ACS ES&T Engineering
·
2023
·
IF 7.1
Junna Yan,Mengyu Ma,Keyi Liu,Yang Bao,Feihu Li
Efficient removal and recovery of phosphorus (P) from wastewater is critical for addressing both phosphate rock depletion and eutrophication-related deterioration of surface water quality. Herein, we present a promising platform approach integrating cerium-doped NH2-MIL-101(Fe) with melamine sponge (MS) scaffolds for rapid and high-efficiency recovery of P from wastewater. The as-prepared MIL-101@sponge composites (denoted as MIL-101@CS, MIL-101@PVDF, and MIL-101@SDBS, respectively) are featured by flexibility and stability according to many characterization techniques. Batch adsorption of P over these composite adsorbents indicates that these MIL-101@sponge composites exhibit a maximum adsorption capacity (e.g., 253.66 mg g–1 for MIL-101@CS) at the optimum pH of 6.0 and that adsorption equilibrium can be attained within 150 min and well described by the pseudo-second-order kinetic model. In addition, these composites show a high selectivity for P over carbonate and other common monovalent anions under environmentally relevant conditions. The results of desorption and recycling tests indicate that MIL-101@CS retains good adsorption and desorption efficiency even in a much short operating time (i.e., 5 min), which allows such a composite to be applied in enriching and recovering P efficiently from wastewater via a rapid adsorption/desorption operation. Moreover, the high feasibility of MIL-101@CS in actual scenarios was validated by efficiently enriching the P from a sludge dewatering liquid. Furthermore, the main mechanisms for P adsorption are elucidated from various microstructural characterizations. Overall, this work presents a strategy of integrating MIL-101 with sponge scaffolds for rapidly and efficiently recovering P from wastewater, which may be potentially extended to the recovery of other value-added elements of interest from waste streams.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuohai Fang,Tonghan Yang,Wei He,Wenchao Yang,Nannan Wang,Shengshou Ma,Kaimin Shih,Changzhong Liao
High-entropy oxides have gained more attention in recent years due to their excellent performance. In this work, five new Ce-free high entropy fluorite oxides ((Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 Y 0.2 La 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 La 0.2 Nd 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 La 0.2 )O 2-δ and (Zr 0.2 Ti 0.2 Dy 0.2 Nd 0.2 La 0.2 )O 2-δ ) were successfully synthesized by solution combustion synthesis with glycine as fuel. Their formation, oxygen vacancy, and long-term thermal stability were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) techniques. XRD results show that single fluorite phase was observed in (Zr 0.2 Ti 0.2 Y 0.2 La 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 La 0.2 )O 2-δ and (Zr 0.2 Ti 0.2 Dy 0.2 Nd 0.2 La 0.2 )O 2-δ samples when sintering at 300, 600 and 900 °C, respectively, but (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 Sc 0.2 )O 2-δ sample with single-phase fluorite structure can only obtain by sintering at 900 °C and 1200 °C. For (Zr 0.2 Ti 0.2 La 0.2 Nd 0.2 Sc 0.2 )O 2-δ sample, single fluorite phase can be obtained at 300 °C using calculated fuel and at 900 °C with using excess fuel. In addition, all the samples may have lower crystallinity due to excess glycine. XPS results indicate that factors of sintering temperature, fuel ratio and cationic radii strongly affect the generation of oxygen vacancy, especially for the sintering temperature. Morphology of the high entropy fluorite oxides presents in sponge-like microstructure. Superior long-term stability at high temperature was found in samples (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 Sc 0.2 )O 2-δ and (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 La 0.2 )O 2-δ . The findings in this work may have great potential applications in oxygen-deficient catalyst and high temperature catalyst.
