scholarly journals Preparation of polyethyleneimine modification of flower molybdenum disulfide composite(PEI/MoS2) adsorbent and studying it enriched and reduction property for hexavalent chromium from wastewater

2021 ◽  
Author(s):  
Miao Shan Tang ◽  
Jian hua Chen ◽  
JingMei Wang ◽  
Qiao Jing Lin ◽  
Li Jun Fang
Keyword(s):  
Molybdenum Disulfide ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Ion Concentration ◽  
Solution Ph ◽  
Composite Adsorbents ◽  
Reduction Property ◽  
Adsorption Temperature ◽  
Surface Modified ◽  
Adsorption Desorption

Abstract In this study, flower molybdenum disulfide (MoS2) was surface-modified with polyethyleneimine(PEI) to prepare PEI/MoS2 composite adsorbents for Cr(VI) enrichment in aqueous solution. The physicochemical properties of PEI/MoS2 were characterized by SEM, TEM, XRD, FTIR, BET and XPS methods. The influences of PEI loading, solution pH, contact time, adsorption temperature, and initial Cr(VI) ion concentration on the adsorption performance of PEI/MoS2 for Cr(VI) were investigated. Under the optimal conditions, and the initial Cr(VI) ion concentration is 50 mg L− 1, the adsorption capacity of PEI/MoS2 is 120.7 mg g− 1. The adsorption rate is fast, equilibrium time is 6 h. Competitive adsorption studies of the Cr(VI), Co(II), Zn(II) and Cd(II) quaternion system were also investigated, the results indicated that selectively adsorbed amount of Cr(VI) on PEI/MoS2 is significantly higher than that of Co(II), Zn(II) and Cd(II) ions. The adsorption process was spontaneous and conformed to Freundlich isotherm and pseudo-second kinetic model. The consecutive adsorption-desorption experiments indicated that the PEI/MoS2 has excellent reusability.

scholarly journals Characterization of Residual Biomasses and Its Application for the Removal of Lead Ions from Aqueous Solution

2019 ◽  
Vol 9 (21) ◽  
pp. 4486 ◽  
Author(s):  
Candelaria Tejada-Tovar ◽  
Angel Darío Gonzalez-Delgado ◽  
Angel Villabona-Ortiz
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
High Surface ◽  
High Surface Area ◽  
Freundlich Isotherm ◽  
Mesoporous Structure ◽  
Isotherm Models ◽  
Solution Ph ◽  
Batch Mode ◽  
Suitable Alternative

The removal of water pollutants has been widely addressed for the conservation of the environment, and novel materials are being developed as adsorbent to address this issue. In this work, different residual biomasses were employed to prepare biosorbents applied to lead (Pb(II)) ion uptake. The choice of cassava peels (CP), banana peels (BP), yam peels (YP), and oil palm bagasse (OPB) was made due to the availability of such biomasses in the Department of Bolivar (Colombia), derived from agro-industrial activities. The materials were characterized by ultimate and proximate analysis, Fourier Transform Infrared Spectroscopy (FTIR), Brunauer-Emmett-Teller analysis (BET), Scanning Electron Microscopy (SEM), and Energy Dispersive X-Ray Spectroscopy (EDS) in order to determine the physicochemical properties of bioadsorbents. The adsorption tests were carried out in batch mode, keeping the initial metal concentration at 100 ppm, temperature at 30 °C, particle size at 1 mm, and solution pH at 6. The experimental results were adjusted to kinetic and isotherm models to determine the adsorption mechanism. The remaining concentration of Pb(II) in solution was measured by atomic absorption at 217 nm. The functional groups identified in FTIR spectra are characteristic of lignocellulosic materials. A high surface area was found for all biomaterials with the exception of yam peels. A low pore volume and size, related to the mesoporous structure of these materials, make these bioadsorbents a suitable alternative for liquid phase adsorption, since they facilitate the diffusion of Pb(II) ions onto the adsorbent structure. Both FTIR and EDS techniques confirmed ion precipitation onto adsorbent materials after the adsorption process. The adsorption tests reported efficiency values above 80% for YP, BP, and CP, indicating a good uptake of Pb(II) ions from aqueous solution. The results reported that Freundlich isotherm and pseudo-second order best fit experimental data, suggesting that the adsorption process is governed by chemical reactions and multilayer uptake. The future prospective of this work lies in the identification of alternatives to reuse Pb(II)-contaminated biomasses after heavy metal adsorption, such as material immobilization.

