Effect of linear alkylbenzene sulfonate (LAS) on the coagulation of ZnO nanoparticles in aqueous matrix

Guimarães, Dáfnis Barsanulfa; Terán, Francisco Javier Cuba; Cuba, Renata Medici Frayne

doi:10.5004/dwt.2022.28123

Cited by 2 publications

(1 citation statement)

References 38 publications

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“…The addition of surfactants, such as anionic sodium dodecyl sulfate (SDS) and nonionic nonylphenol nonoxylate (NPEO, Tergitol NP-9), into environmental water samples has been found to delay the aggregation and sedimentation of TiO 2 and ZnO nanoparticles. Furthermore, it was observed that the first type of surfactant exhibited poorer performance, resulting in a more substantial reduction compared to the second type [5,10]. Coagulation/flocculation technique is commonly used for the removal of MP from aqueous matrix.…”

Section: Introductionmentioning

confidence: 99%

Effects of Linear Alkylbenzene Sulfonate and Polyoxyethylene Sorbitan Monolaurate Surfactants on Pristine and Aged Microplastic Removal by Electrocoagulation

Teran,

Oliveira,

Cuba

2024

J. Ecol. Eng.

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Various types of pollutants are present in wastewaters, which can combine and form even more toxic components or interfere with the treatments used for purification. Among emerging contaminants are microplastics and surfactants, which coexist in different types of wastewaters. This study aimed to assess the effects of the anionic surfactant linear alkylbenzene sulfonate (LAS) and the nonionic surfactant polyoxyethylene sorbitan monolaurate (Tween 20) on the removal of microplastics from pristine and aged glitter PVC surfaces using electrocoagulation with aluminum electrodes. To avoid interference from other substances, a benchtop reactor operating in batch mode with particles suspended in ultrapure water was developed for the experiments. The analysis methods employed included counting with the aid of a magnifying glass, gravimetry, zeta potential measurements, and scanning electron microscopy. The results revealed that the addition of surfactants led to a reduction in the removal efficiency of plastic microparticles. The lowest removal percentages were observed at a concentration of 100 ppm, and the inclusion of Tween 20 resulted in a decrease of 23% for pristine microplastics and 45% for aged microplastics. In contrast, the addition of LAS led to a decrease of 6% for pristine microplastics and 24% for aged microplastics. Therefore, the decrease in removal efficiency was more pronounced for degraded microplastics in both the Tween 20 and LAS experiments. Comparing the reduction in removal efficiency between the two types of surfactants, it can be observed that the nonionic surfactant (Tween 20) had a greater impact on the removal of microplastics by electrocoagulation.

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Section: Introductionmentioning

confidence: 99%

Effects of Linear Alkylbenzene Sulfonate and Polyoxyethylene Sorbitan Monolaurate Surfactants on Pristine and Aged Microplastic Removal by Electrocoagulation

Teran,

Oliveira,

Cuba

2024

J. Ecol. Eng.

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Study of the Effect of the Surfactant Linear Alkylbenzene Sulfonate (LAS) on the Coagulation of Aged Microplastic

Teran,

Morais,

Costa

et al. 2024

RGSA

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Objective: Evaluate the effect of linear alkylbenzene sulfonate (LAS) surfactant on the coagulation of aged microplastic. Theoretical Framework: Chemical coagulation is one of the steps adopted in water treatment that can help remove microplastics. During coagulation, suspended particles agglomerate, increasing the efficiency of removing these particles in the sedimentation stage. However, when coagulation occurs in the presence of surfactants, evidence points to deficits in removal capacity. Method: Using Jar Test tests, the optimal parameters for microplastic removal were determined with aluminum sulfate as a coagulating agent in the presence and absence of the surfactant linear alkyl benzene sulfonate (LAS). The LAS concentrations studied were in the range of 20 mg/L to 300 mg/L. Microplastic removal efficiency was evaluated by measuring turbidity. Results and Discussions: The combination of pH and coagulant concentration values that best suited the system were 5.0 and 4.25 mg/L, respectively. Due to the addition of surfactants, a decrease in removal efficiency was observed, with an average value ranging from 94.79% to 76.50% due to the interaction of polyethylene spheres with the surfactant. Research Implications: As explained, due to the coexistence of microplastics and surfactants in the aqueous environment, studies that describe chemical coagulation under these conditions have great value for optimizing treatment systems and technologies. Research Originality/Value: The use of aged microplastics aims to approximate their natural occurrence.

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Effect of linear alkylbenzene sulfonate (LAS) on the coagulation of ZnO nanoparticles in aqueous matrix

Cited by 2 publications

References 38 publications

Effects of Linear Alkylbenzene Sulfonate and Polyoxyethylene Sorbitan Monolaurate Surfactants on Pristine and Aged Microplastic Removal by Electrocoagulation

Effects of Linear Alkylbenzene Sulfonate and Polyoxyethylene Sorbitan Monolaurate Surfactants on Pristine and Aged Microplastic Removal by Electrocoagulation

Study of the Effect of the Surfactant Linear Alkylbenzene Sulfonate (LAS) on the Coagulation of Aged Microplastic

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