Removal of rhodamine 6G from synthetic effluents using Clitoria fairchildiana pods as low-cost biosorbent

Silva, Andreza Miranda Barata da; Serrão, Naiany Oliveira; Celestino, Gustavo de Gusmão; Takeno, Mitsuo Lopes; Antunes, Nicanor Tiago Bueno; Iglauer, Stefan; Manzato, Lizandro; Freitas, Flávio A. de; Maia, Paulo José Sousa

doi:10.1007/s11356-019-07114-6

Cited by 18 publications

(7 citation statements)

References 39 publications

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“…47,52 Consequently, the obtained absolute value of ΔH° was in the range of 17-20 kJ mol −1 , indicating the adsorption process to be physical in nature. 16,53 This result was in good agreement with those obtained by the value of E calculated from the R-D model (Table 4). Besides, the negative ΔS° value indicated the increase in the molecular organisation and the decrease in randomness at the solid-solution interface during the adsorption process.…”

Section: Thermodynamic Studysupporting

confidence: 87%

Adsorption of Rhodamine 6G Dye onto Al-MCM-41 and MCM-41 Mesoporous Materials

Douba

Mohammedi

Cheknane

2022

Kemija U Industriji

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The present study aimed to evaluate the potential of mesoporous silica MCM-41 and Al-MCM-41 (molar ratio Si/Al = 20) for the removal of Rhodamine 6G (Rh6G) from aqueous solution. The adsorbents were characterised by XRD, FTIR, SEM-EDX, BET, and UV-Raman. Obtained results related to XRD analysis indicated that the MCM-41 structure remained intact after the incorporation of Al species. Kinetic adsorption study showed that the higher removal (88.75 %, 26.62 mg g −1 ) of Rh6G dye was achieved by Al-MCM-41 at 60 min. FTIR analysis showed that hydrogen bonding played the dominant role in the Rh6G removal mechanism, while the pH results showed that electrostatic interaction was also a key factor. This study shows that the prepared mesoporous materials are inexpensive and efficient adsorbents for the removal of cationic dyes.

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Section: Thermodynamic Studysupporting

confidence: 87%

Adsorption of Rhodamine 6G Dye onto Al-MCM-41 and MCM-41 Mesoporous Materials

Douba

Mohammedi

Cheknane

2022

Kemija U Industriji

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“…1b-f). Rhodamine 6 G (Rh6G) solution was used as a representative organic dye pollutant, which is highly corrosive and may have serious ecological effects on the aquatic environment 37,38 . When the Rh6G is degraded with a photocatalytic reaction, it is mineralized to carbon dioxide (CO 2 ) and water (H 2 O), which are less toxic organic by-products that are environmentally benign.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical optofluidic microreactor for water purification using an array of TiO2 nanostructures

et al. 2022

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Clean water for human consumption is, in many places, a scarce resource, and efficient schemes to purify water are in great demand. Here, we describe a method to dramatically increase the efficiency of a photocatalytic water purification microreactor. Our hierarchical optofluidic microreactor combines the advantages of a nanostructured photocatalyst with light harvesting by base substrates, together with a herringbone micromixer for the enhanced transport of reactants. The herringbone micromixer further improves the reaction efficiency of the nanostructured photocatalyst by generating counter-rotating vortices along the flow direction. In addition, the use of metal-based substrates underneath the nanostructured catalyst increases the purification capacity by improving the light-harvesting efficiency. The photocatalyst is grown from TiO2 as a nanohelix film, which exhibits a large surface-to-volume ratio and a reactive microstructure. We show that the hierarchical structuring with micro- to nanoscale features results in a device with markedly increased photocatalytic activity as compared with a solid unstructured catalyst surface. This is evidenced by the successful degradation of persistent aqueous contaminants, sulfamethoxazole, and polystyrene microplastics. The design can potentially be implemented with solar photocatalysts in flow-through water purification systems.

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“…Rhodamine 6G is an azo dye with one or more -N=N-groups attached to an aromatic structure. The dye is chemically stable and recalcitrant because of its chromophoric characteristics (Miranda et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Several approaches that involve the use of adsorbents have been proposed to overcome this problem. For example, Clitoria fairchildiana pods can adsorb up to 73.84 mg g −1 of Rhodamine 6G dye through chemisorption, but its application is time consuming (Miranda et al, 2019). Ni-Al-layered double oxides can remove dyes with 16% removal efficiency (Intachai et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Rhodamine 6g Removal from Aqueous Solution with Coconut Shell-Derived Nanomagnetic Adsorbent Composite (Cs-Nmac): Isotherm and Kinetic Studies

Abdullah¹,

Wen²,

Awang³

et al. 2021

JST

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Untreated effluents from the textile industry containing colorant dyes are harmful to the environment, aquatic organisms, and human health. Among these effluents, Rhodamine 6G is known as a corrosive and irritant dye. A coconut shell-derived nanomagnetic adsorbent composite (CS-NMAC) was developed to remove Rhodamine 6G from aqueous solution. Physical and adsorption properties of CS-NMAC were characterized via Brunauer–Emmett–Teller (BET) surface area analysis (SBET: 1092.17 m2/g; total pore volume: 0.6715 cm3/g), X-ray diffraction (Fe3O4 [θ=35.522], Fe2O3 [θ=35.720] and FeO [θ=41.724]) and Fourier transform infrared spectroscopy (Fe–O, C–H, asymmetric C=C=C, CN and O–H). CS-NMAC was found to be electropositive within a broad pH range of 3–10) owing to the presence of nanoscale iron oxides on the surface of the coconut shell-derived adsorbent that enhanced the chemical and electrochemical outputs. Isotherm study revealed that the adsorption process of Rhodamine 6G followed a multilayer type of adsorption onto a heterogeneous surface. Freundlich model fitted better (R2 = 0.981) than the other models (Langmuir, Temkin and BET). The maximum adsorption capacity was 32.02 mg/g. Rhodamine 6G removal by CS-NMAC obeyed the pseudo-second-order reaction (R2 = 0.9995) as opposed to other kinetic models. CS-NMAC has the potential to become an effective treatment for dye pollution.

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Removal of rhodamine 6G from synthetic effluents using Clitoria fairchildiana pods as low-cost biosorbent

Cited by 18 publications

References 39 publications

Adsorption of Rhodamine 6G Dye onto Al-MCM-41 and MCM-41 Mesoporous Materials

Adsorption of Rhodamine 6G Dye onto Al-MCM-41 and MCM-41 Mesoporous Materials

Hierarchical optofluidic microreactor for water purification using an array of TiO2 nanostructures

Rhodamine 6g Removal from Aqueous Solution with Coconut Shell-Derived Nanomagnetic Adsorbent Composite (Cs-Nmac): Isotherm and Kinetic Studies

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