Optimisation of mercury adsorption by ZIF-8 from aqueous solutions through response surface methodology

International Journal of Environmental & Analytical Chemistry, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 23

Published: Nov. 25, 2024

Mercury is one of the most toxic heavy metals. Various techniques have been used to remove it from water sources. Among these, adsorption a low-cost and effective method mercury even in very low concentrations. One adsorbents that has gained considerable popularity recently zeolite imidazolate framework-8 (ZIF-8). In this study, after synthesis ZIF-8, its properties were determined using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission electron microscopy (FESEM). Temperature (25–61 °C), contact time (5–85 min), adsorbent dosage (0.1–0.9 g/L), pH (2–10), initial concentration (24- mg/L) investigated. The optimal conditions for response surface methodology (RSM). elimination included primary 4 mg/L, temperature 61°C, dose (0.5 7; efficiency under these was 91.66%. equilibrium data analysed Langmuir Freundlich isotherm models, model found be consistent with (R2 = 0.9363). kinetics closely matched pseudo-second-order 0.9998). These results indicate nanoporous ZIF-8 can successfully eliminate aqueous environments.

Language: Английский

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Investigating the photocatalytic removal of amoxicillin from aqueous solutions by Fe-TiO ₂ @Fe ₃ O ₄ magnetic nanoparticles. Characteristics/effect of parameters/kinetic study

Chemical Engineering Communications, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 17

Published: Jan. 6, 2025

In the present work, sol-gel and co-precipitation techniques were used for synthesis of Fe-TiO2@Fe3O4 nanoparticles (NPs) Fe3O4, respectively. These photocatalytic removal amoxicillin. characteristics analyzed via Energy Dispersive X-ray Spectroscopy) EDX(, field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy) FT-IR(, Vibrating Sample Magnetometer) VSM(, diffraction) XRD(, Brunauer Emmett Teller (BET), Diffuse reflectance spectroscopy (DRS). The effect different parameters, like pH (11-3), number NPs (100–200 mg), amoxicillin primary concentration (40–80 mg/L), on elimination by OFAT method (one factor at a time) diverse times (0–75 min), was studied. mean size Fe-TiO2 Fe3O4 is 15.05 18.12 nm, incorporation iron into titanium dioxide acts as an intermediate energy level, reducing band gap shifting light absorption to visible range. Chemical bonding stretching vibrations related hydroxyl group (structural water OH group) observed in FT-IR results. optimum results maximum effectiveness reaction rate constant achieved 7. weight 600 mg 40 mg/L 75 min time. decreased from 99.9% 89% after five recycling steps.

Language: Английский

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Electro-Fenton process optimization for reactive black 5 dye degradation using cesium phosphomolybdate as a cathode electrocatalyst

Journal of Water Process Engineering, Journal Year: 2025, Volume and Issue: 72, P. 107616 - 107616

Published: April 1, 2025

Language: Английский

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Optimizing a Quad-Oxidant Hybrid Process with Hydrodynamic Cavitation and UV Radiation for Allura Red Degradation

Water Resources and Industry, Journal Year: 2025, Volume and Issue: unknown, P. 100287 - 100287

Published: April 1, 2025

Language: Английский

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Photocatalytic degradation of reactive black 5 from synthetic and real wastewater under visible light with TiO2 coated PET photocatalysts

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: April 24, 2025

The photocatalytic removal of Reactive Black 5 (RB5) was investigated using a titanium dioxide-polyethylene terephthalate (TiO2-PET) catalyst under visible (VIS) light. sol-gel method employed for the fabrication TiO2-coated PET catalyst, which then characterized X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy-dispersive (EDX), and elemental mapping (MAP) analysis. This study examined reaction kinetics one-factor-at-a-time (OFAT) approach evaluates effects various parameters, including pH (3-11), dosage (0.1-1 g L- 1), contact time (15-120 min), RB5 concentration (10-50 mg hydrogen peroxide (H2O2) content (2-100 mM), purging gases, organic compound types, ionic strength, on RB5. Under optimal conditions (pH= 3, [RB5]°= 20 1, nanocatalyst dosage= 0.5 99.99% dye removed after 120 min. Increasing 1) resulted in decrease observed rate constant (kobs) from 0.052 to 0.0017 min- while calculated electrical energy per order (EEO) increased 11.08 338.82 kWh m- 3. Furthermore, total operating cost light emitting diode (LED)/TiO2-PET process (3 USD kg- lower than that other processes, LED/TiO2 (4.73 LED/PET (40 LED (63.16 1). negatively affected by presence H2O2, O2 N2 compounds, species. Radical quenching experiments confirmed hydroxyl radicals (·OH) were dominant reactive species responsible degradation. efficiency LED/TiO2-PET (99.99%) significantly higher (63.42%). Desorption demonstrated excellent stability, maintaining catalytic activity up five sequential cycles. GC-MS analysis identified several intermediate degradation products, 1,2-benzenedicarboxylic acid, benzoic acid (2-amino-, methyl ester), benzene [(methylsulfonyl) methyl], phenol, 4-naphthalenedione, acetic propionic acid. Moreover, drinking water samples approximately 63.31%, whereas real textile wastewater samples, it reached 96.66%. Toxicity tests conducted final treated solutions no toxicity toward Daphnia magna, demonstrating effectiveness degrading both its toxic by-products.

Language: Английский

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Optimization of catalytic ozonation in a flotation cell through neural networks and genetic algorithms: A case study on caffeine degradation

Journal of Industrial and Engineering Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 1, 2024

Language: Английский

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