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Quinone -based ceramic enhanced anaerobic reduction of azo dyes and nitro compounds
Author: YuanShouZhi
Tutor: ZhouJiTi
School: Dalian University of Technology
Course: Environmental Engineering
Keywords: Redox mediator Azo dyes Nitro compounds Bioreduction Chemical reduction
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 61
Quote: 1
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Abstract
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Purpose of this thesis is to develop a high mechanical strength, wide range of applications, inexpensive new immobilized redox mediator and applied azo dyes and nitro aromatic compounds anaerobic process. Immobilization of this new form of the redox mediator as an inorganic ceramic carrier, through a series of physical and chemical methods anthraquinone-2 - sulfonic acid (AQS) fixed to the ceramic surface. Using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) of the ceramic prepared by the quinone analyzes were characterized. In addition, a detailed examination of such quinone ceramic nitro aromatic compounds of azo dyes and anaerobic catalytic reduction process strengthening effect, while the quinone-based ceramic catalytic reduction process enhanced chemical dyes were studied. Experimental results show that if 3 - aminopropyl triethoxysilane (APTES) dosage of 4.73 g, silanization reaction time was 3 h, anthraquinone-2 - sulfonyl chloride (ASC) dosage of 0.1 g, reaction time was fixed at 8 h, AQS has better immobilization. FTIR results show that, AQS is effectively fixed to the ceramic surface; Meanwhile, SEM results showed that the quinone remain porous ceramic structure, AQS immobilization of a biological carrier does not affect its function. By elemental analyzer, then ceramic surface AQS content of about 2.3μmol / g. In the spring of Liuhe secondary clarifier sludge bacteria source, a kind of salt enrichment domesticated flora quinone reduction for subsequent biological reduction experiments, and this salt reduction AQS quinone reduction flora characteristics were studied. Experimental results show that the sodium salt of quinone reduction flora electron donor, the concentration of 3 g / L, pH value of 7, NaCl concentration of 50 g / L, the better the effect of the reduction with AQS. Experimental results show that the biological reduction, quinone-based ceramic is added to a certain extent, improve the azo dyes and nitro aromatic compounds anaerobic biological reduction rate. Quinone-based ceramic added, Azo Golden G (Acid yellow 36), reactive red X-3B (Reactive Red 2), Amaranth (Acid red 27), Acid Orange 7 (Acid orange 7) decolorization rate increased 1.9-5.6 times, nitrobenzene, chloro nitrobenzene, nitrotoluene reduction rate increased 0.3-0.9 times. With increasing concentration of immobilized AQS acidic golden G decolorization rate and increase biological. Quinone-based ceramic recycled three times in acidic golden G decolorization was still able to reach 98%, indicating that it has a catalytic enhanced stability. Meanwhile, Biolog results show quinone ceramic with good biocompatibility. Golden G Na2S restore optimum acidic conditions: Na2S concentration of 3.2 mmol / L, pH = 6.0. In optimal conditions, the quinone-based ceramic joining can greatly improve anaerobic chemical reduction of azo dyes decolorization rate. Using a kinetic equation for the chemical reduction process to fit. Compared with Na2S reduction process alone, quinone-based ceramic joining can make acidic Golden G, reactive red X-3B, Amaranth, Acid Orange 7 first-order kinetic constants increased 2.9-9.9 times, and with the immobilized AQS concentration, acidity golden yellow G decolorization rate and increase the chemical.
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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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