Removal of arsenic from water using crumpled graphite oxide

2018 ◽  
Vol 7 (5) ◽  
pp. 404-408
Author(s):  
Ha Xuan Son ◽  
Pham Van Hao ◽  
Hac Van Vinh ◽  
Nguyen Thanh Hai ◽  
Nguyen Thi Kim Ngan ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Contact Time ◽  
Water Environment ◽  
Contaminated Water ◽  
Maximum Adsorption Capacity ◽  
Plasma Electrolysis ◽  
Langmuir Isotherm Model ◽  
Cathodic Plasma ◽  
Removal Of Arsenic ◽  
Graphite Oxides

Abstract In this work, we fabricated crumpled graphite oxides (CGOs) from discharged electrodes of waste batteries by the cathodic plasma electrolysis process and applied it for arsenic (As) removal from water solutions. Several factors that affect the removal efficiency of As(III) were investigated, including pH, initial concentrations, and contact time. After 120 min of experiment [10 mg of CGO in 40 ml of 1 mg/l As(III) solution], the removal efficiency reached to as high as 98.6%. From the Langmuir isotherm model, the calculated maximum adsorption capacity (qmax) was found to be 47.39 mg/g. The results from this study showed that CGOs could be an effective adsorbent for As(III) removal from the water environment and acts as a promising adsorbent for other heavy metals from contaminated water.

scholarly journals REMOVAL OF Cd(II) FROM AQUEOUS SOLUTIONS BY CRUMPLED GRAPHITE OXIDE

2018 ◽  
Vol 55 (4C) ◽  
pp. 8
Author(s):  
Ha Xuan Son
Keyword(s):  
Aqueous Solutions ◽  
Graphite Electrode ◽  
Polluted Water ◽  
Maximum Adsorption Capacity ◽  
Aqueous Environment ◽  
Plasma Electrolysis ◽  
Effects Of Ph ◽  
Electrolysis Method ◽  
Cathodic Plasma ◽  
Graphite Oxides

In this study, crumpled graphite oxides (CGOs) were fabricated from graphite electrode of exhausted dry batteries (RG) by cathodic plasma electrolysis method (CPE) and applied for removing Cd(II) from aqueous solutions. The effects of pH, contact time, and initial concentrations on the removal of Cd(II) ions were studied. A removal efficiency of ∼98 % was obtained after 120 min, via the dispersion of 15 mg of CGO in Cd(II) solutions (40 mL, 1 ppm) at pH 6. The maximum adsorption capacity (qmax) was calculated to be 40.82 mg/g. Results showed that CGO is an effective adsorbent for the removal of Cd(II) from aqueous environment and acts as a promising adsorbent for the removal of other heavy metals from the polluted water.

Parameters Affecting Dye Adsorption - Using Graphene Coated Sand (GSC)

2018 ◽  
Vol 4 (02) ◽  
Author(s):  
Seroor Atalah Khaleefa Alia ◽  
Dr. Mohammed Ibrahimb ◽  
Hussein Ali Hussein
Keyword(s):  
Heavy Metals ◽  
Contact Time ◽  
Organic Dyes ◽  
Low Cost ◽  
Dye Adsorption ◽  
Contaminated Water ◽  
Maximum Adsorption Capacity ◽  
Engineering Designs ◽  
Heavy Metals Ions ◽  
Coated Sand

Adsorption is most commonly applied process for the removal of pollutants such as dyes and heavy metals ions from wastewater. The present work talks about preparing graphenic material attached sand grains called graphene sand composite (GSC) by using ordinary sugar as a carbon source. Physical morphology and chemical composition of GSC was examined by using (FTIR, SEM, EDAX and XRD). Efficiency of GSC in the adsorption of organic dyes from water was investigated using reactive green dye with different parameters such as (ph, temperature, contact time and dose). Adsorption isotherm was also studied and the results showed that the maximum adsorption capacity of dye is 28.98 mg/g. This fast, low-cost process can be used to manufacture commercial filters to treat contaminated water using appropriate engineering designs.

scholarly journals Removal of arsenic and iron removal from drinking water using coagulation and biological treatment

