Open Access2D‐Fe 3 O 4 Nanosheets for Effective Arsenic Removal
Author(s) -
Luo Hongxi,
Cheng Fangwei,
Hu Weiming,
Wang Jinpeng,
Xiang Shuting,
Fidalgo de Cortalezzi Maria
Publication year - 2017
Publication title -
journal of contemporary water research and education
Language(s) - English
Resource type - Journals
eISSN - 1936-704X
pISSN - 1936-7031
DOI - 10.1111/j.1936-704x.2017.03245.x
Subject(s) - adsorption , zeta potential , arsenic , freundlich equation , particle size , chemistry , particle (ecology) , nuclear chemistry , water treatment , inorganic chemistry , materials science , chemical engineering , environmental engineering , nanotechnology , nanoparticle , organic chemistry , oceanography , geology , engineering
Fe 3 O 4 adsorbent with 2D structures was synthesized via solvothermal method and its application in arsenic removal was investigated. Isotherms were generated at pH=4.7 and 7.6 and the results were best fitted by the Freundlich isotherm model; good As(V) adsorption capacity was achieved for the Fe 3 O 4 adsorbent at both pH values. Furthermore, pH effects were evaluated; the optimal pH value for adsorption was 8.27 with the adsorption capacity and the removal efficiency being 18.55 mg/g and 93.69%, respectively. Based on the measurements of the zeta potential and particle size of the adsorbent, we proposed that the overall pH dependence was a result of the combined effects of the zeta potential, particle size of the adsorbent, and existing form of As(V). From kinetics studies, the As(V) adsorption by Fe 3 O 4 adsorbent followed the pseudo‐second‐order model and could be described by a two stage mechanism. When initial As(V) concentration was 1 ppm, 73% of the As(V) was adsorbed within the first 2.5 minutes and an overall removal efficiency of 82.5% was achieved in 2 hours. Increased removal efficiency is expected at higher adsorbent loading, thus allowing the post‐treatment water to meet drinking water quality standards.