scholarly journals Removal of chromium and Iron using mixed adsorbent for synthetic and industrial samples in a continuous column reactor

YMER Digital ◽  
2022 ◽  
Vol 21 (01) ◽  
pp. 98-111
Author(s):  
Dr. Srinivas Tadepalli ◽  
◽  
Dr. K.S.R Murthy ◽  
Dr. P Suresh Kumar ◽  
Dr. Prasanthi Kumari Nunna ◽  
...  
Keyword(s):  
Metal Ion ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Fixed Bed ◽  
Industrial Effluent ◽  
Ion Concentration ◽  
Flow Rates ◽  
Saturation Time ◽  
Bed Height ◽  
Synthetic Solution

he results of the experiments showed that bed weight, flow rate, and initial metal ion concentration all play a role in the removal of Cr (III) and Fe (II). The optimized break through curve was obtained at 36cm bed height and 10ml/min for chromium where 97.5 to 100% removal was observed at a saturation time of 500-600 min. With the increase in bed height from 12cm to 36cm, both the breakthrough and saturation times for Cr (III) increased. The break through time at 12cm, 24cm, 36cm and 10ml/min for Cr (III) were 70 min, 105 min, and 35 min respectively. The saturation time for Cr (III) at 12cm, 24cm, 36cm and 10ml/min were 460 min, 490 min, and 500 min respectively. Similarly, the break through time for Fe (II) at 12cm, 24cm, 36cm and 10ml/min were 70 min, 80 min, and 100 min respectively. At 12cm, 24cm, 36cm, and 10ml/min, the saturation time for Fe (III) was 340 minutes, 360 minutes, and 430 minutes, respectively. Overall in the column performance comparison between synthetic solution and industrial effluents for chromium, synthetic solution performance was more superior at fixed volumetric flow rates of 10 ml/min and bed heights ranging from 12 cm to 36 cm But the reverse trend was observed in case of fixed bed heights of 36 cm (150 g) and variation of volumetric flow rates from 10ml/min to 30ml/min which indicates that industrial effluent performance was superior when compared to synthetic solution for heavy metal removal.

scholarly journals Factory Tea Waste Biosorbent for Cu(II) and Zn(II) Removal from Wastewater

2021 ◽  
Vol 287 ◽  
pp. 04006
Author(s):  
Patrick Tan Peng Jun ◽  
Wan Nur Aisyah Wan Osman ◽  
Shafirah Samsuri ◽  
Juniza Md Saad ◽  
Muhamad Fadli Samsudin ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Removal Efficiency ◽  
Metal Ion ◽  
Metal Removal ◽  
Ph Value ◽  
Heavy Metal Removal ◽  
Fixed Bed ◽  
Ion Concentration ◽  
Fixed Bed Adsorption ◽  
Tea Waste

Recent studies have shown great interest toward heavy metal removal due to its hazardous and non-biodegradable properties. Many approaches have been used for this purpose and one of them is adsorption. In this study, several experiments were carried out to investigate the feasibility of factory tea waste as a biosorbent in a fixed-bed adsorption column for heavy metal removal (zinc and copper) in wastewater. The results highlighted that zinc has better performance compared to copper in terms of the effect of initial ion concentration, pH value, and the mixed ions with respect to the removal efficiency. Zinc showed higher removal efficiency and adsorption capacity at the initial metal ion concentration of 200 mg/L, which are 99.21% and 39.68 mg/mg compared to copper. Meanwhile, for the effect of pH values and mixed ion concentration, zinc also showed slightly higher removal efficiency which are 99.91% and 98.47%, respectively compared to copper. However, both zinc and copper showed a better fit to the Langmuir isotherm. The factory tea waste was characterized using Micromeritics ASAP 2020 instrument and results showed that the factory tea waste biosorbent consists of mesopores with the diameter and width of 4.85205 and 2.546985 nm, respectively.

scholarly journals A highly efficient polyampholyte hydrogel sorbent based fixed-bed process for heavy metal removal in actual industrial effluent

2016 ◽  
Vol 89 ◽  
pp. 151-160 ◽  
Author(s):  
Guiyin Zhou ◽  
Jinming Luo ◽  
Chengbin Liu ◽  
Lin Chu ◽  
Jianhong Ma ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Fixed Bed ◽  
Industrial Effluent ◽  
Highly Efficient

scholarly journals Heavy Metal Ion Adsorption Properties of Methacrylamidocysteine-Containing Porous Poly(Hydroxyethyl Methacrylate) Chelating Beads

