scholarly journals In Situ Preparation of Novel Porous Nanocomposite Hydrogel as Effective Adsorbent for the Removal of Cationic Dyes from Polluted Water

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3002 ◽  
Author(s):  
Badr M. Thamer ◽  
Ali Aldalbahi ◽  
Meera Moydeen A. ◽  
Mohamed H. El-Newehy
Keyword(s):  
Linear Models ◽  
Adsorption Process ◽  
Ph Value ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Polymerization Process ◽  
Polluted Water ◽  
Swelling Properties ◽  
Hydrogel Nanocomposite

The use of some hydrogels as adsorbents for pollutants removal from wastewater is limited due to their high swelling properties and the difficulty in recovering them after the adsorption process. To overcome these problems, a new hydrogel nanocomposite based on chitosan-grafted-polyacrylic acid/oxidized electrospun carbon nanofibers (CT-g-PAA/O-ECNFs) was prepared by an in situ grafting polymerization process. The prepared hydrogel nanocomposite was used as a novel effective and highly reusable adsorbent for the removal of methylene blue (MB) from polluted water with low cost. The morphology and the structure of CT-g-PAA/O-ECNFs were investigated by numerous techniques. The effect of incorporating O-ECNFs on the swelling capability of the prepared hydrogel was explored in distillated water and MB solution at normal pH. The effect of parameters including ratio of O-ECNFs, contact time, pH, initial concentration, and temperature on adsorption process were explored. The adsorption isotherm and kinetic were studied by numerous non-linear models. The obtained results confirmed that the incorporation of O-ECNFs into the hydrogel network decreased the swelling capacity and improved its ability towards MB dye removal. The adsorption process depended on the pH value of the dye solution. Additionally, the adsorption and kinetic results were fitted using the Freundlich isotherm model and pseudo second order model (PSO), respectively. Moreover, the new adsorbents can be recycled for at least five cycles keeping its adsorption capacity and can be easily recovered without loss in its initial weight.

Enhanced coagulation with in situ manganese dioxide on removal of humic acid in micro-polluted water

2015 ◽  
Vol 72 (3) ◽  
pp. 406-414
Author(s):  
Yubin Zeng ◽  
Ziyang Zeng ◽  
Junlin Wang
Keyword(s):  
Humic Acid ◽  
Manganese Dioxide ◽  
Ph Value ◽  
Orthogonal Experiment ◽  
Surface Characteristics ◽  
Polluted Water ◽  
Enhanced Coagulation ◽  
Total Solids ◽  
Solids Content

The morphology and surface characteristics of manganese dioxide (MnO2) formed in situ, which was prepared through the oxidation of MnSO4 using KMnO4, were studied. The effects of factors including the form of MnO2, dosage, pH, dosing sequence of in situ MnO2 on the enhanced coagulation were systematically evaluated. The results of analysis by the UV254 and permanganate index CODMn methods indicated that humic acid removal increased from 9.2 and 2.5% to 55.0 and 38.9%, when 10 mg/L of the in situ MnO2 was added in the presence of 2 mg/L of polyaluminum sulfate. The studies of orthogonal experiment revealed that coagulation was most affected by the pH, whereas the dosage of in situ MnO2 and slow stirring duration exhibited a weaker effect. At a pH value of 4.0, in situ MnO2 dosage of 10 mg/L, slow stir over 40 min, and the total solids content was 20 mg/L, the humic acid removal by UV254 and CODMn methods reached 71.2 and 61.2%. These results indicated that the presence of in situ MnO2 enhanced the coagulation and removal of humic acid from water.

scholarly journals Removal of lead from aqueous solutions by low cost and waste biosorbents (lemon, bean and artichoke shells)

