Adsorption Studies of Nickel(II) Metal Ions Uptake Using Fe3O4 Magnetic Nanoadsorbent

In the present study, Fe3O4 magnetic nanoparticles (MNPs) synthesized in-housed using co-precipitation method was applied for the treatment of aqueous solutions contaminated by Ni(II) ions. Experimental results indicated that at 25ºC, the optimum pH value for Ni(II) removal was pH 6.0 and an adsorbent dose of 60.0 mg. The adsorption capacity of Fe3O4 nanoparticles for Ni(II) is 20.54 mg g−1. Adsorption kinetic rates were found to be fast; total equilibrium was achieved after 180 min. Kinetic experimental data fitted very well the pseudo-second order equation and the value of adsorption rate constants was calculated to be 0.004 and 0.0008 g mg−1 min at 5 and 40 mg L−1 initial Ni(II) concentrations, respectively. The equilibrium isotherms were evaluated in terms of maximum adsorption capacity and adsorption affinity by the application of Langmuir and Freundlich equations. The maximum monolayer capacity obtained from the Langmuir isotherm was 24.57 mg g−1 for Ni(II). Results indicate that the Langmuir model fits adsorption isotherm data better than the Freundlich model.

Download Full-text

Adsorption kinetics and thermodynamics of acid Bordeaux B from aqueous solution by graphene oxide/PAMAMs

Water Science & Technology ◽

10.2166/wst.2015.328 ◽

2015 ◽

Vol 72 (7) ◽

pp. 1217-1225 ◽

Cited By ~ 6

Author(s):

Fan Zhang ◽

Shengfu He ◽

Chen Zhang ◽

Zhiyuan Peng

Keyword(s):

Graphene Oxide ◽

Adsorption Capacity ◽

Ph Value ◽

Maximum Adsorption Capacity ◽

Freundlich Model ◽

Equilibrium Data ◽

Langmuir Isotherm Model ◽

Pseudo Second Order ◽

Effects Of Media ◽

Better Than

Graphene oxide/polyamidoamines dendrimers (GO/PAMAMs) composites were synthesized via modifying GO with 2.0 G PAMAM. The adsorption behavior of the GO/PAMAMs for acid Bordeaux B (ABB) was studied and the effects of media pH, adsorption time and initial ABB concentration on adsorption capacity of the adsorbent were investigated. The optimum pH value of the adsorption of ABB onto GO/PAMAMs was 2.5. The maximum adsorption capacity increased from 325.78 to 520.83 mg/g with the increase in temperature from 298 to 328 K. The equilibrium data followed the Langmuir isotherm model better than the Freundlich model. The kinetic study illustrated that the adsorption of ABB onto GO/PAMAMs fit the pseudo-second-order model. The thermodynamic parameters indicated that the adsorption process was physisorption, and also an endothermic and spontaneous process.

Download Full-text

One-Pot Synthesis of Magnetic Cationic Adsorbent Modified with PDDA for Organic Phosphonates Removal

NANO ◽

10.1142/s179329201950019x ◽

2019 ◽

Vol 14 (02) ◽

pp. 1950019 ◽

Cited By ~ 3

Author(s):

Junjie Chen ◽

Yonggan Ju ◽

Hongling Chen

Keyword(s):

Precipitation Method ◽

Material Structure ◽

Maximum Adsorption Capacity ◽

One Pot ◽

Freundlich Model ◽

Removal Capacity ◽

Magnetic Adsorbents ◽

Pseudo Second Order ◽

Ft Ir ◽

Co Precipitation

Fe3O4 nanoparticles coating with poly dimethyl diallyl ammonium chloride (Fe3O4/PDDA) as novel magnetic adsorbents were synthesized with chemical co-precipitation method to study the removal capacity of organic phosphonates from aqueous solution. The as-prepared magnetic absorbents were characterized for the morphology, material structure and surface properties by SEM, TEM, FT-IR, XRD, TGA and BET. HEDP was employed as a common organic phosphonate to investigate the adsorption performance. Substantial quaternary ammonium groups existing on the surface of Fe3O4/PDDA could enhance the absorption of HEDP with electrostatic attraction. In the optimum condition (4[Formula: see text]mg adsorbent dosage, 11.0 pH, 36[Formula: see text]mg/L HEDP solution and 120[Formula: see text]min adsorption time), the maximum adsorption capacity ([Formula: see text]) for HEDP could reach 254.86[Formula: see text]mg/g. The kinetic study revealed that the adsorption process followed the pseudo-second-order model. The adsorption isotherm fitted closely to the Freundlich model. The as-prepared magnetic adsorbents exhibited notable reusability in some cycles and were easily separated from the solution with the external magnetic field. These as-prepared Fe3O4/PDDA nanoparticles have the potential as an environmental-friendly adsorbent for organic phosphonates removal from waste-water.

