Mesoporous Magnesium Oxide Hollow Spheres as Superior Arsenite Adsorbent: Synthesis and Adsorption Behavior.
Arsenic contamination in natural water has posed a significant threat to global health due to its toxicity and carcinogenity. Adsorption technology is an easy and flexible method for arsenic removal with high efficiency. In this Article, we demonstrated the synthesis of mesoporous MgO hollow spheres (MgO-HS) and their application as high performance arsenite (As(III)) adsorbent. MgO-HS with uniform particle size (∼180 nm), high specific surface area (175 m(2) g(-1)), and distinguished mesopores (9.5 nm in size) have been prepared by hard-templating approach using mesoporous hollow carbon spheres as templates. An ultrahigh maximum As(III) adsorption capacity (Qmax) of 892 mg g(-1) was achieved in batch As(III) removal study. Adsorption kinetic study demonstrated that MgO-HS could enable As(III) adsorption 6 times faster as a commercial MgO adsorbent. The ultrahigh adsorption capacity and faster adsorption kinetics were attributed to the unique structure and morphology of MgO-HS that enabled fast transformation into a flower-like porous structure composed of ultrathin Mg(OH)2 nanosheets. This in situ formed structure provided abundant and highly accessible hydroxyl groups, which enhanced the adsorption performance toward As(III). The outstanding As(III) removal capability of MgO-HS showed their great promise as highly efficient adsorbents for As(III) sequestration from contaminated water.
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , Brisbane, QLD 4072, Australia.|The Agency for Assessment and Application of Technology (BPPT), Indonesian Ministry of Research, Technology and Higher Education , Jl. M.H. Thamrin No.8, Jakarta 10340, Indonesia.
Swasmi
S
Purwajanti
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , Brisbane, QLD 4072, Australia.
Hongwei
H
Zhang
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , Brisbane, QLD 4072, Australia.
Xiaodan
X
Huang
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , Brisbane, QLD 4072, Australia.
Hao
H
Song
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , Brisbane, QLD 4072, Australia.
Yannan
Y
Yang
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , Brisbane, QLD 4072, Australia.
Jun
J
Zhang
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , Brisbane, QLD 4072, Australia.
Yuting
Y
Niu
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , Brisbane, QLD 4072, Australia.
Anand Kumar
AK
Meka
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , Brisbane, QLD 4072, Australia.
Owen
O
Noonan
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , Brisbane, QLD 4072, Australia.
Chengzhong
C
Yu
adsorption; arsenic removal; hollow structure; magnesium oxide; mesoporous