2020 ◽  
Vol 81 (1) ◽  
pp. 159-169
Author(s):  
Feyza Ergüvenerler ◽  
Şerif Targan ◽  
Vedia Nüket Tirtom
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Low Cost ◽  
Standard Free Energy ◽  
Freundlich Isotherm ◽  
Standard Entropy ◽  
X Ray ◽  
Adsorption Capacities ◽  
Influence Of Ph ◽  
Scanning Electron

Abstract Simple, fast, effective, low cost and waste biosorbents, lemon, bean and artichoke shells, were used to remove lead (II) ions from aqueous solution. The influence of pH, contact time, temperature and lead (II) concentration of the removal process was investigated. The sufficient contact time was deemed 10 minutes for bean and artichoke shells and 60 minutes for lemon shells for Pb(II) ions. The thermodynamic parameters, such as standard free energy (ΔG), standard enthalpy (ΔH), and standard entropy (ΔS) of the adsorption process were calculated as −5.6786, −5.5758, −3.1488 kJmol−1 for ΔG, −7.2791, −20.285, −9.5561 kJ mol−1 for ΔH, −0.00545, −0.05017, −0.02185 kJ mol−1 K−1 for ΔS, respectively, for lemon, artichoke and bean shells. Maximum adsorption capacities of lead (II) were observed as 61.30 mg g−1, 88.5 mg g−1 and 62.81 mg g−1, respectively, for lemon, bean and artichoke shells according to the Freundlich isotherm model at 20 °C. Scanning electron microscope (SEM) and energy-dispersive X-ray detector (EDX) were used to characterize the surface morphology of the adsorbents. Consequently, Pb(II) removal using lemon, bean and artichoke shells would be an effective method for the economic treatment of wastewater.

scholarly journals Construction of Novel Polymerizable Ionic Liquid Microemulsions and the In Situ Synthesis of Poly(Ionic Liquid) Adsorbents

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 454 ◽  
Author(s):  
Aili Wang ◽  
Shuhui Li ◽  
Hou Chen ◽  
Ying Liu ◽  
Xiong Peng
Keyword(s):  
Ionic Liquid ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
In Situ Synthesis ◽  
Scattering Data ◽  
Order Kinetic ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Poly Ionic Liquid

This paper reports the successful construction of novel polymerizable ionic liquid microemulsions and the in situ synthesis of poly(ionic liquid) adsorbents for the removal of Zn2+ from aqueous solution. Dynamic light-scattering data were used to confirm the polymerization media and to illustrate the effect of the crosslinker dosage on the droplet size of the microemulsion. FTIR and thermal analysis were employed to confirm the successful preparation of the designed polymers and characterize their thermostability and glass transition-temperature value. The optimization of the adsorption process indicates that the initial concentration of Zn2+, pH, adsorbent dosage and contact time affected the adsorption performance of poly(ionic liquid)s toward Zn2+. Furthermore, our research revealed that the adsorption process can be effectively described by the pseudo second-order kinetic model and the Freundlich isotherm model.

scholarly journals Efficient Absorption of Antibiotic from Aqueous Solutions over MnO2@SA/Mn Beads and Their In Situ Regeneration by Heterogeneous Fenton-Like Reaction

2017 ◽  
Vol 2017 ◽  
pp. 1-13
Author(s):  
Yu Luo ◽  
Bo Bai ◽  
Honglun Wang ◽  
Yourui Suo ◽  
Yiliang Yao
Keyword(s):  
Adsorption Process ◽  
Low Cost ◽  
Physical Structure ◽  
Absorption Efficiency ◽  
Practical Application ◽  
Heterogeneous Fenton ◽  
Adsorptive Removal ◽  
Absorption Kinetic ◽  
Isotherm Equations

