ACS Omega
·
2025
·
IF 4.3
Xiaoyan Wang,Xiao Wang,Wanke Chen,Jing Yuan,Qianfeng Zhang
In this study, straw biochar (TB) was prepared by pyrolysis at 500 °C, and biochar composite material (TBS) was prepared by a 1:4 mass ratio with sludge (TS). Scanning electron microscopy and Fourier transform infrared spectroscopy were utilized to characterize the material before and after adsorption. The results demonstrated that TBS possesses significant pore structure characteristics and abundant active functional groups such as hydroxyl, carboxyl, and carbonyl groups, providing a structural basis for its efficient adsorption of heavy metal ions in aqueous solutions. The adsorption performance of the remediation materials for Cu(II) and Pb(II) in aqueous solution was systematically investigated. Experimental data showed that TBS achieved maximum adsorption capacities of 60.86 and 46.98 mg/g for Cu(II) and Pb(II) at equilibrium, respectively, exhibiting superior adsorption efficiency. Through fitting analysis using adsorption kinetic models and isothermal adsorption models, it was found that the pseudo-second-order kinetic model and Freundlich isothermal model could more accurately describe the adsorption process of the two heavy metal ions, indicating that chemical adsorption was the dominant mechanism and characterized by multilayer adsorption. Thermodynamic parameter calculations revealed negative ΔG values and positive ΔH and ΔS values, suggesting that the adsorption process was a spontaneous, entropy-increasing, and endothermic reaction. These research results fully validate the excellent removal capabilities of TBS for Cu(II) and Pb(II). This study has shown that TBS can be considered a promising and cost-effective adsorbent, demonstrating its potential to adsorb heavy metal ions in water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yimeng Song,Donghui Yang,Shengnan Yu,Xinsheng Teng,Ze Chang,Fusheng Pan,Xianhe Bu,Zhongyi Jiang,Baoyi Wang,Sheng Wang,Xingzhong Cao
Tailoring the interface between the polymer matrix and filler to probe the structure-performance relationship is one of the critical research issues in hybrid membranes. In this study, metal organic framework (MOF) incorporated hybrid membranes are fabricated with polydimethylsiloxane (PDMS) as the matrix and Cu(II) loaded UiO-67-bpydc (bpydc refers to 2,2′-bipyridine-5,5′-dicarboxylic acid) as the filler, which are utilized for removing thiophene from model gasoline. The structure-performance relationship of the resultant membranes was investigated. The flux of the hybrid membrane shows a remarkable increase while avoiding obvious loss of selectivity. The loading of Cu(II) onto UiO-67-bpydc effectively tailors the interface between the polymer matrix and filler, which enhances the membrane separation performance. This study may offer a new example for designing MOF-based hybrid membranes towards efficient molecular separation.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2016
·
IF 4.312
Xuesong Liu,Xiaodong Wu,Duan Weng,Zhichun Si,Rui Ran
Cu-modified SAPO-34 molecular sieves with different Cu loading amounts were prepared by ion-exchange and impregnation methods. Both series of catalysts were hydrothermally treated at 750 °C in 10 vol% H 2 O/air for 24 h. The catalysts were characterized by inductively coupled plasma optical emission spectrometry (ICP-OES), electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), H 2 temperature-programmed reduction (H 2 -TPR), NH 3 temperature-programmed desorption (NH 3 -TPD) and diffused reflectance infrared flourier transform spectroscopy (DRIFTS). All the fresh catalysts show high activity toward the selective catalytic reduction of NO x with NH 3 (NH 3 -SCR) at low temperatures regardless of preparation method. Generally, the hydrothermal aging shifts the operation window of the catalysts towards high temperatures. The improvement in high-temperatures activity is attributed to the migration of surface CuO clusters into the ion-exchanged sites as isolated Cu 2+ during ageing, which suppresses the competitive oxidation of NH 3 . The loss of low-temperatures activity is also related to the decrease in the amount of active surface CuO clusters, inhibiting the oxidation of NO to NO 2 and fast SCR reaction. Interestingly, the amount of Lewis acid sites increase linearly with the increasing isolated Cu 2+ , while the Brønsted acidity is weakened.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2013
