Search query: removal of phenol and CR

Related papers:

abstract: Harvesting visible light of the solar spectrum by coupled semiconductor based systems is advantageous for photocatalytic as well as photovoltaic applications. One pot synthesis of several CdS/CeO2 nanomaterials has been carried out without using expensive surfactants, capping agents and molecular linkers. Various techniques such as X ray diffraction (XRD) transmission electron microscopy (TEM) X ray photoelectron spectroscopy (XPS) diffuse reflectance UV vis spectroscopy, Raman spectroscopy and BET surface area were used to characterize the samples. XRD and Raman spectroscopic data provided the information about the presence of both CdS and CeO2 phases. TEM proves the proper dispersion and well connectivity between the CdS and CeO2 which may be due to the single step synthesis of the composites. UV vis spectroscopy reveals the absorption in both UV and visible regions due to the presence of both CeO2 and CdS. The visible light activity of the composites have been ascribed by the H2 production from water by using sacrificial reagents, simultaneous removal of phenol and Cr(VI) from aqueous streams. Among the synthesized composites CdS/CeO2 (1:1) has shown superior activity which can be attributed to the optimum sensitization of CeO2 which induces enhanced electron transfer from CdS to CeO2 that decreases the exciton recombination.
author_names: A Daya Mani

Swarnava Nandy

Ch Subrahmanyam
title: Synthesis of CdS/CeO2 nanomaterials for photocatalytic H2 production and simultaneous removal of phenol and Cr(VI)
year: 2015

abstract: Harvesting visible light of the solar spectrum by coupled semiconductor based systems where sensitization of a wide band gap semiconductor with a small band gap semiconductor advantageous for photocatalytic as well as photovoltaic applications. A facile one pot synthesis of several CdS/CeO2 hetero nanostructures has been carried out without using expensive surfactants, capping agents and molecular linkers. Various techniques such as Xray diffraction (XRD) Transmission electron microscopy (TEM) X ray photoelectron spectroscopy (XPS) diffuse reflectance UV Vis spectroscopy, Raman spectroscopy and BET surface area were used to characterize the samples. XRD and Raman spectroscopic data provided the information about the presence of both CdS and CeO2 phases. TEM proves the proper dispersion and well connectivity between the CdS and CeO2 which may be due to the single step synthesis of the composites. XPS gives the information about the presence of elements such as Cd, Ce, O, S, C and N, where the presence of latter two elements can be attributed to the in situ C and N doping during the combustion synthesis. UV visible spectroscopy reveals the absorption in both UV and visible regions due to the presence of both CeO2 and CdS. The visible light activity of the composites have been ascribed by the H2 production from water by using sacrificial reagents, simultaneous removal of phenol and Cr(VI) from aqueous streams. Among the synthesized composites CdS/CeO2 (1:1) has shown superior activity which can be attributed to the optimum sensitization of CeO2 which induces enhanced electron transfer from CdS to CeO2 that decreases the exciton recombination.
author_names: Swarnava Nandy

Subrahmanyam Ch
title: Synthesis of CdS/CeO2 hetero nanostructures for Photocatalytic H2 production and simultaneous Removal of phenol and Cr(VI)
year: 2014

abstract: TiO2 nanotube arrays were prepared by electrochemical anodization on pure Ti surfaces.The products were characterized by X ray diffraction,scanning electron microscopy and electrochemical workstation.The results showed that the prepared sample was anatase with a diameter of about 100 nm and a tube length of about 2mm.The maximum photocurrent could be achieved when the bias potential of 0.5 V was applied on the TiO2 nanotube array electrode.The photoelectrocatalytic properties of the TiO2 nanotube array electrode were evaluated by the simultaneous removal of phenol and Cr(VI).The effects of catalytic processes,pH values,and various initial concentrations of Cr(VI) and phenol on the removal efficiency of phenol and Cr(VI) were investigated.The results indicated that in the photoelectrocatalytic mode,phenol and Cr(VI) removal ratios were 86.7% and 96.9%,respectively,while in the photocatalytic mode they were 48.2% and 65.2%,respectively.The removal efficiency by photoelectrocatalysis was higher than that by photocatalysis.The acidic solutions were favorable for the photoelectrocatalytic simultaneous removal of Cr (VI) and phenol,and the optimum pH was 2.In the phenol Cr(VI) co existed system,phenol and Cr(VI) were more efficiently eliminated than in the single phenol or Cr(VI) system.The reduction of Cr(VI) and the oxidation of phenol produced a synergistic effect,which promoted the simultaneous removal of Cr(VI) and phenol.
author_names: Huang Lang-huan
title: Simultaneous Removal of Phenol and Cr(VI) by TiO_2 Nanotube Array Photoelectrocatalysis
year: 2011