Download Full-text

Adsorption Equilibrium of a Herbicide (Pendimethalin) onto Natural Clay

Adsorption Science & Technology ◽

10.1260/026361705774859938 ◽

2005 ◽

Vol 23 (6) ◽

pp. 437-453 ◽

Cited By ~ 7

Author(s):

M.S. El-Geundi ◽

T.E. Farrag ◽

H.M. Abd El-Ghany

Keyword(s):

Particle Size ◽

Adsorption Capacity ◽

Ph Value ◽

Maximum Adsorption Capacity ◽

Natural Clay ◽

Freundlich Model ◽

Adsorption Data ◽

Effect Of Particle Size ◽

System Variables ◽

Better Than

The equilibrium adsorption of a herbicide (pendimethalin) onto natural clay from aqueous solutions was studied experimentally using different system variables. The influence of such variables, such as particle size (dp), pH and temperature, on the adsorption capacity was studied. Equilibrium modelling was carried out using the Langmuir, Freundlich and Redlich—Peterson models with the corresponding constants being calculated for the different system variables. The results indicate that the maximum adsorption capacity (qmax) at an acidic pH value (3.44) was approximately double that observed at an alkaline pH value (9.62). It was also found that the effect of particle size was significant and that the temperature plays an interesting role in the adsorption process. The enthalpy change (ΔH) for adsorption was evaluated as −29.36 kJ/mol. It is clear from the results of this study that the Freundlich model fitted the experimental adsorption data significantly better than the Langmuir or the Redlich—Peterson models.

Download Full-text

Synthesis of magnetic biochar derived from cotton stalks for the removal of Cr(VI) from aqueous solution

Water Science & Technology ◽

10.2166/wst.2019.208 ◽

2019 ◽

Vol 79 (11) ◽

pp. 2106-2115 ◽

Cited By ~ 3

Author(s):

Fengfeng Ma ◽

Baowei Zhao ◽

Jingru Diao

Keyword(s):

Adsorption Capacity ◽

Photoelectron Spectroscopy ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Cotton Stalk ◽

Magnetic Biochar ◽

X Ray ◽

Cotton Stalks ◽

Pseudo Second Order ◽

Co Precipitation

Abstract A magnetic cotton stalk biochar (MCSBC) was synthesized through chemical co-precipitation, based on cotton stalk biochar (CSBC). The MCSBC and CSBC were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and vibrating sample magnetometry. The characterization analyses showed that the magnetization process endowed the CSBC with excellent magnetic properties with a superparamagnetic magnetization of 27.59 emu/g. Batch adsorption experiment results indicated that the Cr(VI) maximum adsorption capacity of MCSBC was 20.05 mg/g, which was higher than that of CSBC (18.77 mg/g). The adsorption kinetic data were well fitted by the pseudo-second-order model and the adsorption isotherms were well represented by the Sips isotherm model. The thermodynamic studies indicated that the adsorption process was spontaneous and endothermic, and the entropy increased. The potential adsorption mechanism was the electrostatic adsorption of anionic Cr(VI) to the positively charged MCSBC surface, the reduction of Cr(VI) into Cr(III) and the complexation of Cr(III) by oxygen-containing functional groups of MCSBC. The regeneration studies showed that MCSBC kept 80% of its initial Cr(VI) adsorption capacity in the cycle. All the findings suggest that this novel magnetic biochar could be used in the field of Cr(VI)-containing wastewater treatment.

Download Full-text

Effective removal of Pb2+ from oral medical wastewater via an activated three-dimensional framework carbon (3D AFC)

Applied Water Science ◽

10.1007/s13201-021-01486-2 ◽

2021 ◽

Vol 11 (9) ◽

Author(s):

Fuxiang Song ◽

Na Wang ◽

Zezhou Hu ◽

Zhen Zhang ◽

Xiaoxue Mai ◽

...

Keyword(s):

