pH和温度对PDA在罗丹明B染料还原中催化性能的影响
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摘要
多巴胺在碱性溶液中发生氧化自聚得到聚多巴胺(PDA),PDA颗粒表面的强粘附性和所含活性官能团使其在多功能复合材料的制备中具有广泛应用。利用PDA的弱还原性和粘附性可原位制备纳米金颗粒,并使得其负载于PDA表面得到PDA@Au复合颗粒;通过对比不同溶液pH及不同反应温度条件下PDA和PDA@Au催化性能的差异发现,两者均可催化罗丹明B的降解反应,但PDA@Au的催化效率远高于PDA,且其催化活性基本不受溶液pH的影响。为简单、高效、普适的催化剂体系的制备提供了新思路。
Dopamine(DA) can be oxidized and self-polymerized to form polydopamine(PDA) under alkaline conditions.The strong adhesion and active functional groups on the surface of PDA particles make them widely used in the preparation of multifunctional composites. PDA @ Au composite particles can be gained through loading gold nanoparticles,which is made by in-situ method,on the surface of PDA by means of weak reduction and adhesion of PDA.Both PDA particles and PDA@ Au composite particles are used to catalyze the reduction of Rhodamine B in the presence of Na BH4.It is found through comparing their catalytic performances under different p H values and different temperature that PDA@ Au particles exhibit more excellent performance. Additionally,the excellent catalytic performance of PDA@Au composite particles is not affected by p H value of the solution.This method provides a new idea for the preparation of simple,efficient and universal catalyst system.
Dopamine(DA) can be oxidized and self-polymerized to form polydopamine(PDA) under alkaline conditions.The strong adhesion and active functional groups on the surface of PDA particles make them widely used in the preparation of multifunctional composites. PDA @ Au composite particles can be gained through loading gold nanoparticles,which is made by in-situ method,on the surface of PDA by means of weak reduction and adhesion of PDA.Both PDA particles and PDA@ Au composite particles are used to catalyze the reduction of Rhodamine B in the presence of Na BH4.It is found through comparing their catalytic performances under different p H values and different temperature that PDA@ Au particles exhibit more excellent performance. Additionally,the excellent catalytic performance of PDA@Au composite particles is not affected by p H value of the solution.This method provides a new idea for the preparation of simple,efficient and universal catalyst system.
引文
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[3]孙剑辉,祁巧艳,杨明耀.纳米Ti O2/AC光催化降解罗丹明B废水的研究[J].工业水处理,2005,25(6):37-39.
[4]施超,冯景伟,彭书传,等.活性炭纤维对水中罗丹明B的吸附性能[J].环境化学,2013,(3):394-401.
[5]Hvolbk B,Janssens T V W,Clausen B S,et al.Catalytic activity of Au nanoparticles[J].Nano Today,2007,2(4):14-18.
[6]Thompson D T.Using gold nanoparticles for catalysis[J].Nano Today,2007,2(4):40-43.
[7]Schimpf S,Lucas M,Mohr C,et al.Supported gold nanoparticles:In-depth catalyst characterization and application in hydrogenation and oxidation reactions[J].Catalysis Today,2002,72(1):63-78.
[8]张杨子,祝琳华,何艳萍,等.纳米金催化剂Au/ZnAl-LDHs的制备及在CO常温氧化反应中的活性及稳定性[J].材料导报,2015,29(2):10-14.
[9]唐月,胡红定,朱明乔,等.活性炭负载的纳米金催化剂上葡萄糖氧化工艺[J].化学反应工程与工艺,2012,28(3):200-205.
[10]Menuel S,Léger B,Addad A,et al.Cyclodextrins as effective additives in AuNPs-catalyzed reduction of nitrobenzene derivatives in a ball-mill[J].Green Chemistry,2016,18(20):5500-5509.
[11]Ye Y,Jin M,Wan D. One-pot synthesis of porous monolithsupported gold nanoparticles as an effective recyclable catalyst[J].Journal of Materials Chemistry A,2015,3(25):13519-13525.
[12]Zhao P,Feng X,Huang D,et al.Basic concepts and recent advances in nitrophenol reduction by gold-and other transition metal nanoparticles[J].Coordination Chemistry Reviews,2015,287(10):114-136.
[13]Guo L,Liu Q,Li G,et al.A mussel-inspired polydopamine coating as a versatile platform for the in situ synthesis of graphene-based nanocomposites[J].Nanoscale,2012,4(19):5864-5867.
[14]李丽,季伟捷,区泽棠.介孔SiO2负载的纳米金及其催化应用[J].化学进展,2009,21(9):1742-1749.
[15]韩丹,张爱文,高官俊,等.负载型纳米Au催化剂光催化性能的研究进展[J].化工进展,2012,31(2):435-440.
[16]Liu Y,Ai K,Lu L.Polydopamine and its derivative materials:Synthesis and promising applications in energy,environmental,and biomedical fields[J].Chemical Reviews,2014,114(9):5057-5115.
[17]Lynge M E,Van d W R,Postma A,et al. Polydopamine———a nature-inspired polymer coating for biomedical science[J].Nanoscale,2011,3(12):4916-4928.
[18]Zeng T,Zhang X L,Niu H Y,et al.In situ,growth of gold nanoparticles onto polydopamine-encapsulated magnetic microspheres for catalytic reduction of nitrobenzene[J]. Applied Catalysis B Environmental,2013,s134-135(9):26-33.
[19]Mao Y,Jiang W,Xuan S,et al. Rod-likeβ-Fe OOH@poly(dopamine)-Au-poly(dopamine)nanocatalysts with improved recyclable activities[J].Dalton Trans,2015,44(20):9538-9544.
[20]Arbeloa F L,Arbeloa T L,Estevez M J T,et al.Photophysics of rhodamines:Molecular structure and solvent effects[J]. Journal of Physical Chemistry,1991,95(6):2203-2208.
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