scholarly journals Composite Polymeric Cryogel Cartridges for Selective Removal of Cadmium Ions from Aqueous Solutions

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1149 ◽  
Author(s):  
Sabina Huseynli ◽  
Monireh Bakhshpour ◽  
Tahira Qureshi ◽  
Muge Andac ◽  
Adil Denizli
Keyword(s):  
Aqueous Solutions ◽  
Removal Rate ◽  
Synthetic Wastewater ◽  
Maximum Adsorption Capacity ◽  
Functional Monomer ◽  
Hydroxyethyl Methacrylate ◽  
Characterization Methods ◽  
Ph Values ◽  
Adsorption Capacities ◽  
Wastewater Samples

In this study, composite polymeric cryogel cartridges were achieved by using Cd(II) imprinted poly(hydroxyethyl methacrylate N-methacryloly-(L)-cysteine methylester) beads and poly(hydroxyethyl methacrylate) cryogel cartridges with two different mole ratios of functional monomer. The N-methacryloly-(L)-cysteinemethylester was used as a functional monomer and Cd(II) 1:1 and 2:1, which were then notated as MIP1 and MIP2, respectively. Various characterization methods have confirmed the structural transformation on the MIP1 and MIP2 composite cryogel cartridges by scanning electron microscopy, Fourier-transform infrared spectroscopy-Attenuated Total Reflectance, and swelling tests. The maximum amount of Cd(II) adsorption with composite cryogel cartridges was determined by altering the Cd(II) initial concentration, temperature, and pH values. The maximum adsorption capacity of MIP1 and MIP2 composite cryogel cartridges obtained was 76.35 and 98.8 µmol/g of composite cryogels, respectively. The adsorption studies revealed that the MIP2 possessed a good adsorption performance for Cd(II). The obtained composite cryogel cartridges have a selective, reusable, and cost-friendly potential for the removal of Cd(II) from aqueous solutions, and are used many times without decreasing their adsorption capacities significantly. The Cd(II) removal rate of the MIP1 and MIP2 composite cryogel cartridges from synthetic wastewater samples was determined as 98.8%. The obtained cryogel cartridges’ adsorption material exhibited a good directional removal performance for Cd(II) from wastewater samples.

scholarly journals Utilization to Remove Pb (II) Ions from Aqueous Environments Using Waste Fish Bones by Ion Exchange

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Bayram Kizilkaya ◽  
A. Adem Tekınay
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Mechanism ◽  
Cost Effective ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Fish Bones ◽  
Adsorption Capacities ◽  
Aqueous Environments ◽  
Equilibrium Data ◽  
Pseudo Second Order

Removal of lead (II) from aqueous solutions was studied by using pretreated fish bones as natural, cost-effective, waste sorbents. The effect of pH, contact time, temperature, and metal concentration on the adsorption capacities of the adsorbent was investigated. The maximum adsorption capacity for Pb (II) was found to be 323 mg/g at optimum conditions. The experiments showed that when pH increased, an increase in the adsorbed amount of metal of the fish bones was observed. The kinetic results of adsorption obeyed a pseudo second-order model. Freundlich and Langmuir isotherm models were applied to experimental equilibrium data of Pb (II) adsorption and the value ofRLfor Pb (II) was found to be 0.906. The thermodynamic parameters related to the adsorption process such asEa,ΔG°,ΔH°, andΔS° were calculated andEa,ΔH°, andΔS° were found to be 7.06, 46.01 kJ mol−1, and 0.141 kJ mol−1K−1for Pb (III), respectively.ΔH° values (46.01 kJmol−1) showed that the adsorption mechanism was endothermic. Weber-Morris and Urano-Tachikawa diffusion models were also applied to the experimental equilibrium data. The fish bones were effectively used as sorbent for the removal of Pb (II) ions from aqueous solutions.

Novel Amphoteric Cryogels for Cd2+ Ions Removal from Aqueous Solutions

2018 ◽  
Vol 775 ◽  
pp. 376-382 ◽  
Author(s):  
Alzhan Baimenov ◽  
Dmitriy Berillo ◽  
Leila Abylgazina ◽  
Stavros G. Poulopoulos ◽  
Vassilis J. Inglezakis
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Chemical Structure ◽  
Nitrogen Adsorption ◽  
Maximum Adsorption Capacity ◽  
Cadmium Ions ◽  
Texture Analyzer ◽  
Ph Values ◽  
Amphoteric Properties ◽  
Scanning Electron

