Search query: “Photocatalytic” and “Visible light” and“(BiO)2CO3”

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abstract: Abstract The wide band gap semiconductor (BiO)2CO3 was modified by interior doping with I ions and surface loading with BiOI to prepare a highly efficient visible light active photocatalyst for the degradation of methyl orange and phenol. The interior I ions elevate the valence band position of (BiO)2CO3 and induce visible light photocatalytic activity, while the in situ formed BiOI/I (BiO)2CO3 heterojunction significantly improves the separation of photoinduced charge carriers. By the action of the reactive species h+ and O2 methyl orange and phenol were degraded over the novel BiOI/I (BiO)2CO3 composite at rates that were 18 and 4 times, respectively, those of unmodified (BiO)2CO3. Thus, the findings presented here may be widely applied in the development of wide band gap semiconductor photocatalytic systems for the highly efficient removal of contaminants from wastewater.
author_names: Lei Liang

Jing Cao

Haili Lin

Xiaomin Guo

Meiyu Zhang

Shifu Chen
title: Synergetic effects of I ions and BiOI on visible light activity enhancement of wide band gap (BiO) 2 CO 3
year: 2017

abstract: Abstract Nano Carbon Hollow Spheres (NCHS) with a mean size of 40 70 nm were synthesized from Ricinus Communis (RC) oil by air controlled, low temperature direct pyrolysis in an indigenous reactor assembly using multi metal catalyst derived from Alternanthera sessilis stem. The multi metals present in the stem acts as a green catalyst for the formation of NCHS. The synthesized carbon spheres has a bulk density of 0.025 g/cm 3 and BET surface area of 631 m 2 /g. Bubble growth mechanism was proposed for the formation of NCHS. A visible light active lanthanum doped NCHS (La@NCHS) photocatalyst was synthesized by doping lanthanum oxide with NCHS by chemical co doping scheme. The particle size, morphology, graphitic layer arrangements, functionalities, band gap energy and composition of the La@NCHS were evaluated using FE SEM, HRTEM, XRD, FT IR, DRS and EDX. Kinetics and mechanism of UV and solar light supported dye degradation study for basic methylene blue (MB) was investigated and the effects of MB concentration, catalyst dosage and pH were explored for La@NCHS. The synthesized composite catalyst has excellent photocatalytic degradation under solar light.
author_names: Balakrishnan Murugesan

A Sivakumar

A Loganathan

Pandian Sivakumar
title: Synthesis and photocatalytic studies of lanthanum oxide doped nano carbon hollow spheres
year: 2017

abstract: A facile method was developed to graft cationic Ag clusters on (BiO)2CO3 hierarchical superstructures (BHS) surface to improve their visible light activity. Significantly, the resultant Ag clusters grafted BHS displayed a highly enhanced visible light photocatalytic performance for NOx removal due to the direct interfacial charge transfer (IFCT) from BHS to Ag clusters. The chemical and coordination state of the cationic Ag clusters was determined with the extended X ray absorption fine structure (EXAFS) and a theoretical structure model was proposed for this unique Ag clusters. The charge transfer process and the dominant reactive species (OH) were revealed on the basis of electron spin resonance (ESR) trapping. A new photocatalysis mechanism of Ag clusters grafted BHS under visible light involving IFCT process was uncovered. In addition, the cationic Ag clusters grafted BHS also demonstrated high photochemical and structural stability under repeated photocatalysis runs. The perspective of enhancing photocatalysis through combination of microstructural optimization and IFCT could provide a new avenue for the developing efficient visible light photocatalysts.
author_names: Xin Feng

Wendong Zhang

Hua Deng

Zilin Ni

Fan Dong

Yuxin Zhang
title: Efficient visible light photocatalytic NOx removal with cationic Ag clusters grafted (BiO)2CO3 hierarchical superstructures.
venue: Journal of hazardous materials
year: 2017

abstract: In order to achieve efficient photocatalytic NO removal, N doped (BiO)2CO3 hierarchical superstructures deposited with Pt quantum dots (2 4 nm) were fabricated by a one pot hydrothermal method using ammonium bismuth citrate and H2PtCl6 as precursors. In such a combined way, visible light absorption and charge carrier separation can be simultaneously enhanced. The as prepared Pt/N doped (BiO)2CO3 catalysts exhibited a highly enhanced visible light photocatalytic performance for NO removal and phenol degradation, which can be ascribed to the N doping that narrows the band gap, the formation of a Schottky barrier because of Pt that promotes electron/hole separation, and scattering and surface reflecting effects (SSR) caused by the hierarchical architecture. To reveal the reaction mechanism of photocatalytic NO oxidation, in situ DRIFTS investigation was applied to probe the reaction process, and a new intermediate, NO+ was firstly discovered during photocatalysis. Pt quantum dot deposition could change the reaction pathway via the inhibition of NO2 production. Based on ESR trapping and time dependent observation of the reaction products, a new photocatalytic reaction pathway was proposed for photocatalytic NO oxidation with Pt/N doped (BiO)2CO3. The present work could provide new perspectives for advancing the photocatalysis efficiency, offer a new insight into the photocatalytic NO oxidation process and promote large scale environmental applications of high performance photocatalysts.
author_names: Xing'an Dong