Alginate has been extensively used as absorbents due to its excellent properties. However, the practical application of pure alginate has been restricted since the saturated adsorbent has weak physical structure and could not be regenerated easily. In this study, a low-cost and renewable composite MnO2@alginate/Mn adsorbent has been prepared facilely for the absorptive removal of antibiotic wastewater. FE-SEM, FTIR, and XRD analyses were used to characterize the samples. The norfloxacin (NOR) was used as an index of antibiotics. More specifically, the batch absorption efficiency of the adsorbents was evaluated by pH, contact time with different NOR concentration, and the temperature. Thus, the performance of absorption kinetic dynamics and isotherm equations were estimated for the adsorptive removal process. Parameters includingΔG0,ΔH0, andΔS0were utilized to describe the feasible adsorption process. To regenerate the saturated absorptive sites of the adsorbent, the heterogeneous Fenton-like reactions were trigged by introduction of H2O2. The results showed that the in situ regenerating has exhibited an excellent recycling stability. The high activity and the simple fabrication of the adsorbents make them attractive for the treatment of wastewater containing refractory organic compound and also provide fundamental basis and technology for further practical application.

scholarly journals Super and Selective Adsorption of Cationic Dyes onto Carboxylate-Modified Passion Fruit Peel Biosorbent

2021 ◽  
Vol 9 ◽  
Author(s):  
Kaiwei Chen ◽  
Linlin Du ◽  
Peng Gao ◽  
Junli Zheng ◽  
Yuanli Liu ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Selective Adsorption ◽  
Low Cost ◽  
Methyl Violet ◽  
Passion Fruit ◽  
Cationic Dyes ◽  
Polluted Water ◽  
Isotherm Models ◽  
Fruit Peel ◽  
Environmental Friendliness

The carboxylate-functionalized passion fruit peel (PFPCS) was an efficient and rapid biosorbent for wastewater treatment. The PFPCS exhibited excellent selectivity to the cationic dyes, where the maximum adsorption capacities for methylene blue (MB) and methyl violet (MV) were 1,775.76 mg g−1 and 3,756.33 mg g−1, respectively. And the adsorption process of MB and MV on PFPCS reached equilibrium within 20 min. Moreover, the adsorption conditions and mechanisms were investigated. The adsorption process was in good agreement with the pseudo-second-order and Langmuir isotherm models. The adsorption mechanism was also proposed to be electrostatic interaction and hydrogen bond. After six cycles of desorption-adsorption, the removal efficient of MB and MV could be kept above 95%. Thus, PFPCS was considered as a highly efficient absorbent for removing cationic dyes from polluted water due to excellent adsorption characteristics, low cost and environmental friendliness.

Comparative MCDM Analysis for AMD Treatment Method Selection

2021 ◽  
Author(s):  
Zoran Štirbanović ◽  
Vojka Gardić ◽  
Dragiša Stanujkić ◽  
Radmila Marković ◽  
Jovica Sokolović ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Metal Ions ◽  
Adsorption Process ◽  
Mine Drainage ◽  
Ph Value ◽  
Low Cost ◽  
Treatment Method ◽  
Passive Treatment ◽  
Copper Production ◽  
Capital Costs

Abstract Robule Lake is located in Eastern Serbia, near city of Bor, known for copper production, and it is being influenced by waste materials from mining activities. For the purification of water from Robule Lake, contaminated with various metal ions (Fe, Cu, Zn, Mn, Cd, Ni, etc.), acid mine drainage (AMD) treatment methods such as: passive treatment method, sequential neutralization, ion exchange, adsorption process based on low cost adsorbents, adsorption process based on natural zeolits, electrodialysis, filtration with nanofiltration membranes, and reverse osmosis, were evaluated by following MCDM methods: TOPSIS, VIKOR, MOOSRA; WASPAS, and CoCoSo. Criteria used for the evaluation were: efficiency in the metal ions removal and the quality of the purified water, necessity of pre-treatment and / or post-treatment of treated water, possibility of using the generated waste, capital costs, operating and maintenance costs, needed area, and sensitivity of the method. The results of the MCDM analysis showed that sequential neutralization was the most appropriate for this wastewater, while passive treatment system and ion exchange were ranked as second and third, respectively.After the selection of AMD treatment method, neutralization tests with lime were carried out on the water sample from Robule Lake. The results of sequential neutralization testing showed that concentration of Fe ions could be lowered below the maximal allowable concentration prescribed by Serbian legislation at pH value 4. The other metal ions: Cu, Zn, and Ni needed pH value 7, and Mn and Cd needed pH 10 for effective removal.

