Adsorption Studies of Citrus maxima (Pomelo) Fruit Peels in the Removal of Lead (II) from Aqueous Solution

2015 ◽  
Vol 799-800 ◽  
pp. 37-41
Author(s):  
Eduardo R. Magdaluyo ◽  
Mark Gilbert B. Baltazar
Keyword(s):  
Aqueous Solution ◽  
Surface Morphology ◽  
Design Of Experiment ◽  
Lead Adsorption ◽  
Adsorption Time ◽  
Adsorption Studies ◽  
Adsorbate Concentration ◽  
Infrared Spectral ◽  
Citrus Maxima ◽  
Percent Removal

The ability of Citrus maxima or pomelo fruit peels for the removal of lead (II) ions in water was investigated. The influence of the different parameters such as pH, adsorption time, initial adsorbate concentration and adsorbent dosage in the adsorption characteristics was evaluated following the factorial design of experiment. Infrared spectral analyses of the adsorbent revealed the presence of hydroxyl and carboxyl bands in the structural backbone. Presence of plate-like and non-uniformity surface morphology can also be observed. Lead favors neutral to weakly basic conditions to achieve high percent removal. Lead adsorption studies in Citrus maxima followed the Temkin isotherm.

scholarly journals Adsorption of Pb2+ from waste water using modified and unmodified plantain pseudo stem waste as adsorbent

2021 ◽  
Vol 3 (1) ◽  
pp. 093-096
Author(s):  
Idongesit O Ekpenyong ◽  
Effiong J Okon ◽  
Kufre E Essien ◽  
Okon E Okon
Keyword(s):  
Waste Water ◽  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Powdered Sample ◽  
Fenton Reagent ◽  
Adsorption Studies ◽  
Adsorption Capacities ◽  
Increase With Increase ◽  
Adsorbate Concentration

This study was carried out to evaluate the potentials of plantain pseudo stem waste as adsorbent in the removal of Pb2+ from aqueous solution. Filament obtained from Plantain pseudo stem were dried, cut into chips and ground using electric grinder. The powdered sample obtained was soaked in ethanol for 24 hours and wash with water several times to remove the extractive component. It was then dried in the oven. Modification reaction was carried out on the powdered sample using Fenton reagent (Fe2+/H2O2). Both the modified and unmodified adsorbents were used for the adsorption of Pb2+ from aqueous solution. Factors considered were effect of contact time and effect of adsorbate (Pb2+) concentrations. The results revealed that in all the adsorption studies, the adsorption capacity of modified adsorbent was higher than that of the unmodified adsorbent. However, adsorption capacities increase with increase in contact time and decreases with increase in the adsorbate concentration.

Adsorption Studies of Basic Green 4 from Aqueous Solution on Ca2+Exchanged Clay

2011 ◽  
Vol 48 (5) ◽  
pp. 366-374 ◽  
Author(s):  
F. K. Bangash ◽  
S. Alam ◽  
M. Khan
Keyword(s):  
Aqueous Solution ◽  
Adsorption Studies

scholarly journals Fabrication of Transparent Mg(OH)2 Thin Films by Drop-Dry Deposition

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 724
Author(s):  
Tong Li ◽  
Masaya Ichimura
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Optical Properties ◽  
Surface Morphology ◽  
Magnesium Hydroxide ◽  
Dry Deposition ◽  
Visible Range ◽  
Substrate Heating ◽  
Water Effects ◽  
Deposition Conditions

Magnesium hydroxide (Mg(OH)2) thin films were deposited by the drop-dry deposition (DDD) method using an aqueous solution containing Mg(NO3)2 and NaOH. DDD was performed by dropping the solution on a substrate, heating-drying, and rinsing in water. Effects of different deposition conditions on the surface morphology and optical properties of Mg(OH)2 thin films were researched. Films with a thickness of 1−2 μm were successfully deposited, and the Raman peaks of Mg(OH)2 were observed for them. Their transmittance in the visible range was 95% or more, and the bandgap was about 5.8 eV. It was found that the thin films have resistivity of the order of 105 Ωcm. Thus, the transparent and semiconducting Mg(OH)2 thin films were successfully prepared by DDD.

