Adsorption Characteristic of Steel Slag Haydite for Phosphorus Removal from Wastewater

2013 ◽  
Vol 690-693 ◽  
pp. 1033-1036 ◽  
Author(s):  
Xiao Liu ◽  
Mei Yang ◽  
Yong Yang
Keyword(s):  
Steel Slag ◽  
Phosphate Adsorption ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Adsorption Characteristic ◽  
Adsorption Data ◽  
Isotherm Adsorption ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Increasing Temperature

Slag haydite made from steel slag and clay was used for phosphate adsorption, and adsorption characteristic was studied. Results showed that the uptake of phosphate was facilitated for pH 3-8, the adsorption process fitted with pseudo-second-order model and intra-particle diffusion model, and the equilibrium time was about 3h. Isotherm adsorption data on slag haydite were fitted by both the Freundlich and Langmuir models. It was found that the data follows the Langmuir model better, and the maximum adsorption capacity increased from 1.17mg·g-1 to 2.42mg·g-1 as temperature rose from 20°C to 40°C. Thermodynamic parameters G0, H0 andS0 showed that the adsorption was spontaneous, endothermic and entropy increase process and increasing temperature was favorable.

Kinetic and Thermodynamic Studies of Adsorption of Phosphate on Steel-Slag Filter Material

2014 ◽  
Vol 507 ◽  
pp. 707-710
Author(s):  
Xue Lian Li ◽  
Xiao Liu ◽  
Guo Ping Cao
Keyword(s):  
Steel Slag ◽  
Filter Material ◽  
Phosphate Adsorption ◽  
Maximum Adsorption Capacity ◽  
Adsorption Characteristic ◽  
Adsorption Data ◽  
Isotherm Adsorption ◽  
Pseudo Second Order ◽  
C 30 ◽  
Kinetic And Thermodynamic Studies

Slag filter material made from steel slag and clay was used for phosphate adsorption, and adsorption characteristic was studied by batch experiments. Results showed that the uptake of phosphate on slag filter material at different temperature fitted with pseudo-second-order model, and the activation energy was more than 40kJ/mol. In addition, isotherm adsorption data on slag filter material followed the Langmuir model well, and the maximum adsorption capacity at 20°C, 30°C and 40°C were 1.166, 1.826 and 2.422mg/g, respectively. Thermodynamic parameters G0, H0andS0showed that the adsorption was spontaneous, endothermic and entropy increase process and chemical adsorption was dominant for phosphate uptake.

scholarly journals Equilibrium, Kinetic and Thermodynamic Studies of Biosorption of Methylene Blue on Goethite Modified Baobab Fruit Pod (Adansonia Digitata L.)

2020 ◽  
Vol 24 (7) ◽  
pp. 1229-1243
Author(s):  
A.H. Alabi ◽  
E.O. Oladele ◽  
A.J.O. Adeleke ◽  
F.C. Oni ◽  
C.A. Olanrewaju
Keyword(s):  
Methylene Blue ◽  
Kinetic Data ◽  
Second Order ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adansonia Digitata ◽  
Adsorption Data ◽  
Freundlich Adsorption Isotherm ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order

Methylene Blue (MB) was adsorbed from aqueous solution using Baobab (Adansonia digitata L.) fruit pod and its goethite modified form. Adsorbents were characterized using Fourier Transform-Infra Red (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). Batch experiments were conducted at room temperature (26.8 °C) and the adsorption data were fitted using Langmuir, Freundlich, Temkin and Dubinin- Radushkevich isotherms. Also, kinetic data was fitted using Pseudo-first order, pseudo-second order, Elovich and intra-particle diffusion models. Goethite modified baobab (GMB) appeared to have a coarse microporous surface with smoother surface and larger pore volumes compared to unmodified baobab (UB). The –C=O band was observed at 1631 and 1636 cm-1 for UB and GMB. The –OH band was observed at 3447.00 cm-1 and 3442 cm-1 for UB andGMB respectively. Langmuir model was suitable for describing the adsorption data of UB with R2 of 0.9293 while Temkin model was best for fitting adsorption data of MB on GMB with R2 of 0.9691. However, maximum adsorption capacity was obtained with Freundlich adsorption isotherm (15.4253 and 43.1301 mg/g for UB and GMB respectively). The maximum biosorption were 8.98 mg/g and 9.86 mg/g for UB and GMB respectively at pH 10. Pseudo-second-order kinetic model best fitted the kinetic data with R2 values of 0.9968 and 0.9993 for UB and GMB, ΔHo values were 83.123 KJ/mol and 361.094 KJ/mol for UB and GMB, while ΔSo values were 3.084 J/mol/ K and 1.765 J/mol/K for UB and GMB respectively. GMB adsorbed more of MB than UB and the process was endothermic. Keywords: Biosorption, Goethite, Baobab, Isotherms, Methylene blue.