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CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Ruizhi Feng,Ying Zhang,Caigan Yan,Haihe Xiao,Xiaobiao Zhu,Xiaohui Wang
Electrochemical advanced oxidation processes (EAOPs) has attracted wide attention to researchers on all walks of life for the treatment of stubborn pollutants because of the strong oxidizing properties. However, the electrode materials currently developed have problems such as short life and low catalytic activity. In this work, the modification of PbO 2 electrode was started by introducing into blue nanotubes (Blue-TiO 2 -NTs) based on the titanium plate to enhance the conductivity of the electrode. Then the β-PbO 2 active layer was optimized by using cerium (Ce) and dodecyl trimethyl ammonium bromide (CTAB) through the method of electrodeposition to improve the electrocatalytic oxidation and stability. In the experiment of electrochemical oxidation, the degradation efficiency of phenol (100 mg/L) reached more than 96% after 120 min on the Blue-TiO 2 /PbO 2 -Ce-CTAB electrode. To further investigate the optimization mechanism of the Blue-TiO 2 /PbO 2 -Ce-CTAB anode in the electrocatalytic oxidation process, the surface structure, morphology, volt-ampere charge, oxygen evolution potential, and charge transfer resistance were evaluated. The result showed that the addition of CTAB reduced the crystal particles of PbO 2 , higher specific surface area of the electrode longitudinally by the Ce element, lower oxygen evolution potential, and smaller the resistance of charge transfer. Finally, the service life of the electrode was 6792 h by the accelerated life test on the current density of 25 mA cm −2 . The energy consumption after 240 min of degradation was 0.079 kWh gCOD −1 .This research proves that the Blue-TiO 2 /PbO 2 -Ce-CTAB electrode has potential application value in the degradation of phenol wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Shuai Liu,Hao Qu,Yu Mao,Lili Yao,Baolei Dong,Lei Zheng
Propyl gallate (PG) is a commonly used synthetic phenolic antioxidant in foodstuffs and industrial products. Due to the potential health risk of PG, rapid and on-site detection in food and environment samples are important to guarantee human health. Herein, we demonstrated rapid monitoring of PG by a fluorescence turn-on strategy based on a specific fluorogenic reaction between PG and polyethyleneimine (PEI). Specifically, Ce 4+ with oxidase-mimicking activity oxidized PG to its oxides, which then reacted with PEI through the Michael addition to generate the fluorescent compound. The proposed fluorogenic reaction had good specificity for PG, which could distinguish PG from other phenolic antioxidants and interferences. Furthermore, portable and low-cost organogel test kits were prepared using poly(ethylene glycol) diacrylate for quantitative and on-site detection of PG via a smartphone-based sensing platform. The organogel-based assay detection limit was 1.0 μg mL –1 with recoveries ranging from 80.2% to 106.2% in edible oils and surface water. Suitability of the developed assay was also validated by high-performance liquid chromatography . Our study provides an effective fluorescent approach to rapid, specific, and convenient monitoring of PG, which is useful for diminishing the risk of PG exposure.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yangjie Fu,Yanjie Mao,Longyang Wang,Mengyi Qiu,Youran Xu,Jianying Qian,Men Tan,Kejie Zhang,Derek Hao,Qi Wang,Guoxiang Yang
Proper design and successful synthesis of photocatalysts with efficient interfacial charge transfer, strong redox capabilities, and strong environmental applications are critical. Herein, a novel Z-scheme heterojunction AgI/Ce-2MI nanocomposite with redox-retaining properties was successfully prepared by a simple precipitation method. Compared with AgI and Ce-2MI, the efficiency of the optimized Z-scheme AgI/Ce-2MI composites in photocatalytic reduction of Cr(VI) in water within 75 min could exceed 90%. The reduction rate of AgI/Ce-2MI to Cr(VI) was 0.0277 min −1 , which was 2.6 times and 6.8 times that of AgI and Ce-2MI, respectively. In addition, the cycle performance of AgI/Ce-2MI under different pH conditions was compared, and it was found that under the condition of pH= 2, its five-time catalytic activity stability showed good performance. Moreover, the enhancement process of reactive oxygen species •O 2 - and •OH were further verified by active radical capture experiment and ESR. Therefore, this study can provide a Z-scheme heterojunction nanocomposite photocatalytic process with environmental purification functions.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 98
·期 2
·506-515
·
IF 3.709
Cao Shuang,Zhang Haixiang,Wang Xueman,Peng Miquan,Huang Renhua,Hong Wei,Fu Hailu,Chen Xiongbo,Lin Zejian
In SCR denitrification technology, the conventional coprecipitation method has the disadvantages of high temperature and difficulty in controlling the precipitation rate. Various Ce x CuTiO 2 catalysts were synthesized using ice-melting (Ce x CuTi-Ice) and conventional coprecipitation (Ce x CuTi-Con) methods for the selective catalytic reduction (SCR) of NO with NH 3 . Ce 0.4 CuTi-Ice catalyst exhibited excellent catalytic activity among the Ce x CuTiO 2 catalysts, and 80% NO x conversion was achieved within a temperature range of 250–375 °C, exceeding that of Ce 0.4 CuTi-Con catalyst by 20%; in addition, N 2 selectivity was nearly 100%. To elucidate the release characteristics of the precursor solution during ice-melting synthesis, the changes of Cu and Ce concentrations in the solution were investigated by ICP-OES. The precursor solution was released at a slow rate via the ice-melting method, resulting in a large surface area, small crystallite sizes, and effective uniform nanoparticles with abundant active species and increased surface acidity. The promoted mechanism could be attributed to the enhanced oxidation of NO to NO 2 at low temperatures and the rapid reaction between NO species and coordinated NH 3 at high temperatures. © 2022 Society of Chemical Industry (SCI).