2015 ◽  
Vol 14 (1) ◽  
pp. 90-96 ◽  
Author(s):  
Biplob Kumar Pramanik ◽  
Sagor Kumar Pramanik ◽  
Fatihah Suja
Keyword(s):  
Drinking Water ◽  
Removal Efficiency ◽  
Contact Time ◽  
Moringa Oleifera ◽  
Biological Activated Carbon ◽  
Dissolved Organics ◽  
Reduction Efficiency ◽  
Aerated Filter ◽  
Removal Of Arsenic ◽  
Maximum Removal

Effects of biological activated carbon (BAC), biological aerated filter (BAF), alum coagulation and Moringa oleifera coagulation were investigated to remove iron and arsenic contaminants from drinking water. At an initial dose of 5 mg/L, the removal efficiency for arsenic and iron was 63% and 58% respectively using alum, and 47% and 41% respectively using Moringa oleifera. The removal of both contaminants increased with the increase in coagulant dose and decrease in pH. Biological processes were more effective in removing these contaminants than coagulation. Compared to BAF, BAC gave greater removal of both arsenic and iron, removing 85% and 74%, respectively. Longer contact time for both processes could reduce the greater concentration of arsenic and iron contaminants. The addition of coagulation (at 5 mg/L dosage) and a biological process (with 15 or 60 min contact time) could significantly increase removal efficiency, and the maximum removal was observed for the combination of alum and BAC treatment (60 min contact time), with 100% and 98.56% for arsenic and iron respectively. The reduction efficiency of arsenic and iron reduced with the increase in the concentration of dissolved organics in the feedwater due to the adsorption competition between organic molecules and heavy metals.

scholarly journals Application of new biosorbent based on chemicaly modified Lagenaria vulgaris shell for the removal of copper(II) from aqueous solutions: Effects of operational parameters

2013 ◽  
Vol 67 (4) ◽  
pp. 559-567 ◽  
Author(s):  
Milos Kostic ◽  
Miljana Radovic ◽  
Jelena Mitrovic ◽  
Danijela Bojic ◽  
Dragan Milenkovic ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Low Cost ◽  
Batch Process ◽  
Maximum Adsorption Capacity ◽  
Operational Parameters ◽  
Initial Ph ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Process Mode ◽  
Lagenaria Vulgaris

In present study a low cost biosorbent derived from Lagenaria vulgaris plant by xanthation, was tested for its ability to remove copper from aqueous solution. The effect of contact time, initial pH, initial concentration of copper(II) ions and adsorbent dosage on the removal efficiency were studied in a batch process mode. The optimal pH for investigated metal was 5. A dosage of 4 g dm-3 of xanthated Lagenaria vulgaris biosorbent (xLVB) was found to be effective for maximum uptake of copper(II). The kinetic of sorption of metal was fast, reaching at equilibrium in 50 min. The kinetic data were found to follow closely the pseudo-second-order model. The adsorption equilibrium was described well by the Langmuir isotherm model with maximum adsorption capacity of 23.18 mg g-1 copper(II) ions on xLVB. The presence of sulfur groups on xLVB were identified by FTIR spectroscopic study. Copper removal efficiency was achieved at 81.35% from copper plating industry wastevater.

scholarly journals Gum Arabic-Magnetite Nanocomposite as an Eco-Friendly Adsorbent for Removal of Lead(II) Ions from Aqueous Solutions: Equilibrium, Kinetic and Thermodynamic Studies

Separations ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 224
Author(s):  
Ismat H. Ali ◽  
Mutasem Z. Bani-Fwaz ◽  
Adel A. El-Zahhar ◽  
Riadh Marzouki ◽  
Mosbah Jemmali ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solutions ◽  
Contact Time ◽  
Gum Arabic ◽  
Ion Concentration ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Transmission Electron ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model

In this study, a gum Arabic-magnetite nanocomposite (GA/MNPs) was synthesized using the solution method. The prepared nanocomposite was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and thermogravimetric analysis (TGA). The prepared composite was evaluated for the adsorption of lead(II) ions from aqueous solutions. The controlling factors such as pH, contact time, adsorbent dose, initial ion concentration, and temperature were investigated. The optimum adsorption conditions were found to be 0.3 g/50 mL, pH = 6.00, and contact time of 30 min. The experimental data well fitted the pseudo-second-order kinetic model and the Langmuir isotherm model. The maximum adsorption capacity was determined as 50.5 mg/g. Thermodynamic parameters were calculated postulating an endothermic and spontaneous process and a physio-sorption pathway.

