Journal
CHEMICAL ENGINEERING JOURNAL
Volume 339, Issue -, Pages 359-368Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.01.139
Keywords
Adsorption; p-Arsanilic acid; NH2-MIL-68(In); Hydrogen bonding
Categories
Funding
- Open Foundation of the Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants [PY16001, PY17001]
- Foundation of the Key Laboratory of Pulp and Paper Science and Technology of the Ministry of Education/Shandong Province of China [KF201618]
- Fuzhou University Valuable Instruments Open Fund [2017T014]
- National Basic Research Program of China (973 Program) [2014CB846003]
- National Natural Science Foundation of China [41372346, 21577018]
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Organoarsenic compounds are emerging contaminants because of their considerable solubilities in water and the highly toxic inorganic arsenic species formed during their biotic and abiotic degradation in the natural environment. Herein, the adsorption of p-arsanilic acid (p-ASA), a typical organoarsenic compound, was studied by employing an amino-functionalized indium-based metal-organic framework (NH2-MIL-68(In)) and pristine MIL-68(In). Adsorption batch experiments reveal that NH2-MIL-68(In) has a higher adsorption capacity (401.6 mg g(-1)), affinity (0.0552 L mg(-1)), and adsorption rate (5.79x10(-4)g mg(-1) min(-1)) toward p-ASA than those of pristine MIL-68(In). Moreover, the adsorption of p-ASA was spontaneous and exothermic, and obeyed a pseudo-second-order model with intraparticle diffusion. The adsorption mechanism is proposed to involve synergism between pi-pi stacking and hydrogen-bonding interactions. The NH2 moiety introduced into the MIL68(In) greatly improves its adsorption performance by enhancing hydrogen bonding. This study provides an important theoretical and experimental basis for the application of MOFs to the removal of organoarsenic compounds such as p-ASA.
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