Performance efficiency of electro-coagulation coupled electro-flotation process (EC-EF) versus adsorption process in doxycycline removal from aqueous solutions

Abstract

Two treatment methodologies such as electro-coagulation coupled electro-flotation (EC -EF) and adsorption have been adopted to remove doxycycline hyclate (DCH) from the aqueous solution. An electro-coagulation (EC) coupled electro-flotation (EF) system has been designed in a closed reactor with a capacity of 1.5L on a laboratory scale. Electro-synthesis of alumina (electro-generated alumina, EGA) using aluminium electrodes with magnesium chloride as an electrolyte was achieved and used for the adsorption experiments. In both the treatment techniques, removal of DCH efficiency as a function of pH, initial DCH concentration and interfering electrolyte was studied. About 99% of DCH was removed at the end of 80 minutes in the range of pH 6 -8 by EC -EF process whereas the adsorption technique achieved about 73% (73 mg g -1 ) of DCH removal in the pH range of 3 -9 at the equilibrium time of 150 minutes.Current density of 5.39 mS cm -2 and EGA dose of 4 g L -1 was optimized respectively for the EC -EF and adsorption processes. The presence of accompanying electrolyte (NaCl) with DCH solution in the EC -EF process increased the electrical conductivity of 1.78 mS cm -1 and could achieve about 90% of DCH removal in the first 30 minutes. On the other hand, in the adsorption process, the participation of chloride (NaCl) as an interfering ion decreased the DCH removal to about 76%. Kinetic and isotherm models fitting the DCH removal dynamics in both the techniques have been checked for their validation. Characterization studies which include FTIR, SEM and XRD have also been done to explore the functional groups, surface morphology and crystalline nature of the solid materials.

Effective degradation of doxycycline by photocatalytic BiVO4–H2O2 under visible light

“…Furthermore, BiVO 4 particles can be recycled with better results for four times. By reviewing some existing studies, the proposed photocatalytic BiVO 4 –H 2 O 2 method has the character of low cost, environmental friendliness, and wide application. In addition, these works provide many references for improving water quality and reducing water pollution.…”

“…14 Due to the presence and the risks of DOX in some water bodies, it is important to remove DOX from water. The existing methods mainly include electrocoagulation, 15 adsorption, [16][17][18] biodegradation, 19 fenton, 20 and photodegradation technique. 10 Photodegradation technique is an effective, economical, and environmentally friendly technique.…”

Su Ve Atiksu Aritminda Elektroflotasyon Prosesi̇

“…Elektrot olarak çözünen bir metal kullanıldığında demir ve alüminyum gibi suda metal hidroksit flokları oluşabilir. Bu da kirleticilerin gideriminde oldukça yararlı olan Me(OH)3 floklarıdır [4,5,6].…”

“…İnert elektrotlar oksijen oluştururken, aktif elektrotlar ise elektroliz ile çözünürler ve bu elektrotların oksijen kabarcıkları oluşturma potansiyelleri düşüktür [4,5]. Metal, karbon, grafit malzemeler ve metallerin oksitleri gibi iletken metal bileşikleri ve yarı iletkenler ile metaller içerisinde platin ve altın, hem bazik hem de asidik çözeltilere uygulanabilir özelliklere sahiptir [6,7]. Platin, titanyum, platin-iridyum, titanyum-taltanyum, titanyumkalayoksit vb.…”

Electrocoagulation coupled adsorption for anaerobic wastewater post-treatment and reuse purposes

“…The electrolytic system was composed of a reactor with a useful volume of 2 L (ø = 165 mm and h = 190 mm) where 1.4 L of wastewater was added in each experiment. The rectangular electrodes, a carbon steel cathode and an aluminum anode (with a projected area of 49.89 cm 2 ), were arranged vertically and distally at 10 mm, according to the values reported in the literature [17,31,32]. The electrodes were supplied by electric current under galvanostatic conditions (continuous and constant current intensity) by an electrical source (New Dawer, FCC5002D).…”