WO2019194688A1 - Procédés de préparation de matériaux nanocomposites biopolymère-silice modifiés pour élimination d'arsenic provenant d'eau contaminée et compositions à base de ceux-ci - Google Patents

Procédés de préparation de matériaux nanocomposites biopolymère-silice modifiés pour élimination d'arsenic provenant d'eau contaminée et compositions à base de ceux-ci Download PDF

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Publication number
WO2019194688A1
WO2019194688A1 PCT/PH2019/000004 PH2019000004W WO2019194688A1 WO 2019194688 A1 WO2019194688 A1 WO 2019194688A1 PH 2019000004 W PH2019000004 W PH 2019000004W WO 2019194688 A1 WO2019194688 A1 WO 2019194688A1
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WO
WIPO (PCT)
Prior art keywords
nanosilica
iron
beads
mixture
residue
Prior art date
Application number
PCT/PH2019/000004
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English (en)
Inventor
Milagros M. PERALTA
Original Assignee
University Of The Philippines Los Baños
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University Of The Philippines Los Baños filed Critical University Of The Philippines Los Baños
Publication of WO2019194688A1 publication Critical patent/WO2019194688A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer

Definitions

  • This invention relates to the use of nanomaterials from agricultural byproducts, particularly modified nanosilica, for arsenic remediation and removal from groundwater, and specifically to the methods of production of these materials.
  • Arsenic can be found in soil, water and air (Hughes et al, 2011). The occurrence of arsenic in air can be attributed to some anthropogenic activities such as mining and smelting. Such activities may be also considered as the major cause of arsenic contamination in water. Mining activities produce tailings that may contain heavy metals like lead, cadmium and arsenic. Exposure to this toxic metal may also come from food and medicines. Human exposure may be through inhalation, ingestion and dermal contact (Singh et al., 2007).
  • Nanotechnology which acts by adsorption and chemical precipitation .processes have the potential to address environmental concerns such as arsenic removal and are now being explored due to its high efficiency and low cost (Ahmed, 2011).
  • the nanoscale versions are expected to be more sensitive and efficient as a consequence of their small sizes and greater surface areas. Reducing the amount of arsenic in a given water system down to the maximum contamination limit ⁇ 10 ppb) requires an adsorbent that has strong affinity for both As3+ and As5+ .
  • the adsorbent should also have high surface area and accessible pores in order to facilitate effective arsenic adsorption (Sun et al., 2012).
  • Rice hull ash has been utilized in the synthesis of zeolites due to the increasing popularity of indigenous materials as a green raw materials for zeolite synthesis as the material is known to have high silica content (Sari et al., 2009; Chiarakom et a/., 2006).
  • the exterior of rice husk is mostly made up of silica.
  • the composition of rice husk is 40-500;6 cellulose, 25- 30% lignin, 15-20% ash and 8-15% moisture.
  • the range of its uses can be extended by incorporating various metal cations such as titanium, zinc or iron, varying the nature of the structure directing agents or varying the ratios of the precursor materials as well as the conditions for their preparation. Because of the presence of well-defined pores and channels, these materials are excellent host for gases, ions and organic molecules and can be used for environmental decontamination (Davis, 1992; Baelocher and Meier, 2001). Studies have shown that the addition of aluminum does not significantly increase the affinity of rice hull ash nanosilica for arsenic, on the other hand, addition of iron significantly improved the ability of the nanosilica to remove arsenic from contaminated water.
  • Hydrogels may also be used for encapsulating and removing environmental pollutants. Hydrogels are superabsorbent, non-water-soluble polymers that are quite responsive to environmental stimuli such as pH, temperature, ionic strength, magnetic field or specific chemicals. Although current applications are largely in the area of drug delivery because of the ability to encapsulate large molecules, emerging applications include biosensors and materials for environmental cleanup. Technologies such as US201714491 1 (‘911) and CN106111071 (‘071) have made use of silica materials and modified silica derivatives to purify waters contaminated with heavy metals. ‘911 , in particular, has produced a sulfydryl modified magnetic mesoporous Si02 to reduce cadmium in waste water.
  • CN 105540726 (726) on the other hand discloses a method for removing pentavalent arsenic from wastewater by adopting a magnetic chitosan/biochar composite material. These technologies however failed to disclose how to convert agricultural by-products such as rice hull ash to nanomaterials that will be utilized for the purification of water contaminated with heavy metals.
  • the present invention describes a process of producing iron-modified nanosilica powder and iron-modified nanosilica aerogel beads to be used for removing arsenic from water. It makes use of rice hull as its source of nanosilica. The isolated silica was then modified to increase its affinity for arsenic. DETAILED DESCRIPTION OF THE INVENTION
  • the process for producing the iron-modified nanosilica powder or beads is divided into two major stages - the preparation and purification of nanosilica from rice hull, and the preparation of iron-modified nanosilica powder or beads.
  • the iron source (ferric sulfate or ferric chloride) was first dissolved in 2.5 N NaOH. The excess iron was then filtered out using a Buchner funnel with a Whatman#4 filter paper. The purified nanosilica sample was then added to the alkaline solution of the iron salt and the resulting sol was stirred for 10 hours. It was then titrated with 5N H2SO4 to reduce the pH to 7.5 - 8.5. The resulting mixture was then filtered through a Buchner funnel using a Whatman#4 filter paper. The residue was then washed with deionized water. It was air dried, then oven dried at 120 °C for 12 hours.
  • Fe-Si Iron-Modified Silica
  • Nanosilica beads are placed in cartridges then installed/attached to a water source

