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Selective sorption of divalent cations using a high capacity sorbent.

Alan J Du¹, Darren D Sun, James O Leckie

¹School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore.

Journal of Hazardous Materials

|February 8, 2011

Summary

Sodium titanate nanotube (STN) effectively partitions divalent cations from wastewater. STN shows high capacity for lead and cadmium, demonstrating its potential for industrial wastewater treatment.

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Area of Science:

Environmental Chemistry
Materials Science
Nanotechnology

Background:

Industrial wastewater often contains toxic divalent cations.
Effective removal of these cations is crucial for environmental protection.
Novel sorbent materials are needed for efficient metal ion partitioning.

Purpose of the Study:

To investigate the sorption capacity and selectivity of sodium titanate nanotube (STN) for various divalent cations.
To evaluate STN's potential as a sorbent for industrial wastewater treatment.
To understand the factors influencing divalent cation sorption by STN.

Main Methods:

Sorption experiments were conducted using seven divalent cations (Pb, Cd, Cu, Zn, Ca, Sr, Ni).
Tests were performed at controlled pH (3 ± 0.02) and ionic strength (0.1M).
Competitive sorption tests were used to assess STN's performance in a simulated industrial wastewater matrix.

Main Results:

STN exhibited high sorption capacities for lead (1.27 mmol/g) and cadmium (0.39 mmol/g).
The affinity order for divalent cations was Pb ≫ Cd>Cu>Zn>Ca>Sr>Ni.
STN preferentially sorbed cadmium over other coexisting metals in competitive tests, indicating its suitability for selective Cd removal.

Conclusions:

Sodium titanate nanotube (STN) is a promising novel sorbent for removing divalent cations, particularly cadmium, from industrial wastewater.
The sorption behavior of STN is influenced by cation properties like hydrolysis constant and electronegativity, with notable exceptions like nickel.
STN's preferential sorption of cadmium makes it a viable option for targeted metal ion separation in complex wastewater streams.