scholarly journals Chromium(III) Removal from Wastewater by Chitosan Flakes

2020 ◽  
Vol 10 (6) ◽  
pp. 1925 ◽  
Author(s):  
Loris Pietrelli ◽  
Iolanda Francolini ◽  
Antonella Piozzi ◽  
Maria Sighicelli ◽  
Ilaria Silvestro ◽  
...  
Keyword(s):  
Metal Ions ◽  
Environmental Remediation ◽  
Ethylenediaminetetraacetic Acid ◽  
Low Cost ◽  
Preliminary Investigation ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Ion Competition ◽  
Batch Tests

Chitosan is very effective in removing metal ions through their adsorption. A preliminary investigation of the adsorption of chromium(III) by chitosan was carried out by means of batch tests as a function of contact time, pH, ion competition, and initial chromium(III) concentration. The rate of adsorption was rather rapid (t1/2 < 18 min) and influenced by the presence of other metal ions. The obtained data were tested using the Langmuir and Freundlich isotherm models and, based on R2 values, the former appeared better applicable than the latter. Chitosan was found to have an excellent loading capacity for chromium(III), namely 138.0 mg Cr per g of chitosan at pH = 3.8, but metal ions adsorption was strongly influenced by the pH. About 76% of the recovered chromium was then removed simply by washing the used chitosan with 0.1 M EDTA (Ethylenediaminetetraacetic acid) solution. This study demonstrates that chitosan has the potential to become an effective and low-cost agent for wastewater treatment (e.g., tannery waste) and in situ environmental remediation.

Adsorption performance and mechanism for removal of Cd(II) from aqueous solutions by D001 cation-exchange resin

2013 ◽  
Vol 69 (4) ◽  
pp. 833-839 ◽  
Author(s):  
Yuqiang Zheng ◽  
Chunhua Xiong ◽  
Caiping Yao ◽  
Fangyong Ye ◽  
Jianxiong Jiang ◽  
...  
Keyword(s):  
Ph Value ◽  
Low Cost ◽  
Cation Exchange Resin ◽  
Freundlich Isotherm ◽  
Breakthrough Curves ◽  
Spectroscopic Technique ◽  
Study Data ◽  
Column Studies ◽  
Batch Studies ◽  
Adsorption Condition

The adsorption and desorption properties of D001 resin for Cd(II) has been investigated. Batch studies were carried out with various pH, contact time, temperature and initial concentrations, and then column studies were conducted. The results showed that the optimal adsorption condition was at pH value of 3.0 in HAc-NaAc medium. The resin exhibited a high Cd(II) uptake of 185.8 mg/g at 298 K. The apparent activation energy Ea is 5.05 kJ/mol and the sorption thermodynamic parameters are ΔH = 21.1 kJ/mol, ΔS = 0.122 kJ/(mol K) and ΔG298K = −15.3 kJ/mol, which indicated that the adsorption process was spontaneous and endothermic. Compared with the Freundlich isotherm, the sorption of Cd(II) obeys the Langmuir isotherm better. The Thomas model was delineated here to predict the breakthrough curves based on the experimental column study data. Furthermore, the resin could be regenerated through the desorption of the Cd(II) anions using 1 mol/L HCl solution and could be reused to adsorb again. The infrared spectroscopic technique was undertaken. Compared with other absorbents, D001 resin was relatively low cost and was effective in removing Cd(II) ions.

scholarly journals Utilization of a Newly Developed Nanomaterial Based on Loading of Biochar with Hematite for the Removal of Cadmium Ions from Aqueous Media

