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Flocculation Performance of Hyperbranched Polyethyleneimine-grafted-Cellulose in Wastewater Treatment Lian-Wei Zhang, Jia-Rui Hua, Wen-Jing Zhu, Lin Liu, Xiao-Lin Du, Ran-Ju Meng, and Juming Yao ACS Sustainable Chem. Eng., Just Accepted Manuscript • DOI: 10.1021/ acssuschemeng.7b02343 • Publication Date (Web): 18 Dec 2017 Downloaded from http://pubs.acs.org on December 19, 2017
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Flocculation Performance of Hyperbranched
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Polyethyleneimine-grafted-Cellulose in Wastewater
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Treatment
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Lian-Wei Zhang,† Jia-Rui Hua, † Wen-Jing Zhu, † Lin Liu,∗,†,‡ Xiao-Lin Du,† Ran-Ju
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Meng, † and Ju-Ming Yao*, †,‡
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†
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of Ministry of Education, College of Materials and Textiles, Zhejiang Sci-Tech
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University, 928 Second Avenue, Xiasha Higher Education Park, Hangzhou 310018,
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China
The Key Laboratory of Advanced Textile Materials and Manufacturing Technology
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‡
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Hangzhou 310018, China
National Engineering Lab of Textile Fiber Materials & Processing Technology,
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*Corresponding author: Associate Professor Lin Liu
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Email:
[email protected] Tel: +86-571-86843618
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Fax: +86-571-86843619
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ABSTRACT: A green, high efficient flocculant based on hyperbranched
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polyethyleneimine-grafted-cellulose (hPEI-CE) was designed and synthesized
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successfully. The flocculation performance of the hPEI-CE with different amino
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group contents for treating simulated kaolin wastewater was evaluated in terms of
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turbidity, floc size, and zeta potential. Without the help of any coagulant aid, hPEI-CE
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with amino group content of 3.97 mmol/g presented the best removal efficiency for
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kaolin particles. The residual turbidity of kaolin suspension decreased from original
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490 NTU to 4 NTU under the optimized conditions, i.e. 2.4 mg/L of hPEI-CE
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flocculant at pH 7.0 for 30 min. Further, two types of industrial wastewater, silk
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printing and dyeing wastewater and machining wastewater were used to investigate
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the flocculation performance of hPEI-CE. Total suspended solid (TSS), chemical
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oxygen demand (COD), turbidity reduction reached upto 73.4%, 95.7% and 87.4% for
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silk printing and dyeing wastewater, 96.2%, 79.9%, 93.5% for machining wastewater,
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respectively at each original pH condition. Moreover, high effective removal of
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ammonia nitrogen, total iron and total phosphorus were also obtained. pH of the
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effluent approximated neutral. All the results show that the hPEI-CE flocculant has
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great application prospect in wastewater treatment.
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KEYWORDS: Polyethyleneimine-grafted-cellulose; Flocculation; Tubidity; COD
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removal; Charge neutralization
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■ INTRODUCTION
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Recently, water pollution caused by industrial discharges of printing and dyeing,
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papermaking, mechanical processing, pharmaceutical industries and so on, becomes
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more and more serious. The presence of industrial hazardous wastes, even at trace
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concentrations, can influence the quality of natural water and bring a toxic hazard to
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ecosystems and living organisms.1-4 So far, a large number of efforts, such as the
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development and application of various coagulation-flocculation, adsorption,
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membrane filtration, advanced oxidation processes, have been reported to eliminate
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these hazardous wastes.5-8 Among aforesaid methods, coagulation-flocculation is a
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high-efficient and widely applied water purification technology due to its simplicity
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of the equipment, mild operation, and high efficiency in treating a wide range of
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pollutants.9-12
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In the past decades, diverse inorganic coagulants/flocculants such as iron,
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aluminum, and titanium salts, as well as organic flocculants like anionic and cationic
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polyacrylamide (PAM), have been developed and applied in industrial wastewater
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treatment.13-23
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coagulants/flocculants which limit their applications. The effluent quality is poor
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when iron salts as coagulants due to its corrosivity, deeper color, unpleasant metallic
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taste, and odor. Especially the main issue of Al/Fe coagulation system is the handling
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of produced massive coagulation sludge. Recently, some studies employed titanium
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salts (e.g. TiCl4) as an alternative coagulant and suggested comparable treatment
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efficiency with iron or aluminum salts.24-27 Also, it has been reported that the
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chemical sludge of TiCl4 could be recycled to produce catalytic material, TiO2,
However,
there
are
still
some
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of
these
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offering a novel sludge disposal solution. However, high hydrolysis rate of titanium
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salt makes storage and transport difficultly. And high acidity (pH
