The influence of ZSM-5 structure on As(V) adsorption performance: pseudomorphic transformation and grafting of rare-eart
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The influence of ZSM-5 structure on As(V) adsorption performance: pseudomorphic transformation and grafting of rare-earth Ce onto ZSM-5 Xize Min1, Chundi Zhou1, Caiyun Han1,*
1
, Jie Tang1, Dekun Liu1, and Yongming Luo1
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, People’s Republic of China
Received: 20 December 2019
ABSTRACT
Accepted: 19 March 2020
ZSM-5 has been regarded as one of the potential materials for separating substances from the mixture; however, their micropore channel is not favorable to load new active sites and adsorbate species. Herein, the pseudomorphic transformation method was used to convert high-aluminum-content micropore ZSM5 into mesoporous structure (ZSM-5K). The samples of ZSM-5 and ZSM-5K were modified by Ce2(SO4)3 via the same impregnation route, and the obtained samples were used to adsorb As(V) from aqueous solution. The As(V) removal percentage and the X-ray diffraction data indicate that Ce2(SO4)3 was the effective adsorption site due to the high affinity between As(V) species and Ce. The N2 adsorption–desorption isotherms show that the linear connection between As(V) removal and BET surface of adsorbents was been obtained. The transmission electron microscopy results showed that mesoporous structure was more favorable to disperse the adsorption sites. In addition, the As(V) equilibrium adsorption data were fitted well by the Langmuir isotherm, and the maximum adsorption capacity was found as 31.63 mg/g, which was larger than that of the conventional alumina, carbon, iron oxide, etc. The adsorption kinetics under different initial concentration obeyed the pseudosecond-order model.
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Introduction The separation of heavy metals is one of the most important tasks, and ever-lasting attention has been focused on the area of environmental protection,
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https://doi.org/10.1007/s10853-020-04591-w
because of the large-scale runs of natural weathering reactions, mining, pigments, combustion of fossil fuels, and so on [1, 2]. Arsenic, one of the metalloid elements, has been listed as carcinogens by the International Agency for Research on Cancer [3, 4]. In addition, high level of arsenic in water has been
J Mater Sci
reported in many nations such as Mexico, Taiwan, China, and the USA [3]. It can enter the human body via exposure to arsenic-containing water and directly affect people with health problems such as keratosis, lung cancer, kidney cancer, and muscular weakness [5]. The permissible maximum level of arsenic in drinking water is 10 lg/L, and it has been regulated by the Word Health Organization (WHO) [6]. Therefore, finding an effective technology to eliminate arsenic from water is very important. Adsorption has been regarded as one of the effective methods to remove arsenic from aqueous solution. Extensive materials such as alumina, synthetic resin, carbon, zeolite, mixed rare-earth oxide
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