The peroxynitrite (PMS) was further combined with above electrodes to construct an electrocatalytic oxidation (EC) system for the removing of doxycycline hydrochloride from wastewater. Based on the findings, the MnO2/CuO-mesoporous silica (SBA)-15 electrode displayed a long lifetime and excellent catalytic performance.
Moreover, electrochemical tests, including cyclic voltammetry (CV) curves, linear sweep voltammetry (LSV) curves, as well as alternating-current (AC) electrochemical impedance spectroscopy (EIS), were applied to study the electrocatalytic ability of the electrode for the degradation of doxycycline hydrochloride in simulated wastewater. The corrosion resistance of the coated electrodes was evaluated by characterizing the microscopic morphology of the electrodes using scanning electron microscopy (SEM).
ADVENTUREQUEST 3D PUMPKIN SEEDS SERIES
To effectively degrade antibiotics, a series of MnO2 modified electrodes were prepared by using a thermal decomposition method in this study. The adsorption included mainly hydrogen bond and π–π conjugation interactions, and electrostatic interaction. The adsorption capacity for CHL onto CHAC-3 was much higher than those of reported low-cost adsorbents. Those results revealed that the adsorption process was heterogeneous adsorption by main chemisorption. The adsorption isotherm was carried on and it was found that CHL adsorption onto CFAC best fitted to Freundlich and Temkin model. In addition, it was found that the CHL adsorption onto CFAC-n was well suitable for fitting with pseudo-second-order kinetic model and Elovich kinetics model. The adsorption conditions (adsorbent dosage, antibiotic initial concentration, adsorption temperature and pH value) of CFAC-3 showed to be directly related to the adsorption effect.
CFAC-3 possessed the largest specific surface area (1755 m² g⁻¹) and the best adsorption amount (523.0 mg g⁻¹). According to the results, the adsorption capacity onto CFAC-n was positively correlated to the specific surface area. The adsorption kinetics of CFAC-n for CHL removal were investigated and the kinetic parameters were also calculated. The pore diameter, pore volume, specific surface area and surface functional groups of CFAC-n were determined by several characterizations such as BET, XRD, Raman, TEM, FTIR and XPS.
ADVENTUREQUEST 3D PUMPKIN SEEDS ACTIVATOR
Good regeneration capability and high adsorption capacity of PSSAC represents its excellent potential to alleviate emerging contaminants from wastewater.Ī series of activated carbon (CFAC-n, n = 1,2,3,4) adsorbents of higher adsorption capacity were synthesized through coconut fiber carbon (CFAC-0) and KOH activator (CFAC-0:KOH = 1:1, 1:2, 1:3, 1:4), respectively, by the heating method for chloramphenicol (CHL) adsorption. The maximum identified adsorption capacity value was 23.6 mg/g at 318 K. Moreover, the investigation about adsorption mechanisms resulted that H-bonding and π−π electron-donor–acceptor (EDA) interactions heavily affected DOX adsorption over PSSAC.
The calculated thermodynamic parameters (ΔHO, ΔSO and ΔGO) represented that the adsorption of DOX onto PSSAC was endothermic, instinctive and practicable in the temperature extent of 288–318 K.
The kinetic and isotherm studies reveal that the adsorption process is performed via pseudo-second-order reaction and multilayer adsorption. The effect of relevant process parameters like solution pH, PSSAC dose, contact time and temperature were assessed to get the optimum experimental conditions. Surface area and pore size distribution were evaluated with the help of BET and BJH characterization techniques respectively. Prepared PSSAC was characterized to determine its chemical and morphological characteristics employing FTIR, XRD, FESEM and zeta potential. The adsorptive performance of PSSAC was quantified for decontamination of water from a doxycycline hydrochloride (DOX) antibiotic. In the present study, pumpkin seed shell activated carbon (PSSAC) was efficiently synthesized via microwave-assisted pyrolysis technique, employing pumpkin seed shell as the precursor and H3PO4 activator.
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