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Fabrication of nanosilica derived from rice husk coated onto stainless steel mesh for oil-water separation / Mark Harold M. de Chavez. 6

By: Mark Harold M. de Chavez. 4 0 16, [, ] | [, ] |

Contributor(s): 5 6 [] |

Language: Unknown language code Summary language: Unknown language code Original language: Unknown language code Series: ; April 2017.46Edition: Description: 28 cm. 93 ppContent type: text Media type: unmediated Carrier type: volumeISBN: ISSN: 2Other title: 6 []Uniform titles: | | Related works: 1 40 6 []Subject(s): -- 2 -- 0 -- -- | -- 2 -- 0 -- 6 -- | 2 0 -- | -- -- 20 -- | | -- -- -- -- 20 -- | -- -- -- 20 -- --Genre/Form: -- 2 -- Additional physical formats: DDC classification: | LOC classification: | | 2Other classification:

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Action note: In: Summary: ABSTRACT: Rice is an agro-waste material produced from rice milling. Silica, a major inorganic constituent of rice husk, could be extracted via mild acid treatment with thermal combustion. Its nanometer structural form could be obtained via alkaline precipitation method. This study reports the synthesis of nanosilica from rice husk using acid treatment, 1.0 M HCI, with thermal combustion, 700 C within 4 hours, as pre-treatment and alkaline precipitation method, sulphuric acid as catalyst, to obtain it. Characterization analysis such as FTIR, XFR - EDS, XRD and SEM were used to confirm its chemical and physical nature. The synthesized nanosilica was found out to be containing 17.300 - 0.49% silicon content with high chlorine and sulphur impurities and 30-50 nm in particle size. Its amorphous form was not confirmed using XRD due to sodium chloride and sodium sulphate impurities. Oil water separation was carried out using a modified mesh containing a polyelectrolyte-fluorosurfactant/ nanosilica (PFC/NS) composite. The mesh was coated with the composite via a one-step dip coating method in a PFC /NS suspension. Water passes through the mesh quickly via gravity and oil remains on the top of the mesh. The efficiency was found out to be 92.5% for motor oil and 94.56% for cooking oil. Its recyclability was reported to be up to 20 separation processes. The contact angles confirmed the oleophobic-hyrophilic property of the mesh. Other editions:

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Item type	Current location	Home library	Collection	Call number	Status	Date due	Barcode	Item holds
Book	PLM	PLM Filipiniana Section	Filipiniana-Thesis	T QD415.D43.2017 (Browse shelf)	Available		FT6212

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Thesis: (Bachelor of Science in Chemistry) - Pamantasan ng Lungsod ng Maynila, 2017. 56

ABSTRACT: Rice is an agro-waste material produced from rice milling. Silica, a major inorganic constituent of rice husk, could be extracted via mild acid treatment with thermal combustion. Its nanometer structural form could be obtained via alkaline precipitation method. This study reports the synthesis of nanosilica from rice husk using acid treatment, 1.0 M HCI, with thermal combustion, 700 C within 4 hours, as pre-treatment and alkaline precipitation method, sulphuric acid as catalyst, to obtain it. Characterization analysis such as FTIR, XFR - EDS, XRD and SEM were used to confirm its chemical and physical nature. The synthesized nanosilica was found out to be containing 17.300 - 0.49% silicon content with high chlorine and sulphur impurities and 30-50 nm in particle size. Its amorphous form was not confirmed using XRD due to sodium chloride and sodium sulphate impurities. Oil water separation was carried out using a modified mesh containing a polyelectrolyte-fluorosurfactant/ nanosilica (PFC/NS) composite. The mesh was coated with the composite via a one-step dip coating method in a PFC /NS suspension. Water passes through the mesh quickly via gravity and oil remains on the top of the mesh. The efficiency was found out to be 92.5% for motor oil and 94.56% for cooking oil. Its recyclability was reported to be up to 20 separation processes. The contact angles confirmed the oleophobic-hyrophilic property of the mesh.

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