Figure 1 - uploaded by Edip Bayram
Content may be subject to copyright.
Source publication
Z E T S u arıtma sistemleri, artan insan nüfusu ve çevre kirliliği sonucunda oldukça önemli hale gelmiştir. Bu çalışmada, benzoik asit (BA) ve nikotinik asitin (NA) sulu çözeltilerinden, aktiflenmiş karbon elektrotlar (ACEs) üzerine elektrosorpsiyon yolu ile uzaklaştırılmaları incelenmiştir. ACEs, endüstriyel olarak elde edilebilen granüllü aktifle...
Contexts in source publication
Citations
... In addition to operating charge/discharge cycles in batch mode, EOC has also been explored for continuous operation [25,28,61,79,[85][86][87][88][89][90]97,99,[118][119][120][121]. Flow-through and flow-by plate ...
... For example, a decrease in the MB electrosorption onto AC was reported with increased flow rates from 3 to 9 mL min − 1 (Nainamalai et al., 2018). Similar trends have been observed with 2,4-dichlorophenoxyacetic acid (Fig. 8f) (Bayram et al., 2018), acilan blau dye (Koparal et al., 2002), burdem orange II (Gerçel, 2016), BA and NA (Bayram, 2016), metribuzin (Kitous et al., 2009) and BA (Bayram and Ayranci, 2012b) electrosorptions. It was assumed that the EDL thickness at the polarized adsorbent surface decreased with an increasing flow regime (Bayram et al., 2018). ...
Despite being an old process from the end of the 19th century, electrosorption has attracted renewed attention in recent years because of its unique properties and advantages compared to other separation technologies and due to the concomitant development of new porous electrode materials. Electrosorption offer the advantage to separate the pollutants from wastewater with the possibility of selectively adsorbing and desorbing the targeted compounds. A comprehensive review of electrosorption is provided with particular attention given to the electrosorption of organic compounds, unlike existing capacitive deionization review papers that only focus on inorganic salts. The background and principle of electrosorption are first presented, while the influence of the main parameters (e.g., electrode materials, electrode potential, physico-chemistry of the electrolyte solutions, type of compounds, co-sorption effect, reactor design, etc.) is then detailed and the modeling and engineering aspects are discussed. Finally, the main output and future prospects about recovery studies and combination between electro-sorption/desorption and degradation processes are given.
This review particularly highlights that carbon-based materials have been mostly employed (85% of studies) as porous electrode in organics electrosorption, while existing studies lack of electrode stability and durability tests in real conditions. These electrodes have been implemented in a fixed-bed reactor design most of the time (43% of studies) due to enhanced mass transport. Moreover, the electrode potential is a major criterion: it should be applied in the non-faradaic domain otherwise unwanted reactions can easily occur, especially the corrosion of carbon from 0.21 V/standard hydrogen electrode or the water oxidation/reduction. Furthermore, there is lack of studies performed with actual effluents and without addition of supporting electrolyte, which is crucial for testing the real efficiency of the process. The associated predictive model will be required by considering the matrix effect along with transport phenomena and physico-chemical characteristics of targeted organic compounds.
... Penurunan kadar COD limbah yang terendah terjadi pada metode adsorpsi dalam waktu 24 jam yaitu sebesar 31,44%, sedangkan penurunan kadar COD limbah yang tertinggi terjadi pada metode elektro-adsorpsi pada waktu 24 jam yaitu sebesar 43,20%. Bayram (2016) dalam penelitiannya mengenai pemurnian air dengan metode elektrolisis-adsorpsi asam organik aromatik dalam larutan aqueous ke elektroda menggunakan butiran karbon aktif. Variasi laju alir yang digunakan sebesar 20, 60, dan 80 mL/menit dan variasi tegangan sebesar 0,5; 1,5; dan 2,0 V. Tegangan paling optimum terjadi pada kondisi tegangan 1,5 V dengan laju alir volumetrik sebesar 60 mL/menit dengan nilai persentase penghilangan asam benzoat dan asam nikotinat masing-masing 88,1% dan 89,4%. ...
