内分泌干扰物——双酚A的高效光催化降解研究
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摘要
内分泌干扰物,又称环境激素,主要是指可通过影响生物体和人类体内自身天然激素的合成、分泌、代谢等,从而破坏生物体和人类正常的代谢、分泌和生殖等功能的外源性化学物质。双酚A作为一种重要的有机化工原料,是一种普遍存在于环境中的内分泌干扰物,对生物体和人类有着极大的危害。
TiO2多相光催化技术因为安全、反应速率快、氧化彻底、能耗低、无二次污染等特点,而被应用于内分泌干扰物的处理。本研究着重从光催化反应器的角度,来建立一种高效处理双酚A的体系,设计出了一种新型的光源内置气-液-固循环流动的浆态光催化反应器。并通过光量子效率、能耗、反应速率等指标,对比研究了所设计的新型反应器与传统的气体提升式和环隙式浆态光催化反应器对偶氮染料降解脱氮的性能,研究发现新型反应器具有较优的综合性能。
采用自行制备的稀土钆掺杂的Gd-TiO2为光催化剂,在新设计的气-液-固浆态光催化反应器中对模拟内分泌干扰物废水——双酚A水溶液进行光催化降解研究。实验考查了催化剂浓度、表观气速、表观液速对降解速率的影响,处理体积为1800 ml,初始浓度为10 mg/L的内分泌干扰物废水最优处理条件为:催化剂浓度为6 g/L,表观气速为8.34×10-3 m/s,表观液速为1.11×10-2 m/s。在最优条件下处理120 min,双酚A降解率高达90%以上,符合处理要求。
本课题还进一步对比研究了Gd-TiO2和普遍商业化P25-TiO2光催化剂处理内分泌干扰物的性能。前者不论是在光催化效率方面还是沉降分离方面都明显优于后者。
本研究表明,Gd-TiO2光催化剂和气-液-固循环浆态光催化反应器是处理内分泌干扰物双酚A的高效体系,有着较好的应用前景。
Endocrine Disrupting Chemicals(EDCs), which is also called Environmental Hormone, is a kind of exogenous chemicals that can destroy normal metabolism,functions of exudation and procreation of organism and human being through disrupting the synthesis, exudation, and metabolism of nature hormone. As an important material of organic industry, Bisphenol A(BPA) exists widely in the environment, which is very harmful to organism and human being.
Titania heterogeneous photocatalysis oxidation technology has being used in the treatment of EDCs because of its safety, high reaction speed, complete oxidation, low energy consumption and no secondary contamination. In order to set up a highly efficient treatment system of BPA , a new gas-liquid-solid circulating slurry photocatalytic reactor(GLSCSPCR) has been designed in this paper.
Then a comprehensive performance evaluation of GLSCSPCR by comparing with common-used annular and air-lift slurry photocatalytic reactors though the degradation and nitrogen removal of an azo dye with respect to the apparent quantum yield of azo dye degradation, the rate and electrical energy consumption of nitrogen removal. The study shows that the newly designed GLSCSPCR behaves better.
Self-made rare earth doped photocatalyst Gd-TiO2 had been used in GLSCSPCR to treat simulated EDCs waste water——BPA aqueous solution. Effect of operation parameters such as catalyst concentration, superficial gas velocity and superficial liquid velocity to the photocatalytic degradation BPA has been studied. Results show when the volume is 1800 ml, BPA original concentration is 10 mg/L, the optimized operation parameters are 6 g/L, 8.34×10-3 m/s and 1.11×10-2 m/s. The photocatalytic degradation rate of BPA can reach more than 90% after 120 min degradation under optimized condition.
More over, comparative research of Gd-TiO2 and commercial photocatalyst P25-TiO2 has investigated in this paper, the former one is more excellent not only in photocatalytic efficiency but also the performance of sedimentation.
In conclusion, Gd-TiO2 photocatalyst and GLSCSPCR can be a high efficient treatment system of BPA, which shows good industrial application.
TiO2多相光催化技术因为安全、反应速率快、氧化彻底、能耗低、无二次污染等特点,而被应用于内分泌干扰物的处理。本研究着重从光催化反应器的角度,来建立一种高效处理双酚A的体系,设计出了一种新型的光源内置气-液-固循环流动的浆态光催化反应器。并通过光量子效率、能耗、反应速率等指标,对比研究了所设计的新型反应器与传统的气体提升式和环隙式浆态光催化反应器对偶氮染料降解脱氮的性能,研究发现新型反应器具有较优的综合性能。
采用自行制备的稀土钆掺杂的Gd-TiO2为光催化剂,在新设计的气-液-固浆态光催化反应器中对模拟内分泌干扰物废水——双酚A水溶液进行光催化降解研究。实验考查了催化剂浓度、表观气速、表观液速对降解速率的影响,处理体积为1800 ml,初始浓度为10 mg/L的内分泌干扰物废水最优处理条件为:催化剂浓度为6 g/L,表观气速为8.34×10-3 m/s,表观液速为1.11×10-2 m/s。在最优条件下处理120 min,双酚A降解率高达90%以上,符合处理要求。
本课题还进一步对比研究了Gd-TiO2和普遍商业化P25-TiO2光催化剂处理内分泌干扰物的性能。前者不论是在光催化效率方面还是沉降分离方面都明显优于后者。
本研究表明,Gd-TiO2光催化剂和气-液-固循环浆态光催化反应器是处理内分泌干扰物双酚A的高效体系,有着较好的应用前景。
Endocrine Disrupting Chemicals(EDCs), which is also called Environmental Hormone, is a kind of exogenous chemicals that can destroy normal metabolism,functions of exudation and procreation of organism and human being through disrupting the synthesis, exudation, and metabolism of nature hormone. As an important material of organic industry, Bisphenol A(BPA) exists widely in the environment, which is very harmful to organism and human being.
Titania heterogeneous photocatalysis oxidation technology has being used in the treatment of EDCs because of its safety, high reaction speed, complete oxidation, low energy consumption and no secondary contamination. In order to set up a highly efficient treatment system of BPA , a new gas-liquid-solid circulating slurry photocatalytic reactor(GLSCSPCR) has been designed in this paper.
Then a comprehensive performance evaluation of GLSCSPCR by comparing with common-used annular and air-lift slurry photocatalytic reactors though the degradation and nitrogen removal of an azo dye with respect to the apparent quantum yield of azo dye degradation, the rate and electrical energy consumption of nitrogen removal. The study shows that the newly designed GLSCSPCR behaves better.
Self-made rare earth doped photocatalyst Gd-TiO2 had been used in GLSCSPCR to treat simulated EDCs waste water——BPA aqueous solution. Effect of operation parameters such as catalyst concentration, superficial gas velocity and superficial liquid velocity to the photocatalytic degradation BPA has been studied. Results show when the volume is 1800 ml, BPA original concentration is 10 mg/L, the optimized operation parameters are 6 g/L, 8.34×10-3 m/s and 1.11×10-2 m/s. The photocatalytic degradation rate of BPA can reach more than 90% after 120 min degradation under optimized condition.
More over, comparative research of Gd-TiO2 and commercial photocatalyst P25-TiO2 has investigated in this paper, the former one is more excellent not only in photocatalytic efficiency but also the performance of sedimentation.
In conclusion, Gd-TiO2 photocatalyst and GLSCSPCR can be a high efficient treatment system of BPA, which shows good industrial application.
引文
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