Electrochemical recovery of nickel from acid extracts of leaf ash of the nickel-hyperaccumulating plant Rinorea bengalensis

Date

6-2015

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Monet Concepcion M Detras

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

The recovery of nickel via electrodeposition from the acid extracts of leaf ash of the nickel-hyperaccumulating plant Rinorea bengalensis was evaluated with respect to its technical feasibility. Initially, electrodeposition was performed on a model system based on simulated acid extracts. Nickel-ion removal from solution followed a second-order behavior, attributed to the time variability of the current efficiency. The operating current had a significant effect (a=0.05) on both nickel removal efficiency and nickel recovery, but not on the purity. At the best level of current (^A), the removal, purity, and recovery were 90.61%, 100%, and 93.36%, respectively. Preliminary cost estimation of energy requirement using the charge dose concept gave an equivalent electrical energy requirement of 405.55kWh/kg Ni removed, resulting to an electrical energy cost of Php 3,500per kg of Ni removed. The high cost was attributed to the low current efficiency, which ranged from 5% to 10%. Higher initial nickel concentrations and/ or lower operating current density are recommended to increase current efficiency and nickel recovery. Validation experiment using acid extracts from actual leaf ash verified the recovery of nickel. Electrodeposition at 6 A yielded removal, purity, and recovery values of 77.48%, 89.68% and 94.77%, respectively.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2015 E62 /G69

Document Type

Thesis

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