Preparation of dye waste-barium sulfate hybrid adsorbent and application in organic wastewater treatment.
A new hybrid material was developed by the template-free hybridization of weak acidic pink red B (APRB, C.I. 18073) with BaSO(4). The composition and structure of the material were determined and characterized. In contrast to conventional sorbents, the hybrid material has a specific surface area of 0.89 m(2)/g, but it contains lots of negative charges and lipophilic groups as the basis of specific adsorption. The efficient removal of cationic dyes and persistent organic pollutants (POPs) indicates that it has an improved adsorption capacity and selectivity with a short removal time less than 2 min; while the hybrid sorbents fit the Langmuir isotherm model, and follow the octanol-water partition law. Instead of using APRB reagent, an APRB-producing wastewater was reused to prepare the cost-effective sorbent, and the equilibrium adsorption capacities of which reached 222 and 160 mg/g for EV and BPR, respectively. The sorbents was then used to treat three wastewater samples with satisfactory results of over 97% decolonization and 88% COD-decreasing. In addition, the hybrid sorbent was regenerated from sludge over five cycles, and its adsorption capacity was not appreciably changed. This work has developed a simple and eco-friendly method for synthesizing a practical and efficient sorbent.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Siping Rd 1239, Shanghai 200092, PR China.
Zhang-Jun
ZJ
Hu
Yan
Y
Xiao
Dan-Hua
DH
Zhao
Yu-Lin
YL
Shen
Hong-Wen
HW
Gao
D000143:Acids / Q000737:chemistry; D000327:Adsorption; D001466:Barium Sulfate / Q000737:chemistry*; D002412:Cations; D004396:Coloring Agents / Q000737:chemistry* / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007700:Kinetics; D008855:Microscopy, Electron, Scanning / Q000379:methods; D009930:Organic Chemicals; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*
D000143:Acids; D002412:Cations; D004396:Coloring Agents; D007220:Industrial Waste; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D001466:Barium Sulfate