Journal
LANGMUIR
Volume 27, Issue 22, Pages 13729-13738Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la203162y
Keywords
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Funding
- Key Project for Water Pollution Control and Management Technology of China [2009ZX07212-001-01]
- National Science Foundation [50925417]
- Key Project for National Natural Science of China [50830301]
- Public Welfare Project for Ministry of Environmental Protection of China [2011467062]
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A method of pH manipulation has been used to improve chemically oxidative polymerization of m-phenylenediamine (mPD) through concurrent addition of NaOH when adding oxidant (NH4)(2)S2O8. pH detection and open-circuit potential technique were adopted to monitor the polymerization process of mPD and to explain the oxidation state-pH and yield-pH relationships. Results from Fourier transformed infrared (FTIR) and X-ray photoelectron (XPS) spectroscopies indicate that a low oxidation state is under control by regulating NaOH concentration. At 2.5 M NaOH, the oxidation state of poly(m-phenylenediamine) (PmPD) is 64.7 mol % (measured by molar content of quinoid imine from XPS), while the yield is 84%. The synthesized PmPD possesses better Ag+ adsorption performance when lowering its oxidation state. Moreover, the Ag+ adsorbance of PmPD can reach 1693 mg g(-1). Meanwhile, Ag+ adsorption mechanism was studied by pH tracking, X-ray diffraction (XRD) patterns, and X-ray photoelectron spectroscopy. The adsorption process includes redox reaction, chelation, and physical adsorption.
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