scholarly journals Alkali-Activated Adsorbents from Slags: Column Adsorption and Regeneration Study for Nickel(II) Removal

2021 ◽  
Vol 5 (1) ◽  
pp. 13 ◽  
Author(s):  
Elavarasi Sundhararasu ◽  
Sari Tuomikoski ◽  
Hanna Runtti ◽  
Tao Hu ◽  
Toni Varila ◽  
...  
Keyword(s):  
Converter Slag ◽  
Fixed Bed ◽  
Column Studies ◽  
Time Intervals ◽  
Fixed Bed Column ◽  
X Ray ◽  
Column Adsorption ◽  
Adsorption Desorption ◽  
Regeneration Study ◽  
Alkali Activated

Alkali-activated adsorbents were synthesized by mixing three different slags from the steel industry: blast furnace slag (BFS), ladle slag (LS), and Lintz–Donawitz converter slag (LD). These powdered slag-based geopolymers (GP) were used to remove nickel(II) from aqueous solutions in fixed-bed column studies. The experiments were conducted in pH 6 using a phosphate buffer with initial nickel(II) concentration of 50 mg/L. Samples were taken at time intervals of between 5 and 90 min. Three adsorption–desorption cycles were implemented with a flow rate of 5 mL/min. The geopolymers were characterized by Fourier-Transform Infrared Spectroscopy (FTIR), X-ray powder diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), X-ray fluorescence (XRF), specific surface area measurements, and a leaching test. The data were found to describe the Thomas, Adams–Bohart, and Yoon–Nelson models well. For GP (BFS, LS), experimental adsorption capacity was 2.92 mg/g, and for GP (LD, BFS, LS), it was 1.34 mg/g. The results indicated that the produced adsorbents have the potential to be used as adsorbents for the removal of nickel(II).

Continuous fixed bed adsorption of Cu(II) by halloysite nanotube–alginate hybrid beads: an experimental and modelling study

2014 ◽  
Vol 70 (2) ◽  
pp. 192-199 ◽  
Author(s):  
Yanyan Wang ◽  
Xiang Zhang ◽  
Qiuru Wang ◽  
Bing Zhang ◽  
Jindun Liu
Keyword(s):  
Adsorption Capacity ◽  
Flow Rate ◽  
Fixed Bed ◽  
Halloysite Nanotubes ◽  
Fixed Bed Column ◽  
Factors Affecting ◽  
Bed Height ◽  
Column Adsorption ◽  
Fixed Bed Adsorption ◽  
Adsorption Desorption

We used natural resources of halloysite nanotubes and alginate to prepare a novel porous adsorption material of organic–inorganic hybrid beads. The adsorption behaviour of Cu(II) onto the hybrid beads was examined by a continuous fixed bed column adsorption experiment. Meanwhile, the factors affecting the adsorption capacity such as bed height, influent concentration and flow rate were investigated. The adsorption capacity (Q0) reached 74.13 mg/g when the initial inlet concentration was 100 mg/L with a bed height of 12 cm and flow rate of 3 ml/min. The Thomas model and bed-depth service time fitted well with the experimental data. In the regeneration experiment, the hybrid beads retained high adsorption capacity after three adsorption–desorption cycles. Over the whole study, the new hybrid beads showed excellent adsorption and regeneration properties as well as favourable stability.

scholarly journals Batch and Fixed-Bed Column Studies on Palladium Recovery from Acidic Solution by Modified MgSiO3

2020 ◽  
Vol 17 (24) ◽  
pp. 9500
Author(s):  
Cosmin Vancea ◽  
Maria Mihailescu ◽  
Adina Negrea ◽  
Giannin Mosoarca ◽  
Mihaela Ciopec ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Fixed Bed ◽  
Recovery Process ◽  
Dynamic Regime ◽  
Bet Surface Area ◽  
High Price ◽  
Maximum Adsorption Capacity ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Column Adsorption

Effective recovery of palladium ions from acidic waste solutions is important due to palladium’s intensive usage as a catalyst for different industrial processes and to the high price paid for its production from natural resources. In this paper, we test the ability of a new adsorbent, MgSiO3 functionalized by impregnation with DL-cysteine (cys), for palladium ion recovery from waste solutions. The Brunauer–Emmett–Teller (BET) surface area analysis, Barrett–Joyner–Halenda (BJH) pore size and volume analysis, scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy and Fourier-Transformed Infrared (FTIR) spectroscopy have been performed to characterize this material. Firstly, the maximum adsorption capacity of the new obtained material, MgSiO3-cys, in batch, was studied. To establish the adsorption mechanism, the obtained experimental data were fitted using the Langmuir, Freundlich and Sips adsorption isotherms. Studies on the adsorption of palladium ions on the synthesized material were performed in a dynamic regime, in a fixed-bed column. The Pd(II) recovery mechanism in the dynamic column regime was established based on Bohart–Adams, Yoon–Nelson, Thomas, and Clark models. The obtained equilibrium adsorption capacity was 9.3 (mg g−1) in static regime (batch) and 3 (mg g−1) in dynamic regime (column). The models that best describe the Pd(II) recovery process for batch and column adsorption are Sips and Clark, respectively.