2021 ◽  
Vol 13 (4) ◽  
pp. 2191
Author(s):  
Tunzeel Iqbal ◽  
Shahid Iqbal ◽  
Fozia Batool ◽  
Dimitrios Thomas ◽  
Malik Muhammad Hassnain Iqbal
Keyword(s):  
Metal Ions ◽  
Adsorption Process ◽  
Low Cost ◽  
Aqueous Media ◽  
Freundlich Isotherm ◽  
Batch Adsorption ◽  
Type I ◽  
Process Data ◽  
Desorption Process ◽  
Saccharum Munja

In order to conserve the energy used for remediation of harmful metals from aqueous media, an adsorption process was performed. It is efficient and low-cost method with zero carbon emissions as compared to other methods. A hematite-based novel nanomaterial loaded onto biochar was utilized for the remediation of toxic cadmium metal ions from aqueous media. Saccharum munja has been employed as low-cost feedstock to prepare the biochar. Three adsorbents i.e., raw Saccharum munja (SM), Saccharum munja biochar (SMBC) and hematite-loaded Saccharum munja bichar (HLSMBC) were used in batch adsorption tests to study uptake of metal ions by optimizing the experimental parameters. Experimental data and calculated results revealed maximum sorption efficiency of Cd(II) removal was given by HLSMBC (72 ppm) and SMBC (67.73 ppm) as compared with SM (48.7 ppm). Among adsorption isotherms applied on work best fit for Cd(II) adsorption on SM was found for a Freundlich isotherm with high values of correlation coefficient R2 ≥ 0.9 for all sorbents and constant 1/n values between 0–1. Equilibrium results were evaluated using five different types of errors functions. Thermodynamic studies suggested feasible, spontaneous and endothermic nature of adsorption process, while, the ∆H parameter < 80 kJ/mol indicated physiosorption and positive ∆S values promoted randomness of ions with increase in adsorption process. Data fitted into type I of pseudo second order kinetics having R2 ≥ 0.98 and rate constants K2 (0–1). Desorption process was also performed for storage, conservation and reuse of sorbent and sorbate materials.

scholarly journals Selective Adsorption of CR (VI) onto Amine-Modified Passion Fruit Peel Biosorbent

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 790
Author(s):  
Xiaolei Zhao ◽  
Junli Zheng ◽  
Shaohong You ◽  
Chongmin Liu ◽  
Linlin Du ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Ph Value ◽  
Selective Adsorption ◽  
Low Cost ◽  
Passion Fruit ◽  
World Health ◽  
Fruit Peel ◽  
Adsorption Performance ◽  
Safe Level ◽  
Ft Ir

This study aimed to prepare surface amino-riched passion fruit peel (DAPFP) by amination reaction with low-cost biomaterials and use it as a biosorbent to adsorb Cr (VI). The specific physicochemical and structural properties of DAPFP were characterized by SEM, EDS, XRD, TG, Zeta, XPS, and FT-IR. The effects of pH value, initial concentration, adsorption time, coexisting ions, and temperature on the adsorption of Cr (VI) were systematically investigated. The results showed that within 90 min, DAPFP could reduce the concentration of Cr (VI) solution (1 mg/L−1) to an allowable safe level of drinking water (0.05 mg/L−1) specified by the World Health Organization. The adsorption process complies with pseudo-second-order kinetics and the Langmuir isotherm model. The adsorption capacity of the prepared biosorbent could reach 675.65 mg/g−1. The results of thermodynamic studies confirmed that the adsorption process was a self-discharging heat process. DAPFP also showed good reusability; even after being used repeatedly five times, it still showed excellent adsorption performance. FT-IR and XPS analyses showed that electrostatic attraction and reduction were the main reasons for the adsorption. By virtue of its low cost and excellent adsorption performance, DAPFP has a potential practical application as an adsorbent in treating Cr (VI) containing wastewater.

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