Formation of shaped barium sulfate-dye hybrids: waste dye utilization for eco-friendly treatment of wastewater.
OBJECTIVE
Owing to the present complexity and difficulty of concentrated dye wastewater treatment, this work aimed to synthesize a reproducible waste-sorbing material for the treatment of wastewater by forming the dye-conjugating complex hybrid.


METHODS
The inorganic/organic hybridization was applied to prepare the objective material by immobilizing waster dye-Mordant blue 9 (MB) with barium sulfate (BaSO4). The composition and pattern of the formed material were determined by spectrometry and characterized by SEM and XRD, and their formation process was clarified. The adsorption of cationic dye-basic blue BO (BB) and copper ion was investigated.


RESULTS
The hybrid of MB alone into growing BaSO4 formed the pineapple-like particles while that of the MB/BB-conjugating complex was the rhombus material. The adsorption of BB on the MB-BaSO4 hybrid was probably attributed to ion-pair equilibrium and that of Cu2+ may result from the complexation. The treatment of dye and heavy metal wastewaters indicated that the MB hybrid material removed 99.8% BB and 97% Cu2+ and the dye-conjugating hybrid with growing BaSO4 100% MB, 99.5% BB, and 44% Cu2+.


CONCLUSIONS
The waste MB-BaSO4 hybrid material is efficient to treat cationic dye and Cu2+ wastewater. The dye-conjugating hybridization method is the first to be advanced for in situ wastewater treatment, and it showed a combined effect for the removal of both organic dyes and heavy metals.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China. hwgao@tongji.edu.cn
Hong-Wen
HW
Gao
Jing
J
Lin
Wei-Ying
WY
Li
Zhang-Jun
ZJ
Hu
Ya-Lei
YL
Zhang
D000327:Adsorption; D001466:Barium Sulfate / Q000737:chemistry*; D002413:Cations, Divalent; D004396:Coloring Agents / Q000737:chemistry*; D003300:Copper / Q000737:chemistry; D007220:Industrial Waste; D019216:Metals, Heavy / Q000737:chemistry; D009942:Organometallic Compounds / Q000138:chemical synthesis*; D014865:Waste Disposal, Fluid / Q000191:economics / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification; D014877:Water Pollution, Chemical / Q000517:prevention & control*
D002413:Cations, Divalent; D004396:Coloring Agents; D007220:Industrial Waste; D019216:Metals, Heavy; D009942:Organometallic Compounds; D014874:Water Pollutants, Chemical; D001466:Barium Sulfate; D003300:Copper