Larutan berminyak yang dihasilkan pengilangan 0,4-1,6 kali jumlah produksi minyak, dengan kadar minyak dan chemical oxygen demand (COD) masing-masing 100-300 mg/L dan 850-1020 mg/L. Komponen minyak dalam limbah dapat menghambat ekosistem perairan, mulai dari pertumbuhannya, fisiologi, dan reproduksi. Elektro-adsorpsi merupakan teknologi pemisahan hybrid untuk pemurnian dan desalinasi air dengan mengkombinasikan metode elektrolisis dan adsorpsi. Penelitian ini bertujuan untuk mengkarakterisasi karbon aktif sebelum dan sesudah proses elektro-adsorpsi dan untuk mengetahui pengaruh tegangan pada pengolahan larutan berminyak ditinjau dari nilai COD dan konsentrasi minyak-lemak. Karakteristik karbon aktif dilihat melalui scanning electron microscope (SEM) dan fourier transform infra red (FTIR). Elektro-adsorpsi dilakukan menggunakan adsorben karbon aktif komersial dan elektroda aluminium, dengan memvariasikan tegangan (0, 5, 10, 15 V) dan waktu (5, 10, 15, 20, 25 menit). Larutan berminyak sintetik dibuat dengan mencampurkan 1 g biosolar (B30) dengan 1 liter air Sungai Musi. Hasil penelitian menunjukkan bahwa metode elektro-adsorpsi efektif digunakan pada pengolahan larutan berminyak sintetik. Hasil analisa SEM karbon aktif sebelum dan sesudah proses elektrolisis adsorpsi menunjukkan distribusi pori-pori tidak beraturan dan banyak pengotor di sekitar pori-pori karbon aktif. Diamater pori-pori rata-rata setelah proses elektrolisis adsorpsi sebesar 2,54 µm dari 2,58 µm. Hasil Analisa FTIR karbon aktif setelah proses menunjukkan terbentuknya puncak gelombang yang menandakan adanya gugus fungsi yang menjadi karakteristik dari biosolar yang teradsorpsi ke dalam karbon aktif. Penurunan kadar COD dan konsentrasi minyak-lemak paling tinggi masing-masing 40,21% pada 5 V selama 5 menit dan 95,25% pada 15 V selama 10 menit.
Electrosorption which can be defined as adsorption onto the surfaces of charged electrodes, has been developing as an efficient and environmentally friendly technology for removing toxic pollutants from aqueous solutions. In this study, an industrial process was used for fabrication of activated carbon electrodes (ACEs). An electroless metal deposition method was used for the modification of AC granules with Ag for antibacterial activity of electrodes. The antibacterial activity of Ag modified activated carbon electrodes (Ag-ACEs) for E.coli bacteria commonly found in water was tested. Adsorption and electrosorption behaviors of E.coli aqueous solutions, onto ACEs and Ag-ACEs were examined in a cyclic electrosorption system. It has been concluded that the performance of Ag-ACEs is better than ACEs as an electrode for electrosorption of E.coli. Moreover polarization can significantly enhance the removal efficiency of E.coli on both ACEs and Ag-ACEs. Finally, electrosorption capacity of the system for E.coli was determined.
An investigation was carried out in this work to assess the potential of graphene as an Electrode in the removal of hardness. The synthesis of graphene was obtained from pencil graphite by using the modified hummers method. Three sets of experimental studies were carried out to achieve the aim of this work. The first set of studies was carried out to assess the potential of Graphene Oxide (GO), Reduced Graphene Oxide (rGO), and graphene as an electrode material to reduce the concentration of hardness. The second set of studies was carried out to investigate the efficiency of different proportions of Poly Ethylene (PE) and Polyvinyl Pyrrolidone (PVP) binders to reduce the concentration of hardness. The last set of experimental studies was carried out to identify the parameters like Contact time, pH and initial concentration of hardness affecting the performance of the selected electrode material with the selected proportions of binder. The Graphene was found to have high removal efficiency of hardness due to its high specific surface area rather than GO and rGO. The PVP binder has high removal efficiency than PE binder. The maximum reduction of 87.75% hardness may be obtained when the contact time is kept as 30 min, pH in neutral condition and the electrolyte concentration as 400 mg/L.
