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Homogenous Oxidizing Oligomerization Coupled with Coagulation for Water Purification.
Lei Cui1, Yingxu Gong1, Shengxin Zhao1
1State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
Water Research
|May 9, 2024
Summary
Natural manganese oxides and periodate (PI) were used to remove phenolic contaminants from water. This novel process transforms, converges, and separates pollutants via oxidizing oligomerization, offering efficient, low-carbon water purification.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
- Advanced Oxidation Processes
Background:
- Natural manganese oxides drive humification by coupling small organic molecules in water.
- Simulating these natural processes can lead to advanced oxidation technologies for water purification.
- Phenolic contaminants pose environmental risks and require efficient removal methods.
Purpose of the Study:
- To develop a novel water purification method using colloidal manganese oxides (Mn(IV)aq) and periodate (PI) to remove phenolic contaminants.
- To investigate the mechanism of oxidizing oligomerization and subsequent coagulation for contaminant removal.
- To evaluate the efficiency and sustainability of the proposed cascade process.
Main Methods:
- Utilized colloidal manganese oxides (Mn(IV)aq) and periodate (PI) as the primary reactants.
- Introduced polyferric sulfate (PFS) to induce a post-coagulation process for soluble manganese removal.
- Analyzed the formation of Mn(IV)-PI* complexes and their role in the cross-coupling of phenolic contaminants.
Main Results:
- A Mn(IV)aq/PI system with PFS effectively removed phenolic contaminants through oxidizing oligomerization and coagulation.
- Phenolic contaminants were transformed into oligomerized products (dimers to hexamers) that were captured in flocs.
- Residual periodate and soluble manganese were efficiently removed from the aqueous phase via coagulation.
- The process achieved high oxidant utilization efficiency under mild, homogeneous conditions without external energy or heterogeneous catalysts.
Conclusions:
- The developed cascade process enables the transformation, convergence, and separation of phenolic contaminants.
- This method offers a low-carbon, efficient alternative to traditional mineralization-driven oxidation techniques for water purification.
- The study demonstrates a novel approach to advanced oxidation by mimicking natural humification processes.
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