Journal
ENVIRONMENTAL SCIENCE-NANO
Volume 8, Issue 12, Pages 3792-3805Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1en00853f
Keywords
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Funding
- National Natural Science Foundation of China [21962006, 21707055, 21607064]
- Youth Key Project of Nature Science Foundation of Jiangxi Province [20192ACBL20014, 20192ACBL21011]
- Natural Science Foundation of Jiangxi Province [20181BAB203018, 20181BAB213010]
- Jiangxi Provincial Academic and Technical Leaders Training Program - Young Talents [20204BCJL23037]
- Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology [JXUSTQJYX20170005]
- University of Cincinnati through the Herman Schneider Professorship in the College of Engineering and Applied Sciences
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In this study, novel mesoporous adsorbents were successfully synthesized for efficient removal of phosphate and Congo red from dye-containing wastewater. The adsorbents showed great potential for practical use due to excellent simultaneous P and CR removal, along with good reusability. This work provides new insights into simultaneous P and CR remediation from wastewater by designing porous functional materials.
The simultaneous elimination of phosphorus and dyes is of great significance for the practical treatment of dye-containing wastewater. In this study, a series of novel mesoporous adsorbents were successfully fabricated via the controlled linking of polyethyleneimine (PEI) to 3D dendritic mesoporous silica (DMS), followed by in situ formation of La(OH)(3) through coordination between N-containing functional groups and La3+. The synthesis of such adsorbents with different amounts of PEI and La(OH)(3) was optimized towards efficient removal of phosphate (P) and Congo red (CR) with a maximum adsorption capacity of 58.1 mg P g(-1) and 926.4 mg g(-1), respectively. The optimal adsorbent (DMS-PEI-La2) exhibited excellent simultaneous P and CR removal in a binary-component (P and CR) solution, in which CR adsorption was promoted by the increase of coexisting P concentration. Taken the effects of initial solution pH into consideration, the adsorption mechanisms of P involved electrostatic attraction, hydrogen bonding and ligand exchange. It is noted that LaPO4 nanodots and nanorods confined in the mesoporous structure were formed via ligand exchange of -OH from La(OH)(3) with P. Meanwhile, the formed LaPO4 would further act as new active sites for accelerating CR adsorption by hydrogen bonding. In addition, efficient simultaneous removal of P and CR using DMS-PEI-La2 in simulated polluted river water was observed, along with negligible La leaching. The selected adsorbent showed good reusability in four successive cycles of adsorption-desorption, indicating the great potential for practical use in the treatment of dye-containing wastewater. Thus, this work provides a new insight on simultaneous P and CR remediation from wastewater by rationally designing novel porous functional materials.
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