Removal of fluoride from aqueous solution by adsorption onto Kanuma mud

2010 ◽  
Vol 62 (8) ◽  
pp. 1888-1897 ◽  
Author(s):  
Nan Chen ◽  
Zhenya Zhang ◽  
Chuanping Feng ◽  
Miao Li ◽  
Rongzhi Chen ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Fluoride Concentration ◽  
Freundlich Isotherm ◽  
Order Kinetic ◽  
Solution Ph ◽  
Intra Particle Diffusion ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Solid Liquid Interface ◽  
Solid Liquid

Kanuma mud, a geomaterial, is used as an adsorbent for the removal of fluoride from water. The influences of contact time, solution pH, adsorbent dosage, initial fluoride concentration and co-existing ions were investigated by batch equilibration studies. The rate of adsorption was rapid with equilibrium being attained after about 2 h, and the maximum removal of fluoride was obtained at pH 5.0–8.0. The Freundlich isotherm model was found to represent the measured adsorption data well. The negative value of the thermodynamic parameter ΔG suggests the adsorption of fluoride by Kanuma mud was spontaneous, the endothermic nature of adsorption was confirmed by the positive ΔH value. The negative ΔS value for adsorbent denoted decreased randomness at the solid/liquid interface. The adsorption process using Kanuma mud followed the pseudo-second-order kinetic model. Fluoride uptake by the Kanuma mud was a complex process and intra-particle diffusion played a major role in the adsorption process. It was found that adsorbed fluoride could be easily desorbed by washing the adsorbent with a solution of pH 12. This indicates the material could be easily recycled.

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 Activated Carbon Impregnated by Zero-Valent Iron Nanoparticles (AC/nZVI) Optimized for Simultaneous Adsorption Furfural: Green Synthesis, Regeneration, Characterization, and Adsorption-Desorption Studies

2021 ◽  
Author(s):  
Yousef Rashtbari ◽  
Shirin Afshin ◽  
Asghar Hamzezadeh ◽  
Soumya Ghosh ◽  
Ayoob Rastegar ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Iron Nanoparticles ◽  
Adsorption Process ◽  
Surface Adsorption ◽  
Optimal Conditions ◽  
Solution Ph ◽  
Structure And Morphology ◽  
Carbon Coated ◽  
Zero Valent Iron Nanoparticles ◽  
Adsorption Desorption

Abstract Furfural is an organic aromatic compound that has attracted considerable interest as a potential chemical for the production of biochemical and biofuels. However, furfural has proved to possess ecotoxic effect on the environment and to humans, therefore measures are required to prevent these effects. One of the most widely used methods for eliminating furfural is the surface adsorption process.The present study focused on the structure and morphology of the composite nanoparticles, investigated using FTIR, XRD, BET and FE-SEM techniques.Furthermore, the variables of time, solution pH, dosage composite and initial furfural were evaluated. Furfural adsorption was performed by spectrophotometer at a wavelength of 227 nm. The removal efficiency under optimal conditions for furfural (Furfural concentration of 250 mg/L, the composite dose of 4 g/L, the reaction time of 60 min and pH = 7) was 81.46%. In addition, the study of isotherm and adsorption kinetics for furfural showed that the adsorption process follows the Langmuir isotherm and quasi-quadratic kinetics. The qmax of the composite was determined by the Langmuir model of222.22 mg/g. Therefore, the present study exclusively showedthat the activated carbon coated with nZVI nanoparticles used as an effective and environmentally friendly adsorbent for furfural removal from aqueous solutions. Furthermore, this study could possibly have applied for the adsorbtion of other chemical cmpounds such as dyes,metronidazole,aniline.

scholarly journals Removal Of Lead (Pb2+) From Aqueous Solutions By Natural Bentonite

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
Wahyu Wilopo ◽  
Doni Prakasa Eka Putra ◽  
I Wayan Warmada ◽  
Tsuyoshi Hirajima
Keyword(s):  
Aqueous Solution ◽  
Grain Size ◽  
Adsorption Process ◽  
Exchange Process ◽  
Freundlich Isotherm ◽  
Exchange Capacity ◽  
Ion Concentration ◽  
Lead Ions ◽  
Lead Ion ◽  
Batch Adsorption

The aim of the present work is to investigate the ability of natural bentonite (untreated) from Pacitan, East Java to remove lead ions from aqueous solution. The bentonite has specific surface area and cation exchange capacity of 27.52 m2 g−1 and 65.20 meq/100 gr of bentonite, respectively. Towards this aim, batch adsorption experiments were carried out and the effect of various parameters on this removal process has been investigated. The effects of pH, grain size of bentonite, adsorption time and lead ion concentration on the adsorption process were examined. The optimum pH for adsorption was found to be 9, with the finer grain size of bentonite is more effective. In adsorption studies, residual lead ions concentration reached equilibrium in a duration of 24 hours. Adsorption of lead on bentonite appeared to follow Freundlich isotherm. Our results demonstrate that the adsorption process was mostly dominated by ion exchange process. Keywords: Removal, lead, aqueous solution, natural bentonite, adsorption.

