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AuthorIhsanullah
AuthorAbbas, Aamir
AuthorAl-Amer, Adnan M.
AuthorLaoui, Tahar
AuthorAl-Marri, Mohammed J.
AuthorNasser, Mustafa S.
AuthorKhraisheh, Majeda
AuthorAtieh, Muataz Ali
Available date2021-06-03T10:07:40Z
Publication Date2016
Publication NameSeparation and Purification Technology
ResourceScopus
ISSN13835866
URIhttp://dx.doi.org/10.1016/j.seppur.2015.11.039
URIhttp://hdl.handle.net/10576/18535
AbstractThe scarcity of water, especially in arid and semi-arid regions of the world is exerting great pressure on resources and establishing more need to provide good quality water for human and other consumptions. Water recovery/recycle/reuse has proven to be effective and successful in creating a new and reliable water supply. Accordingly, attention is being paid to the effective treatment of alternative sources of water (apart from fresh water) such as seawater, storm water, wastewater (e.g. treated sewage water), and industrial wastewater. In this review, the use of carbon nanotubes (CNTs), member of the fullerene structural family, is considered with special focus on the removal of heavy metals from water (lead, chromium, cadmium, arsenic, copper, zinc and nickel). A critical review into the adsorption behavior and use of the CNTs is given with attention being paid to the effects of surface modifications on the adsorption behavior and subsequent heavy metal removal. A review of the effect of a number of key variables including pH, CNTs dosage, time, ionic strength, temperature and surface charge are given. It will be demonstrated that, surface modification enhances positively the adsorption capacity of CNTs towards cadmium, chromium, lead, mercury, copper, zinc, cobalt and nickel as did the solution pH. CNTs have been proven to an excellent adsorbent for the removal of different heavy metals from water. However, most of the applications of CNTs are on lab scale in batch experiments. In spite of high costs, CNTs are expected to be a promising adsorbent in the future due to its high adsorption capacity compared to many traditional adsorbents. Researchers are also in quest of novel environment friendly techniques for the surface modification of CNTs to further improve their properties. Still, the feasibility of CNTs application in large scale treatment needs to be further studied. Effective techniques for regeneration/reuse of CNTs also need to be explored yet. One of the main hurdles that limit the applications of CNTs in large scale operation is the cost of CNTs. Future research works on developing a cost-effective way of CNT production and testing the toxicity of CNTs and CNT-related materials are recommended.
SponsorThe authors would like to acknowledge the support provided by King Abdulaziz City for Science and Technology (KACST) through Science & Technology Unit at King Fahd University of Petroleum & Minerals (KFUPM) for funding this work through Project No: 13-ADV161-04 as part of the National Science Technology and Innovation Plan (NSTIP).
Languageen
PublisherElsevier
SubjectAdsorption
Carbon nanotubes
Heavy metals
Water treatment
TitleHeavy metal removal from aqueous solution by advanced carbon nanotubes: Critical review of adsorption applications
TypeArticle Review
Pagination141-161
Volume Number157


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