scholarly journals Statistical Optimization of As(V) Adsorption Parameters onto Epichlorohydrin/Fe3O4 Crosslinked Chitosan Derivative Nanocomposite using Box-Behnken Design

2021 ◽  
Vol 68 (4) ◽  
pp. 997-1007
Author(s):  
Vijayanand Nagarajan ◽  
Raja Ganesan ◽  
Srinivasan Govindan ◽  
Prabha Govind
Keyword(s):  
Contact Time ◽  
Real Life ◽  
Ion Concentration ◽  
P Value ◽  
Maximum Adsorption Capacity ◽  
Adsorption Parameters ◽  
Solution Ph ◽  
Chi Square ◽  
Box Behnken Design ◽  
Removal Of Arsenic

In this study, Box-Behnken design (BBD) in response surface methodology (RSM) was employed to optimize As(V) removal from an aqueous solution onto synthesized crosslinked carboxymethylchitosan-epichlorohydrin/Fe3O4 nanaocomposite. The factors like solution pH, adsorbent dose, contact time and temperature were optimized by the method which shows high correlation coefficient (R2 = 0.9406), and a predictive quadratic polynomial model equation. The adequacy of the model and parameters were evaluated by analysis of variance (ANOVA) with their significant factors of Fischer’s F-test (p < 0.05). Seven significant parameters with interaction effects in the experiment with p-value < 0.0001 was observed, having a maximum removal efficiency of As(V) is 95.1%. Optimal conditions of dosage, pH, temperature, initial ion concentration and contact time in the process were found to be 0.7 g, pH 6.5, 308K, 10 mg/L and 60 min respectively. Langmuir isotherm model fitted better than the Freundlich model having a maximum adsorption capacity of 28.99 mg/g, a high regression value of 0.9988, least chi-square value of 0.1781. The process was found to follow monolayer adsorption and pseudo-second-order kinetics. Thermodynamic parameters indicate the process is spontaneous, endothermic and physisorption in nature. Successful regeneration of the adsorbent implies its applicability to the removal of arsenic from real life wastewater.

Removal of Cr(VI) from Aqueous Solutions Using Clay from Calumbi Geological Formation, N. Sra. Socorro, SE State, Brazil

2018 ◽  
Vol 912 ◽  
pp. 1-6 ◽  
Author(s):  
J.C.T. Rezende ◽  
V.H.S. Ramos ◽  
H.A. Oliveira ◽  
Rosane Maria Pessoa Betânio Oliveira ◽  
E. Jesus
Keyword(s):  
Aqueous Solutions ◽  
Contact Time ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Initial Ph ◽  
Geological Formation ◽  
Langmuir Isotherm Model

Conventional processes for heavy metal removal are costly. Natural and modified clay with quaternary ammonium salt were used as adsorbent for the removal of Cr (VI) from aqueous solutions. Clays were characterized using Fourier transform infrared spectroscopy FTIR, thermal analysis (TG/DTA) and X-ray diffraction (XRD). Cr (VI) determination was conducted by ultraviolet-visible spectrophotometry, using complexation with 1,5-diphenylcarbazide. Absorbance was measured at the wavelength of 540 nm. The experiments were conducted at 25 ± 1 °C; initial Cr (VI) concentration of 4 to 25 mg L-1; initial pH of 2, agitation of 150 rpm; contact time of 120 minutes and clay mass of 0.1 g. Natural and modified clays exhibited a maximum adsorption capacity of 2.548 mg g-1 and 17.24 mg g-1, respectively, in accordance with the Langmuir isotherm model. X-ray diffraction analysis of clay indicated that the sample consists mainly of kaolinite and montmorillonite.