Wendong Zhang

Wenquan Cui

Yanjuan Sun

Hong-wei Huang

Zhongbiao Wu

Fan Dong
title: Pt quantum dots deposited on N doped (BiO)2CO3: enhanced visible light photocatalytic NO removal and reaction pathway
year: 2017

abstract: Fe(III) clusters were facilely grafted on the surface of (BiO)2CO3 (BC) hierarchical superstructures by soaking the BC in Fe(NO3)3 aqueous solution. The presence of Fe (III) clusters was confirmed with HRTEM, XPS and UV vis DRS. The ESR trapping result revealed that the .OH radicals are the dominant reactive species responsible for photocatalytic NO oxidation. The production of .OH radicals was significantly promoted by the Fe(III) clusters due to the enhanced charge separation. The Fe(III) cluster grafted BC displayed a highly enhanced visible light photocatalytic performance due to the direct interfacial charge transfer (IFCT) from BC to the Fe clusters. The Fe(III) cluster grafted BC also demonstrated high photochemical and structural stability during multiple runs. A new visible light induced photocatalysis mechanism over Fe(III) cluster grafted BC involving an IFCT process was firstly proposed. The in situ DRIFTS investigation revealed that the adsorbed NO could react with the dominant .OH radicals and generate the final products NO2 and NO3 via the production of the intermediate NO2, NO2+ and NO+ species. The perspective of enhancing photocatalysis via IFCT could provide a new avenue for the modification of other efficient photocatalysts for enhanced performance.
author_names: Xin Feng

Wendong Zhang

Yanjuan Sun

Hong-wei Huang

Fan Dong
title: Fe(III) cluster grafted (BiO)2CO3 superstructures: in situ DRIFTS investigation on IFCT enhanced visible light photocatalytic NO oxidation
year: 2017

abstract: Abstract A novel Z scheme AgI/Ag/I (BiO) 2 CO 3 composite was constructed through a two step in situ transforming process. AgI nanoparticles were firstly generated on the surface of I (BiO) 2 CO 3 via ion exchange step and then metallic Ag was formed by decomposing tiny of AgI in the photocatalytic process. Under visible light (l 400 nm) the as prepared AgI/Ag/I (BiO) 2 CO 3 composite intensively enhanced activity for rhodamine B degradation with corresponding k app value 0.63 h 1 in comparison with the reference samples. By means of the metallic Ag bridge, AgI/Ag/I (BiO) 2 CO 3 displayed excellent separation efficiency of photocharges on the basis of a Z scheme mechanism. Moreover, AgI/Ag/I (BiO) 2 CO 3 kept good stability under visible light. This study provides a universal way to in situ construct highly efficient Z scheme (BiO) 2 CO 3 based photocatalytic system applied for eliminating contaminants in wastewater.
author_names: Lei Liang

Jing Cao

Haili Lin

Meiyu Zhang

Xiaomin Guo

Shifu Chen
title: A novel double visible light active Z scheme AgI/Ag/I (BiO)2CO3 composite: Automatic formation of Ag bridge in the photocatalytic process
year: 2017

abstract: Abstract A ternary plasmonic Ag/AgCl (BiO) 2 CO 3 photocatalyst was successfully synthesized via a facile method. The as prepared samples were characterized by X ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy, X ray photoelectron spectroscopy, UV vis diffuse reflection spectra, N 2 adsorption desorption isotherms, photoluminescence spectra, photocurrent generation measurement, time resolved fluorescence and in situ FT IR spectra. The Ag/AgCl (BiO) 2 CO 3 composites exhibited outstanding visible light photocatalytic performance for removal of NO in air, which can be ascribed to the cooperation of surface plasmon resonance effect (SPR effect) surface scattering and reflecting effect (SSR effect) and efficient separation of electron hole pairs. Moreover, the in situ DRIFTS were applied to elucidate the photocatalytic oxidation process for NO removal and also can further explain the enhanced photocatalytic activity of ternary Ag/AgCl (BiO) 2 CO 3 composites. And a conceivable visible light photocatalysis mechanism was proposed in detail. The present work could provide a new perspective for the fabrication and understanding of plasmon enhanced visible light photocatalysts.
author_names: Wenquan Cui

