
Kinetic Rates ◽  
Key Factor ◽  
Pseudo Second Order ◽  
Xps Study ◽  
H3po4 Activation

Aims Modified bagasse-based mesoporous carbons were prepared for the efficient chromium(III) ion adsorption and removal from aqueous solutions. Methods Mesoporous carbons were prepared from bagasse with H3PO4 activation and subsequently oxidized with nitric acid and modified with ethylenediamine. Results The results showed that the modified carbon was rich in mesopores, oxygen and nitrogen-containing groups, and the Cr(III) adsorption capacity was greatly improved after modification, which was found to be higher than both pristine and oxidized carbons. The Cr(III) adsorption capacity on modified carbon was significantly influenced by the solution pH, and the optimum pH was 6 with the maximum Cr(III) adsorption capacity up to 24.61mg/g, which was almost 3 times higher than that for pristine carbon. Thermodynamic results manifested the adsorption was spontaneous and endothermic. Kinetic rates fitted the pseudo-second-order model very well. XPS study indicated the amino group was a key factor of the high efficient adsorption.

Amine-Functionalized Silica Monolith as a Copper Ion Adsorbent

2015 ◽  
Vol 1131 ◽  
pp. 198-202
Author(s):  
Radchada Buntem ◽  
Kewarin Pramual
Keyword(s):  
Metal Ion ◽  
Copper Ion ◽  
Tetraethyl Orthosilicate ◽  
Ion Concentration ◽  
Polymerization Process ◽  
Ion Adsorption ◽  
Functionalized Silica ◽  
Silica Monoliths ◽  
Silica Monolith ◽  
Amine Functionalized

Amine-functionalized silica monoliths were prepared by co-condensation between tetraethyl orthosilicate and N-[3-(trimethoxysilyl) propyl] ethylenediamine.The mixture between ethanol, H2O, tetraethyl orthosilicate, N-[3-(trimethoxysilyl) propyl] ethylenediamine and 1M HCl was stirred for 1 hour at room temperature to obtain a clear silica sol. 1.2 g of the sol was poured into plastic vial with the paraffin cover and left for 2 days for the polymerization process to obtain the gel. The disc-shape gel was dried in the oven at 50 °C for 10 hours. The silica monolith obtained was weighed and analyzed by IR spectroscopy and BET method. The disc-shape silica monoliths were further used for copper ion adsorption studies. The factors affecting the copper ion adsorption like pH, copper ion concentration and metal ion interference were studied. The pHs of CuCl2 aqueous solutions were varied from pH 2 to pH 6. While the Cu2+ concentrations under this study were 10-1, 10-2, 10-3, 10-4, 10-5 and 10-6 M. The cationic interferences used were Cd2+ and Ni2+. For the copper ion concentration, the higher the concentration results in the higher adsorption capacity. At the lower concentrations like 10-4, 10-5 and 10-6 M, a complete adsorption was obtained. The color of the Cu2+ - loaded monolith was changed to blue due to the complex between amino groups on the silica and the Cu2+ as evidenced by IR analysis. The monolith after adsorption was also analyzed by SEM/EDS. The inferences like Cd2+ and Ni2+ affect the Cu2+ adsorption at different degree. The desorption could be successfully performed by using 0.1 M HCl solution.

Synthesis of Dendrimer-Like Polyamidoamine on Silica Gel Surface and their Adsorption Properties for Cr 3+

2012 ◽  
Vol 554-556 ◽  
pp. 299-302
Author(s):  
Zai Man Liu ◽  
Ji Ping Lv ◽  
Bai Yu Li ◽  
Nai Pu He
Keyword(s):  
Adsorption Capacity ◽  
Silica Gel ◽  
Ester Group ◽  
Solution Ph ◽  
Hydrolysis Method ◽  
Ester Exchange ◽  
Optimum Ph ◽  
Ph Range ◽  
Optimum Ph Range

Amino functional silica gel was synthesized by in-situ hydrolysis method in the present of silane coupling agent. Then dendrimer-like polyamidoamines based on the silica gel surface (PAMAM-SG) were prepared using Micheal addition of the amino and methyl acrylate, and ester-exchange of ethylene diamine and the ester group. The effects of solution pH, concentration and temperature on the adsorption capacity of PAMAM-SG for Cr3+were studied. The optimum pH range is 4.0-7.0. The adsorption rate decreased with increasing the time, but increased with increasing the temperature. The adsorption capacity increased with increase of the concentration until the adsorption reached equilibrium. The adsorption capacity increased with the generations of PAMAM-SG.

