Removal of Pb2+ Ion from Industrial Wastewater by New Efficient Biosorbents of Oyster Plant (Tradescantia spathacea Steam) and Negkassar Leaf (Mammea siamensis T. Anderson)
Kannika Keawkim and Achjana Khamthip* Author for corresponding; e-mail address: k.kannika2252@gmail.com
Volume: Vol.45 No.1 (January 2018)
Research Article
DOI:
Received: 27 Febuary 2017, Revised: -, Accepted: 29 May 2017, Published: -
Citation: Keawkim K. and Khamthip A., Removal of Pb2+ Ion from Industrial Wastewater by New Efficient Biosorbents of Oyster Plant (Tradescantia spathacea Steam) and Negkassar Leaf (Mammea siamensis T. Anderson), Chiang Mai Journal of Science, 2018; 45(1): 369-379.
Abstract
This work, low-cost biosorbents were prepared from Oyster plant (OP) and Negkassar leaf (NL) for lead (Pb2+) removal. The chemical structures of sorbents were characterized by FT-IR and elemental analyzer (CHN). All experiments were conducted in a batch system. The pH (2-7) of a solution, contact time (15-180 min), the dosage of biosorbent (0.25-3.00 gdm-3) and the initial metal concentration (2-75 mg dm-3) were optimized. The adsorption kinetic of Pb2+ on sorbents was performed using pseudo-first-order and pseudo-second-order model. Results are good agreement with pseudo-second-order, which described that the mechanism is controlled by chemical adsorption. The adsorption process was examined by Langmuir and Freundlich isotherm. The Langmuir isotherm gave a better fit than the Freundlich isotherm. It can be implied that the single layer sorption of Pb2+ occurs on the sorbent surface. The maximum adsorption capacity (qmax) of Pb2+ on OP and NL is 161.29 and 104.17 mg g-1, respectively. In addition, the effective sorbent of OP and NL can be applied to remove Pb2+ from wastewater samples.