2002 ◽  
Vol 20 (7) ◽  
pp. 607-617 ◽  
Author(s):  
Adil Denizli ◽  
Bora Garipcan ◽  
Sibel Emir ◽  
Süleyman Patir ◽  
Ridvan Say
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Metal Removal ◽  
Ph Value ◽  
Heavy Metal Removal ◽  
Ion Concentration ◽  
Heavy Metal Ion ◽  
Adsorption Capacities

Details of the adsorption performance of poly(2-hydroxyethylmethacrylate–methacrylamidocysteine) [p(HEMA–MAC)] beads towards the removal of heavy metal ions from aqueous solution were studied. The metal-complexing ligand and/or co-monomer MAC was newly synthesized from methylacrylochloride and cysteine. Spherical beads of average size 150–200 mm were obtained by the radical suspension polymerization of MAC and HEMA conducted in an aqueous dispersion. The p(HEMA–MAC) beads obtained had a specific surface area of 18.9 m2/g. p(HEMA–MAC) beads were characterized by swelling studies, FT-IR spectroscopy and elemental analysis. Such beads with a swelling ratio of 72%, and containing 3.9 mmol MAC/g, were used for heavy metal removal studies. The adsorption capacities of the beads for selected metal ions, i.e. CdII, AsIII, CrIII, HgII and PbII, were investigated in aqueous media containing different amounts of these ions (10–750 mg/l) and at different pH values (3.0–7.0). The adsorption rate was fast in all cases. The maximum adsorption capacities of the p(HEMA–MAC) beads were 1058.2 mg/g for CdII, 123.4 mg/g for AsIII, 199.6 mg/g for CrIII, 639.1 mg/g for PbII and 1018.6 mg/g for HgII. On a molar basis, the following affinity order was observed: CdII > HgII > CrIII > PbII >AsIII. The adsorption capacity of the MAC-incorporated beads was affected significantly by the pH value of the aqueous medium. The adsorption of heavy metal ions from artificial wastewater was also studied. In this case, the adsorption capacities were 52.2 mg/g for CdII, 23.1 mg/g for CrIII, 83.4 mg/g for HgII, 62.6 mg/g for PbII and 11.1 mg/g for AsIII at an initial metal ion concentration of 0.5 mmol/l. The chelating beads could be regenerated easily with a higher effectiveness by 0.1 M HNO3. These features make p(HEMA–MAC) beads potential candidates for heavy metal ion removal at high capacity.

scholarly journals Fixed-Bed Column Adsorption Studies of Lead (II) From Aqueous Solution Using Chitosan -G-Maleic Anhydride-G-Methacrylic Acidcopolymer

2020 ◽  
pp. 316-334
Keyword(s):  
Aqueous Solution ◽  
Maleic Anhydride ◽  
Metal Ion ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Continuous Adsorption ◽  
Bed Height ◽  
Column Adsorption ◽  
Dynamics Models

The adsorption of Lead (II) from aqueous solution by chitosan-g-maleic anhydride-g-methacrylic acidcopolymer was investigated in fixed- bed column.The continuous adsorption varying the effect of flow rates, bed height and concentration and breakthrough curves was evaluated and it was also analyzed by dynamics models namely, Boharts and Adam, Thomas and Yoon and Nelson models at different conditions.The breakthrough data fitted well to Thomas and Yoon Nelson models with high correlation coefficient, R 2 is 0.9835. The highest bed capacity of chitosan-g-maleicanhydride-g-methacrylicacid adsorbent was obtained using 1 ml /min flow rate, 100 ppm inlet Pb metal ion concentration, and 3 cm bed height

scholarly journals Kinetic Studies of Heavy Metal Removal from Industrial Wastewater by Using Natural Zeolite

2021 ◽  
Vol 5 (1) ◽  
pp. 18-25
Author(s):  
Ali Mohammed Salih ◽  
Craig Williams ◽  
Polla Khanaqa
Keyword(s):  
Heavy Metals ◽  
Natural Zeolite ◽  
Industrial Wastewater ◽  
Metal Ion ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Solution Concentration ◽  
Ion Concentration ◽  
Solution Ph ◽  
Removal Of Heavy Metals

