Preparation of silica nanoparticles from geothermal sludge via sol-gel method

Jenie, S. N. Aisyiyah; Ghaisani, Almira; Ningrum, Yudia P.; Kristiani, Anis; Aulia, Fauzan; Petrus, Himawan Tri Bayu Murti

doi:10.1063/1.5064968

Cited by 19 publications

(21 citation statements)

References 6 publications

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“…The detection platform used in this study is the fluorescent nanoparticles SNP-RB, which is obtained from the modification of geothermal silica precipitate with the fluorescent dye, Rhodamine B. The chemical and physical properties of the silica precursor has been reported in our earlier works [ 23 , 25 ]. We hypothesize that using other silica sources as the precursor will differ in regard to its chemical composition, surface chemistry as well as physical properties.…”

Section: Resultsmentioning

confidence: 99%

“…Silica nanoparticles are one of nanostructure materials used as a building block of biosensor due to its advanced properties such as high surface area, ability to bind biomolecules covalently to the surface, biocompatibility, and biodegradability [ 21 , 22 ]. In this study, the silica precursors for the nanoparticles were obtained from silica scaling of geothermal power plants, as reported in our earlier study [ 23 ]. Rhodamine B, which has been well known as a pink fluorescent dye for detecting bacterial lipases [ 24 ], is applied as the fluorophore.…”

Section: Introductionmentioning

confidence: 99%

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Rapid Fluorescence Quenching Detection of Escherichia coli Using Natural Silica-Based Nanoparticles

Jenie

Kusumastuti

Krismastuti

et al. 2021

Sensors

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The development of fluorescent silica nanoparticles (SNP-RB) from natural amorphous silica and its performance as an Escherichia coli (E. coli) biosensor is described in this paper. SNP-RB was derived from silica recovered from geothermal installation precipitation and modified with the dye, Rhodamine B. The Fourier Infrared (FTIR) confirms the incorporation of Rhodamine B in the silica matrix. Transmission Electron Microscopy (TEM) micrographs show that the SNP-RB had an irregular structure with a particle diameter of about 20–30 nm. The maximum fluorescence spectrum of SNP-RB was recorded at 580 nm, which was further applied to observe the detection performance of the fluorescent nanoparticles towards E. coli. The sensing principle was based on the fluorescence-quenching mechanism of SNP-RB and this provided a wide linear E. coli concentration range of 10–105 CFU/mL with a limit detection of 8 CFU/mL. A rapid response time was observed after only 15 min of incubation of SNP-RB with E. coli. The selectivity of the biosensor was demonstrated and showed that the SNP-RB only gave quenching response only to live E. coli bacteria. The use of SNP-RB as a sensing platform reduced the response time significantly compared to conventional 3-day bacterial assays, as well having excellent analytical performance in terms of sensitivity and selectivity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid Fluorescence Quenching Detection of Escherichia coli Using Natural Silica-Based Nanoparticles

Jenie

Kusumastuti

Krismastuti

et al. 2021

Sensors

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“…Previous research reported the optimum gelling time of the silica was 18 h with concentration of NaOH of 1.5 N [1]. In this research, we investigated the effect of rhodamine B concentration towards the optical properties of the FSNP.…”

Section: Results and Discussion Synthesis And Fluorescent Intensity Of Fsnpmentioning

confidence: 99%

“…Using the geothermal silica to generate silica-based nanomaterial provides a way to solve the waste problem. Silica is a non-toxic and functionable material with the general formula of SiO2 consisting silicon and oxygen [1]. Conventionally, silica was synthesized from either silicate solution or silane reagents [2].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Rhodamine B on The Properties of Fluorescent Nanoparticles Derived from Geothermal Silica

Untoro

Widyasari

Supriadi

et al. 2020

J. Pure App. Chem Res

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Rhodamine B can be used as a fluorophore to produce fluorescent silica nanoparticles derived from geothermal sludge. The purpose of this research is to synthesize fluorescent silica nanoparticles (FSNP) modified with rhodamine B and cetyl trimethyl ammonium bromide (CTAB) using sol-gel method. Geothermal waste was used as a precursor and added with NaOH at 900C to generate sodium silicate. Rhodamine B, as the fluorescent dye were added with concentration variations ranging from 0.156 mg/g to 10 mg/g.CTAB was used as template and HCl 2N was applied as gelling catalyst with aging time of 18 hours. Characterization of FSNP was measured using spectrofluorometer to identify the fluorescent intensity, fourier transform infrared (FT-IR) to determine the functional group of FSNP, Brauner-Emmett-Teller (BET) adsorption to calculate the specific area of the particles, X-ray diffraction (XRD) to analyze the crystallographic phases, and transmission electron microscopy (TEM) to analyze the surface morphology of the FSNP. FT-IR and fluorescent intensity results showed that FSNP with 2.5 mg/g of rhodamine B had the optimum characteristics. The FSNP was in amorphous phase with uniform pore distribution. BET analysis showed that the specific surface of the FSNP was 190.22 m2/g.

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“…Silica is an inorganic material that is abundantly available in nature. The synthesis of silica can be conducted by utilizing geothermal sludge as the precursor using the sol-gel method [1]. Silica generated using the sol-gel method has been initiated since 1968 by Stober, where hydrolysiscondensation reactions of silica oxide or halide gel resulted in a polymer system (silica gel) forming the so-called xerogel [2].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Nanoparticles based on Natural Silica as a Methyl Ester Forming Acid Catalyst

Elmaria

Jenie

2021

J.Kim.Terap.Indones.

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Natural silica has advantages in various fields such as catalysts, because it is easily obtained and applied in the chemical reaction process. The synthesis of natural silica-based magnetic acid catalyst, MSNP/SO42- aims to obtain a large yield from the reaction process between oleic acid and methanol to form methyl ester. Natural silica obtained from geothermal waste was washed with distilled water, then sol gel method was applied at pH of 4-6 to obtain SiO2 nanoparticles. FeCl3 was added to achieve the magnetic properties, and the cetyl trimethyl ammonium bromide (CTAB) is varied in order to attain optimal mesoporous size. Brunauer emmet teller (BET) results showed optimum results from 1: 2 molarity ratio between silica and CTAB with a surface area of 520.94 m2/g. The acidic properties were obtained by immersion using H2SO4 0.5 M. The catalyst were tested for the acidic and magnetic properties using temperature programmed desorption ammonia (TPD-NH3) and vibrating sample magnetometer (VSM) characterization resulting intotal acidity of 0.2488 mmol/g and. softmagnetic type, respectively. The BET surface area of the sulfate modified into MSNP/SO42-, was decreased by 114.44 m2/g. Application of MSNP/SO42- as a catalyst for forming methyl esters obtained a percentage of 85.41% yield based on the gas chromatography mass spectrometry (GC- MS) results.

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Preparation of silica nanoparticles from geothermal sludge via sol-gel method

Cited by 19 publications

References 6 publications

Rapid Fluorescence Quenching Detection of Escherichia coli Using Natural Silica-Based Nanoparticles

Rapid Fluorescence Quenching Detection of Escherichia coli Using Natural Silica-Based Nanoparticles

The Effect of Rhodamine B on The Properties of Fluorescent Nanoparticles Derived from Geothermal Silica

Magnetic Nanoparticles based on Natural Silica as a Methyl Ester Forming Acid Catalyst

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