Investigation of copper removal efficiency on reclaimed wafers with HF-based solutions

2004 ◽  
Vol 71 (3-4) ◽  
pp. 310-320 ◽  
Author(s):  
A. Abbadie ◽  
S. Favier ◽  
C. Giroud ◽  
T. Billon
Keyword(s):  
Removal Efficiency ◽  
Copper Removal

scholarly journals Electrochemical removal of copper from a simulated wastewater using a rotating tubular packed bed of woven screens electrode

2019 ◽  
Vol 12 (2) ◽  
pp. 127-134
Author(s):  
Jenan Hussein Hemeidan ◽  
Ali H. Abbar
Keyword(s):  
Removal Efficiency ◽  
Process Parameters ◽  
Copper Concentration ◽  
Rotation Speed ◽  
Packed Bed ◽  
Electrochemical Reactor ◽  
Copper Removal ◽  
A Value ◽  
Optimization Of Process Parameters ◽  
Simulated Wastewater

Copper removal from a simulated wastewater was investigated by using rotating tubular packed bed of woven screens electrode as a cathode in a new design of electrochemical reactor. Effects of electrolysis operating parameters like current (0.5–2.5 A), rotation speed (150–750 rpm), and initial copper concentration (100–500ppm) were investigated. Optimization of process parameters was carried out by adopting response surface methodology (RSM) combined with Box–Behnken Design (BBD) where copper removal efficiency was selected as a response function. The results indicated that current has the main effect on the copper removal efficiency followed by rotation speed and concentration. The results of regression analysis revealed that the experimental data could be fitted to a second-order polynomial model with a value of determination coefficient (R2) equal to 0.9894 and Fisher test at value of 51.57 for. The optimum conditions of the process parameters based on RSM method were an initial copper concentration of 205 ppm, current of 2.5A, and rotation speed of 750 rpm utilizing cathode composed of screens with mesh no. 30 where a final copper concentration less than 2 ppm was obtained after 30 min.

scholarly journals Synthesis of Zeolites from Greek Fly Ash and Assessment of Their Copper Removal Capacity

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 844
Author(s):  
Aikaterini Vavouraki ◽  
Georgios Bartzas ◽  
Konstantinos Komnitsas
Keyword(s):  
Fly Ash ◽  
Removal Efficiency ◽  
Analytical Techniques ◽  
Copper Removal ◽  
Concerted Action ◽  
Xps Spectra ◽  
Removal Capacity ◽  
Lignite Fly Ash ◽  
Pseudo Second Order ◽  
Second Order Equations

The objective of this study was to synthesize zeolites through fusion of lignite fly ash and NaOH or KOH pellets at 600 °C and assess their removal efficiency in terms of decontamination of solutions containing Cu(II) ions. The removal efficiency of the produced zeolites was tested in batch kinetic experiments using different zeolites and Cu(II) ion concentrations. Experimental data revealed that zeolites synthesized with the use of NaOH exhibited higher removal efficiency compared with those synthesized with the use of KOH. Kinetic data showed that the pseudo-second-order equations described well the removal process. Copper removal was mainly accomplished through the concerted action of chemisorption and intraparticle diffusion. Analytical techniques involving XRF, XRD, FTIR, SEM/EDS and XPS were used for the characterization and morphology analysis of the produced zeolites. SEM/EDS confirmed the presence of copper on the zeolite surface. XPS spectra of Cu2p at 934.3 eV proved the presence of Cu(II) oxidation state, confirming the possible formation of CuO and/or Cu-Cl.

Integration of polyelectrolyte enhanced ultrafiltration and chemical reduction for metal-containing wastewater treatment and metal recovery

2015 ◽  
Vol 72 (7) ◽  
pp. 1096-1101 ◽  
Author(s):  
Jui-Hsuan Yu ◽  
Yi-Hsuan Chou ◽  
Yang-Min Liang ◽  
Chi-Wang Li
Keyword(s):  
Removal Efficiency ◽  
Ph Value ◽  
Chemical Reduction ◽  
Sample Pretreatment ◽  
Particle Size Analysis ◽  
Reduction Reaction ◽  
Copper Removal ◽  
Molar Ratio ◽  
Size Analysis ◽  
Copper Particles

Chemical reduction was firstly employed to treat synthetic wastewaters of various compositions prepared to simulate the retentate stream of polyelectrolyte enhanced ultrafiltration (PEUF). With fixed Cu:polyethylenimine (PEI) monomer:dithionite molar ratio, increasing copper concentration increases copper removal efficiency. Under fixed Cu:dithionite molar ratio and fixed Cu concentration, increasing PEI monomer:copper molar ratio decreases copper removal efficiency. The formation of nano-sized copper particles, which readily pass through 0.45 μm filter used for sample pretreatment before residual copper analysis, might be the reason behind the decreasing copper removal efficiency observed. Particle size analysis shows that the size of copper particles, which are formed through reduction reaction, increases with decreasing pH value and increasing reaction time. As ultrafiltration is capable of removing these nano-sized particles, integration of chemical reduction and PEUF is proposed to simultaneously achieve regeneration of polyelectrolyte and recovery of copper in one process. Results show that the proposed process could achieve almost complete copper removal without being affected by reaction pH.