The present work involves the study of the removal of Cu2+, Fe3+, Pb2+ and Zn2+ from synthetic metal solutions using natural zeolite. Laboratory experiments were used to investigate the efficiency of adsorbents in the uptake of heavy metals from industrial wastewater. The kinetic study was used to identify the effect of parameters that affect the rate of adsorption and evaluated their impact on the efficiency of the zeolite in the removal of heavy metals from industrial wastewater. Natural zeolite (clinoptilolite) as adsorbent contacted with multi-component synthetic solutions containing Cu2+, Fe3+, Pb2+ and Zn2+ ions without any pre-modifications and every hour 15 ml of the samples were filtered and taken for metal ion concentration analysis using the ICP-OES. The pH values were monitored and adjusted regularly. The results showed that the capacity of the adsorbents for the removal of heavy metals increased with a greater mass of absorbent, increased initial solution pH, increased agitation speed and higher solution concentration.

scholarly journals Self-Supported Reduced Graphene Oxide Membrane and Its Cu2+ Adsorption Capability

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 146
Author(s):  
Yangjinghua Yu ◽  
Zhong Wang ◽  
Runjun Sun ◽  
Zhihua Chen ◽  
Meicheng Liu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Metal Ion ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Ion Concentration ◽  
Order Kinetic ◽  
Supported Membrane ◽  
Reduced Graphene

Graphene stratiform membrane materials have been recently applied to heavy metal removal in aqueous systems via adsorption due to their high mechanical strength, chemical stability, and other properties. We applied reduced graphene oxide (rGO) alone as an adsorbent to remove heavy metal ions from wastewater. Self-supported rGO membrane was prepared using a green reduction method with sodium hydrosulfite. We used the Raman spectra to observe the structure of the rGO membrane. The morphology of the self-supported membrane was measured by a scanning electron microscope. The Cu2+ adsorption performance was measured in terms of pH, reaction time, metal ion concentration, and temperature. The maximum Cu2+ adsorption capacity of the rGO membrane was found to be 149.25 mg/g. The adsorption process followed a pseudo-second-order kinetic model, and adsorption isotherms were simulated by the Freundlich model.

Pillararenes as macrocyclic hosts: a rising star in metal ion separation

2019 ◽  
Vol 55 (55) ◽  
pp. 7883-7898 ◽  
Author(s):  
Lixi Chen ◽  
Yimin Cai ◽  
Wen Feng ◽  
Lihua Yuan
Keyword(s):  
Heavy Metal ◽  
Metal Ion ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Supramolecular Materials ◽  
Feature Article ◽  
Ion Separation

This feature article reviews the development of functionalized pillararenes as supramolecular materials for lanthanide and actinide separation and heavy metal removal.

scholarly journals Biosorption of Cadmium by Fucus spiralis

2004 ◽  
Vol 1 (3) ◽  
pp. 180 ◽  
Author(s):  
Manuel Esteban Sastre de Vicente ◽  
Roberto Herrero ◽  
Pablo Lodeiro ◽  
Bruno Cordero
Keyword(s):  
Heavy Metals ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Biological Materials ◽  
Ion Concentration ◽  
Adsorption Parameters ◽  
Solution Ph ◽  
Biosorption Process ◽  
Fucus Spiralis ◽  
Biosorption Kinetics

Environmental Context. Conventional processes for the removal of heavy metals from wastewaters generally involves chemical precipitation of metals (changing the pH) followed by a period to allow the metal precipitates to settle and be separated. These processes are inefficient when the metals are at a low concentration and still demand handling and disposal of toxic metal sludges. An alternative method for heavy metal removal is adsorption onto a biological material, biosorption. The biological materials, including agricultural byproducts, bacteria, fungi, yeast, and algae, all which take up heavy metals in substantial quantities, are relatively inexpensive, widely available, and from renewable sources. However, biological materials are complex and the active mechanisms often unclear. Abstract. Cadmium biosorption properties of nonliving, dried brown marine macroalga Fucus spiralis from Galician coast (northwest Spain) have been investigated. The biosorption capacity of the alga strongly depends on solution pH; the uptake is almost negligible at pH ≤ 2 and reaches a plateau at around pH 4.0. Cadmium biosorption kinetics by F. spiralis is relatively fast, with 90% of total adsorption taking place in less than one hour. A pseudo second order mechanism has been proved to be able to predict the kinetic behaviour of the biosorption process. The effect of initial cadmium ion concentration, alga dose, solution pH, and temperature on the biosorption kinetics has been studied. The Langmuir, Freundlich, Langmuir–Freundlich, and Tóth isotherms were used to fit the experimental data and to find out the adsorption parameters. Acid–base properties of the alga have been studied potentiometrically in order to calculate the number of acidic groups and the apparent pK value by using Katchalsky model. The pK obtained is comparable with typical values associated to the ionization of carboxyl groups of alginates, supporting the implication of these groups in the biosorption process.

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