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
Recommended Citation
Gonzaga, Ian Lorenzo E., "Electrochemical recovery of nickel from acid extracts of leaf ash of the nickel-hyperaccumulating plant Rinorea bengalensis" (2015). Undergraduate Theses. 4014.
https://www.ukdr.uplb.edu.ph/etd-undergrad/4014
Document Type
Thesis