In this work, amphoteric cryogels based on N,N-dimethyl acrylamide, methacrylic acid and allylamine, crosslinked by N,N-methylenebisacrylamide were synthesized by free-radical polymerization in cryo-conditions. The synthesized cryogels were used for the removal of cadmium ions from aqueous solutions under different pH values. The chemical structure was studied by FTIR, porosity by nitrogen adsorption and morphology by scanning electron microscopy and texture analyzer. The amphoteric properties of cryogels were studied by zeta potential measurements. Adsorption tests revealed that cryogels exhibit 3 times higher adsorption capacity at pH 6.0 than at pH 4.0. The maximum adsorption capacity of the amphoteric cryogels for Cd2+ was 113 mg/g, at pH 6.0 and initial Cd2+ concentration 100 ppm. The results suggest that the predominant removal mechanism is ion exchange between sodium, which initially presents in the structure of the cryogel, and cadmium from the aqueous phase. Recovery studies suggested that the cryogels used can be regenerated and efficiently reused.

scholarly journals Characterization and Pb(II) removal potential of corn straw- and municipal sludge-derived biochars

2017 ◽  
Vol 4 (9) ◽  
pp. 170402 ◽  
Author(s):  
Shujuan Wang ◽  
Wei Guo ◽  
Fan Gao ◽  
Rui Yang
Keyword(s):  
Aqueous Solutions ◽  
Surface Complexation ◽  
Order Kinetic ◽  
Municipal Sludge ◽  
Corn Straw ◽  
Ph Values ◽  
Adsorption Capacities ◽  
Adsorption Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Corn straw- and municipal sludge-derived biochars (CS-BC and MS-BC, respectively) were used to remove Pb(II) from aqueous solutions. Despite being pyrolysed at the same temperature (723 K), MS-BC showed higher porosity and hydrophobicity than CS-BC. The optimum biochar loading and pH values allowing efficient Pb(II) removal (greater than 80%) were 0.2 g l −1 and 7.0, respectively. The presence of PO 4 3− (greater than 0.01 mol l −1 ) significantly affected the adsorptive performance of Pb(II) on the biochar samples. The adsorption data fitted well to a pseudo-second-order kinetic model and a Langmuir model, and the maximum Pb(II) adsorption capacities were 352 and 387 mg g −1 for CS-BC and MS-BC, respectively. The main mechanisms involved in the adsorption of Pb(II) on biochar were electrostatic attraction and surface complexation. When comparing both biochars, CS-BC showed better cost-effectiveness for the removal of Pb(II) from aqueous solutions.

Sulfonic Acid Functionalized Magnetite Nanoporous-KIT-6 for Removal of Methyl Green from Aqueous Solutions

2018 ◽  
Vol 52 ◽  
pp. 54-70 ◽  
Author(s):  
Seyedeh Mahsa Seyed Danesh ◽  
Hossein Faghihian ◽  
Shahab Shariati
Keyword(s):  
Aqueous Solutions ◽  
Sulfonic Acid ◽  
Mesoporous Silica Nanoparticles ◽  
Freundlich Isotherm ◽  
Maximum Adsorption Capacity ◽  
Methyl Green ◽  
Order Kinetic ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Wastewater Samples

The sulfonic acid-functionalized KIT-6 magnetite mesoporous silica nanoparticles (Fe3O4@SiO2@KIT-6-SO3H NPs) were prepared as an adsorbent and used for the removal of methyl green from aqueous solutions. Characterization of the obtained adsorbent was done by FT-IR, SEM and EDX instruments. According to the experimental results, about 96.4 % of dye was removed from aqueous solutions at the adsorbent amount of 3.2 g L-1at pH = 3 and ionic strength = 0 during 10 min. The kinetic results indicated that the pseudo-second-order kinetic model was the best model for describing the adsorption kinetic ( = 0.9999). The isotherm analysis demonstrated that the equilibrium data were well fitted to the Freundlich isotherm model, showing a multilayer adsorption of the dye on the adsorbent surface. The maximum adsorption capacity for methyl green was obtained 196 mg g-1. Furthermore, the Fe3O4@SiO2-KIT-6-SO3H NPs could be simply recovered by external magnet and it exhibited recyclability and reusability for six cycles. The results showed that the Fe3O4@SiO2-KIT-6-SO3H NPs are appropriate adsorbent for removal of methyl green from real wastewater samples.