·
IF 1.164
Xiaochun Chen,Shuimin Ming,Xinying Wu,Chang Chen,Charles Asumana,Guangren Yu
The absorption of propylene and propane in Cu(I)-based ionic liquids, i.e., 1-butyl-3-methylimidazolium chloride/CuCl ([Bmim][Cl]/CuCl), N-Methyl pyrrolidone chloride/CuCl ([HNMP][Cl]/CuCl), and tricaprylmethylammonium thiocyanate/CuSCN ([A336][SCN]/CuSCN), are investigated in this work. It is observed that such Cu(I)-based ionic liquids, especially Bmim-based ionic liquids, present good absorption capability for propylene and good selectivity over propane, e.g., 1.0 kilogram [Bmim][Cl]/CuCl is able to absorb 0.08 mol propylene while only 0.006 mol propane at 25°C and 1.3 bar with the selectivity of 13. The effects of pressure, Cu+ concentration, and temperature on the absorption are investigated; in addition, the absorption kinetics of propylene by [Bmim][Cl]/CuCl is obtained. The much higher absorption capability for propylene than propane is ascribed to the π-complexation between propylene and Cu+. This work shows that the absorption by Cu(I)-based ionic liquids is an potential alternative method for traditional cryogenic distillation with high energy cost to separate propylene and propane.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2019
·
IF 0
Ge Li,Baodong Wang,Qi Sun,Wayne Qiang Xu,Ziran Ma,Hongyan Wang,Daojun Zhang,Jiali Zhou
A combined acid–alkali hydrothermal method was used to prepare fly ash –derived SAPO-34 molecular sieves from a thermal power plant in Inner Mongolia (China). The specific surface area of the prepared fly-ash-derived SAPO-34 molecular sieves was 579 m 2 g −1 , the total pore volume was about 0.27 cm 3 g −1 , and the pore size was 0.56 nm; the molar ratios of Al 2 O 3 :P 2 O 5 :SiO 2 were 1:0.86:0.45. Cu/SAPO-34 catalysts were prepared by impregnation of low-cost fly-ash-derived SAPO-34 molecular sieves as a support and tested in selective catalytic reduction with NH 3 (NH 3 -SCR). Powder X-ray diffraction (XRD), N 2 adsorption–desorption, X-ray photoelectron spectroscopy (XPS), H 2 temperature-programmed reduction (H 2 -TPR), NH 3 temperature-programmed desorption (NH 3 -TPD), electron paramagnetic resonance (EPR), nuclear magnetic resonance (NMR), X-ray fluorescence analysis (XRF) and scanning electron microscopy (SEM) were used for catalyst characterization and investigation of the relationships between the catalyst structure and the catalytic activity. The actual silica:alumina ratio of the molecular sieves did not increase with increasing Cu loading, indicating that increasing the Cu loading does not change the original structure of the SAPO-34 molecular sieves. The XRF and NMR results showed that replacement by Cu results in more Si islands. The molecular sieve acidity decreased because of the increased number of Si islands. The NH 3 -TPD results showed that for the Cu/SAPO-34 catalysts there was a low correlation between the low-temperature activity and the amount of acidic sites. SCR activity is closely related to the location of Cu. The 4.47Cu/SAPO-34 catalyst has the highest isolated Cu 2+ showed the highest NH 3 -SCR activities (> 90%) at 250–350 °C. This work opens up new avenues for recycling fly ash formed in coal-fired power plants (reducing environmental pollution) and developing low-cost SCR catalysts for NO x pollution control.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
Chem Catalysis
·
2022
·
IF 0
Wenjie Wu,Yulu Yang,Yitong Wang,Tiantian Lu,Qingsong Dong,Junwei Zhao,Jingyang Niu,Qingchao Liu,Zhaomin Hao,Shuyan Song
Electrosynthesis of urea from N 2 and CO 2 molecules is of immense significance but has so far been plagued by the lack of a universal design principle to guide the search for new catalysts. Herein, as exemplified by the Cu-Bi catalyst, our findings revealed that the defective Cu-Bi catalyst could offer a maximum urea concentration of 0.45 ± 0.06 mg L −1 and the largest faradaic efficiency of 8.7% ± 1.7% at −0.4 V (versus reversible hydrogen electrode [RHE]), exhibiting outstanding activity in contrast to monometallic (Cu and Bi) and bimetallic (Cu-Bi mixture and intact Cu-Bi) catalysts. Moreover, the evidence from isotope tracing experiments, in situ Raman spectroscopy, and density functional theory (DFT) calculations suggested that it is a promising strategy for the co-reduction of N 2 and CO 2 by defective Cu-Bi catalysts, switching on a light to the application of defects in electrosynthesis of urea.