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Materials
·
2022
·Vol. 15
·期 19
·6553
·
IF 3.748
Yuan Zhao,Tian Liang,Pengpai Miao,Tao Chen,Xiaobing Han,Guowen Hu,Jie Gao
The modification of polymers can significantly improve the ability to remove rare earth ions from wastewater, but so far few studies have focused on the irradiation-induced grafting method. In this study, a novel magnetic chelating resin for Ce(III) uptake was first synthesized by suspension polymerization of PMMA@Fe3O4microspheres followed by irradiation-induced grafting of glycidyl methacrylate (GMA) and subsequent amination with polyethyleneimine (PEI). The FT-IR, SEM, TG and XRD characterization confirmed that we had successfully fabricated magnetic PMMA-PGMA-PEI microspheres with a well-defined structure and good thermal stability. The obtained adsorbent exhibited a satisfactory uptake capacity of 189.81 mg/g for Ce(III) at 318.15 K and an initial pH = 6.0. Additionally, the impact of the absorbed dose and GMA monomer concentration, pH, adsorbent dosage, contact time and initial concentration were thoroughly examined. The pseudo-second order and Langmuir models were able to describe the kinetics and isotherms of the adsorption process well. In addition, the thermodynamic data indicated that the uptake process was spontaneous and endothermic. Altogether, this research enriched the Ce(III) trapping agent and provided a new method for the removal rare earth pollutants.Keywords:magnetic PMMA microspheres;PEI;radiation induced grafting;Ce(III) adsorption
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CHEMOSPHERE
·
2022
·
IF 8.943
Mingyong Wang,Taiguang Li,Qingzheng Hou,Yongmei Hao,Zhongming Wang
In this work, Co and Ce doped TiO 2 (CoCeTi) with low content of Co and Ce was successfully prepared by a facile one-step sol-gel solvothermal process for activating Peroxymonosulfate (PMS) to degrade Polycyclic aromatic hydrocarbons (PAHs). The phenanthrene degradation rate was 98.2% effectively in 15 min by CoCeTi (50.0 mg/L) activation PMS (0.50 mmol/L) under visible light. S O 4 • − , O 2 • – , h + and 1 O 2 were verified as the dominant reactive species for PAHs degradation. The collective effect of CoCeTi, PMS and visible light irradiation has been discussed. The possible phenanthrene degradation pathway was proposed through intermediates analysis. CoCeTi composed of Co 3 O 4 , CeO 2 and TiO 2 was confirmed. Outstandingly, CoCeTi/PMS/visible light system has very low cobalt (0.036 mg/L) and cerium (0.27 mg/L) leaching. Due to CoCeTi having good activated PMS properties and other excellent characteristics, it has potential application for PAHs or other organic pollutants degradation .
