Journal
APPLIED SURFACE SCIENCE
Volume 385, Issue -, Pages 333-340Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2016.05.112
Keywords
Pentaerythritol; Cationic star polymers; Clay; Adsorption; Cr(VI)
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Funding
- National Natural Science Foundation of China [21466005, 21306027]
- Guangxi Natural Science Foundation [2014GXNSFAA118036]
- Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology [2014Z003]
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Pentaerythritol (PER) was esterified with 2-bromoisobutyryl bromide to synthesize a four-arm initiator 4Br-PER for atom transfer radical polymerization (ATRP). Star-shaped copolymers (P(AM-co-DMAEMA)(4), CSP) were prepared via ATRP using dimethyl aminoethyl methacrylate (DMAEMA) and acrylamide (AM) as comonomers, while Br-PER and CuBr/2,2'-bipyridine (BPY) as the initiator and the catalyst, respectively. The resulting four-arm initiator and star-shaped polymer (CSP) were characterized with FT-IR, H-1 NMR and Ubbelohde viscometry. Alkaline clay (AC) was immobilized with CSPs to yield amino groups, and the cationic star polymer-immobilized alkaline clay (CSP-AC) was applied to remove Cr(VI) from the aqueous solution in batch experiments. Various influencing factors, including pH, contact time and immobilization amount of CSP on adsorption capacity of CSP-AC for Cr(VI) were also investigated. The results demonstrated that Cr(VI) adsorption was highly pH dependent. The optimized pH value was 4.0. The adsorption isotherms of the adsorbent fit the Langmuir model well, with the maximum adsorption capacity of 137.9 mg/g at 30 degrees C. The material should be a promising adsorbent for Cr(VI) removal, with the advantages of high adsorption capacity. (C) 2016 Elsevier B.V. All rights reserved.
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