Ranking traditional and nano-enabled sorbents for simultaneous removal of arsenic and chromium from simulated groundwater

被引:19
作者
Gifford, Mac [1 ]
Hristovski, Kiril [2 ]
Westerhoff, Paul [1 ]
机构
[1] Arizona State Univ, Sch Sustainable Engn & Built Environm, 660 South Coll Ave, Tempe, AZ 85281 USA
[2] Arizona State Univ, Polytech Sch, Mesa, AZ 85212 USA
关键词
Nanocomposite sorbents; Hexavalent chromium; Arsenic; Simultaneous removal; Sorption; ION-EXCHANGE MEDIA; ADSORPTION; WATER;
D O I
10.1016/j.scitotenv.2017.05.126
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Water from many municipal and private wells are treated to meet arsenic (As(V)) regulations, and new regulations for hexavalent chromium(Cr(VI)) are soon possible. Rather than adding costly capital infrastructure, we explored many types of sorbents' ability to remove both oxygenated anions simultaneously. In laboratory pseudo-equilibrium tests, metal (hydr) oxide sorbents demonstrated high affinity for As(V) but exhibited 30 to 100-fold lower capacities to remove Cr(VI). WBAX resins had some ability to sorb both Cr(VI) and As(V), but competing anions lowered their sorption capacity for As(V) by > 90% compared to in a deionized water matrix. Nano-enabled sorbents with iron or titanium nanoparticles embedded inside the porous structure of an anion exchange resin demonstrated high ability to remove both pollutants simultaneously despite competition, with the tested sorbents showing 11 mu mol/g capacity for Cr(VI) and 19 mu mol/g for As(V) in simulated groundwater on average. To quantitatively rank sorbents' ability to remove multiple pollutants, a Simultaneous Removal Capacity scoring tool is proposed. This index uses both absolute removal capacity for each contaminant and relative capacity for multiple contaminants, and may be applied to simultaneous removal of any set of aqueous or atmospheric contaminants. Here, the five nano-enabled sorbents ranked in the top seven out of twelve sorbents tested for simultaneous Cr(VI) and As(V) removal. This work demonstrated traditional and novel nano-enabled sorbents can reduce multiple contaminants of health concern, resulting in groundwater treated to drinking water standards. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:1008 / 1014
页数:7
相关论文
共 26 条
[1]   The pore surface diffusion model as a tool for rapid screening of novel nanomaterial-enhanced hybrid ion-exchange media [J].
Athanasaki, Grigoria ;
Sherrill, Laurie ;
Hristovski, Kiril D. .
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY, 2015, 1 (04) :448-456
[2]   Intraparticle diffusion and adsorption of arsenate onto granular ferric hydroxide (GFH) [J].
Badruzzaman, M ;
Westerhoff, P ;
Knappe, DRU .
WATER RESEARCH, 2004, 38 (18) :4002-4012
[3]  
Brandhuber P., 2004, Low-Level Hexavalent Chromium Treatment Options: Bench-Scale Evaluation
[4]  
Coachella Valley Water District, 2014, 2013 14 ANN REV
[5]   Bifunctional resin-ZVI composites for effective removal of arsenite through simultaneous adsorption and oxidation [J].
Du, Qiong ;
Zhang, Shujuan ;
Pan, Bingcai ;
Lv, Lu ;
Zhang, Weiming ;
Zhang, Quanxing .
WATER RESEARCH, 2013, 47 (16) :6064-6074
[6]  
Elton J, 2013, ACS SYM SER, V1123, P223
[7]  
Haynes W. M., 2015, SECTION 5 THERMOCHEM
[8]   Simultaneous removal of perchlorate and arsenate by ion-exchange media modified with nanostructured iron (hydr)oxide [J].
Hristovski, Kiril ;
Westerhoff, Paul ;
Moller, Teresia ;
Sylvester, Paul ;
Condit, Wendy ;
Mash, Heath .
JOURNAL OF HAZARDOUS MATERIALS, 2008, 152 (01) :397-406
[9]   Batch and column sorption of arsenic onto iron-impregnated biochar synthesized through hydrolysis [J].
Hu, Xin ;
Ding, Zhuhong ;
Zimmerman, Andrew R. ;
Wang, Shengsen ;
Gao, Bin .
WATER RESEARCH, 2015, 68 :206-216
[10]  
Impellitteri C., 2007, STATE IND TREATMENT