Adsorption Capacity ◽

Three Dimensional ◽

High Specific Surface Area ◽

Maximum Adsorption Capacity ◽

Freundlich Model ◽

Dimensional Network ◽

Effective Removal ◽

Strong Adsorption ◽

Pseudo Second Order ◽

Main Material

AbstractOral medical wastewater with heavy metal ions (such as plumbum, Pb2+) is regarded as the main pollutant produced in the oral cavity diagnosis, and the treatment process can pose a serious threat to human health. The removal of Pb2+ from oral medical wastewater facing major difficulties and challenges. Therefore, it is of great significance to take effective measures to remove Pb2+ by using effective methods. A new activated three-dimensional framework carbon (3D AFC), regarded as the main material to remove Pb2+ in the oral medical wastewater, has been fabricated successfully. In this experiment, the effects of 3D AFC absorbing Pb2+ under different conditions (including solid-to-liquid ratio, pH, ionic strength, contact time, and initial concentration, etc.) were discussed. And the result revealed that the adsorption kinetics process of Pb2+ on 3D AFC conformed to the pseudo-second-order model and the adsorption isotherm conformed to the Freundlich model. Under the condition that pH = 5.5 and T = 298 k, the calculated maximum adsorption capacity of 3D AFC for Pb2+ was 270.88 mg/g. In practical application, it has strong adsorption ability for Pb2+ in oral medical wastewater. Thus, 3D AFC shows promise for Pb2+ remove and recovery applications because of high adsorption capacity for Pb2+ in oral medical wastewater due to its high specific surface area, outstanding three-dimensional network structure.

Download Full-text

Adsorption of [AuCl4]– on Ultrasonically and Mechanical-Stirring Assisted Mg/Al-NO3 Hydrotalcite-Magnetite

Indonesian Journal of Chemistry ◽

10.22146/ijc.21141 ◽

2018 ◽

Vol 16 (3) ◽

pp. 268 ◽

Cited By ~ 1

Author(s):

Triastuti Sulistyaningsih ◽

Sri Juari Santosa ◽

Dwi Siswanta ◽

Bambang Rusdiarso

Keyword(s):

Adsorption Capacity ◽

Precipitation Method ◽

Order Kinetic ◽

Weakly Bound ◽

Ph Optimum ◽

Mechanical Stirring ◽

Naoh Solution ◽

Radiation Technique ◽

Pseudo Second Order ◽

Co Precipitation

It has been examined the application of Mg/Al-NO3 hydrotalcite-magnetite synthesized mechanically (MHT) and ultrasonically (UMHT) by co-precipitation method as adsorbents for [AuCl4]– from aqueous solution. Two techniques of synthesis were conducted to determine the effect on the increase of adsorption ability of the [AuCl4]–. Magnetite and Mg/Al-NO3 hydrotalcite-magnetite synthesized by co-precipitation with modifications hydrothermal treatment at 120 °C for 5 h. The adsorbents were characterized by Fourier Transform Infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and Vibrating sample magnetometer (VSM). Adsorption studies were done by getting the optimum pH, optimum contact time and the optimum concentration. A result of the adsorption study of [AuCl4]– on both adsorbents was optimum at pH 3 and fitted well to Langmuir isotherm and pseudo second-order kinetic models. The adsorption capacity of UMHT (ultrasonic technique) was 66.67 mg g-1 and it was higher than that of MHT (mechanic technique), i.e. 31.25 mg g-1. This shows that the ultrasonic radiation technique can increase the adsorption capacity of the [AuCl4]–. Based on the desorption using 0.5 mol L-1 NaOH solution, more [AuCl4]– was eluted from MHT, indicating that [AuCl4]– was weakly bound on MHT than UMHT.

Download Full-text

Comparative study on the synthesis of magnetic ferrite adsorbent for the removal of Cd(II) from wastewater

Adsorption Science & Technology ◽

10.1177/0263617418779729 ◽

2018 ◽

Vol 36 (7-8) ◽

pp. 1456-1469 ◽

Cited By ~ 6

Author(s):

Fang Liu ◽

Kanggen Zhou ◽

Quanzhou Chen ◽

Aihe Wang ◽

Wei Chen

Keyword(s):

Aqueous Solution ◽

Wastewater Treatment ◽

Adsorption Capacity ◽

Settling Velocity ◽

Ph Value ◽

Cost Effective ◽

Precipitation Method ◽

Maximum Adsorption Capacity ◽

Effects Of Ph ◽

Magnetic Ferrites

The magnetic ferrites were synthesized at ambient temperature through the precipitation method in aqueous solution at varying pH values and were used as novel adsorbents for heavy metal-containing wastewater treatment. The magnetic ferrites were applied for the removal of Cd(II) ion from wastewater. The synthesized magnetic ferrites were characterized by settling velocity, X-ray diffraction, scanning electron microscopy, laser particles size analyzer, and vibrating sample magnetometer. The effects of pH value and contact time on the adsorption process were investigated. The magnetic ferrites had a saturation magnetization value of 82.30 emu/g and a settling velocity of 2%, indicating easy separation from aqueous solution under magnetic field. The adsorption of Cd(II) onto the magnetic ferrites followed the pseudo-second-order kinetics and the Langmuir isotherm model. The most suitable pH condition for the synthesis of magnetic ferrite with optimal Cd(II) adsorption capacity was 9.0, and a maximum adsorption capacity of 160.91 mg/g for Cd(II) ions can be achieved. Based on the cost analysis, the magnetic ferrite was a cost-effective adsorbent for Cd-containing wastewater treatment.

