Related Experiment Video
Updated: Jan 21, 2026
09:43
Study of Short Peptide Adsorption on Solution Dispersed Inorganic Nanoparticles Using Depletion Method
Published on: April 11, 2020
7.1K
Modified Double Potential Step Chronoamperometry (DPSC) Method for As(III) Electro-oxidation and Concomitant As(V)
Zhao Song1, Shikha Garg1, Jinxing Ma1
1UNSW Water Research Centre, School of Civil and Environmental Engineering , The University of New South Wales , Sydney , New South Wales 2052 , Australia.
Environmental Science & Technology
|July 24, 2019
Summary
A new electrochemical method efficiently removes arsenic(III) by oxidizing it to arsenic(V) and adsorbing it onto electrodes, particularly effective at higher pH levels.
Area of Science:
- Environmental Science
- Electrochemistry
- Water Treatment
Background:
- Arsenic(III) removal is challenging due to low energy efficiency and ineffectiveness at neutral pH.
- Existing technologies struggle with efficient arsenic(III) remediation.
Purpose of the Study:
- To introduce a modified double potential step chronoamperometry (DPSC) method for arsenic(III) removal.
- To demonstrate proof of concept for As(III) oxidation and As(V) electro-sorption.
Main Methods:
- Modified double potential step chronoamperometry (DPSC) for in situ oxidation and electro-sorption.
- Investigation of pH effects on oxidation and sorption rates.
- Development of a mathematical model for process kinetics.
Main Results:
- High oxidation and sorption/desorption rates observed at elevated pH.
- Effective removal linked to deprotonated As(III) species and strong As(V) interactions.
- Reduced total arsenic from 150 to 15 μg L⁻¹ with low energy consumption (0.06 kWh m⁻³).
Conclusions:
- The modified DPSC method offers an efficient approach for arsenic(III) removal.
- pH and electrochemical interactions are critical factors for process performance.
- A developed mathematical model can predict and optimize arsenic removal.
Related Concept Videos
01:15Handwashing III: During the Procedure and Post-Procedure Steps
2.2K
To wash hands properly, follow these steps:
2.2K
01:19Electro-mechanical Systems
1.6K
Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
1.6K
01:21Methods of Documentation III: PIE
2.1K
Problem-intervention-evaluation (PIE) is a systematic approach to documentation used in healthcare settings for clinical decision-making and patient care planning. It is a structured approach to organizing patient data based on problems, interventions, and evaluations. Here's a breakdown of its key features and considerations:
2.1K
01:09Analyte Adsorption and Distribution
2.5K
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
2.5K
03:14Oxidation Numbers
42.2K
In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
42.2K
03:08Rate-Determining Steps
36.8K
Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
36.8K