Bench-scale production of filters for the removal of arsenic from contaminated water using modified biopolymer-silica nanocomposite materials

Date

2016

Abstract

Bench-scale production of iron-modified nanosilica beads from rice hull was done by extraction of silica from rice hull ash and titrating the purified nanosilica with acetic acid. Iron (3) sulfate was added before dropping the solution in a beaker with aqueous ammonia with surfactant and hexane to achieve the beads’ spherical shape. The beads were oven-dried at 120 deg C for 2 hours. BET analysis (surface area – 348.855 sqm/g; porosity – 17.152 A) supports the AFM result (7.95 +- 1.11 nm) and confirm that the produced beads were nanosized materials. The X-ray diffraction pattern proves that the produced beads were amorphous and free from any impurity. DPASV analysis of As (3) and As (5) solutions produced LOD and LOQ for As(3): 2.25 ppb and 7.49 ppb and As(5): 9.69 and 23.19 ppb, respectively. Adsorption studies on standing mode revealed that 10 g of nanosilica beads remove 95% arsenic in standard solutions for 6 hours while shaking mode removes 98% arsenic using 2.5 g of beads for 2 hours. Water samples from the provinces of Bulacan, Batangas, and Laguna [Philippines] were collected and analyzed for As (3) and total arsenic content using voltammetry and ICP-OES. The highest total arsenic content for the water samples came from the pump houses RAC (333.024 ppb), RCS (112.789 ppb), and RLV (113.162 ppb), and RLV (113.162 ppb). These values were verified using ICP-OES and at 95% confidence level, there is no significant difference between the total arsenic content obtained from the voltammetric and ICP-OES analysis.

Language

English

Document Type

Article

Pages /Collation

76 leaves

En – AGROVOC descriptors

RICE HUSKS; SILICA; EXTRACTION; ARSENIC; CONTAMINATION; WATER; WATER PURIFICATION; BIOPOLYMERS; ACETIC ACID; CHEMICAL PRECIPITATION

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