Next Article in Journal
Removal of Uranium from Contaminated Water by Clay Ceramics in Flow-Through Columns
Previous Article in Journal
Low Impact Development Planning and Adaptation Decision-Making under Climate Change for a Community against Pluvial Flooding
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessArticle
Water 2017, 9(10), 757;

Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100083, China
Author to whom correspondence should be addressed.
Received: 11 August 2017 / Revised: 27 September 2017 / Accepted: 29 September 2017 / Published: 1 October 2017
Full-Text   |   PDF [4763 KB, uploaded 1 October 2017]   |  


Steel slag, which makes up a gigantic amount of metallurgical industrial solid waste, was in this experiment successfully synthesized an inexpensive adsorbent used to remove nitrate pollution from aqueous solution. This adsorbent was obtained by mixing steel slag, aluminium hydroxide and deionized water, and aging this at a mass ratio of 3:0.45:2, and then activating it at 800 °C. The physicochemical characteristics of the steel slag before and after modification were investigated to compare the effect of their surface properties on the adsorption behaviour of nitrate. The effects of adsorbent dosage, pH, and contact time on the adsorption process were investigated. The results showed that an increase in specific surface area and the formation of a positive surface of the modified steel slag (MSS) compared with the original steel slag (OSS) could effectively increase the number of the active adsorption sites and nitrate removal ability. The optimum parameters for nitrate removal were as follows: the concentration of nitrate was 20 mg/L, the dosage was 1 g/100 mL, the pH was four, and the reaction time was 180 min. The adsorption capacity of the MSS was approximately 1.9 times that of the OSS. The nitrate adsorption of the MSS was in accordance with the pseudo-second-order model and the Freundlich model, which indicated that the adsorption of nitrate on the MSS was mainly single layer chemical adsorption. The mechanism of nitrate removal mainly included ion exchange, hydrogen bonding, electrostatic interactions and intermolecular interactions. In addition, regeneration experiments indicated that the MSS after regeneration still had the capacity to remove nitrate. View Full-Text
Keywords: nitrate; modified steel slag; adsorption; mechanism; regeneration nitrate; modified steel slag; adsorption; mechanism; regeneration

Figure 1

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).

Share & Cite This Article

MDPI and ACS Style

Yang, L.; Yang, M.; Xu, P.; Zhao, X.; Bai, H.; Li, H. Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag. Water 2017, 9, 757.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Water EISSN 2073-4441 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top