scholarly journals Nano-Size Biomass Derived from Pomegranate Peel for Enhanced Removal of Cefixime Antibiotic from Aqueous Media: Kinetic, Equilibrium and Thermodynamic Study

2020 ◽  
Vol 17 (12) ◽  
pp. 4223 ◽  
Author(s):  
Mehdi Esmaeili Bidhendi ◽  
Zahra Poursorkh ◽  
Hassan Sereshti ◽  
Hamid Rashidi Nodeh ◽  
Shahabaldin Rezania ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Physical Adsorption ◽  
Chemical Activation ◽  
Aqueous Media ◽  
Freundlich Isotherm ◽  
Maximum Adsorption Capacity ◽  
Effective Parameters ◽  
Thermodynamic Models ◽  
Solution Ph ◽  
Pomegranate Peel

Nano-sized activated carbon was prepared from pomegranate peel (PG-AC) via NaOH chemical activation and was fully characterized using BET, FT-IR, FE-SEM, EDX, and XRD. The newly synthesized PG-AC was used for cefixime removal from the aqueous phase. The effective parameters on the adsorption process, including solution pH (2–11), salt effect (0–10%), adsorbent dosage (5–50 mg), contact time (5–300 min), and temperature (25–55 °C) were examined. The experimental adsorption equilibrium was in close agreement with the type IV isotherm model set by the International Union of Pure and Applied Chemistry (IUPAC). The adsorption process was evaluated with isotherm, kinetic, and thermodynamic models and it is were well fitted to the Freundlich isotherm (R2 = 0.992) and pseudo-second-order model (R2 = 0.999). The Langmuir isotherm provided a maximum adsorption capacity of 181.81 mg g−1 for cefixime uptake onto PG-AC after 60 min at pH 4. Hence, the isotherm, kinetic and thermodynamic models were indicated for the multilayer sorption followed by the exothermic physical adsorption mechanism.

scholarly journals Removal of Methylene Blue Dye from Wastewater Using Periodiated Modified Nanocellulose

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Hizkeal Tsade Kara ◽  
Sisay Tadesse Anshebo ◽  
Fedlu Kedir Sabir ◽  
Getachew Adam Workineh
Keyword(s):  
Methylene Blue ◽  
Adsorption Process ◽  
Dye Adsorption ◽  
Freundlich Isotherm ◽  
Color Removal ◽  
Isotherm Models ◽  
Blue Dye ◽  
Solution Ph ◽  
X Ray ◽  
Pseudo Second Order

The study was focused on the preparation and characterizations of sodium periodate-modified nanocellulose (NaIO4-NC) prepared from Eichhornia crassipes for the removal of cationic methylene blue (MB) dye from wastewater (WW). A chemical method was used for the preparation of NaIO4-NC. The prepared NaIO4-NC adsorbent was characterized by using X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscope (SEM), energy-dispersive X-ray (EDX), and Brunauer–Emmett–Teller (BET) instruments. Next, it was tested to the adsorption of MB dye from WW using batch experiments. The adsorption process was performed using Langmuir and Freundlich isotherm models with maximum adsorption efficiency (qmax) of 90.91 mg·g−1 and percent color removal of 78.1% at optimum 30 mg·L−1, 60 min., 1 g, and 8 values of initial concentration, contact time, adsorbent dose, and solution pH, respectively. Pseudo-second-order (PSO) kinetic model was well fitted for the adsorption of MB dye through the chemisorption process. The adsorption process was spontaneous and feasible from the thermodynamic study because the Gibbs free energy value was negative. After adsorption, the decreased values for physicochemical parameters of WW were observed in addition to the color removal. From the regeneration study, it is possible to conclude that NaIO4-NC adsorbent was recyclable and reused as MB dye adsorption for 13 successive cycles without significant efficient loss.

scholarly journals Studies on the Removal of Cadmium Toxic Metal Ions by Natural Clays from Aqueous Solution by Adsorption Process

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Rajaa Bassam ◽  
Achraf El hallaoui ◽  
Marouane El Alouani ◽  
Maissara Jabrane ◽  
El Hassan El Khattabi ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Process ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Toxic Metal ◽  
Ion Concentration ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Solution Ph ◽  
Natural Clays