scholarly journals Adsorption of copper ions from solution using xanthate wheat straw

2020 ◽  
Vol 82 (10) ◽  
pp. 2029-2038
Author(s):  
Qiehui Guo ◽  
Zhongyang Zang ◽  
Jie Ma ◽  
Jingyi Li ◽  
Tong Zhou ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Adsorption Capacity ◽  
Copper Ions ◽  
Adsorption Property ◽  
Copper Ion ◽  
Order Kinetic ◽  
Solution Ph ◽  
Column Adsorption ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Abstract To enhance adsorption capacity of wheat straw (WS) toward copper ion from solution, carbon disulfide was used to modify WS by a facile grafting method through epichlorohydrin and ethylenediamine. So WS containing xanthate groups (XWS) was obtained. The XWS was characterized using elemental analysis, X-ray diffraction, infrared spectroscopy and adsorption property of XWS toward copper ions. The results showed that S was introduced into the surface of WS. The solution pH was in favor of Cu2+ adsorption at pH 5, while NaCl existing in solution was slightly favorable for adsorption. The adsorption kinetic followed the pseudo-second-order kinetic model, while the adsorption isotherm curve was well fitted using the Langmuir model. The adsorption capacity was 57.5 mg·g−1 from experiment. The process was entropy-produced, endothermic and spontaneous in nature. The column adsorption was performed and Yan model was good to predict the breakthrough curve. XWS as adsorbent is promising to remove copper ions from solution, and this offers one way of effective utilization of waste byproduct from agriculture.

scholarly journals STUDI KESEIMBANGAN ADSORPSI MERKURI(II) PADA BIOMASSA DAUN ENCENG GONDOK (Eichhornia crassipes)

ALCHEMY ◽  
2012 ◽  
Author(s):  
Muhammad Chalid Al-ayubi ◽  
Himmatul Barroroh ◽  
Diana Candra Dewi
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Energy ◽  
Langmuir Isotherm ◽  
Metal Ion ◽  
Eichhornia Crassipes ◽  
Leaf Biomass ◽  
Ion Adsorption ◽  
Mercury Adsorption ◽  
Metal Ion Adsorption ◽  
Optimum Ph

Metal ion adsorption research with utilizing Eichhornia crassipes leaf biomass has been done. Metal ions which are ever researched are Cr, Cd, Pb and Ni, but research with utilizing Hg metal ion is never done, so need to be implemented a mercury adsorption research to eichhornia crassipes leaf biomass. Because pH solution is very influential to metal ion adsorption by biomass, so in this research is inspected determining of optimum pH to mercury adsorption. This research is experimental research which is started with determining of optimum pH, this determining of optimum pH is implemented with way of interacting 60 mmg/L mercury metal ion with 0,1 gr eichhornia crassipes leaf biomass for 60 minutes at range of pH 2, 3, 4, 5, 6, 6, 4, 6, 7, 7 and 8, then continued with control solution production to know the solubility of mercury in every pH. The determination of adsorption capacity, adsorption constanta and adsorption energy are implemented with way of interacting eichhornia crassipes leaf biomass with mercury metal ion by 20, 30, 40, 50, 60, 70, 80, 90, 100 and 150 mmg/L variation of concentration for 60 minutes in pH optimum. Data the result of experiment then processed using the similarity of Langmuir isotherm and Freunlich.. The result of the research indicates that pH 6 is mercury adsorption optimum pH in eichhornia crassipes leaf biomass. The mercury isotherm adsorption in eichhornia crassipes leaf biomass takes a part of the similarity of langmuir isotherm with point R2 = 0,982, from the similarity of langmuir isotherm gotten adsorption capacity (Xm) in the mount of 4, 806 x 10-5 mol/gr with adsorption constanta (K) 27130,85 mol/L and adsorption energy (E) in the mount of 25,46079 kJ/mol.<br /><br />

Copper Ion Desorption Performance from Triethylenetetramine-Functionalized Polymeric Adsorbents