scholarly journals Kinetic and Thermodynamic Studies on the Phosphate Adsorption Removal by Dolomite Mineral

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaoli Yuan ◽  
Wentang Xia ◽  
Juan An ◽  
Jianguo Yin ◽  
Xuejiao Zhou ◽  
...  
Keyword(s):  
Adsorption Kinetics ◽  
Removal Rate ◽  
Second Order ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Thermodynamic Studies ◽  
Pseudo Second Order ◽  
Second Order Model

The efficiency of dolomite to remove phosphate from aqueous solutions was investigated. The experimental results showed that the removal of phosphate by dolomite was rapid (the removal rate over 95% in 60 min) when the initial phosphate concentration is at the range of 10–50 mg/L. Several kinetic models including intraparticle diffusion model, pseudo-first-order model, Elovich model, and pseudo-second-order model were employed to evaluate the kinetics data of phosphate adsorption onto dolomite and pseudo-second-order model was recommended to describe the adsorption kinetics characteristics. Further analysis of the adsorption kinetics indicated that the phosphate removal process was mainly controlled by chemical bonding or chemisorption. Moreover, both Freundlich and Langmuir adsorption isotherms were used to evaluate the experimental data. The results indicated that Langmuir isotherm was more suitable to describe the adsorption characteristics of dolomite. Maximum adsorption capacity of phosphate by dolomite was found to be 4.76 mg phosphorous/g dolomite. Thermodynamic studies showed that phosphate adsorption was exothermic. The study implies that dolomite is an excellent low cost material for phosphate removal in wastewater treatment process.

Zinc Chloride-activated Waste Carbon Powder for Decolourization of Methylene Blue

2014 ◽  
Vol 67 (2) ◽  
Author(s):  
Muhammad Abbas Ahmad Zaini ◽  
Ting Chiew Ngiik ◽  
Mohd. Johari Kamaruddin ◽  
Siti Hamidah Mohd. Setapar ◽  
Mohd. Azizi Che Yunus
Keyword(s):  
Methylene Blue ◽  
Surface Area ◽  
Activated Carbons ◽  
Carbon Powder ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Mixed Features ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Langmuir And Freundlich Models

Waste carbon powder from pyrolysis of discarded tyre was converted into activated carbon for decolourization of metylene blue (MB). The precursor was activated using ZnCl2 (ZC), recycled ZnCl2 solution from the earlier activation (RC), and irradiated water (MC). Activated carbons were characterized according to surface area and morphology. The values of surface area were recorded as 288, 104 and 113 m2/g for ZC, RC and MC, respectively. The decolourization of MB was observed to have the following order: ZC>MC>RC. The maximum adsorption capacity of MB by ZC was found to be 154 mg/g. Adsorption data for all activated carbons studied obeyed Redlich-Peterson isotherm for which the process could be described as mixed features of Langmuir and Freundlich models. The kinetics data were well-fitted to pseudo-second-order model, suggesting the chemisorption process.

Biosorption of Nickel Ions by Modified Chitosan from Aqueous Solutions

2014 ◽  
Vol 472 ◽  
pp. 835-839 ◽  
Author(s):  
Wei Ma ◽  
Lian Lian Gao ◽  
Zi Hong Cheng ◽  
Ren Wang ◽  
Fu Jun Liu ◽  
...  
Keyword(s):  
Crosslinking Agent ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Chitosan Beads ◽  
Nickel Ions ◽  
Modified Chitosan ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Model Equations ◽  
Main Model

Since commercial chitosan powder may dissolve in water to some degree and demands to be modified chemically to create its own exclusive pore canal we have synthetized two different modified chitosan beads in this investigation by using glutaraldehyde as crosslinking agent, significantly, novel porogen silica sol and methanol, and analysis means SEM, FTIR and BET demonstrated that the surface area and pore size improved signally. Moreover, the adsorption conditions pH and ionic strength have been considered, and the maximum adsorption capacity of nickel ions was 32.40 mg/g at the optimum condition. Furthermore, the main model equations on isotherm and kinetics have been deliberated and the results clearly revealed that Freundlich, external mass transfer, intra particle diffusion and pseudo second order model fitted better to the experimental data (R2> 0.99, all). It is expected that this results would be serviceable to remove metals from wastewater using chitosan and its derivatives.

scholarly journals Application of Scallop shell-Fe3O4 nanoparticles for the removal of Cr(VI) from aqueous solutions

