Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 400, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123045
Keywords
Layered double hydroxide based solid hydrogen peroxide; Heterogeneous Fenton; Oxidation; Adsorption; Arsenite
Categories
Funding
- National Natural Science Foundation of China [51608412]
- Natural Science Basic Research Plan in Shaanxi Province of China [2019JQ-428]
- Young Talent fund of University Association for Science and Technology in Shaanxi, China [20190607]
- Special Fund Project of Education Department in Shaanxi Province of China [19JK0409]
- Chongqing Key Laboratory of Environmental Materials and Remediation Technology (Chongqing University of Arts and Sciences) [CEK1804]
- Scientific Research Fund of Shaanxi University of Science and Technology [2016BJ-48]
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The improvement of oxidant can enhance the efficiency and enlarge the application range of Fenton process a lot. Herein, a high efficient layered double hydroxide (LDH) based solid hydrogen peroxide (LDHSHP) was designed, synthesized, and occupied as oxidant/adsorbent for the treatment of Arsenite (As(III)) in wastewaters. In LDHSHP, hydrogen peroxide was introduced in and connected to CO32- interlayered, and the LDHSHP/Fe2+ system performed excellent in the range of pH 2.6-10.6. Hydroxyl radicals (center dot OH) played the main role in the oxidation of As(III), and the surface area of MgAl-LDH derived from LDHSHP was enlarged to about twice of that of LDHSHP. The increased surface area effectively promoted the adsorption of As(V). Almost 100 % of the obtained As(V) in water was immediately adsorptive removed. The adsorption capacity of LDHSHP derived MgAl-LDH for As(V) was detected to be 484.548 mg/g, and the adsorption fit the Langmuir model well and kinetic data was best described by the pseudo-second order model. The adsorption process was endothermic in the range of 298-308 K, while exothermic between 308 and 318 K. As(V) was calculated to be chemisorbed and reaction mechanism was proposed. LDHSHP is promising in the treatment of heavy metal-containing wastewaters.
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