2012 ◽  
Vol 518-523 ◽  
pp. 709-714
Author(s):  
Chang Kun Liu ◽  
Xu Xin Zhao ◽  
Lin Fang ◽  
Xiao Fang Yue
Keyword(s):  
Nitric Acid ◽  
Hydrochloric Acid ◽  
Copper Ion ◽  
Desorption Kinetics ◽  
Ion Adsorption ◽  
Polymeric Adsorbents ◽  
Desorption Efficiency ◽  
Ion Desorption ◽  
Adsorption Desorption ◽  
Kinetics Of

This paper investigated the copper (Cu) ion desorption performance from the Cu-ion adsorbed triethylenetetramine-functionalized polymeric adsorbents (P-TETA). The influencing factors including desorption agent, desorption acid concentration and solid-to-liquid (S/L) ratio were investigated. It was found that nitric acid and hydrochloric acid (as different desorption agents) gave almost identical high desorption efficiencies. In addition, higher concentration of nitric acid may not result in higher desorption efficiency, and the best desorption efficiency (about 95%) for P-TETA was achieved by 0.25 mol/L nitric acid. Furthermore, the desorption efficiencies with the four selected S/L ratios were all of high value and showed almost no difference. The Cu ion desorption kinetics of Cu-ion adsorbed P-TETA was found to be extremely fast and more than 85% of the desorption efficiency was achieved within 4 minutes. Six cycles of adsorption-desorption-adsorption showed only a slightly decrease in both the Cu ion adsorption capacity and Cu ion desorption efficiency for P-TETA adsorbents.

scholarly journals Adsorptive and Coagulative Removal of Trace Metals from Water Using Surface Modified Sawdust-Based Cellulose Nanocrystals

J ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 193-205
Author(s):  
Opeyemi A. Oyewo ◽  
Sam Ramaila ◽  
Lydia Mavuru ◽  
Taile Leswifi ◽  
Maurice S. Onyango
Keyword(s):  
Trace Metals ◽  
Adsorption Capacity ◽  
Cellulose Nanocrystals ◽  
Inductively Coupled Plasma ◽  
Electrostatic Interactions ◽  
Natural Waters ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Major Drawback ◽  
Surface Modified

The presence of toxic metals in surface and natural waters, even at trace levels, poses a great danger to humans and the ecosystem. Although the combination of adsorption and coagulation techniques has the potential to eradicate this problem, the use of inappropriate media remains a major drawback. This study reports on the application of NaNO2/NaHCO3 modified sawdust-based cellulose nanocrystals (MCNC) as both coagulant and adsorbent for the removal of Cu, Fe and Pb from aqueous solution. The surface modified coagulants, prepared by electrostatic interactions, were characterized using Fourier transform infrared, X-ray diffraction (XRD), and scanning electron microscopy/energy-dispersive spectrometry (SEM/EDS). The amount of coagulated/adsorbed trace metals was then analysed using inductively coupled plasma atomic emission spectroscopy (ICP-AES). SEM analysis revealed the patchy and distributed floccules on Fe-flocs, which was an indication of multiple mechanisms responsible for Fe removal onto MCNC. A shift in the peak position attributed to C2H192N64O16 from 2θ = 30 to 24.5° occurred in the XRD pattern of both Pb- and Cu-flocs. Different process variables, including initial metal ions concentration (10–200 mg/L), solution pH (2–10), and temperature (25–45 °C) were studied in order to investigate how they affect the reaction process. Both Cu and Pb adsorption followed the Langmuir isotherm with a maximum adsorption capacity of 111.1 and 2.82 mg/g, respectively, whereas the adsorption of Fe was suggestive of a multilayer adsorption process; however, Fe Langmuir maximum adsorption capacity was found to be 81.96 mg/g. The sequence of trace metals removal followed the order: Cu > Fe > Pb. The utilization of this product in different water matrices is an effective way to establish their robustness.

scholarly journals Removal of Chromium(III) and Cadmium(II) Heavy Metal Ions from Aqueous Solutions Using Treated Date Seeds: An Eco-Friendly Method

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3718
Author(s):  
Mohammad Azam ◽  
Saikh Mohammad Wabaidur ◽  
Mohammad Rizwan Khan ◽  
Saud I. Al-Resayes ◽  
Mohammad Shahidul Islam
Keyword(s):  
Metal Ions ◽  
Adsorption Capacity ◽  
Low Cost ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Surface Analysis Techniques ◽  
Adsorption Processes ◽  
Ft Ir ◽  
Metal Elution ◽  
Date Pits

