Journal
WATER RESEARCH
Volume 59, Issue -, Pages 165-171Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2014.04.022
Keywords
Cellulose-based flocculant; Synthesis process; Flocculation characteristic; Flocculation mechanism; Eco-friendly
Funding
- National Natural Science Foundation of China [51172207, 61179034, 51372226]
- Natural Science Foundation of Zhejiang Province of China [LQ12C16005]
- Science and Technology Program of Zhejiang Province of China [2013C33011]
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This work presents a synthesis process and flocculation characteristics of an eco-friendly flocculant based on bamboo pulp cellulose (BPC) from Phyllostachys heterocycla. Ployacrylamide (PAM) was grafted onto the BPC by free-radical graft copolymerization in homogeneous aqueous solution. The optimal synthesis conditions of the bamboo pulp cellulose-graft-ployacrylamide flocculant (BPC-g-PAM) and its performance on wastewater treatments were investigated. A UV-based method was used to rapidly determine the degree of substitution (DS) of BPC. The results showed that, under the optimal synthesis conditions, the obtained BPC-g-PAM held a grafting ratio of 43.8% and DS of 1.31. Turbidity removal of the product reached 98.0% accompanying with the significant flocculation and sedimentation in target suspensions. The flocculation mechanism was explored by means of zeta potential method. For negatively charged contaminants, like kaolin clay particles, the BPC-g-PAM could remove the contaminants efficiently via bridging and charge neutralization in acidic or neutral environment. (C) 2014 Elsevier Ltd. All rights reserved.
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