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 41
·19927-19939
·
IF 3.925
Xiangcheng Shan,Liyu Yang,Huarong Yang,Guilin Song,Zuoyi Xiao,Chang-sik Ha,Shangru Zhai,Qingda An
The eutrophication of water bodies caused by excessive phosphate discharge has always been a hotspot issue that needs to be addressed urgently. However, the fabrication of a practical capturer with high phosphate affinity remains a challenging task. In this work, a novel type of composite adsorbent (D301-Ce+) was synthesized, aiming for efficient and selective phosphate capture from wastewater. Characterizations including FTIR spectroscopy, XRD, and SEM confirmed the successful synthesis of the composites with multiple functionalities. It was shown that the maximum phosphate adsorption capacity of D301-Ce+ was 246.74 mg P g−1 because of the porous matrix of the weak basic anion exchange resin of D301 jointly modified with cerium and cationic polymeric layers. Adsorption kinetics and thermodynamics experiments confirmed that the intra-particle diffusion dominated phosphate adsorption, and the process was spontaneously endothermic naturally. Recycling studies indicated that this newly fabricated sorbent behaved with excellent reusability. Most importantly, in the presence of coexisting anions (Cl−, NO3−, SO42−, and HCO3−), D301-Ce+ exhibited a strong selectivity for phosphate, which could be attributed to the high affinity of the cerium component toward phosphate. For practical purposes, fixed-bed column experiments demonstrated that the Thomas model fitted the parameters better. By virtue of component optimization and sorption testing, the capturing mechanism could be fully described as electrostatic attraction and inner-sphere complexation.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Jianan Wang,Xueyang Wang,Min Wang,Qinghua Bian,Jiangchun Zhong
Cerium, as a lanthanide, has attracted considerable interest because of its excellent catalytic activity. Here, we propose a novel cerium-based coordination polymer nanoparticles named DPA–Ce–GMP, which have excellent oxidase-mimicking properties. Furthermore, a colorimetric probe that can act as an inhibitor to suppress the activity of acetylcholinesterase (AChE) was developed for detecting organophosphorus pesticides (OPs). DPA–Ce–GMP catalyzes colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a blue color, and AChE catalyzes acetylthiocholine to produce thiocholine (TCh), which can weaken DPA–Ce–GMP-catalyzed TMB. After the addition of OPs, the enzymatic activity of AChE was inhibited to produce less amount of TCh, resulting in more DPA–Ce–GMP-catalyst oxidized TMB to show an increasing blue color. Dichlorvos, as the samples, with the limit of 0.024 μg/L. Overall, we believe that the colorimetric probe can be used for the rapid, low-cost, and large-scale field detection of OPs in food samples.
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Nanomaterials
·
2022
·Vol. 12
·期 8
·1382
·
IF 5.719
Qi Zeng,Chu-Ya Wang,Bo-Xing Xu,Jianyu Han,Xin Fang,Guangcan Zhu
Bismuth oxybromide (BiOBr), with its special layered structure, is known to have potential as a visible-light-driven photocatalyst. However, the rapid recombination and short lifetime of the photogenerated carriers of BiOBr restrict its photocatalytic efficiency for the degradation of organic pollutants. Given the similar ionic size of Ce and Bi, Ce atoms might be easily introduced into the crystal of BiOBr to tailor its band structure. In this study, Ce doped BiOBr (Ce-BiOBr) samples with different percentages of Ce contents were prepared via a hydrothermal method. The intrinsic photocatalytic efficiency of Ce0.2-BiOBr for the degradation of bisphenol A (BPA) was 3.66 times higher than that of pristine BiOBr under visible light irradiation. The mechanism of Ce-doping modification for the enhanced photocatalytic performance was demonstrated based on a series of experiments and DFT calculation. The narrowed bandgap, the enhanced charge separation efficiency and Ce-doping energy level contributed to the remarkable photocatalytic performance of Ce-BiOBr.Keywords:bismuth oxybromide (BiOBr);Ce-doping modification;doping energy level;visible light;bisphenol A (BPA)
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APPLIED ENERGY
·
2022
·
IF 11.446
Xianyao Yan,Yingjie Li,Chaoying Sun,Chunxiao Zhang,Liguo Yang,Xiaoxu Fan,Leizhe Chu
The sorption-enhanced steam gasification of biomass (SESGB) using CaO-based materials is considered as a promising method for H 2 production. Ca-Al-Ce material has been reported as a good bi-functional material in SESGB process. Red mud is a solid waste in aluminium industry with large yield, which is rich in Fe 2 O 3 . In this work, a red mud-doped Ca-Al-Ce bi-functional material was prepared by wet-mechanical mixing method for H 2 production from SESGB. The CO 2 capture, H 2 production, and tar reduction performances during SESGB process using the red mud-doped Ca-Al-Ce bi-functional material were studied. The results show that the optimum addition amount of red mud in the bi-functional material is 5 wt%. After 20 SESGB cycles, the H 2 concentration using the red mud-doped Ca-Al-Ce material achieves 65.1 vol%, which is 82.4% higher than that using Ca-Al-Ce material. Besides, with the addition of red mud in the bi-functional material, the tar, residue char yields and CO 2 concentration decrease by 25.2%, 8.6% and 52.2%, respectively. Fe 2 O 3 in the red mud reacts with CaO to form Ca 2 Fe 2 O 5 in the 1st cycle, and Ca 2 Fe 2 O 5 is stable during 20 cycles, which is beneficial for the generation of oxygen vacancy. The oxidation states of Fe species in the material increase with the number of SESGB cycles, thus the catalytic effects on water gas shift reaction and tar reduction are promoted. The red mud addition is the key factor that results in high H 2 production, CO 2 capture and tar reduction performances, so the red mud-doped Ca-Al-Ce material appears promising for SESGB.
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