scholarly journals Adsorptive Properties of Poly(1-methylpyrrol-2-ylsquaraine) Particles for the Removal of Endocrine-Disrupting Chemicals from Aqueous Solutions: Batch and Fixed-Bed Column Studies

Processes ◽  
2018 ◽  
Vol 6 (9) ◽  
pp. 155 ◽  
Author(s):  
Augustine Ifelebuegu ◽  
Habibath Salauh ◽  
Yihuai Zhang ◽  
Daniel Lynch
Keyword(s):  
Endocrine Disrupting Chemicals ◽  
Fixed Bed ◽  
Squaric Acid ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Complex Process ◽  
Column Adsorption ◽  
Endocrine Disrupting ◽  
Rate Limiting ◽  
Adsorptive Properties

The adsorptive properties of poly(1-methylpyrrol-2-ylsquaraine) (PMPS) particles were investigated in batch and column adsorption experiments as alternative adsorbent for the treatment of endocrine-disrupting chemicals in water. The PMPS particles were synthesised by condensing 3,4-dihydroxycyclobut-3-ene-1,2-dione (squaric acid) with 1-methylpyrrole in butanol. The results demonstrated that PMPS particles are effective in the removal of endocrine disrupting chemicals (EDCs) in water with adsorption being more favourable at an acidic pH, and a superior sorption capacity being achieved at pH 4. The results also showed that the removal of EDCs by the PMPS particles was a complex process involving multiple rate-limiting steps and physicochemical interactions between the EDCs and the particles. Gibbs free energy of −8.32 kJ/mole and −6.6 kJ/mol, and enthalpies of 68 kJ/mol and 43 kJ/mol, were achieved for the adsorption E2 and EE2 respectively The removal efficiencies of the EDCs by PMPS particles were comparable to those of activated carbon, and hence can be applied as an alternative adsorbent in water treatment applications.

scholarly journals FIXED-BED COLUMN ADSORPTION OF ARSENIC(V) BY POROUS COMPOSITE OF MAGNETITE/HEMATITE/CARBON WITH EUCALYPTUS WOOD MICROSTRUCTURE

2018 ◽  
Vol 26 (1) ◽  
pp. 38-56 ◽  
Author(s):  
Yanhong LI ◽  
Yinian ZHU ◽  
Zongqiang ZHU ◽  
Xuehong ZHANG ◽  
Dunqiu WANG ◽  
...  
Keyword(s):  
Grain Size ◽  
Iron Oxides ◽  
Operating Temperature ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Porous Composite ◽  
Fixed Bed Column ◽  
Eucalyptus Wood ◽  
Column Adsorption ◽  
Adsorption Desorption

The fixed-bed column adsorption-desorption of As(V) by the porous composite of iron oxides and carbon with eucalyptus wood hierarchical microstructure (PC-Fe/C) was experimentally studied. The increase in the influent As(V) concentration and the inflow rate resulted in an earlier exhaustion of the column. The breakthrough curves indicated that a larger adsorbent mass, a smaller adsorbent grain size and a lower influent pH prolonged the column life span. The operating temperature had negligible effect. All breakthrough curves could be well fitted with the Thomas and Yoon–Nelson models. Under the condition of the influent flow rate of 5.136 mL/min, the influent As(V) concentration of 20 mg/L, the influent pH of 3, the adsorbent mass of 2 g, the adsorbent grain size of <100 mesh, and the operating temperature of 35 °C, the equilibrium adsorption capacity reached 10.49 mg/g, which was greater than those of natural/synthetic iron oxides adsorbents and iron-oxide-coated adsorbents.

Continuous fixed-bed column studies of arsenite removal via oxidation and adsorption coprocesses

2021 ◽  
Vol 42 ◽  
pp. 102176
Author(s):  
Pummarin Khamdahsag ◽  
Dickson Y.S. Yan ◽  
Pongnapa Poompang ◽  
Nichapa Supannafai ◽  
Visanu Tanboonchuy
Keyword(s):  
Fixed Bed ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Arsenite Removal
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