The Preparation of TCAS-Loaded Resin and its Adsorption Property to Pb2+ Ion

2011 ◽  
Vol 396-398 ◽  
pp. 421-424
Author(s):  
Xiao Jun Hu ◽  
Pin Zhang ◽  
Yu Shuang Li
Keyword(s):  
Metal Ion ◽  
High Selectivity ◽  
Exchange Resin ◽  
Ph Value ◽  
Removal Rate ◽  
Adsorption Property ◽  
Maximum Adsorption Capacity ◽  
Adsorption Ability ◽  
Ph Values ◽  
Loaded Resin

A adsorbent for cadmium has been prepared by loading an anion-exchange resin with a novel supramolecular compound named thiacalix[4]arenetetrasulfonate (TCAS). The adsorption properties of Pb2+on TCAS-loaded resin had been studied and the effects of varying temperature, pH value, adsorption time and initial concentration. Batch extraction studies had revealed a high adsorption ability of the TCAS-loaded resin toward this heavy metal ion with high selectivity. The maximum adsorption capacity of the TCAS-loaded resin toward Pb2+ was 26.32 mg•g-1. The removal rate of Pb2+in water was up to 99% after 40min at 20°C when a 50mL aqueous solution of Pb2+(10 mg•L-1) was adsorbed by 0.5g TCAS-loaded resin. The removal percentage steadily retained above 99% when the pH values were in the range of 4 to 7. The adsorption isotherm of the TCAS-loaded resin to Pb2+ions fits well to linear form of Langmuir sorption equation.

scholarly journals Activated Carbon Loaded Ti3+ Self-Doped TiO2 Composite Material Was Prepared By Microwave Method and Degradation of Rhodamine B Under UV-Light

2021 ◽  
Author(s):  
Yingjie Xu ◽  
Qi Zhang ◽  
Guiyu Jiang ◽  
Hongying Xia ◽  
Wuchen Cai ◽  
...  
Keyword(s):  
Composite Material ◽  
Adsorption Capacity ◽  
Uv Light ◽  
Removal Rate ◽  
Crystal Form ◽  
Band Gap Energy ◽  
Maximum Adsorption Capacity ◽  
Microwave Method ◽  
Preparation Methods ◽  
Characterization Methods

Abstract In this work, the AC loaded Ti3+ self-doped TiO2 composite material was synthesized by the microwave method. Through XRD, XPS, SEM, RT-IR, UV-vis and other characterization methods to analyze the crystallinity, valence, morphology and other properties of the composite material. There is a synergistic effect between AC and TiO2, C—O—Ti and O—Ti—C bonds are formed between them. And promote the formation of anatase, make TiO2 form a mixed crystal form, and improve the efficiency of electron-hole separation. The doping of Ti3+ produces the Jahn-Teller effect, which reduces the band gap energy of the composite material to 2.2~2.4eV. The adsorption-catalysis experiment showed that the TiO2/Ti3+/AC composite prepared under microwave conditions has a removal rate of more than 96% for Rh-B, and the removal rate of pure TiO2/Ti3+ is only 50.44%. In addition, the effects of different preparation methods on the removal rate of Rh-B were compared. And it was found that the maximum removal rate of composite materials prepared under conventional conditions was 90.58%, which was significantly lower than the efficiency under microwave conditions. At the same time, the change in the adsorption capacity of AC was explored, and it was found that the saturated adsorption capacity of the 283K composite material was 161.67mg/g. When the temperature was 323K, the maximum adsorption capacity was 250.93mg/g, and the pure AC was only 115.47mg/g. Therefore, the composite material prepared by the microwave method can be regarded as an efficient and economical material for wastewater treatment.

scholarly journals Studies of Sorbent Efficiencies of Maize Parts in Fe(II) Removal from Aqueous Solutions

2017 ◽  
Vol 72 ◽  
pp. 1-8 ◽  
Author(s):  
Chidi Edbert Duru ◽  
Ijeoma Akunna Duru
Keyword(s):  
Aqueous Solutions ◽  
Functional Group ◽  
Sorption Process ◽  
Natural State ◽  
Optimum Conditions ◽  
Ph Values ◽  
Adsorption Capacities ◽  
Optimum Ph ◽  
Before And After ◽  
High Doses

The efficiency of the cob, sheath, seed chaff and stalk of maize plant in the removal of Fe(II) from aqueous solutions was studied. FTIR analysis of biomass surfaces before and after adsorption showed that seed chaff has the highest number of functional group coordination points. The percentage removal of Fe(II) increased with increase in pH for all the biomass parts with highest efficiency shown by the seed chaff at all the studied pH values. Metal up-take also increased with increase in seed chaff load. This direct relationship was however not shown by other parts where decreases in metal up-take were observed at high doses of the biomass. At optimum pH and biomass load, equilibrium adsorption capacities were reached in 30 minutes for all the parts. The efficiency of the biomass parts in the sorption process were in the order seed chaff>stalk>sheath>cob. At optimum conditions of the study, the seed chaff removed 73 % of Fe(II) from solution in its natural state.

