Phosphonium-enhanced chitosan for Cr(VI) adsorption in wastewater treatment

被引：104
作者：
Sessarego, Sebastian [1 ]
Rodrigues, Simone C. G. [2 ]
Xiao, Ye [1 ]
Lu, Qingye [1 ]
Hill, Josephine M. [1 ]
机构：
[1] Univ Calgary, Dept Chem & Petr Engn, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada
[2] IFPI Fed Inst Educ Sci & Technol Piaui, BR 402,Km 3 S-N, BR-65215000 Parnaiba, PI, Brazil
来源：
CARBOHYDRATE POLYMERS | 2019年 / 211卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Chitosan; Adsorption; Chromium; Phosphonium; Wastewater; HEXAVALENT CHROMIUM; REMOVAL; DERIVATIVES; EFFICIENT; ACID; WEIGHT; DESIGN; CHITIN;
D O I：
10.1016/j.carbpol.2019.02.003
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Adsorption is a commonly used method for industrial wastewater treatment because of its low-cost, easy operation and high efficiency. In this work, chitosan was crosslinked and functionalized with a low-cost phosphonium salt, tetrakis(hydroxymethyl) phosphonium sulfate (THPS), to enhance its adsorption capacity for Cr (VI). The novel phosphonium-crosslinked chitosan (PCC) was characterized using elemental analysis, XRF, FTIR, NMR and SEM-EDX. At pH 6, PCC had a higher Langmuir equilibrium constant than the unmodified chitosan (0.19 +/- 0.02 L mg(-1) versus 0.0044 +/- 0.0005 L mg(-1)) and PCC demonstrated higher adsorption capacity than chitosan at equilibrium Cr(VI) concentrations below 120 mg L-1. Additionally, magnesium sulfate or magnesium chloride was shown to desorb Cr(VI) and recycle PCC. When treated with THPS, chitosan is activated for Cr(VI) adsorption at pH 6; therefore, PCC can be used in wastewater treatment over a wider pH range than chitosan.
引用
收藏
页码：249 / 256
页数：8
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