1
|
He J, Chen J, Liu S, Lin L, Zhang Y, Xiao S, Cao S. Activated carbon modified titanium dioxide/bismuth trioxide adsorbent: One-pot synthesis, high removal efficiency of organic pollutants, and good recyclability. J Colloid Interface Sci 2023; 648:1034-1043. [PMID: 37364308 DOI: 10.1016/j.jcis.2023.05.206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Revised: 05/08/2023] [Accepted: 05/31/2023] [Indexed: 06/28/2023]
Abstract
Considerable endeavors have focused on tightly combining adsorption with photocatalysis in designing composite materials for environmental pollution treatment. Recent advances in coupling titanium dioxide/bismuth trioxide (TiO2/Bi2O3) with activated carbon (AC) show significantly enhanced photocatalytic performance but face critical limitations including low adsorption capacity and multi-step synthesis. In this work, we introduce a one-pot synthesis of activated carbon modified TiO2/Bi2O3 composite materials (TiO2/Bi2O3/AC). Thanks to the integrated adsorbent/photocatalyst system, TiO2/Bi2O3/AC shows a drastically enhanced removal efficiency for sulfamethazine (>81%), far beyond the corresponding value of the reported AC/TiO2/Bi2O3 adsorbent (<40%). Notably, the removal rates of other typical pollutants including tetracyclines, methyl orange, and rhodamine B are as high as >98%. Furthermore, TiO2/Bi2O3/AC obtains >80% of its adsorption rate for the fifth cycle after simple photo-regeneration without any other post-treatments. Kinetic analysis and photoelectric characterization are carried out to provide insight into adsorption mechanism. Therefore, this work demonstrates a considerable potential to design and construct other multifunctional adsorbents with advanced performance.
Collapse
Affiliation(s)
- Jie He
- School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Juanrong Chen
- School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.
| | - Shunan Liu
- School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Liyuan Lin
- School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Ying Zhang
- Anhui Provincical Key Laboratory for Degradation and Monitoring of Pollution of the Environment, Fuyang Normal University, Fuyang 236037, China
| | - Sisi Xiao
- School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Shunsheng Cao
- Research School of Polymer Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China; Anhui Provincical Key Laboratory for Degradation and Monitoring of Pollution of the Environment, Fuyang Normal University, Fuyang 236037, China.
| |
Collapse
|
2
|
Photocatalytic Reduction of Nitrates and Combined Photodegradation with Ammonium. Catalysts 2022. [DOI: 10.3390/catal12030321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Bare titania and metal-promoted TiO2 catalysts were employed in the treatment of nitrates, which are ubiquitous pollutants of wastewater. The results show that the process can be carried out under visible light (from a white light LED lamp) and, in the best case, 23.5% conversion of nitrate was obtained over 4 h with full selectivity towards N2 by employing 0.1 mol% Ag/TiO2 prepared by flame spray pyrolysis. Moreover, the performance was worse when testing the same catalysts with tap water (11.3% conversion), due to the more complex composition of the matrix. Finally, it was found that photoreduction of nitrate can be effectively performed in combination with photo-oxidation of ammonium without loss in the activity, opening up the possibility of treating highly polluted wastewater with a single process. The latter treatment employs the two contaminants simultaneously as electron and holes scavengers, with very good selectivity, in a completely new process that we may call Photo-Selective Catalytic Reduction (Photo-SCR).
Collapse
|
3
|
Bi J, Tao Q, Huang X, Wang J, Wang T, Hao H. Simultaneous decontamination of multi-pollutants: A promising approach for water remediation. CHEMOSPHERE 2021; 284:131270. [PMID: 34323782 DOI: 10.1016/j.chemosphere.2021.131270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 05/08/2021] [Accepted: 06/15/2021] [Indexed: 06/13/2023]
Abstract
Water remediation techniques have been extensively investigated due to the increasing threats of soluble pollutants posed on the human health, ecology and sustainability. Confronted with the complex composition matrix of wastewater, the simultaneous elimination of coexisting multi-pollutants remains a great challenge due to their different physicochemical properties. By integrating multi-contaminants elimination processes into one unit operation, simultaneous decontamination attracted more and more attention under the consideration of versatile applications and economical benefits. In this review, the state-of-art simultaneous decontamination methods were systematically summarized as chemical precipitation, adsorption, photocatalysis, oxidation-reduction, biological removal and membrane filtration. Their applications, mechanisms, mutual interactions, sustainability and recyclability were outlined and discussed in detail. Finally, the prospects and opportunities for future research were proposed for further development of simultaneous decontamination. This work could provide guidelines for the design and fabrication of well-organized simultaneous decontaminating system.
