Bi2O3 immobilized 3D structured clay filters for solar photocatalytic treatment of wastewater from batch to scaleup reactors

Latif, Anira; Memon, Asadullah; Gadhi, Tanveer A.; Bhurt, Imtiaz Ali; Channa, Najeebullah; Mahar, Rasool Bux; Ali, Imran; Chiadò, Alessandro; Bonelli, Barbara

doi:10.1016/j.matchemphys.2021.125297

Cited by 9 publications

(9 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The XRD pattern of the pristine pumice appeared to be a wider peak between 2θ: 10 and 40 • , depicting the amorphous behavior and dominant presence of silicate-based minerals that could have suppressed the crystals peaks of other compounds, i.e., based on aluminum, calcium, sodium, etc. Alike XRD patterns are reported in our previous work with sintered silica and clay filters and by other studies on pumice [40,46,47]. On the contrary, the XRD patterns of the pumice after five CAD cycles show a crystalline behavior with the appearance of slightly sharp peaks of different intensities at 2θ: 11.84, 14.94, 20.96, 23.64, 29.36, 31.96, 33.64, and 45.6 • .…”

Section: Xrd Structural Analysissupporting

confidence: 81%

Insight on the Properties of Pumice Mineral for the Combined Adsorption Distillation of Membrane Reject Water

Qureshi,

Gadhi,

Khokhar

et al. 2023

Minerals

Self Cite

View full text Add to dashboard Cite

The current study evaluated the use of pumice, a volcanic mineral and common sand, in treating reverse osmosis membrane reject water (ROR) using a novel combined adsorption distillation (CAD) method. The CAD method is developed to separate the dissolved solids through adsorption distillation, i.e., leaving the vaporized distillate as freshwater and concentrated brine. The adsorption potential of pumice and sand was investigated at different adsorbent doses, i.e., 2, 5, and 10 g, and consecutive CAD adsorbent backwashing cycles. The improved results were achieved at a 10 g pumice dose. However, its adsorption efficiency declined in longer CAD cycles, i.e., due to the separated deposition of solids. After backwashing, the adsorbed and accumulated salts were slightly removed, and pumice adsorption capacity was maintained for up to 20 cycles of CAD. The properties of the pumice, i.e., before and after five CAD cycles and after backwashing, were characterized with scanning electron microscopic (SEM), elemental disruptive spectroscopy (EDS), and X-ray diffraction (XRD), which revealed that the porous structure of the pumice was completely accumulated with deposits of ionic salts, which were slightly washed away after backwashing, but accumulation remained continued in post-CAD cycles. The explored method revealed a high potential of pumice in water filtration.

show abstract

Section: Xrd Structural Analysissupporting

confidence: 81%

Insight on the Properties of Pumice Mineral for the Combined Adsorption Distillation of Membrane Reject Water

Qureshi,

Gadhi,

Khokhar

et al. 2023

Minerals

Self Cite

View full text Add to dashboard Cite

show abstract

“…The amount of light intensity within the reactor usually influences the total pollutant transformation and destruction efficiency (Abidi et al 2022;Li et al 2022d;Mafa et al 2022;Xiong et al 2022). As a result, several studies have examined the relationship between pollutant degradation rate and light intensity for various organic contaminants (Atun et al 2022;Latif et al 2022). While the reaction rate was shown to be square root dependent on the light intensity in some circumstances, the two variables were found to have a linear relationship in others (Aliste et al 2022;Zhang et al 2022).…”

Section: Light Intensity and Wavelengthmentioning

confidence: 99%

Solar photo-oxidation of recalcitrant industrial wastewater: a review

et al. 2022

View full text Add to dashboard Cite

Conventional methods to clean wastewater actually lead to incomplete treatments, calling for advanced technologies to degrade recalcitrant pollutants. Herein we review solar photo-oxidation to degrade the recalcitrant contaminants in industrial wastewater, with focus on photocatalysts, reactor design and the photo-Fenton process. We discuss limitations due to low visible-light absorption, catalyst collection and reusability, and production of toxic by-products. Photodegradation of refractory organics by solar light is controlled by pH, photocatalyst composition and bandgap, pollutant properties and concentration, irradiation type and intensity, catalyst loading, and the water matrix.

