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Start Over Author "Gusrizal, Gusrizal" Publisher universitas gadjah mada
7 results on '"Gusrizal, Gusrizal"'

1. Microbial Degradation of Lignocellulose in Empty Fruit Bunch at Various Incubation Time

Author

Noverando Rafiel Angelo, Rudiyansyah Rudiyansyah, and Gusrizal Gusrizal

Subjects
cellulose, delignification, empty fruit bunch, incubation time, p. ostreatus, Agriculture (General), S1-972, Plant culture, SB1-1110
Abstract

Isolation of cellulose in empty fruit bunch (EFB) is hindered by lignin content. EFB was pretreated with Pleurotus ostreatus which has the ability to degrade lignin, in various incubation times (0th, 15th,30th, 45th, and 60th). The result showed lignin and cellulose decreased from 29.3% to 20.3% and from 40.2% to 26.2%, respectively. The optimum degradation time was on 30th day in which lignin and cellulose contents decreased from 29.3% to 20.3% and from 41% to 39.7% respectively. The cellulose to lignin (C/L) ratio increased from 1.40 to 1.99. These data revealed that P. ostreatus have a high potential for EFB delignification.

Published
2022
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4. Silver Nanoparticles Capped with p-Hydroxybenzoic Acid as a Colorimetric Sensor for the Determination of Paraquat

Author

Gusrizal Gusrizal, Sri Juari Santosa, Eko Sri Kunarti, Bambang Rusdiarso, Indonesia Ministry of Research, Technology, and Higher Education, Philip Anggo Krisbiantoro, and Rector of Universitas Tanjungpura

Subjects
nanoparticles, paraquat, p-hydroxybenzoic acid, sensor, silver, Chemistry, QD1-999
Abstract

Highly stable silver nanoparticles capped with p-hydroxybenzoic acid were synthesized by reducing silver ion with p-hydroxybenzoic acid and used for the detection of paraquat. The synthesized silver nanoparticles, which are yellow, exhibited an absorption peak at 420 nm when measured with a UV-visible spectrophotometer due to the surface plasmon resonance. In the presence of paraquat, the color of silver nanoparticles changed from yellow to purple accompanied by the appearance of a new peak at 580 nm in addition to the peak at 420 nm. In order to obtain optimum experimental conditions, temperature, and time of reaction were optimized, and the ratio of absorbance obtained at 580 nm and 420 nm (A580/A420) were monitored. The A580/A420 is proportional to the concentration of paraquat. Under the most favorable condition, the calibration curve showed a high level of linearity ranging from 6.0 × 10–4 to 1.0 × 10–3 M, and the detection limit was found to be 8.30 × 10–6 M. Silver nanoparticles capped with p-hydroxybenzoic acid was found to be useful for the colorimetric determination of paraquat in the aqueous medium.

Published
2020

5. Silver Nanoparticles Capped with p-Hydroxybenzoic Acid as a Colorimetric Sensor for the Determination of Paraquat

Author

Bambang Rusdiarso, Eko Sri Kunarti, Gusrizal Gusrizal, and Sri Juari Santosa

Subjects
Detection limit, 0303 health sciences, Calibration curve, Chemistry, Nanoparticle, 02 engineering and technology, General Chemistry, 021001 nanoscience & nanotechnology, Silver nanoparticle, Absorbance, 03 medical and health sciences, chemistry.chemical_compound, Paraquat, Surface plasmon resonance, Absorption (chemistry), 0210 nano-technology, 030304 developmental biology, Nuclear chemistry
Abstract

Highly stable silver nanoparticles capped with p-hydroxybenzoic acid were synthesized by reducing silver ion with p-hydroxybenzoic acid and used for the detection of paraquat. The synthesized silver nanoparticles, which are yellow, exhibited an absorption peak at 420 nm when measured with a UV-visible spectrophotometer due to the surface plasmon resonance. In the presence of paraquat, the color of silver nanoparticles changed from yellow to purple accompanied by the appearance of a new peak at 580 nm in addition to the peak at 420 nm. In order to obtain optimum experimental conditions, temperature, and time of reaction were optimized, and the ratio of absorbance obtained at 580 nm and 420 nm (A580/A420) were monitored. The A580/A420 is proportional to the concentration of paraquat. Under the most favorable condition, the calibration curve showed a high level of linearity ranging from 6.0 × 10–4 to 1.0 × 10–3 M, and the detection limit was found to be 8.30 × 10–6 M. Silver nanoparticles capped with p-hydroxybenzoic acid was found to be useful for the colorimetric determination of paraquat in the aqueous medium.

Published
2020

6. DETERMINATION OF pH EFFECT AND CAPACITY OF HEAVY METALS ADSORPTION BY WATER HYACINTH (Eichhornia crassipes) BIOMASS

Author

Gusrizal Gusrizal and Anis Shofiyani

Subjects
Eichhornia crassipes, Adsorption, biology, Hyacinth, Chemistry, Environmental chemistry, Biomass, Heavy metals, General Chemistry, biology.organism_classification
Abstract

Effect of pH and determination of adsorption capacity of Cu(II), Ni(II) and Pb(II) heavy metal ions on adsorbent prepared from Eichhornia crassipes (eceng gondok) biomass has been investigated. The influence of media acidity on the adsorption characteristics was carried out by determining ions adsorbed at various pH in the range of 2-10, while an adsorption isotherm model of Langmuir was used to estimate the capacity of adsorption. Results showed that Cu(II) was optimally adsorbed at the range pH of 5-6, Ni(II) at 2-4, while Pb(II) reached an optimum adsorption at pH 2-3. The adsorption data of Cu(II), Ni(II) and Pb(II) for the adsorbent folowed quite well Langmuir isotherm model, confirmed that such chemisorptions involved on that process. The ions adsorption capacities (am) were 27.47, 16.69, and 15.04 mg/g for Pb(II), Cu(II), and Ni(II), respectively. Keywords: adsorption, heavy metal, Eichhornia crassipes, pH, capacity

Published
2010

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