Collapse
Affiliation(s)
- Jingtao Bi
- National Engineering Research Center of Industry Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Qingqing Tao
- National Engineering Research Center of Industry Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Xin Huang
- National Engineering Research Center of Industry Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China; Co-Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China.
| | - Jingkang Wang
- National Engineering Research Center of Industry Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China; Co-Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China; State Key Laboratory of Chemical Engineering, Zhejiang University, Hangzhou, China
| | - Ting Wang
- National Engineering Research Center of Industry Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China; Co-Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China
| | - Hongxun Hao
- National Engineering Research Center of Industry Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China; Co-Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China; State Key Laboratory of Chemical Engineering, Zhejiang University, Hangzhou, China.
| |
Collapse
|
4
|
Adsorption Studies on Magnetic Nanoparticles Functionalized with Silver to Remove Nitrates from Waters. WATER 2021. [DOI: 10.3390/w13131757] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This paper presents a novel procedure for the treatment of contaminated water with high concentrations of nitrates, which are considered as one of the main causes of the eutrophication phenomena. For this purpose, magnetic nanoparticles functionalized with silver (Fe3O4@AgNPs) were synthesized and used as an adsorbent of nitrates. Experimental conditions, including the pH, adsorbent and adsorbate dose, temperature and contact time, were analyzed to obtain the highest adsorption efficiency for different concentration of nitrates in water. A maximum removal efficiency of 100% was reached for 2, 5, 10 and 50 mg/L of nitrate at pH = 5, room temperature, and 50, 100, 250 and 500 µL of Fe3O4@AgNPs, respectively. The characterization of the adsorbent, before and after adsorption, was performed by energy dispersive X-ray spectroscopy, scanning electron microscopy, Brunauer-Emmett-Teller analysis and Fourier-transform infrared spectroscopy. Nitrates can be desorbed, and the adsorbent can be reused using 500 µL of NaOH solution 0.01 M, remaining unchanged for the first three cycles, and exhibiting 90% adsorption efficiency after three regenerations. A deep study on equilibrium isotherms reveals a pH-dependent behavior, characterized by Langmuir and Freundlich models at pH = 5 and pH = 1, respectively. Thermodynamic studies were consistent with physicochemical adsorption for all experiments but showed a change from endothermic to exothermic behavior as the temperature increased. Interference studies of other ions commonly present in water were carried out, enabling this procedure as very selective for nitrate ions. In addition, the method was applied to real samples of seawater, showing its ability to eliminate the total nitrate content in eutrophized waters.
Collapse
|
5
|
Briche S, Derqaoui M, Belaiche M, El Mouchtari EM, Wong-Wah-Chung P, Rafqah S. Nanocomposite material from TiO 2 and activated carbon for the removal of pharmaceutical product sulfamethazine by combined adsorption/photocatalysis in aqueous media. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:25523-25534. [PMID: 32347507 DOI: 10.1007/s11356-020-08939-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 04/17/2020] [Indexed: 05/27/2023]
Abstract
This work was dedicated to the elaboration of new composite materials based on activated carbon and titanium oxide as an ecological solution for the cleaning of water contaminated with pharmaceutical pollutants. Such new composite materials allowed the combining of adsorption and photocatalytic process, which allows a cleaning process that is low cost making them promising materials. The functionalization of the surface of activated carbon (AC) by TiO2 nanoparticles forms the core of the nanocomposite material. This was accomplished using sol-gel process with molar ratios Rn (nTi/nAC) in the range of 1/10 to 7/10 followed by a calcination step (400 °C, N2, 2 h). Using various characterization techniques, AC surface functionalization was confirmed and the formation of a TiO2 coating on the AC was noticed with TiO2 under its unique anatase crystallographic form. The study of adsorption and photocatalytic degradation of the sulfamethazine antibiotic demonstrated that the most photoactive nanocomposite corresponds to the one with Rn = 0.5. Freundlich model was proved to be a perfect fit with the experimental results stating that the adsorption is of multilayer nature on the surface of the adsorbent and with interactions between the pollutants adsorbed on its surface. The photocatalytic degradation of the remaining pharmaceutical pollutant in the solution was evidenced and essentially occurred through the involvement of hydroxyl radicals formed by the excitation of the photocatalyst. The formation of the photoproducts analyzed by the LC/MS technique implies the splitting of the sulfonamide bridge, and by the hydroxylation of the aromatic ring and the pyrimidine group.