2017 ◽  
Vol 75 (10) ◽  
pp. 2369-2380 ◽  
Author(s):  
Azita Mohagheghian ◽  
Robabeh Vahidi-Kolur ◽  
Melina Pourmohseni ◽  
Jae-Kyu Yang ◽  
Mehdi Shirzad-Siboni
Keyword(s):  
Removal Efficiency ◽  
Fe3o4 Nanoparticles ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
Scallop Shell ◽  
Order Model ◽  
Adsorbent Dosage ◽  
X Ray ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order

In this study, removal of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was investigated with variation of pH, adsorbent dosage, initial Cr(VI) concentration, ionic strength and temperature. Coating of Fe3O4 nanoparticles onto Scallop shell was identified by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The maximum adsorption was observed at pH 3. Removal efficiency of Cr(VI) was increased with increasing adsorbent dosage, but was decreased with increasing initial Cr(VI) concentration and temperature. Removal efficiency of Cr(VI) was decreased in the presence of sulfate and carbonate ions. Adsorption kinetic study revealed that a pseudo-second order model better described the removal data than a pseudo-first order model and an intra-particle diffusion model. Maximum adsorption capacity was estimated to be 34.48 mg/g. Thermodynamic studies indicated that adsorption of Cr(VI) onto Scallop shell-Fe3O4 nanoparticles occurred via an exothermic (ΔH = −320.88 KJ mol−1) process. Adsorption efficiency of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was maintained even after eight successive cycles.

scholarly journals Karekterisasi, Kinetika, dan Isoterm Adsorpsi Limbah Ampas Kelapa sebagai Adsorben Ion Cu(II)

SAINTIFIK ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. 104-115
Author(s):  
Agusriyadin Agusriyadin
Keyword(s):  
Adsorption Capacity ◽  
Ph Effect ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Optimum Conditions ◽  
Langmuir Adsorption ◽  
Adsorbent Surface ◽  
Adsorption Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Penelitian ini bertujuan untuk menguji kemampuan AK dan AKPM dalam mengadsorpsi ion Cu (II), pengaruh parameter adsorpsi dan mekanisme adsorpsi. AK dan AKP Madsorben dibuat dari residu ampas kelapa. Adsorben dikarakterisasi dengan FTIR, SEM dan EDS. Pengaruh parameter adsorpsi seperti pH awal, dosis adsorben, waktu kontak dan konsentrasi ion Cu (II) awal diperiksa untuk menentukan kondisi optimum serapan tembaga (II). Ion Cu (II) yang teradsorpsi diukur berdasarkan pada konsentrasi Ion Cu (II) sebelum dan sesudah adsorpsi menggunakan metode AAS. Hasil karakterisasi menunjukkan bahwa struktur pori dan gugus fungsi tersedia pada permukaan adsorben. Menurut percobaan efek pH, kapasitas adsorpsi maksimum dicapai pada pH 7. Waktu kontak optimal dan konsentrasi tembaga awal (II) ditemukan masing-masing pada 120 menit dan 100 mg L-1. Data eksperimental sesuai dengan model kinetik orde dua orde dua, dan Langmuir isoterm adsorpsi yang diperoleh paling sesuai dengan data adsorpsi. Kapasitas adsorpsi maksimum adsorben ditemukan menjadi 4,73 dan 6,46 mg g-1 pada kondisi optimal. The results of characterization showed that the pore structure and the functional groups were available on adsorbent surface. According to the pH effect experiments, the maximum adsorption capacity was achieved at pH 7. Optimum contact time and initial copper(II) concentration were found at 120 min and 100 mg L-1, respectively. The experimental data were comply with the pseudo-second-order kinetic model, and Langmuir adsorption isotherm obtained best fitted the adsorption data. The maximum adsorption capacity of the adsorbents was found to be 4.73 and 6.46 mg g-1 at optimum conditions.

Removal of hexavalent chromium from aqueous solution using exfoliated polyaniline/montmorillonite composite

2014 ◽  
Vol 70 (4) ◽  
pp. 678-684 ◽  
Author(s):  
Jun Chen ◽  
Xiaoqin Hong ◽  
Yongteng Zhao ◽  
Qianfeng Zhang
Keyword(s):  
Adsorption Capacity ◽  
Chemical Oxidation ◽  
Maximum Adsorption Capacity ◽  
Isothermal Model ◽  
Adsorption Characteristic ◽  
In Situ Chemical Oxidation ◽  
Acid Copolymer ◽  
Chemical Oxidation Polymerization ◽  
Effects Of Ph ◽  
Pseudo Second Order