show abstract

“…Bi 2 O 3 has a low band gap (2.3-3.3 eV) [33], and photogenerated electron-hole pairs (e --h + ) are formed in Bi 2 O 3 under the action of incident light, which has been proven to be a potential photocatalyst for the removal of RhB dyes [34][35][36][37]. In the last decade, due to its low toxicity and potentially high-activity photocatalysts, Bi 2 O 3 in a variety of forms, such as nanoparticles [38][39][40], needles [41], nanorods [42][43][44], nanobelts [45,46], thin films [47], and flower-like forms [48][49][50][51], has been synthesized through chemical precipitation [52,53], hydrothermal [54,55], microwave [56], chemical deposition [57], and electrospinning methods [58], and it has been used for the photocatalytic removal of RhB pollutants.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Photocatalytic Performance, Mechanism, and Degradation Pathways of Rhodamine B with Bi2O3 Microrods under Visible-Light Irradiation

Ma,

Tang,

et al. 2024

Materials

View full text Add to dashboard Cite

In the present work, the photodegradation of Rhodamine B with different pH values by using Bi2O3 microrods under visible-light irradiation was studied in terms of the dye degradation efficiency, active species, degradation mechanism, and degradation pathway. X-ray diffractometry, polarized optical microscopy, scanning electron microscopy, fluorescence spectrophotometry, diffuse reflectance spectra, Brunauer–Emmett–Teller, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, UV–visible spectrophotometry, total organic carbon, and liquid chromatography–mass spectroscopy analysis techniques were used to analyze the crystal structure, morphology, surface structures, band gap values, catalytic performance, and mechanistic pathway. The photoluminescence spectra and diffuse reflectance spectrum (the band gap values of the Bi2O3 microrods are 2.79 eV) reveals that the absorption spectrum extended to the visible region, which resulted in a high separation and low recombination rate of electron–hole pairs. The photodegradation results of Bi2O3 clearly indicated that Rhodamine B dye had removal efficiencies of about 97.2%, 90.6%, and 50.2% within 120 min at the pH values of 3.0, 5.0, and 7.0, respectively. In addition, the mineralization of RhB was evaluated by measuring the effect of Bi2O3 on chemical oxygen demand and total organic carbon at the pH value of 3.0. At the same time, quenching experiments were carried out to understand the core reaction species involved in the photodegradation of Rhodamine B solution at different pH values. The results of X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and X-ray diffractometer analysis of pre- and post-Bi2O3 degradation showed that BiOCl was formed on the surface of Bi2O3, and a BiOCl/Bi2O3 heterojunction was formed after acid photocatalytic degradation. Furthermore, the catalytic degradation of active substances and the possible mechanism of the photocatalytic degradation of Rhodamine B over Bi2O3 at different pH values were analyzed based on the results of X-ray diffractometry, radical capture, Fourier-transform infrared spectroscopy, total organic carbon analysis, and X-ray photoelectron spectroscopy. The degradation intermediates of Rhodamine B with the Bi2O3 photocatalyst in visible light were also identified with the assistance of liquid chromatography–mass spectroscopy.

show abstract

Bi2O3 immobilized 3D structured clay filters for solar photocatalytic treatment of wastewater from batch to scaleup reactors

Cited by 9 publications

References 29 publications

Insight on the Properties of Pumice Mineral for the Combined Adsorption Distillation of Membrane Reject Water

Insight on the Properties of Pumice Mineral for the Combined Adsorption Distillation of Membrane Reject Water

Solar photo-oxidation of recalcitrant industrial wastewater: a review

Investigation of the Photocatalytic Performance, Mechanism, and Degradation Pathways of Rhodamine B with Bi2O3 Microrods under Visible-Light Irradiation

Contact Info

Product

Resources

About