Optimization of copper removal from aqueous solutions in a continuous electrochemical cell divided by cellulosic separator

2016 ◽  
Vol 75 (5) ◽  
pp. 1233-1242 ◽  
Author(s):  
Ali Asghar Najafpoor ◽  
Mojtaba Davoudi ◽  
Elham Rahmanpour Salmani
Keyword(s):  
Energy Consumption ◽  
Aqueous Solutions ◽  
Removal Efficiency ◽  
Copper Concentration ◽  
Electrochemical Cell ◽  
Current Intensity ◽  
Copper Removal ◽  
Flow Mode ◽  
Electrolysis Time ◽  
Optimal Conditions

Copper, as an inseparable part of many industrial discharges, threatens both public and environmental health. In this work, an electrochemical cell utilizing a cellulosic separator was used to evaluate Cu removal using graphite anodes and stainless steel cathodes in a continuous-flow mode reactor. In the experimental matrix, Cu concentration (1–5 mg L−1), electrolysis time (20–90 min), and current intensity (0.1–0.4 A) were employed. Results showed that the maximum removal efficiency of copper was obtained as 99%. The removal efficiency was independent of initial copper concentration and directly related to electrolysis time and current intensity. Energy consumption was more dependent on current intensity than electrolysis time. Under optimal conditions (75.8 min electrolysis time, 0.18 A current intensity, and 3 mg L−1 copper concentration), the removal efficiency was obtained as 91% while 7.05 kWh m−3 electrical energy was consumed. The differences between the actual and predicted data under optimal conditions were 0.42% for copper removal and 0.23% for energy consumption, which signify the performance and reliability of the developed models. The results exhibited the suitability of the electrochemical reduction for copper removal from aqueous solutions, which was facilitated under alkaline conditions prevailing in the cathodic compartment due to applying a cell divided by a cellulosic separator.

scholarly journals Evaluation of copper removal efficiency using water treatment sludge

2019 ◽  
Vol 12 (1) ◽  
pp. 37-44 ◽  
Author(s):  
Shimaa A. Shahin ◽  
Mohamed Mossad ◽  
Moharram Fouad
Keyword(s):  
Water Treatment ◽  
Removal Efficiency ◽  
Copper Removal ◽  
Water Treatment Sludge

scholarly journals Copper Analysis by Two Different Procedures of Sequential Extraction after Electrodialytic Remediation of Mine Tailings

2019 ◽  
Vol 16 (20) ◽  
pp. 3957
Author(s):  
Andrea Lazo ◽  
Pamela Lazo ◽  
Alejandra Urtubia ◽  
María Gabriela Lobos ◽  
Claudia Gutiérrez ◽  
...  
Keyword(s):  
Sequential Extraction ◽  
Removal Efficiency ◽  
Mine Tailings ◽  
Copper Concentration ◽  
Soluble Fraction ◽  
Copper Removal ◽  
Leaching Solution ◽  
Initial Content ◽  
Complete Cell ◽  
A Current

The analysis of Cu distribution in pre-treated mine tailings after electrodialytic remediation was carried out by using two methods of sequential extraction. The initial content of copper in the tailings was 1109 mg Cu/kg of dry tailing, where close to 40% of the sample in weight corresponded to a soluble fraction. The tailing was treated with a leaching solution for 24 h. Three different solutions were tested: H2SO4 + HNO3 with pH = 1.9; H2SO4 + HNO3 with pH = 4.2; and NH4Cl 0.8 mol/L with pH = 5.5. After that, electrodialytic remediation experiments were carried out using an electric field of 2.7 V/cm for 15 days. The best performance for the complete cell was obtained with H2SO4 + HNO3 solutions, with a copper removal efficiency in the range of 62% to 67% and a current efficiency between 6% and 9%. The results of the remaining copper concentration between anode and cathode, from both procedures of sequential extraction, showed similar trends. The differences were mainly attributed to the use of different extractant solutions and extraction times. Soluble and exchangeable fractions were easily removed, with efficiencies higher than 80%. The lowest copper removal efficiency was obtained with NH4Cl 0.8 mol/L.

Degradation of 2,4-dichlorophenol by melamine amine celluloseimmobilized lacasses

TAPPI Journal ◽  
2017 ◽  
Vol 16 (10) ◽  
pp. 559-564 ◽  
Author(s):  
ZHEN WANG ◽  
PINGPING BIN ◽  
YING LIU ◽  
YU LIU ◽  
GUIHUA YANG ◽  
...  
Keyword(s):  
Enzymatic Activity ◽  
Removal Efficiency ◽  
Immobilized Laccase ◽  
Dialdehyde Cellulose

Epoxidized dialdehyde cellulose (EDC) was prepared and grafted with melamine to obtain melamine grafted epoxidized dialdehyde cellulose (EDC-melamine); the products were characterized by various methods and were used as carriers to immobilize laccase. Results show EDC-melamine can immobilize laccase effectively and have higher enzymatic activity compared with EDC. Furthermore, the enzymatic activity of EDC-melamine was found to be as high as 865 U•mg-1, compared with 140U•mg-1 for EDC. The removal efficiency of 2,4-dichlorophenol (2,4-DCP) for EDC-melamine immobilized laccase was about 71.5% at 40°C for 4 h at 10.0 mg•L-1 and dosage of laccase = 0.2 g/L. The removal efficiency can remain greater than 63%, even after six cycles.

The assessment of particulate matter (PM2.5) removal efficiency on air cleaner products through full scale test in Korea

2019 ◽  
Vol 18 (1) ◽  
pp. 76-80 ◽  
Author(s):  
Kichul Kim ◽  
Pil-Ju Park ◽  
Soomi Eo ◽  
Seungmi Kwon ◽  
Kwangrae Kim ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Removal Efficiency ◽  
Full Scale ◽  
Full Scale Test ◽  
Air Cleaner ◽  
Scale Test
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