Next Article in Journal
Mulching and Fertilization Effects on Weed Dynamics under Conservation Agriculture-Based Maize Cropping in Zimbabwe
Previous Article in Journal
Correction: Elias, M.; et al. 2015. Land Conversion Dynamics in the Borana Rangelands of Southern Ethiopia: An Integrated Assessment Using Remote Sensing Techniques and Field Survey Data. Environments 2015, 2, 1–31
Article Menu

Export Article

Open AccessArticle
Environments 2015, 2(3), 388-398; doi:10.3390/environments2030388

Comparative Sorption of Methylene Blue onto Hydrophobic Clays

1
Science Department, Borough of Manhattan Community College, The City University of New York, New York, NY 10007, USA
2
Bergen County Academies, Hackensack, NJ 07601, USA
3
Chemistry Department, College of Arts and Science, New York University, New York, NY 10003, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Yu-Pin Lin
Received: 28 May 2015 / Revised: 27 July 2015 / Accepted: 28 July 2015 / Published: 5 August 2015
View Full-Text   |   Download PDF [798 KB, uploaded 5 August 2015]   |  

Abstract

Chemical modifications of clay to remove methylene blue (MB) from aqueous solutions at room temperature were compared. Natural bentonite (NC) was modified by cation exchange with hexadecyltrimethylammonium chloride (HC), bencyltriethylammonium chloride (BC), and tetramethylammonium chloride (TC) to reverse the surface polarity of the hydrophilic bentonite. The adsorption of MB was studied and fitted by the adsorption theories of Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin. Equilibrium parameters were calculated, indicating that chemical modification did not improve the adsorption, due to the electrostatic adsorption mechanism. Specific surface area was determined, reporting the following trend: NC > TC > BC > HC. Isotherms show that TC is the best modified clay for the adsorption of MB with a capacity of 217 mg/g. Adsorbents were characterized by SEM and the determination of their point zero charge, indicating a charge reversal at pH 9.5 and a heterogeneous surface that is optimum for the adsorption of molecules and ions onto their surfaces. View Full-Text
Keywords: adsorption; isotherm; methylene blue; modified clay; point zero charge adsorption; isotherm; methylene blue; modified clay; point zero charge
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Sponza, A.D.; Fernandez, N.J.; Yang, D.; Ortiz, K.A.; Navarro, A.E. Comparative Sorption of Methylene Blue onto Hydrophobic Clays. Environments 2015, 2, 388-398.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Environments EISSN 2076-3298 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top