Arsenic Removal by Precipitation with Calcium Phosphate Hydroxyapatite

2012 ◽  
Vol 506 ◽  
pp. 413-416 ◽  
Author(s):  
W. Dungkaew ◽  
K.J. Haller ◽  
A.E. Flood ◽  
J.F. Scamehorn
Keyword(s):  
Calcium Phosphate ◽  
Water Sample ◽  
Removal Efficiency ◽  
Arsenic Removal ◽  
Arsenic Speciation ◽  
Arsenic Concentration ◽  
Contaminated Water ◽  
Low Levels ◽  
Removal Of Arsenic ◽  
Key Parameter

The removal of arsenic from synthetic arsenic contaminated water sample by precipitating arsenic (in the form of arsenate oxyanion) with calcium phosphate hydroxyapatite, HAp, was studied under conditions that induce arsenate incorporated calcium phosphate hydroxyapatite, Ca (P/As)HAp, to form. Arsenate is able to substitute for a fraction of the phosphate in HAp host material as it forms. Consequently, arsenic is successfully removed from the contaminated water achieving up to 99% arsenic removal from 25 ppm initial arsenic concentration. The Ca:(P+As) and P:As mole ratios were found to play an important role in arsenic removal efficiency. Higher Ca:(P+As) and P:As mole ratios give higher arsenic removal efficiency. Surprisingly, the pH of the initial anion solution, a key parameter in arsenic speciation, was found to not have a significant effect on arsenic removal by this process. The advantage of this process is that the precipitation can occur rapidly at relatively low levels of arsenic contamination, implying an easy and inexpensive process for arsenic removal can be developed based on this approach.

Removal of Arsenic from Wastewater by Using Pretreating Orange Peel

2013 ◽  
Vol 773 ◽  
pp. 889-892 ◽  
Author(s):  
Yuan Peng ◽  
Hong Yan Xiao ◽  
Xian Zhong Cheng ◽  
Hong Mei Chen
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Low Cost ◽  
Orange Peel ◽  
Local Fields ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Adsorption Removal ◽  
Removal Of Arsenic

The use of low-cost and eco-friendly adsorbents has been investigated as an ideal alternative to the currentexpensive methods of removing arsenic from wastewater. Orange peel was collected from the local fields of orangetrees and converted into a low-cost adsorbent. The effects of solution pH, contact time, and concentration of orange peel have beenstudied. The maximum adsorption capacity calculated from the Langmuirisotherm model was 43.69 mg g-1,Based on the adsorption capacity, the pretreating orange peel was shown to be promising materials for adsorption removal ofarsenics from aqueous solutions.

scholarly journals Application of Alum Sludge in Phosphate Phosphorus Removal from Contaminated Water

2019 ◽  
Vol 15 (2) ◽  
pp. 141-146
Author(s):  
B Ojha ◽  
R K Sharma ◽  
I. M. Amatya
Keyword(s):  
Adsorption Capacity ◽  
Removal Efficiency ◽  
Phosphorus Removal ◽  
Contact Time ◽  
Average Particle Size ◽  
Contaminated Water ◽  
Average Particle ◽  
Intensity Parameter ◽  
Alum Sludge ◽  
P Removal

This study determines application of alum sludge in phosphate phosphorus (PO43-/P) removal from contaminated water. For the study the alum sludge was collected from Mahankal Water Treatment Plant and dewatered by drying in micro oven under 105°C and crumble to average particle size of 5 mm. 10.7 ppm Synthetic PO43-/P solution was prepared by dissolving Na2HPO4.2H2O. Batch test was conduct to determine the PO43-/P removal efficiency and to develop adsorption isotherm. The phosphorus removal efficiency was tested for 8 g, 16 g, 24 g, 32 g and 40 g alum sludge per L PO43-/P solution for different contact time. The PO43-/P content in the sample solution was determine by L-Ascorbic Acid method using Spectrophotometer (Shimadzu UVmini-12400) in the lab of Pulchowk Campus, Institute of Engineering Tribhuvan University. The PO43-/P removal efficiency was found to be 95.5% for 8 g/L dosing and 98.4% % for 40 g/L. The contact time decreases with increase in dosing 50 min for 8 g/L and 5 min for 40 g/L dosing. The adsorption process best fit Freundlich isotherm with higher correlation coefficient (R2 = 0.87) and Freundlich intensity parameter (1/n) less than unit (1/n = 0.76) upto 50min contact time and beyond 50min contact time intensity parameter (1/n) greater than unit. The adsorption capacity determine from isotherm indicate increase in adsorption capacity with increase in dosing. The adsorption capacity increases from 1.39 to 28.07 mg/g when contract time varies from 1 to 120min.

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