Ultrasound-Assisted Catalytic Degradation of Methyl Orange with Fe₃O₄/Polyaniline in Near Neutral Solution

Abstract

An ultrasound-assisted advanced oxidation process (AOP) has been demonstrated for sonocatalytic degradation of methyl orange (MO) with Fe 3 O 4 /polyaniline (Fe 3 O 4 /PANI) microspheres in near neutral solution (pH ~6). The Fe 3 O 4 /PANI microspheres were characterized with XRD, SEM, TEM, FT-IR, XPS, and zeta-potential measurements, and further tested in the role of adsorption and sonocatalytic decolorization of MO in solution. The isotherms and kinetics of MO adsorption with Fe 3 O 4 /PANI follow the Langmuir model and the pseudo-second-order model, respectively. The kinetics of sonocatalytic decolorization of MO with Fe 3 O 4 /PANI conforms to a combinational model involving the pseudo-second-order adsorption model and the pseudo-first-order degradation model, since Fe 3 O 4 /PANI has a high capacity to adsorb MO in solution. The percentage of room-temperature sonocatalytic degradation of MO with Fe 3 O 4 /PANI is about 4.8, 8.8, and 5.7 times of that with Fe 3 O 4 , dedoped Fe 3 O 4 /PANI, and ultrasonication alone, respectively. The eco-friendly Fe 3 O 4 /PANI featured with superparamagnetism and excellent reusability offers a promising sonocatalyst for rapid decolorization and enhanced degradation of azodyes in effluents.

Fe-based metal organic framework/graphene oxide composite as an efficient catalyst for Fenton-like degradation of methyl orange

“…in the rst step. 56,57 The compounds subsequently underwent a further attack by cOH radicals to form smaller molecular compounds including aniline (m/z ¼ 93), benzoquinone (m/z ¼ 108), nitrobenzene (m/ z ¼ 123), p-nitrophenol (m/z ¼ 140), 2,5-dinitrophenol (m/z ¼ 183), acetic acid (m/z ¼ 60), succinic acid (m/z ¼ 118), oxalic acid (m/z ¼ 90) etc. and eventually converted into inorganic ions (e.g.…”

“…NH 4 + , NO 3 À , and SO 4 2À ), carbon dioxide and water. [56][57][58][59] As the degradation pathway of MO in Fenton-like reaction has been extensively investigated in many researches, the possible intermediate products were not qualitatively analyzed in this study. More detailed studies will be required to investigate the degradation pathway in the near future.…”

Decoloración Sonoquímica Sinérgica Del Anaranjado De Metilo Utilizando Triclorometano en Dos Reactores Ultrasónicos

“…Si bien puede clasificarse como un compuesto moderadamente tóxico en caso de una ingestión única DL 50 = 60 mg/kg (oral, ratas) y 101 mg/kg (intraperitoneal, ratones) es un colorante considerado mutagénico de acuerdo con ensayos realizados en células humanas (fibroblastos), en células embrionarias en ratones y en células del riñón en hamsters (Sigma-Aldrich 2004). Por estas razones, el AM es muy utilizado como colorante modelo en estudios de degradación de contaminantes (Marci et al 2003, Zhang et al 2006, Ali y Abdullah 2011, Haji et al 2011, Kodom et al 2012, Urmi et al 2015, Tang 2013, Hakamada et al 2014, Zhao et al 2014, Wang et al 2015, Zyoud et al 2015, Youssef et al 2016, Yuan et al 2016. Nuestro trabajo también lo hace, planteando como objetivo la posibilidad de utilizar el ultrasonido como tratamiento para aguas coloreadas con AM, analizando el efecto del uso de triclorometano sobre la velocidad de decoloración, y utilizando un reactor por lotes y uno continuo.…”

A magnetically recyclable photocatalyst with commendable dye degradation activity at ambient conditions

“…Although it is believed that TiO 2 as one of the most important applied workhorse heterogeneous photocatalyst degrades azo dyes thoroughly with unrivalled efficiency but it cannot absorb sun light and possesses impeded efficiency and restricted in utilization as a visible light photocatalyst due to its wide band gap (e g = 3.2 eV for anatase) 8 . To alleviate this limitation many reports have been appeared and directed reinforcement in the catalytic performance of the photocatalyst under visible light/ambient conditions 9 , 10 . Towards this goal, the developed quantised technologies are still under thriving strategies and limits it’s practical applications.…”