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

La présente invention concerne des procédés de préparation de poudre de nanosilice modifiée par du fer et de billes à partir d'écorce de riz. La composition résultante est utilisée en tant qu'adsorbants de métaux lourds dans l'élimination de l'arsenic de l'eau contaminée. Ces matériaux permettent la réhabilitation d'eaux souterraines contaminées par l'arsenic à l'aide de nanomatériaux accessibles localement et durables.
PCT/PH2019/000004 2018-04-06 2019-04-03 Procédés de préparation de matériaux nanocomposites biopolymère-silice modifiés pour élimination d'arsenic provenant d'eau contaminée et compositions à base de ceux-ci WO2019194688A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PH12018050163 2018-04-06
PH12018050163 2018-04-06

Publications (1)

Publication Number Publication Date
WO2019194688A1 true WO2019194688A1 (fr) 2019-10-10

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PCT/PH2019/000004 WO2019194688A1 (fr) 2018-04-06 2019-04-03 Procédés de préparation de matériaux nanocomposites biopolymère-silice modifiés pour élimination d'arsenic provenant d'eau contaminée et compositions à base de ceux-ci

Country Status (1)

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WO (1) WO2019194688A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111330555A (zh) * 2020-03-13 2020-06-26 天津迪沃特生物电子科技有限公司 一种具有磁性的核壳式介孔硅胶材料及其制备方法和应用
WO2021101394A3 (fr) * 2019-11-20 2021-07-01 University Of The Philippines Los Baños Matériaux de silice nanostructurés modifiés pour élimination de métaux lourds d'eau contaminée et leurs procédés de production
CN117427481A (zh) * 2023-08-24 2024-01-23 葫芦岛康达环保工贸有限公司 一种基于纳米二氧化硅改性的除臭剂及其制备方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10013276A1 (de) * 1999-06-18 2000-12-21 Agency Ind Science Techn Poröse Siliziumdioxidkugeln und Verfahren zu deren Herstellung
CN105540726A (zh) 2016-03-08 2016-05-04 湖南大学 一种磁性壳聚糖/生物炭复合材料去除废水中五价砷的方法
CN104475011B (zh) * 2014-12-15 2016-08-17 江南大学 一种脱除食用油中黄曲霉毒素的磁性介孔二氧化硅吸附剂的制备方法
CN106111071A (zh) 2016-08-04 2016-11-16 江南大学 一种消减废水中重金属镉的巯基改性磁性介孔SiO2的制备方法
US20170144911A1 (en) 2015-10-30 2017-05-25 Process Research Management Inc. Removal of arsenic from contaminated aqueous solutions
US20170304807A1 (en) * 2014-11-26 2017-10-26 IFP Energies Nouvelles Method for preparation of a fischer-tropsch catalyst with vapor treatment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10013276A1 (de) * 1999-06-18 2000-12-21 Agency Ind Science Techn Poröse Siliziumdioxidkugeln und Verfahren zu deren Herstellung
US20170304807A1 (en) * 2014-11-26 2017-10-26 IFP Energies Nouvelles Method for preparation of a fischer-tropsch catalyst with vapor treatment
CN104475011B (zh) * 2014-12-15 2016-08-17 江南大学 一种脱除食用油中黄曲霉毒素的磁性介孔二氧化硅吸附剂的制备方法
US20170144911A1 (en) 2015-10-30 2017-05-25 Process Research Management Inc. Removal of arsenic from contaminated aqueous solutions
CN105540726A (zh) 2016-03-08 2016-05-04 湖南大学 一种磁性壳聚糖/生物炭复合材料去除废水中五价砷的方法
CN106111071A (zh) 2016-08-04 2016-11-16 江南大学 一种消减废水中重金属镉的巯基改性磁性介孔SiO2的制备方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021101394A3 (fr) * 2019-11-20 2021-07-01 University Of The Philippines Los Baños Matériaux de silice nanostructurés modifiés pour élimination de métaux lourds d'eau contaminée et leurs procédés de production
CN111330555A (zh) * 2020-03-13 2020-06-26 天津迪沃特生物电子科技有限公司 一种具有磁性的核壳式介孔硅胶材料及其制备方法和应用
CN117427481A (zh) * 2023-08-24 2024-01-23 葫芦岛康达环保工贸有限公司 一种基于纳米二氧化硅改性的除臭剂及其制备方法
CN117427481B (zh) * 2023-08-24 2024-04-09 葫芦岛康达环保工贸有限公司 一种基于纳米二氧化硅改性的除臭剂及其制备方法

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