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Hawaiah Imam Maarof
Faculty of Chemical Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
Chemical Engineering, Chemistry & Bioengineering Chemistry

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Electrochemical Removal of Copper Ions Using Coconut Shell Activated Carbon Nur Azza Azyan Muin; Hawaiah Imam Maarof; Nur Alwani Ali Bashah; Nor Aida Zubir; Rasyidah Alrozi; Norhaslinda Nasuha
Indonesian Journal of Chemistry Vol 20, No 3 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (15.71 KB) | DOI: 10.22146/ijc.43077

Abstract

In this work, coconut shell activated carbon (CSAC) electrode was evaluated to remove copper ion via electrochemical processes. CSAC electrode and graphite were applied as the cathode and the anode, respectively. The reusability of the electrode, the effects of initial pH, applied voltage and initial concentration were studied. The electrochemical process was carried out for 3 h of treatment time, and the electrodes (anode and cathode) were separated by 1 cm. The results revealed that CSAC is proven as a reusable electrode to remove copper ion, up to 99% of removal efficiency from an initial concentration of 50 ppm after it had been used three times. From the observation, the removal efficiency was optimum at an initial pH of 4.33 (without any initial pH adjustment). The applied voltage at 8 V showed a higher removal efficiency of copper ion compared to at 5 V.
Adsorption Analysis of Fluoride Removal Using Graphene Oxide/Eggshell Adsorbent Norhusna Mohamad Nor; Nur Hidayahtul Nazrah Kamil; Amirul Izan Mansor; Hawaiah Imam Maarof
Indonesian Journal of Chemistry Vol 20, No 3 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (15.944 KB) | DOI: 10.22146/ijc.43481

Abstract

Graphene oxide with eggshells (GO/ES) adsorbent has been studied for fluoride ions (F–) removal. An adsorption study was conducted in batch experiments at different adsorption parameters, which are initial F– concentration, contact time, and temperature. The effects of these adsorption parameters towards F– removal by using GO/ES adsorbent were investigated. The adsorption parameters were then analyzed with adsorption isotherms (Langmuir and Freundlich), kinetics (pseudo-first-order and second-order) and thermodynamic studies. Under various parameters, GO/ES is proven as an effective adsorbent with an adsorption capacity of F– are up to 48 mg/g. The experimental data were satisfactorily fitted with Langmuir isotherm, which illustrated the monolayer pattern of F– adsorption into GO/ES adsorbent. The adsorption kinetic analysis indicated that the adsorption data could be well described by Pseudo-second-order kinetic model, which indicated the chemisorption process, while thermodynamic studies revealed that the adsorption of F– was an exothermic process.
Co-Authors Amirul Izan Mansor Nor Aida Zubir Norhaslinda Nasuha Norhusna Mohamad Nor Nur Alwani Ali Bashah Nur Azza Azyan Muin Nur Hidayahtul Nazrah Kamil Rasyidah Alrozi