Download Full-text

Adsorption of Dye from Wastewater by Modified Sawdust

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1065-1069.3123 ◽

2014 ◽

Vol 1065-1069 ◽

pp. 3123-3126

Author(s):

Gang Chao Zhu ◽

Jian Xin Shou ◽

Jia Wei Qian ◽

Hua Zheng Xin ◽

Mu Qing Qiu

Keyword(s):

Adsorption Capacity ◽

Contact Time ◽

Ph Value ◽

Langmuir Model ◽

Ammonium Bromide ◽

Maximum Adsorption Capacity ◽

Order Model ◽

Adsorption Processes ◽

Endothermic Process ◽

Pseudo Second Order

In this study, sawdust modified by cetyltimethyl ammonium bromide was applied to adsorb conge red in aqueous solutions. The characteristics of modified sawdust were characterized by Fourier transform infrared spectrum and scanning electron microscopy. The effect of factors, such as pH, contact time, temperature, dosage, and salt concentration, were investigated. The results revealed that the addition of modified sawdust can significantly increase the adsorption capacity of dye. The maximum adsorption capacity of dye on modified sawdust was 109 mg·g-1 at 328K. The adsorption processes were rapid within the first 30 min and reached equilibrium in about 150 min. The adsorption kinetics fitted well with pseudo-second-order model. The pH value of the solution had significant impact on the amount of adsorption. Adsorption isotherm fitted better with the Langmuir model and the adsorption was an endothermic process

Download Full-text

Facile Co-precipitation Synthesis of Nanosized MnFe2O4 for Effective Removal of Zn(II) Ions From Aqueous Media

10.21203/rs.3.rs-174931/v1 ◽

2021 ◽

Author(s):

Ahmed Alharbi ◽

Ahmad A. Alluhaybi ◽

Salwa AlReshaidan ◽

Hany M. Youssef

Keyword(s):

Aqueous Media ◽

Precipitation Method ◽

Maximum Adsorption Capacity ◽

Sem Image ◽

Effective Removal ◽

Initial Ph ◽

Pseudo Second Order ◽

Ft Ir ◽

Co Precipitation ◽

Average Size

Abstract In this work, the spinel nanosized MnFe2O4 (18.14 nm) was facilely synthesized through the co-precipitation method to study the removal of Zn(II) ions from aqueous media. The fabricated MnFe2O4 sample was characterized using VSM, XRD, HR-TEM, EDS, FE-SEM, and FT-IR analyses. The principal XRD peaks, which are ascribed to (4 4 0), (3 3 3), (4 2 2), (4 0 0), (2 2 2), (3 1 1), (2 2 0), and (1 1 1) crystal planes, prove the cubic assembly of nanosized manganese ferrite as shown from JCPDS No. 74-2403. The EDS pattern confirmed that the % Wt of Mn, Fe, and O is 24.12, 48.04, and 28.15, respectively. The FE-SEM image confirmed the cubic nature of the surface of MnFe2O4 nanoparticles which have an average size of 110 nm. The saturation magnetization was 65 emu/g. The impacts of initial pH, concentration of Zn(II) ions, contact time, and temperature on the uptake of Zn(II) ions were accurately investigated. The removal of Zn(II) ions is spontaneous, exothermic, and followed the pseudo-second-order model and the Langmuir isotherm. The maximum adsorption capacity equals 330.03 mg/g.

Download Full-text

Removal of hexavalent chromium from aqueous solution by calcined Zn/Al-LDHs

Water Science & Technology ◽

10.2166/wst.2016.204 ◽

2016 ◽

Vol 74 (1) ◽

pp. 229-235 ◽

Cited By ~ 4

Author(s):

Hui-Duo Yang ◽

Yun-Peng Zhao ◽

Shi-Feng Li ◽

Xing Fan ◽

Xian-Yong Wei ◽

...

Keyword(s):

Hexavalent Chromium ◽

Precipitation Method ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

X Ray Diffraction ◽

Effects Of Ph ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Co Precipitation ◽

Double Hydroxides

In this study, Zn/Al-layered double hydroxides (Zn/Al-LDHs) were synthesized by a co-precipitation method and characterized with X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. Then the hexavalent chromium Cr(VI) adsorption experiments on calcined Zn/Al-LDHs were carried out to analyze the effects of pH, temperature, adsorption time, initial Cr(VI) concentration and adsorbent dosage on the removal of Cr(VI) from aqueous solutions. The maximum adsorption capacity for Cr(VI) on calcined Zn/Al-LDHs under optimal conditions was found to be over 120 mg/g. The kinetic and isotherm of Cr(VI) adsorption on calcined Zn/Al-LDHs can be described with the pseudo-second-order kinetic model and Langmuir isotherm, respectively.

Download Full-text