author_names: Houjin Wang

Xiaojing Wu

Yaling Wang

Zibin Jiao

Sheng Yan

Lan Huang
title: Simultaneous Removal of Phenol and Cr(VI) by TiO 2 Nanotube Array Photoelectrocatalysis: Simultaneous Removal of Phenol and Cr(VI) by TiO 2 Nanotube Array Photoelectrocatalysis
year: 2011

abstract: A powerful photocatalyst is the key for photocatalytic environmental purification via sunlight harvesting and utilization. In this work, novel boron doped Sn3O4 microspheres constructed from nanoplates were designed and fabricated. Density functional theory (DFT) studies were carried out to investigate the boron doping mechanism, in which DFT predicted that boron doping would enhance the light harvesting capability and the photo response of Sn3O4, which was proved by diffuse reflectance spectra (DRS) and transient photocurrent responses. Attributed to its unique porous structure, and enhanced light harvesting and high carrier utilization capabilities, the boron doped Sn3O4 microsphere exhibited high efficiency for Cr(IV) removal and azo dyestuff degradation. Moreover, an unexpected synergistic effect upon simultaneous removal of phenols (phenol, bisphenol A and p chlorophenol) and Cr(VI) was observed.
author_names: Changling Yu

Debin Zeng

Qizhe Fan

Kai Yang

Julan Zeng

Long Wei

Junhui Yi

Hongbing Ji
title: The distinct role of boron doping in Sn3O4 microspheres for synergistic removal of phenols and Cr(vi) in simulated wastewater
year: 2020

abstract: Simultaneous phenol and Cr(VI) bioremoval by two different mixed cultures, from petroleum contaminated soil (PS) and boron contaminated wastewater (BW) was investigated in regard to different culture media, pH levels (6 8) initial phenol (25 100 mg/L) and Cr(VI) (15 50 mg/L) concentrations. The optimum medium was found to be mineral salt medium tested, which contained 1% (v/v) molasses (MSM) Optimum pH values were 6 for PS and 8 for BW. All of the phenol present in the samples was mineralized regardless of its concentrations tested, Cr(VI) bioremoval was enhanced by the increase in phenol concentrations, and molasses also exerted a positive effect on Cr(VI) removal, and the yields reached 100% for both pollutants, even at 13.1 mg/L Cr(VI) and 91.1 mg/L phenol concentration in PS samples. In MSM containing PS samples approximate efficiency was 100% for phenol removal; but Cr(VI) removal ratios were 64.9% and 41.7% at 25.8 mg/L and 41.3 mg/L concentrations, respectively. Finally it can be concluded that molasses stimulated Cr(VI) bioremoval at elevated phenolic conditions in the mixed microbial culture, and molasses might be of use for the bioremediation of phenol and Cr(VI) polluted wastewaters.
author_names: Nur Kocberber Kilic

Gonul Donmez
title: Dual bioremediation of phenol and Cr(VI) by mixed microbial cultures in the presence of molasses.
venue: Water science and technology a journal of the International Association on Water Pollution Research
year: 2017

abstract: Biological treatment of industrial wastewater containing heavy metal and organic pollutant has attracted extensive attention. In this study, Cr(VI) reduction coupled with phenol degradation was investigated by the sulfate reducing bacteria (SRB) sludge with addition of zero valent iron (ZVI) The results showed that the SRB wet sludge (SWS) had a good bioactivity in the reduction of Cr(VI) only when the initial concentration of Cr(VI) was below 60 mg L 1. The addition of ZVI significantly enhanced the bioactivity and reusability of SWS, and the reduction percentage of Cr(VI) achieved 98% after SWS was successively used for seven cycles. SWS coupled with ZVI showed a high activity in phenol degradation, with more than 94% phenol being degraded in each cycle. However, in the simultaneous removal of Cr(VI) and phenol, phenol degradation was inhibited due to the toxicity of Cr(VI) to phenol degrading microbes in SWS. On the other hand, reduction of sulfate and Cr(VI) was not affected by the presence of phenol, with more than 95% of sulfate and Cr(VI) being removed at the end of the 5th cycle. This study enriches our understanding on the applications of the SRB sludge in the removal of organic and inorganic contaminants in wastewater.
author_names: Xu Han

