期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 25, 期 27, 页码 27235-27244出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-2750-3
关键词
Radiation grafting; EVOH; Sodium styrene sulfonate; Adsorption; Ammonium removal
资金
- National Natural Science Foundation of China [11475112]
- Nuclear Technology Special Fund of Hubei University of Science and Technology [2018-19KZ02, 2016-18X044, 2018-19X048]
- Key Project of Technological Innovation of Hubei Province [2017AEA107]
An adsorbent EVOH-g-SSS(H) was successfully synthesized for ammonium removal by one-step grafting SSS onto EVOH particles directly using radiation-induced grafting technique followed by protonation. The effects of adsorbed dose and monomer concentration on grafting yield were investigated. The adsorption behaviors of the EVOH-g-SSS(H) towards ammonium ions (NH4 (+)) were discussed. The adsorption isotherm of NH4 (+) was a followed Langmuir model with the maximum adsorption capacity of 22.53 mg/g at optimal pH 6.5. For comparison, adsorption kinetics towards NH4 (+) removal by EVOH-g-SSS(H) and commercially available DIAION PK228 were studied. Both adsorbents were better obeyed pseudo-second-order mode. EVOH-g-SSS(H) for NH4 (+) uptake was faster than PK228 and reached equilibrium within 5 min. Column experiment showed that the column adsorption capacity of EVOH-g-SSS(H) adsorbent was 9.69 mg/g-ad at SV 10 h(-1). The NH4 (+) concentration in outlet solution can maintain at a very low level even SV was as high as 800 h(-1). The elution curve showed the EVOH-g-SSS(H) adsorbent can be regenerated using 1 M HCl. Besides, the removal percentage of NH4 (+) can be 97% from actual groundwater within 1 min. Such high adsorption efficiency of EVOH-g-SSS(H) makes it to be employed as an adsorbent for NH4 (+) removal in practical application.
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