Exfoliated polyaniline/montmorillonite (PANI/MMT) composites with nanosheet structure were successfully prepared by in situ chemical oxidation polymerization with MMT platelets as the scaffold. Amphoteric polymer, (2-methacryloyloxyethyl)trimethyl ammonium chloride and methacrylate acid copolymer, was used to modify montmorillonite and a large number of carboxylic acids were introduced on the surface of the clay platelets, which can be used as a dopant of PANI and play a ‘bridge’ role to combine PANI with clay. Adsorption experiments were carried out to study the effects of pH, contact time, Cr(VI) concentration, adsorbent dose and temperature. The adsorption of Cr(VI) on the PANI/MMT was highly pH dependent and the adsorption kinetics followed a pseudo-second-order model. The Langmuir isothermal model described the adsorption isotherm data well and the maximum adsorption capacity increased with the increase in temperature. Thermodynamic investigation indicated that the adsorption process is spontaneous, endothermic and marked with an increase in randomness at the adsorbent – liquid interface. The maximum adsorption capacity of the PANI/MMT composites for Cr(VI) was 308.6 mg/g at 25 °C. The excellent adsorption characteristic of exfoliated PANI/MMT composites will render it a highly efficient and economically viable adsorbent for Cr(VI) removal.

scholarly journals Equilibrium and Kinetic Study of Lead and Copper Ion Adsorption on Chitosan-Grafted-Polyacrylic Acid Synthesized by Surface Initiated Atomic Transfer Polymerization

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2218 ◽  
Author(s):  
Carlos Grande-Tovar ◽  
William Vallejo ◽  
Fabio Zuluaga
Keyword(s):  
Adsorption Capacity ◽  
Polyacrylic Acid ◽  
Adsorption Process ◽  
Kinetic Constant ◽  
Copper Ion ◽  
Toxic Metal ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Equilibrium Studies ◽  
Pseudo Second Order

In this work, we synthesized chitosan grafted-polyacrylic acid (CS-g-PA) through surface-initiated atom transfer radical polymerization (SI-ATRP). We also studied the adsorption process of copper and lead ions onto the CS-g-PA surface. Adsorption equilibrium studies indicated that pH 4.0 was the best pH for the adsorption process and the maximum adsorption capacity over CS-g-PA for Pb2+ ions was 98 mg·g−1 and for Cu2+ it was 164 mg·g−1, while for chitosan alone (CS), the Pb2+ adsorption capacity was only 14.8 mg·g−1 and for Cu2+ it was 140 mg·g−1. Furthermore, the adsorption studies indicated that Langmuir model describes all the experimental data and besides, pseudo-second-order model was suitable to describe kinetic results for the adsorption process, demonstrating a larger kinetic constant of the process was larger for Pb2+ than Cu2+. Compared to other adsorbents reported, CS-g-PA had comparable or even superior adsorbent capacity and besides, all these results suggest that the new CS-g-PA polymers had potential as an adsorbent for hazardous and toxic metal ions produced by different industries.

Preparation of bio-based magnetic adsorbent and application for efficient removal of Cd(II) from water

2018 ◽  
Vol 77 (5) ◽  
pp. 1313-1323 ◽  
Author(s):  
Jianjun Zhou ◽  
Xionghui Ji ◽  
Xiaohui Zhou ◽  
Jialin Ren ◽  
Yaochi Liu
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Low Cost ◽  
Maximum Adsorption Capacity ◽  
Magnetic Adsorbent ◽  
Order Model ◽  
Efficient Removal ◽  
Adsorption Ability ◽  
Adsorption Sites ◽  
Pseudo Second Order

Abstract A novel magnetic bio-adsorbent (MCIA) was developed, characterized and tested for its Cd(II) removal from aqueous solution. MCIA could be easily separated from the solution after equilibrium adsorption due to its super-paramagnetic property. The functional and magnetic bio-material was an attractive adsorbent for the removal of Cd(II) from aqueous solution owing to the abundant adsorption sites, amino-group and oxygen-containing groups on the surface of Cyclosorus interruptus. The experimental results indicated that the MCIA exhibited excellent adsorption ability and the adsorption process was spontaneous and endothermic. The adsorption isotherm was consistent with the Langmuir model. The adsorption kinetic fitted the pseudo-second-order model very well. The maximum adsorption capacity of Cd(II) onto MCIA was 40.8, 49.4, 54.6 and 56.6 mg/g at 293, 303, 313 and 323 K, respectively. And the MCIA exhibited an excellent reusability and impressive regeneration. Therefore, MCIA could serve as a sustainable, efficient and low-cost magnetic adsorbent for Cd(II) removal from aqueous solution.

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