Sol–gel Synthesis of Kaolin/TiO2 Nanocomposites for Photocatalytic Degradation of Tannery Wastewater

Mustapha, S.; Tijani, Jimoh Oladejo; Egbosiuba, Titus Chinedu; Sumaila, A.; Amigun, T. A.; Salihu, A. B.; Ibrahim, Y. O.; Ndamitso, M. M.; Abdulkareem, Saka Ambali

doi:10.1007/978-3-030-98202-7_13

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…In this context, nanocomposites based on kaolinite with metals and metal oxides (Ag, TiO 2 and ZnO) have been fabricated mainly by using sol–gel and chemical reduction methods which are considered non‐ecofriendly and high costly. In addition, the structural binding between metals and kaolinite in such products is inefficient because of their low physicochemical stability, especially under acidic conditions, that leading to significant metal dissociation rate and hence toxicity through their uses as photocatalysts in acidic waste water treatment 24,25 . Therefore, in the present study, a novel high efficient and physicochemically stable titanium dioxide quantum dots‐kaolinite (TiO 2 ‐QDs‐Kao) nanocomposite was designed and prepared by a rapid, low‐cost and green pyrofabrication method using a commercial titanium tetraisopropoxide (TTIP) and a representative purified kaolinite sample collected from an economic Egyptian kaolin deposit.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the structural binding between metals and kaolinite in such products is inefficient because of their low physicochemical stability, especially under acidic conditions, that leading to significant metal dissociation rate and hence toxicity through their uses as photocatalysts in acidic waste water treatment. 24,25 Therefore, in the present study, a novel high efficient and physicochemically stable titanium dioxide quantum dots-kaolinite (TiO 2 -QDs-Kao) nanocomposite was designed and prepared by a rapid, lowcost and green pyrofabrication method using a commercial titanium tetraisopropoxide (TTIP) and a representative purified kaolinite sample collected from an economic Egyptian kaolin deposit. The produced nanocomposite material was fully characterized and tested for functionality in sunlight photocatalytic degradation of Rhodamine B dye.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of Rhodamine B dye using low‐cost pyrofabricated titanium dioxide quantum dots‐kaolinite nanocomposite

Awad

Farrag

El-Bindary

et al. 2023

Applied Organom Chemis

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In this study, we report a simple technique for the pyrofabrication of a novel photocatalyst of titanium dioxide quantum dots-kaolinite nanocomposite (TiO 2 -QDs-Kao) used for rhodamine B (RhB) dye degradation. The photocatalyst was characterized by using different analytical techniques, including XRD, XRF, XPS, FTIR, DTA/TGA, SEM-EDX, TEM, BET, BJH, ZP and UV-Vis DRS. The photocatalytic degradation of RhB was performed in aqueous solutions using the sustainable sunlight energy under atmospheric conditions and fixed neutral medium (pH = 7). The produced photocatalyst exhibited optical band gap energy of 2.85 eV, an improved large specific surface area of 107.724 m 2 /g with pore radius of 1.45 nm and total pore volume of 0.123 cm 3 /g.The study indicated a maximum 91% degradation efficiency of RhB after 120 min using the optimum dose 1,400 mg/l of the TiO 2 -QDs-Kao photocatalyst. The degradation of RhB dye fitted the Langmuir first-order kinetics with rate constant 0.0151 min À1 . The radical trapping experiments based on scavengers confirmed that the mechanism of photocatalytic degradation activity was potentially based on electron (e À ) and hole (h + ) conduction band. The potential energy of the valence and conduction bands E VB and E CB were calculated 2.73 and À0.12 eV, respectively. A triple reusability study confirmed a high stability of TiO 2 -QDs-Kao photocatalyst with detected degradation efficiencies of 91.0, 89.9, 88.8 and 87.5%, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of Rhodamine B dye using low‐cost pyrofabricated titanium dioxide quantum dots‐kaolinite nanocomposite

Awad

Farrag

El-Bindary

et al. 2023

Applied Organom Chemis

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“…Kaolin, one of the common clay minerals, has been studied as a nanoparticle support due to its low cost, abundance, and eco-friendliness. ,− In particular, its exceptional properties, such as high versatility and thermal and mechanical stability, make it essential to act as a nanocatalyst support. , Kaolin is a phyllosilicate material and presents a nanolayered structure. The layers composing kaolinite’s primary particles are stacked together by van der Waals and electrostatic forces.…”

Section: Introductionmentioning

confidence: 99%

Kaolin-Supported Silver Nanoparticles as an Effective Catalyst for the Removal of Methylene Blue Dye from Aqueous Solutions

et al. 2022

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Water contamination by organic dyes has become a reason for severe environmental pollution and has been threatening the aquatic ecosystem. In this study, kaolin-supported silver nanoparticle (Ag-NP) composites were synthesized by a facile two-step adsorption−reduction method through the reduction of silver ions adsorbed onto locally available, inexpensive, and easily pretreated kaolin surfaces by using sodium borohydride (NaBH 4 ) for the catalytic degradation of methylene blue (MB) dye in aqueous solution. The morphology, structure, surface area, and interaction of the synthesized materials were investigated by scanning electron microscopy, X-ray diffraction, Brunauer− Emmett−Teller, and Fourier transform infrared spectroscopy, respectively. Characterization results showed the successful growth of Ag-NPs on the kaolin surface. To understand the catalytic degradation performance of the catalyst, batch experiments were carried out using MB dye as a model dye. The catalytic reduction tests confirmed the importance of Ag-NPs and the high catalytic activities of the synthesized Ag-NPs/kaolin composite toward MB dye reduction. The degradation results indicated that the increased Ag-NP content on the kaolin surface through repeating cycles could effectively enhance the removal of MB dye from an aqueous solution. The kinetic analysis of the MB dye degradation of the catalyst has fitted the pseudo-first-order kinetic model. More than 97% removal efficiency was still present after five reuse cycles, demonstrating exceptional stability and reusability of the composite. In conclusion, the Ag-NPs supported kaolin (Ag-NPs/kaolin) composite was found to be a promising catalyst for the excellent catalytic activity to reduce a model dye MB from the aqueous solution in the presence of NaBH 4 with catalytic efficiency higher than 97% and a reduction rate constant, k red , higher than 0.86 min −1 .

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Green Nanomaterials: Processing, Characterization and Applications

Tadesse

Lübben

2023

Smart Nanomaterials Technology

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Sol–gel Synthesis of Kaolin/TiO2 Nanocomposites for Photocatalytic Degradation of Tannery Wastewater

Cited by 8 publications

References 27 publications

Photocatalytic degradation of Rhodamine B dye using low‐cost pyrofabricated titanium dioxide quantum dots‐kaolinite nanocomposite

Photocatalytic degradation of Rhodamine B dye using low‐cost pyrofabricated titanium dioxide quantum dots‐kaolinite nanocomposite

Kaolin-Supported Silver Nanoparticles as an Effective Catalyst for the Removal of Methylene Blue Dye from Aqueous Solutions

Green Nanomaterials: Processing, Characterization and Applications

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