A novel photooxidative system for degrading toxic organic pollutants, including organic dyes and small molecular compounds such as Rhodamine B (RhB) and 2,4-dichlorophenol (DCP), is reported. A metalorganic complex (β-cyclodextrin-hemin, CDH), synthesized by combining β-CD with the bioactive small molecule hemin, can efficiently activate hydrogen peroxide to oxidize and mineralize the target compounds in aqueous media at neutral pHs under ambient conditions of temperature and pressure and with visible light irradiation (λ > 450 nm). The RhB and DCP were mineralized at yields of 72% and 85% at ratios of catalyst to substrate of 1:200 and 1:1000, respectively. Meanwhile, the catalyst exhibited excellent stability. The photoreaction processes were examined by UV/vis spectroscopy, high-performance liquid chromatography, ion chromatography, IR, spin-trapping electron paramagnetic resonance, and total organic carbon measurements. A possible photooxidative mechanism for the degradation of organic pollutants in aqueous CDH/H2O2 solutions under visible light illumination is proposed on the basis of the experimental results.

An efficient method has been developed to degrade toxic and nonbiodegradable organic pollutants such as Sulforhodamine B (SRB) and 2,4-dichlorophenol (DCP). It is based on the photocatalytic power of iron tetrasulfophenylporphyrin supported on a commercial anionic ion-exchange resin (Amberlite IRA 900) (FePR) to activate an oxidant H2O2 in aqueous media. Visible light irradiation (λ> 450 nm) significantly accelerates the degradation process. The new catalyst is effective over a wide pH range, and can be easily recycled by filtration. The SRB and DCP were mineralized with yields of 56% and 68% at a catalyst/substrate molar ratio of 1:33 and 1:535, respectively. Moreover, the supported-catalyst would suppress greatly the undesirable side-reaction of H2O2 conversion to O2. UV-vis spectroscopy, high-performance liquid chromatography, ion chromatography, IR, spin-trapping electron paramagnetic resonance, surface photovoltage spectroscopy, and total organic carbon measurements were used to examine the photoreaction processes. The photocatalytic degradation pathways mainly involve the formation and reaction of âOH radicals. On the basis of the experimental results, a possible reaction mechanism is proposed.

Supported Fe ions on ion-exchange resin can be used to efficiently photodegrade organic pollutants in water with H2O2 at neutral pHs; this catalyst also significantly depresses the side-reaction of H2O2 conversion to O2.

A new photocatalytic system involving iron(II) bipyridinesupported on NaY zeolite (FeBY) shows excellent reactivityand selectivity in the oxidation of organic compounds. This approach allows highly controlled oxidation reaction to occur but avoids undesirable mineralization into CO2 and H2O.

Supported iron tetrasulfophthalocyanine can efficiently catalyze the degradation of organic pollutants by H2O2 under visible light irradiation in an aqueous solution, and the catalyst can be easily recycled without apparent loss of activity.

This article explores a supported catalyst of Fe(bpy)32+ on a cationic exchange resin (Amberlite IRA 200) as a photocatalyst for the degradation of organic pollutants by activating molecular oxygen under visible irradiation (λ > 420 nm) in water. Different from Fe(bpy)3 2+which is not photoactive in solution, the supported catalyst exhibits a very efficient photoactivity for the degradation of N,N dimethylaniline and the cationic dyes of Rhodamine B (RhB) and Malachite Green (MG) in an aerated aqueous medium. TOC removal yield was 75, 60 and 58%, respectively, after 700 min of visible light irradiation. The photocatalytic activity of the supported Fe(bpy)32+ remained unchanged after 22 cycles of over 100 h. The photocatalyst was characterized by UV-Vis diffuse reflectance, and X-ray photoelectron spectroscopies (XPS). EPR studies suggest that the active superoxide species {Fe(bpy)33+O2•−} are involved in the light-activated reaction. A reaction mechanismis proposed in the text.

This article explores a supported catalyst of Fe(bpy)32+ on a cationic exchange resin (Amberlite IRA 200) as a photocatalyst for thedegradation of organic pollutants by activating molecular oxygen under visible irradiation 420 nm) in water. Different from Fe (bpy) 3 2+which is not photoactive in solution, the supported catalyst exhibits a very efficient photoactivity for the degradation of N,N-dimethylanilineand the cationic dyes of Rhodamine B (RhB) and Malachite Green (MG) in an aerated aqueous medium. TOC removal yield was 75, 60 and5 8%, re spectively, after 700 min of visible light irradiation. The photocatalytic activity of the supported Fe(bpy)3 2+ remained unchanged after 22 cycles of over 100 h. The photocatalyst was characterized by UV-Vis diffuse reflectance, and X-ray photoelectron spectroscopies (XPS). EPR studies suggest that the active superoxide species {Fe(bpy)33+02'-} are involved in the light-activated reaction. A reaction mechanism is proposed in the text

研究了反相胶束介质丁二酸双（2-乙基己基）酯磺酸钠（AOT）/正辛烷（n-octane）对漆酶催化氧化邻苯二胺的产物2，3二氨基吩嗪（DAP）光谱性质的影响．试验表明．AOT/n-oc tane对DAP吸光性质稍有增敏作用，而对其荧光具有强烈的增敏作用，使DAP荧光量子产率提高近30倍，并进一步研究了微环境对荧光性质的影响和反相胶束介质AOT/n-oetane对DAP荧光的增敏机理

生物转化是化学和生物学交叉研究领域，包括生物催化剂（酶）工程和反应介质工程两大要素。一方面，开发性能优良的模拟酶，能模拟天然酶在生物体内的高催化活性（酶模拟)；另一方面，介质工程可以用体外的方法模拟酶在生物体内细胞膜的微环境（膜模拟），对用体外的方法研究生物体内催化信息，探讨生物体系的生命现象具有重要的意义。

在反相胶束（AOT/n-octane）介质中，漆酶(laccase)-邻苯二胺（o-phenylenediamine, OPDA）体系的酶催化反应呈现“超级活性”，并且酶催化反应中间体与产物2,3-二氨基吩嗪（2, 3-diaminophenazine, DAP）的吸收光谱能很好的剥离分开。通过理论推导，表明酶催化反应中间体生成的初始速率与漆酶活性存在定量关系，采用初始速率法测定中间体的浓度，建立了一种基于检测酶催化反应中间体而测定漆酶活性的动力学分析新方法。该方法由于在反相胶束介质中采用初始速率法进行测定，具有较高的灵敏度和选择性。测定漆酶活性的线性范围为0-2.5U；检出限为0.033U。