Xinwei Li

Chunfeng Gao

Fan Dong

Xiongbo Chen
title: Ternary Ag/AgCl (BiO)2CO3 composites as high performance visible light plasmonic photocatalysts
year: 2017

abstract: Abstract (BiO)2CO3 (BOC) has been studied extensively due to its good photocatalytic performance for dyes and organic pollutants degradation. The common bismuth source like Bi(NO3)3 is easy to hydrolysis, which makes the reaction slow and it is hard to obtain uniform structure at room temperature. Herein, dilute ammonia solution was used to dissolve the bismuth citrate and make the bismuth cation free in the aqueous solution, and as a consequence, it could homogeneously react with CO32 at room temperature. The resulted product presented nanosheet based 3D hierarchical spherical appearance with a hollow interior, which exhibited enhanced visible light photocatalytic activity as compared to BOC compact packed microspheres obtained via hydrothermal method (HT BOC) On the basis of this, Bi2S3/(BiO)2CO3 (S BOC) were synthesized by a one pot room temperature route and the photocatalytic activity was further increased due to the construction of the heterojunction.
author_names: Yao Wu

Qiaofeng Han

Li Wang

Xin Wang

Junwu Zhu
title: One pot synthesis of 3D hierarchical Bi2S3/(BiO)2CO3 hollow microspheres at room temperature and their photocatalytic performance
year: 2017

abstract: Abstract BiOCl and (BiO) 2 CO 3 nanosheets with predominantly exposed {001} facets (respectively denoted as BiOCl 001 and (BiO) 2 CO 3 001) were easily synthesized at room temperature in aqueous urea solution. Urea could not only prohibit the hydrolysis of Bi(NO 3 3 *5H 2 O, but also inhibit the growth of (001) plane, leading to the formation of BiOCl and (BiO) 2 CO 3 nanosheets with dominant {001} facets. As compared to BiOCl and (BiO) 2 CO 3 thick sheets without preferentially exposed facets, both BiOCl 001 and (BiO) 2 CO 3 001 exhibit universally enhanced photocatalytic performance toward decomposition of multiple contaminants including dye model rhodamine (RhB) methylene blue (MB) and crystal violet (CV) under visible light l 420 nm) irradiation, and phenol and salicylic acid (SA) under simulated sunlight. The as prepared BiOCl 001 and (BiO) 2 CO 3 001 also possess high photochemical stability and therefore may become potential photocatalysts for practical application in environmental remedies.
author_names: Yao Wu

Qiaofeng Han

Li Wang

Xiaohong Jiang

Xin Wang

Junwu Zhu
title: Room temperature synthesis of BiOCl and (BiO)2CO3 with predominant {001} facets induced by urea and their photocatalytic performance
year: 2017

abstract: Semimetal bismuth with plasmonic properties has triggered increased interests. In this work, a facile strategy was developed to synthesize the Bi/(BiO)2CO3 (Bi BOC) nanocomposites and Bi elemental photocatalysts. The Bi nanoparticles were produced via the insitu reduction of (BiO)2CO3 by NaBH4. The catalysts were utilized for the photocatalytic NO removal under visible light and UV illumination. Significantly, the photocatalytic capability of the Bi BOC was highly enhanced with an unprecedented NO removal of 63.6% The Bi metal demonstrated a direct plasmonic photocatalytic NO removal ratio of 53.6% under UV irradiation. The significantly enhanced photocatalytic capability of Bi BOC can be ascribed to the synergistic effects of the SPR effect, enhanced visible light harvesting and the efficient electron hole separation induced by Bi nanoparticles. The Bi nanoparticles can perform as a non noble metal based plasmonic cocatalyst for advancing photocatalytic ability. The mechanism of photocatalytic NO oxidation was proposed and compared under both visible light and UV illumination. Furthermore, the Bi BOC photocatalysts showed good photochemical stability under repeated tests. This work could not only offer new insights into in situ fine tune reduction strategy for Bi based photocatalysts, but also proves the potentials of utilizing low cost Bi cocatalysts as a substitute for noble metals to improve other photocatalysts.
author_names: Yanjuan Sun

Zaiwang Zhao

Wendong Zhang

Chunfeng Gao

Yuxin Zhang

Fan Dong
title: Plasmonic Bi metal as cocatalyst and photocatalyst: The case of Bi/(BiO)2CO3 and Bi particles.
venue: Journal of colloid and interface science
year: 2017