The aim of this study is the valorization of the Moroccan clays (QC-MC and QC-MT) from the Middle Atlas region as adsorbents for the treatment of water contaminated by cadmium Cd (II) ions. The physicochemical properties of natural clays are characterized by ICP-MS, XRD, FTIR, and SEM techniques. The adsorption process is investigated as a function of adsorbent mass, solution pH, contact time, temperature, and initial Cd (II) ion concentration. The kinetic investigation shows that the adsorption equilibrium of Cd (II) ions by both natural clays is reached after 30 min for QC-MT and 45 min for QC-MC and fits well to a pseudo-second-order kinetic model. The isotherm study is best fitted by a Freundlich model, with the maximum adsorption capacity determined by the linear form of the Freundlich isotherm being 4.23 mg/g for QC-MC and 5.85 mg/g for QC-MT at 25°C. The cadmium adsorption process was thermodynamically spontaneous and exothermic. The regeneration process showed that these natural clays had excellent recycling capacity. Characterization of the Moroccan natural clays before and after the adsorption process through FTIR, SEM, XRD, and EDX techniques confirmed the Cd (II) ion adsorption on the surfaces of both natural clay adsorbents. Overall, the high adsorption capacity of both natural clays for Cd (II) ions removal compared to other adsorbents motioned in the literature indicated that these two natural adsorbents are excellent candidates for heavy metal removal from aqueous environments.

Removal and Recovery of Cr(VI) from Synthetic and Industrial Wastewater using Bark of Pinus roxburghii as an Adsorbent

2005 ◽  
Vol 40 (4) ◽  
pp. 462-468 ◽  
Author(s):  
Rais Ahmad ◽  
Rifaqat Ali Khan Rao ◽  
Mir Mohammad Masood
Keyword(s):  
Contact Time ◽  
Industrial Wastewater ◽  
Metal Ion ◽  
Freundlich Isotherm ◽  
Batch Process ◽  
Ion Concentration ◽  
Solution Ph ◽  
Pinus Roxburghii ◽  
Column Operation ◽  
Removal And Recovery

Abstract In the present study, the potential of Pinus roxburghii bark as an adsorbent for the removal of heavy metals such as Cr(VI), Ni(II), Cu(II), Cd(II) and Zn(II) from aqueous solution at ambient temperature was investigated. Adsorption capacity of the material was found to be 4.15, 3.89, 3.81, 3.53 and 3.01 mg g-1 for Cr(VI), Zn(II), Cu(II), Ni(II) and Cd(II), respectively, at an initial metal ion concentration of 50 mg L-1 at pH 6.5. The effect of concentration, contact time, adsorbent dose, solution pH, adsorbent particle size, salinity and hardness on the adsorption of Cr(VI) were studied in detail in batch experiments. The equilibrium contact time for Cr(VI) adsorption was found to be 1 h. Adsorption equilibrium data fit well to the Freundlich isotherm in the concentration range studied. The maximum adsorption (96.2%) was recorded at pH 3 for the initial Cr(VI) concentration of 50 mg L-1. The adsorbed metal ions from industrial wastewater were recovered using 0.1 M HCl solution. The column operation was found to be more effective compared to batch process. The percent recovery of Cr(VI) from industrial wastewater by column operation and batch process was found to be 85.8 and 65%, respectively. The results show that Pinus roxburghii bark can be used as a cost-effective adsorbent for the removal and recovery of Cr(VI) from wastewater.

Comprehensive Utilization of Agricultural Bean Husk Powder (CA) Beads – The Research and Application of Using Immobilized Method to Adsorb and Purify Lead of Mine Wastewater

2011 ◽  
Vol 356-360 ◽  
pp. 1475-1481
Author(s):  
Guo Xiang Xu ◽  
Wen Bin Chen
Keyword(s):  
Water Quality ◽  
Metal Ion ◽  
Adsorption Process ◽  
Quality Standard ◽  
Ion Concentration ◽  
Water Quality Standards ◽  
Solution Ph ◽  
Mine Wastewater ◽  
Adsorption Treatment ◽  
First Time

In this study, calcium alginate immobilized bean husk powder(CA) beads was used as an adsorbent for the aim of removing Pb(Ⅱ) ions form the aqueous solutions, and the effect of initial solution pH, contact time, temperature, initial metal ion concentrations and ionic strength in the adsorption process were investigated in detail. Experimental results showed that the amount of adsorbed Pb(Ⅱ) increased with the increasing initial metal ion concentration and solution pH in the examined range. The results showed that the optimum adsorption pH for Pb(Ⅱ) was5.5, the uptake was 10. 78 mg/g, the desorption rates of Pb(Ⅱ) by EDTA was calculated as 90 %. The concentration of Pb(Ⅱ)of mine wastewater reach the first class of irrigation water quality standards after the first time of adsorption treatment, and reach the first class of fishery water quality standard after the second treatment.

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