RSC Advances p. 61817 - 61822 (2014)
Update date:2022-08-10
Topics:
Kameda, Tomohito
Kondo, Eisuke
Yoshioka, Toshiaki
Mg-Al layered double hydroxide (Mg-Al LDH) doped with Fe2+ was found to be superior to undoped Mg-Al LDH in the removal of Se(vi) from aqueous solutions. For both systems, Se(vi) as SeO42- was removed through anion exchange with intercalated Cl-. In the Fe2+-doped Mg-Al LDH, however, some of the Se(vi) was reduced to Se(iv) upon oxidation of Fe2+ to Fe3+ in the LDH host layer to produce SeO32-, which was also adsorbed by the Fe2+-doped Mg-Al LDH through anion exchange. The reduction of Se(vi) to Se(iv) is advantageous for Se(vi) removal by Fe2+-doped Mg-Al LDH due to the larger charge density of SeO32-. The Fe2+-doped Mg-Al LDH effectively removed Se(vi) from an aqueous solution because of the anion exchange properties of Mg-Al LDH and activity of Fe2+ as a reducing agent. Se(vi) removal occurs through Langmuir-type adsorption, where the maximum adsorption and equilibrium adsorption constant were 1.4 mmol g-1 and 1.6, respectively. Se(vi) removal is well expressed as a pseudo second-order reaction. The apparent rate constants at 10, 30, and 60°C were 1.2 × 10-3, 1.5 × 10-3, and 2.2 × 10-3 g mmol-1 min-1, respectively, and the apparent activation energy was 10.0 kJ mol-1. The rate-determining step is chemical adsorption through anion exchange of SeO42- and SeO32- with intercalated Cl-.
View MoreHebei Fulong Import & Export Co., Ltd.
Contact:86-311-87795661
Address:15A19 Zhongyuan Building,368 Youyi North Street,Shijiazhuang 050070,China
website:http://www.np-chem.com
Contact:0086-25-52346877
Address:199, Jian Ye Road, Nanjing, China
Contact:
Address:
Hangzhou Yanshan Chemical Co.,Ltd.
Contact:86-571- 87698076
Address:Room 1001, #1 Building, Zhongtian MCC, No.2 Youzhinong, Wenyi West Road, Xihu District, Hangzhou, China
SHENYANG COMEBOARD TECHNOLOGY CO., LTD
Contact:+86-24-25724626
Address:Room2210,Tianbao International Building,No.8-1 Weigong South Street,Tiexi District,Shenyang,China
Doi:10.1021/jp209596p
(2012)Doi:10.1055/s-1981-29493
(1981)Doi:10.1246/bcsj.64.1000
(1991)Doi:10.1016/j.jallcom.2007.11.029
(2008)Doi:10.1021/jacs.0c07014
(2020)Doi:10.1002/aoc.4308
(2018)