Collapse
Affiliation(s)
- Samir Briche
- Département Stockage de l'Energie et Revêtements Multifonctionnels (SERM), Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Rue Mohamed El Jazouli, Madinat Al Irfane, 10100, Rabat, Morocco
| | - Mohammed Derqaoui
- Département Stockage de l'Energie et Revêtements Multifonctionnels (SERM), Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Rue Mohamed El Jazouli, Madinat Al Irfane, 10100, Rabat, Morocco
- Laboratoire de Chimie Analytique et Moléculaire (LCAM), Département de Chimie, Faculté Polydisciplinaire de Safi, Université Cadi Ayyad, Sidi Bouzid, B.P. 4162, 46000, Safi, Morocco
| | - Mohammed Belaiche
- Département Stockage de l'Energie et Revêtements Multifonctionnels (SERM), Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Rue Mohamed El Jazouli, Madinat Al Irfane, 10100, Rabat, Morocco
| | - El Mountassir El Mouchtari
- Laboratoire de Chimie Analytique et Moléculaire (LCAM), Département de Chimie, Faculté Polydisciplinaire de Safi, Université Cadi Ayyad, Sidi Bouzid, B.P. 4162, 46000, Safi, Morocco
| | - Pascal Wong-Wah-Chung
- Aix Marseille Université, CNRS, LCE, UMR 7376, 13545, Aix en Provence Cedex 4, France
| | - Salah Rafqah
- Laboratoire de Chimie Analytique et Moléculaire (LCAM), Département de Chimie, Faculté Polydisciplinaire de Safi, Université Cadi Ayyad, Sidi Bouzid, B.P. 4162, 46000, Safi, Morocco.
| |
Collapse
|
6
|
Shah Z, Nazir S, Mazhar K, Abbasi R, Samokhvalov IM. PEGylated doped- and undoped-TiO 2 nanoparticles for photodynamic Therapy of cancers. Photodiagnosis Photodyn Ther 2019; 27:173-183. [PMID: 31136827 DOI: 10.1016/j.pdpdt.2019.05.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 04/14/2019] [Accepted: 05/17/2019] [Indexed: 12/12/2022]
Abstract
Titanium dioxide has been widely known for its phototoxicity in the environmental context, but little is known for its use in the photodynamic therapy of cancers. Previous studides have shown the hazardous effects of undoped-titanium dioxide nanoparticles (undoped-TiO2 NPs) in the ecosystem; however, it remains to explore the effect of polyethylene glycol (PEG) conjugation and doping of metal and non-metal on the photodynamic activity of TiO2. Here we report the synthesis, characterizations, and applications of doped- and undoped-TiO2 NPs stabilized by PEG in the photodynamic therapy of cancers. Our results demonstrate that in vitro PEG-NPs significantly reduced the survival of human cervical cancer cells (HeLa) upon solar and ultraviolet (UV) radiations. We found that doping of the metal (cobalt) and non-metal (nitrogen) onto TiO2 nanocrystals enhanced the photoactivation of doped-TiO2 NPs in the visible/near infrared (Vis/NIR) region, but these nanocrystals were revealed by cytotoxicity assays to be less potent in killing cancer cells compared to PEGylated undoped-TiO2. The significant photodynamic effect was shown by PEGylated undoped-TiO2 synthesized through the sol-gel method with 75% killing of HeLa cells at 5.5 μg/mL concentrations in exposure to UV or sunlight radiations. In vitro cytotoxicity was measured by Sulforhodamine B (SRB) and 3-(4, 5-Dimethylthiazol-2-Yl)-2,5-Diphenyltetrazolium Bromide (MTT) assays after irradiations with IR, UV, and sunlight for 15-30 minutes (min). All the synthesized NPs were characterized by XRD, AFM, SEM, EDX and DRS chemical analysis. Taken together, our data demonstrate that water-soluble PEGylated TiO2 NPs maybe a good candidate for the photodynamic therapy of cervical cancer cells. Our data propose that the use of PEG surfactant can enhance the potency of already available photochemical therpeutic agents.
Collapse
Affiliation(s)
- Zahir Shah
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, 510530, China; Key Laboratory of Regenerative Biology, Chinese Academy of Sciences, Guangdong Provincial Key Laboratory of Stem Cells and Regenerative Medicine, Guangzhou, 510530, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Samina Nazir
- College of Science, King Faisal University, Al-Ahsa, Saudi Arabia.
| | - Kehkashan Mazhar
- Institute of Biomedical & Genetic Engineering (IBGE), Sector G-9/1, Islamabad, Pakistan
| | - Rashda Abbasi
- Institute of Biomedical & Genetic Engineering (IBGE), Sector G-9/1, Islamabad, Pakistan
| | - Igor M Samokhvalov
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, 510530, China; Key Laboratory of Regenerative Biology, Chinese Academy of Sciences, Guangdong Provincial Key Laboratory of Stem Cells and Regenerative Medicine, Guangzhou, 510530, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| |
Collapse
|