Tuo Zhou

S W Xu

Yan Zun Li

Y -F Wang

Yong Qiu Liu
title: Removal of Cr(VI) and phenol coupled with the reduction of sulfate by sulfate reducing bacteria sludge
venue: International Journal of Environmental Science and Technology
year: 2017

abstract: The applicability of bentonite supported nanoscale zero valent iron (B nZVI) as a catalyst to activate persulfate (PS) for the simultaneous removal of Cr(VI) and phenol was systematically investigated in this study. Experimental results demonstrated that phenol degradation was significantly enhanced under acidic condition and with oxygen supply, whereas the Cr(VI) reduction was not obviously declined. The removal efficiencies of Cr(VI) and phenol in B nZVI/PS combined system were 99.8 and 72.3% respectively. Cr(VI) reduction and phenol oxidation was simultaneously achieved in B nZVI/PS combined system, which provided a promising environmental treatment for industrial wastewater containing metal ions and organic compounds. An acidic condition was more favorable to the decomposition of persulfate for the production of sulfate radicals. Radical scavenging tests revealed that the predominant reactive oxygen species for phenol degradation was SO4( neither HO nor O2( A reaction mechanism, which involves the Cr(VI) removal mainly by the reduction of nZVI and the degradation of phenol mainly by the SO4( from the decomposition of persulfate, was proposed. These findings revealed that B nZVI/PS combined system has a potential in the environmental remediation polluted jointly by organic compounds and/or heavy metals.
author_names: Zenghui Diao

Xiangrong Xu

Hui Chen

Dan Jiang

Yuxi Yang

Lingjun Kong

Yuxin Sun

Yongxia Hu

Qin-Wei Hao

Ling Liu
title: Simultaneous removal of Cr(VI) and phenol by persulfate activated with bentonite supported nanoscale zero valent iron: Reactivity and mechanism.
venue: Journal of hazardous materials
year: 2016

abstract: In this work, Ag3PO4/PANI/Cr:SrTiO3 photocatalysts were designed to effectively eliminate organic pollutants including Rhodamine B and phenol from high salinity wastewater under visible light. The phase composition, optical properties, and morphology of powders were studied, and the effects of inorganic salts on removal performance of the as prepared particles were also tested. Results showed that the photocatalytic activities of Ag3PO4/PANI/Cr:SrTiO3 composites for Rhodamine B and phenol reached 100% within 10 min and 18 min, respectively. The reaction rate of pure Ag3PO4 was 7 times less than that of the ternary composite with the adding of PANI and Cr:SrTiO3. The activity of Ag3PO4/PANI/Cr:SrTiO3 remained at 92.25% after five cycles, so the photocatalytic and recyclable performance of ternary composite was greatly improved. In addition, when there was SO42 with a content of ranging from 1% to 21% the degradation activity of the ternary catalyst under visible light was not changed for Rhodamine B, which indicated that the ternary catalyst exhibited the excellent sulfate resistance ability. Results from ESR and radical trapping experiments showed that O2 and h+ made an important contribution to visible light photocatalytic activities.
author_names: Xiaochao Yu

Yan Lin

Haiyang Liu

Chunping Yang

Yanrong Peng

Cheng Du

Shaohua Wu

Xiaorui Li

Yuanyuan Zhong
title: Photocatalytic performances of heterojunction catalysts of silver phosphate modified by PANI and Cr doped SrTiO3 for organic pollutant removal from high salinity wastewater.
venue: Journal of colloid and interface science
year: 2019

abstract: This study was designed to isolate, identify and characterize micro organisms or mixed cultures capable of simultaneously removing Cr (VI) and phenol in the surrounding area of a tannery localized in Elena, Cordoba, Argentina. In addition, nutritional and physical factors were optimized in order to improve the removal efficiency in a real effluent.
author_names: Ornella M Ontanon

Paola S Gonzalez

Elizabeth Agostini
title: Optimization of simultaneous removal of Cr (VI) and phenol by a native bacterial consortium: its use for bioaugmentation of co polluted effluents
venue: Journal of applied microbiology
year: 2015