Nanostructured Didymosphenia geminata-based membrane for efficient lead adsorption from aqueous solution

2021 ◽  
Vol 9 (4) ◽  
pp. 105269
Author(s):  
Elias Reinoso-Guerra ◽  
Juliet Aristizabal ◽  
Bárbara Arce ◽  
Elsie Zurob ◽  
Geraldine Dennett ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Lead Adsorption ◽  
Didymosphenia Geminata

scholarly journals Evaluation of removal efficiency of residual diclofenac in aqueous solution by nanocomposite tungsten-carbon using design of experiment

2017 ◽  
Vol 76 (6) ◽  
pp. 1466-1473 ◽  
Author(s):  
M. H. Salmani ◽  
M. Mokhtari ◽  
Z. Raeisi ◽  
M. H. Ehrampoush ◽  
H. A. Sadeghian
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Design Of Experiment ◽  
High Efficiency ◽  
Carbon Powder ◽  
Batch Adsorption ◽  
Effective Parameters ◽  
Initial Concentration ◽  
Carbon Nanocomposite ◽  
Maximum Removal

Wastewater containing pharmaceutical residual components must be treated before being discharged to the environment. This study was conducted to investigate the efficiency of tungsten-carbon nanocomposite in diclofenac removal using design of experiment (DOE). The 27 batch adsorption experiments were done by choosing three effective parameters (pH, adsorbent dose, and initial concentration) at three levels. The nanocomposite was prepared by tungsten oxide and activated carbon powder in a ratio of 1 to 4 mass. The remaining concentration of diclofenac was measured by a spectrometer with adding reagents of 2, 2′-bipyridine, and ferric chloride. Analysis of variance (ANOVA) was applied to determine the main and interaction effects. The equilibrium time for removal process was determined as 30 min. It was observed that the pH had the lowest influence on the removal efficiency of diclofenac. Nanocomposite gave a high removal at low concentration of 5.0 mg/L. The maximum removal for an initial concentration of 5.0 mg/L was 88.0% at contact time of 30 min. The results of ANOVA showed that adsorbent mass was among the most effective variables. Using DOE as an efficient method revealed that tungsten-carbon nanocomposite has high efficiency in the removal of residual diclofenac from the aqueous solution.

Adsorption studies on removal of cadmium (ii) From aqueous solution

2017 ◽  
pp. 165-177
Author(s):  
P. Akhila Swanthanthra ◽  
S. Nawaz Bahamani ◽  
Bhavana ◽  
P. Rajesh Kumar
Keyword(s):  
Aqueous Solution ◽  
Adsorption Studies

scholarly journals How alkali-activated Ti surfaces affect the growth of tethered PMMA chains: a close-up study on the PMMA thickness and surface morphology

2019 ◽  
Vol 91 (10) ◽  
pp. 1687-1694
Author(s):  
Melania Reggente ◽  
Sebastien Kriegel ◽  
Wenjia He ◽  
Patrick Masson ◽  
Geneviève Pourroy ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Reaction Time ◽  
Surface Morphology ◽  
Methyl Methacrylate ◽  
Phosphonic Acid ◽  
Coupling Agent ◽  
Alkali Activation ◽  
Oh Groups ◽  
Radical Polymerisation ◽  
Alkali Activated

Abstract The alkali-activation of titanium (Ti) surfaces performed in a heated sodium hydroxide (NaOH) aqueous solution, results in a porous layer rich in hydroxyl (OH) groups, the structure and porosity of which strongly depend on the reaction time and NaOH concentration used. In this study, a polymerization initiator is covalently grafted on the alkali-activated Ti substrates by using a phosphonic acid as coupling agent and the resulting surfaces are used as scaffolds to drive the growth of tethered poly(methyl methacrylate) (PMMA) chains via a surface initiated atom transfer radical polymerisation (SI-ATRP). A close-up investigation of how different treatment times (1 h, 3 h, 6 h, 12 h, and 24 h) and NaOH concentrations (0.1 M, 0.5 M, 1 M, 2 M, and 5 M) affect the final PMMA morphology and thickness are presented.

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