Guangming Liu

Publications (2)6.28 Total impact

• Article: Fe(III)-oxalate complexes mediated photolysis of aqueous alkylphenol ethoxylates under simulated sunlight conditions.

  Guangming Liu, Shourong Zheng, Xiaoli Xing, Yifan Li, Daqiang Yin, Yongsheng Ding, Weihai Pang
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  ABSTRACT: Photolysis of octylphenol ethoxylates Triton X-100 (TX) in water under simulated sunlight conditions was investigated in the presence of Fe(III)-oxalate complexes. The results showed that Fe(III)-oxalate complexes mediated TX degradation followed the first-order kinetics and the photolysis efficiency was dependent on the pH, Fe(III) concentration, Fe(III)/oxalate ratio and initial TX concentration. The active oxygen species generated by photolysis of Fe(III)-oxalate complexes were monitored by electron paramagnetic resonance (EPR) method using 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) as the spin-trapping reagent. The steady-state concentration of OH radicals was 8.33x10(-14)M and the rate constant of TX reaction with OH radical was 1.29x10(9)M(-1)s(-1) under our experimental conditions. The degradation products were analyzed by the high-performance liquid chromatography-electrospray ionisation-mass spectrometry and the degradation mechanisms of TX in the presence of Fe(III)-oxalate complexes was proposed. The OH radical can react with the alkyl chain, ethoxy (EO) chain and the aromatic ring of TX molecule during TX photolysis process. The main degradation pathway of TX involves the OH radical addition to the aromatic ring and the cleavage of the alkyl chain followed by combination with OH radical. The OH radical also attacks the polyethoxylated chain to generate short polyethoxylated chains or formyl ethoxylates.
  Chemosphere 11/2009; 78(4):402-8. · 3.21 Impact Factor
• Article: Adsorption of aqueous alkylphenol ethoxylate surfactants by mesoporous carbon CMK-3.

  Guangming Liu, Shourong Zheng, Daqiang Yin, Zhaoyi Xu, Jie Fan, Fang Jiang
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  ABSTRACT: Mesoporous carbon, CMK-3, was prepared using hexagonal SBA-15 mesoporous silica as the template and the adsorption of nonylphenol ethoxylates (NPE) onto CMK-3 was investigated. The adsorption process was well described using pseudo-second-order kinetics. At initial NPE concentrations of 107 and 530 mg l(-1), the adsorption rate constants were found to be 5.6 x 10(-3) and 8.7 x 10(-4) g mg(-1) min(-1), indicating that a higher initial concentration or adsorption amount resulted in a lower adsorption rate. NPE adsorption onto CMK-3 fitted a Langmuir-Freundlich model and the maximum amounts of NPE absorbed at 15, 25, and 35 degrees C were 923, 720, and 463 mg g(-1), suggesting an elevated adsorption capacity of CMK-3 for NPE with decreased adsorption temperature. In addition, increasing adsorption temperature led to the change of the adsorption model from the Langmuir-Freundlich to the Langmuir model. N2 adsorption results showed that the adsorption of NPE led to a decrease in the mesopore volume of CMK-3. However, the pore width of NPE-loaded CMK-3 was found to be identical to that of CMK-3.
  Journal of Colloid and Interface Science 11/2006; 302(1):47-53. · 3.07 Impact Factor