Cobalt Ion Removal from Aqueous Solutions by Coal Fly Ash

2013 ◽  
Vol 864-867 ◽  
pp. 1732-1740
Author(s):  
Xiao Xu ◽  
Qiang Yang ◽  
Chao Yang Wang
Keyword(s):  
Fly Ash ◽  
Aqueous Solutions ◽  
Removal Rate ◽  
Coal Fly Ash ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Cobalt Ions ◽  
Freundlich Isotherms ◽  
Ion Removal ◽  
Low Concentrations

Cobalt ions, which are commonly found in low concentrations in industrial wastewater, are toxic, biocumulative, and hard to degrade. Therefore, the removal of these heavy metal ions from wastewater is highly important. The removal of Co (II) from aqueous solutions using untreated and alkali-modified coal fly ash was studied. The results for untreated fly ash show that the pseudo-second-order kinetic equation better fits the observed adsorption progress. The Langmuir and Freundlich isotherms could describe the reaction efficiently, and the maximum adsorption capacity for Co (II) was 237 mg·g-1at 20°C. Pretreating the fly ash with an alkali solution decreases the adsorption capability, possibly by destroying the zeolite structure. When the ratio of the fly ash dose and Co (II) concentration is between 40 and 60, the removal rate of Co (II) at a concentration of 20 mg·L-1reaches 99.95%.

scholarly journals Use of Lignite as a Low-Cost Material for Cadmium and Copper Removal from Aqueous Solutions: Assessment of Adsorption Characteristics and Exploration of Involved Mechanisms

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 164
Author(s):  
Salah Jellali ◽  
Ahmed Amine Azzaz ◽  
Mejdi Jeguirim ◽  
Helmi Hamdi ◽  
Ammar Mlayah
Keyword(s):  
Aqueous Solutions ◽  
Low Cost ◽  
X Ray Diffraction ◽  
High Adsorption ◽  
Experimental Conditions ◽  
X Ray ◽  
Ph Values ◽  
Adsorption Capacities ◽  
Or Groups ◽  
Pseudo Second Order

Lignite, as an available and low-cost material, was tested for cadmium (Cd) and copper (Cu) removal from aqueous solutions under various static experimental conditions. Experimental results showed that the removal efficiency of both metals was improved by increasing their initial concentrations, adsorbent dosage and aqueous pH values. The adsorption kinetic was very rapid for Cd since about 78% of the totally adsorbed amounts were removed after a contact time of only 1 min. For Cd and Cu, the kinetic and isothermal data were well fitted with pseudo-second order and Freundlich models, respectively, which suggests that Cd/Cu removal by lignite occurs heterogeneously on multilayers surfaces. The maximum Langmuir’s adsorption capacities of Cd and Cu were assessed to 38.0 and 21.4 mg g−1 and are relatively important compared to some other lignites and raw natural materials. Results of proximate, scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS), Fourier transform infrared spectroscopy (FTIR) and X-Ray diffraction (XRD) showed that the removal of these metals occurs most likely through a combination of cation exchange and complexation with specific functional groups. The relatively high adsorption capacity of the used lignite promotes its future use as a low cost material for Cd and Cu removal from effluents, and possibly for other heavy metals or groups of pollutants.

scholarly journals Photocatalytic degradation of ethyl paraben wastewater by mixed crystal molecularly imprinted TiO2

2021 ◽  
Vol 261 ◽  
pp. 02025
Author(s):  
Liangxiao Zhang ◽  
Lei Zhu ◽  
Xun Wang ◽  
Xiumei Tao ◽  
Xian Liu
Keyword(s):  
Mixed Crystal ◽  
Removal Rate ◽  
Sol Gel ◽  
Tetrabutyl Titanate ◽  
Template Molecule ◽  
Molecularly Imprinted ◽  
Characterization Methods ◽  
Molecular Weights ◽  
Ph Values ◽  
Ft Ir

Using ethyl paraben as the template molecule and n-tetrabutyl titanate as the titanium source, the molecularly imprinted titanium dioxide (MIP-TiO2) photocatalyst was prepared by the sol-gel method. The effects of different pH values, imprinting molecular weights and other factors on the degradation of ethyl paraben were studied, and the materials were analyzed by TEM, XRD, FT-IR and other characterization methods. The results show that the catalyst has a mixed crystal structure in which anatase and rutile ore coexist, and the rutile ore content of MIP-TiO2 is calculated to be 78.5%. Catalytic degradation of ethyl paraben by reacting for 40 min under ultraviolet light, the removal rate of ethyl paraben by pure TiO2 is 80.74%, and the removal rate of ethyl paraben by MIP-TiO2 can reach 96.27%. MIP-TiO2 is 15.53% higher than TiO2. MIP-TiO2 has imprinting holes, which can target the target pollutants and effectively improve the selectivity of the photocatalyst MIP-TiO2. The selectivity factor of MIP-TiO2 is 1.69 times that of TiO2.

Sign in / Sign up

Export Citation Format

Share Document