The aim of the research was to prepare low-cost adsorbents, including raw date pits and chemically treated date pits, and to apply these materials to investigate the adsorption behavior of Cr(III) and Cd(II) ions from wastewater. The prepared materials were characterized using SEM, FT-IR and BET surface analysis techniques for investigating the surface morphology, particle size, pore size and surface functionalities of the materials. A series of adsorption processes was conducted in a batch system and optimized by investigating various parameters such as solution pH, contact time, initial metal concentrations and adsorbent dosage. The optimum pH for achieving maximum adsorption capacity was found to be approximately 7.8. The determination of metal ions was conducted using atomic adsorption spectrometry. The experimental results were fitted using isotherm Langmuir and Freundlich equations, and maximum monolayer adsorption capacities for Cr(III) and Cd(II) at 323 K were 1428.5 and 1302.0 mg/g (treated majdool date pits adsorbent) and 1228.5 and 1182.0 mg/g (treated sagai date pits adsorbent), respectively. It was found that the adsorption capacity of H2O2-treated date pits was higher than that of untreated DP. Recovery studies showed maximal metal elution with 0.1 M HCl for all the adsorbents. An 83.3–88.2% and 81.8–86.8% drop in Cr(III) and Cd(II) adsorption, respectively, were found after the five regeneration cycles. The results showed that the Langmuir model gave slightly better results than the Freundlich model for the untreated and treated date pits. Hence, the results demonstrated that the prepared materials could be a low-cost and eco-friendly choice for the remediation of Cr(III) and Cd(II) contaminants from an aqueous solution.

scholarly journals Magnetically Recyclable Wool Keratin Modified Magnetite Powders for Efficient Removal of Cu2+ Ions from Aqueous Solutions

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1068
Author(s):  
Xinyue Zhang ◽  
Yani Guo ◽  
Wenjun Li ◽  
Jinyuan Zhang ◽  
Hailiang Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Ion Concentration ◽  
Bet Surface Area ◽  
Chemical Compositions ◽  
Ion Adsorption ◽  
X Ray ◽  
Wool Keratin

The treatment of wastewater containing heavy metals and the utilization of wool waste are very important for the sustainable development of textile mills. In this study, the wool keratin modified magnetite (Fe3O4) powders were fabricated by using wool waste via a co-precipitation technique for removal of Cu2+ ions from aqueous solutions. The morphology, chemical compositions, crystal structure, microstructure, magnetism properties, organic content, and specific surface area of as-fabricated powders were systematically characterized by various techniques including field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), thermogravimetric (TG) analysis, and Brunauer–Emmett–Teller (BET) surface area analyzer. The effects of experimental parameters such as the volume of wool keratin hydrolysate, the dosage of powder, the initial Cu2+ ion concentration, and the pH value of solution on the adsorption capacity of Cu2+ ions by the powders were examined. The experimental results indicated that the Cu2+ ion adsorption performance of the wool keratin modified Fe3O4 powders exhibited much better than that of the chitosan modified ones with a maximum Cu2+ adsorption capacity of 27.4 mg/g under favorable conditions (0.05 g powders; 50 mL of 40 mg/L CuSO4; pH 5; temperature 293 K). The high adsorption capacity towards Cu2+ ions on the wool keratin modified Fe3O4 powders was primarily because of the strong surface complexation of –COOH and –NH2 functional groups of wool keratins with Cu2+ ions. The Cu2+ ion adsorption process on the wool keratin modified Fe3O4 powders followed the Temkin adsorption isotherm model and the intraparticle diffusion and pseudo-second-order adsorption kinetic models. After Cu2+ ion removal, the wool keratin modified Fe3O4 powders were easily separated using a magnet from aqueous solution and efficiently regenerated using 0.5 M ethylene diamine tetraacetic acid (EDTA)-H2SO4 eluting. The wool keratin modified Fe3O4 powders possessed good regenerative performance after five cycles. This study provided a feasible way to utilize waste wool textiles for preparing magnetic biomass-based adsorbents for the removal of heavy metal ions from aqueous solutions.

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