研究领域:
化学工程
·
材料科学
·
催化反应
✓ 已验证
DOI
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 42
·23817-23827
·
IF 12.732
Manman Feng,Xuemei Wu,Huiyuan Cheng,Zihao Fan,Xiangcun Li,Fujun Cui,Shuai Fan,Yan Dai,Guangping Lei,Gaohong He
The diatomic catalysts (DACs) provide a new strategy for efficient catalysis of CO2 reduction reaction (CO2RR) owing to their maximum atomic utility and more flexible active sites. However, it is still challenging to precisely design heteronuclear diatomic active centers and understand the coordination mechanism of binary sites at the atomic level. Herein, a nitrogen-doped carbon matrix with precisely controlled Fe–Cu diatom sites is synthesized through a metal–organic framework. The as-obtained Fe/Cu–N–C catalyst exhibits an excellent CO faradaic efficiency (>95% over a wide potential range of −0.4 to −1.1 V vs. RHE, 99.2% at −0.8 V vs. RHE), a high turnover frequency (5047 h−1 at −1.1 V vs. RHE), and a low overpotential (50 mV), thus outperforming most reported atomically dispersed catalysts. Further density functional theory calculations indicate that the synergy between Fe–Cu diatoms causes rapid charge transfer and effectively adjusts the position of the d-band center, which reduces the energy barriers for *COOH formation and *CO desorption. This work provides a new approach for advancing universal synthesis strategies to construct heteronuclear diatomic catalysts and explore synergistic effects.
研究领域:
材料科学
·
催化化学
·
能源转换
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Minglei Lu,Zhuoyu Zheng,Weiwei Lu,Haiping Zhu,Junwei Liao,Yuxin Ge,Xueer Huang,Qian Zhang,Jiajin Li,Yiyuan Zhou,Xiaoping Wu,Baozhu Chen,Chunxiao Yang,Xitang Qian,Minhua Shao,Tiejun Wang
Aqueous-phase reforming of methanol represents a promising avenue for hydrogen (H2) production. However, developing highly efficient and low-cost nonprecious catalysts remains challenging. Here, we report the synthesis of Cu-based catalysts with Cu, Cu2O, and CuN3 nanoparticles anchored on the nitrogen-doped carbon, forming Cu0/Cu+/Cu-N3 active sites. This catalyst achieves a H2 production rate of 140.1 μmol/gcat/s at 210 °C, which is several times to 2 orders of magnitude higher than that of Cu-, Ni-, even Pt-based catalysts, demonstrating excellent long-term stability over 350 h at 210 °C. A mechanism investigation reveals that the Cu-N3 site facilitates water dissociation into *OH and improves *CO and *OH conversion, leading to enhanced CO conversion and H2 production kinetics.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Physics
·
2022
·
IF 11.021
X. Li,Z. Wang,J. Zhang,K. Dai,K. Fan,G. Dawson
The solar driven reduction of carbon dioxide (CO 2 ) to high value-added carbon based fuel is a promising solution to mitidate climate and energy problems, however, improving the adsorption and conversion efficiency of CO 2 in the photoreduction process still faces severe challenges. In this work, Cd 0·7 Zn 0·3 Se solid solution was prepared by cation exchange: selenium (Se) vacancies are produced during ion exchange, which promotes the unsaturated coordination of the surrounding metal atoms. The adsorption of diethylenetriamine (DETA) on the surface limits the growth of Cd x Zn 1- x Se crystallites , resulting in insufficient coordination of the surface atoms, which then become active adsorption sites. Furthermore, a heterojunction was formed with Cu 2 O@Cu to accelerate the separation and transfer of photo-induced carriers of Cd 0·7 Zn 0·3 Se, and the optimized Cd 0·7 Zn 0·3 Se/Cu 2 O@Cu (CZS/CC) step-scheme heterojunction exhibited a CO release activity of 50.5 μmol g −1 h −1 , which is 3.8 and 10.7 times higher than that of Cd 0·7 Zn 0·3 Se and Cu 2 O@Cu, respectively. This work is expected to open up new insight for the regulation of nanostructures and the design of selective catalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Huijuan Chen,Fangrui Gao,Wenbin Ren,Lulu Du,Kaifeng Xue,Pinhua Zhang,Changmin Shi,Li Lv,Guangliang Cui
Ultra-sensitive hydrogen sulfide (H 2 S) detection technology at low temperatures provides critical support for the application of one-time alert systems under extreme conditions, ensuring reliable monitoring of H 2 S in low-temperature environments and enhancing safety and practicability. In this study, we developed a novel low-temperature H 2 S sensor based on Cu/Cu 2 O nanoarrays, prepared through a combination of 2D electrodeposition in situ assembly and the hydrothermal method. The heterointerface between Cu nanowires and Cu 2 O nanocubes presents a high barrier, which can be modulated to zero through the formation of continuous Cu x S conductive channels via the vulcanization reaction, thereby achieving excellent sensitivity and selectivity towards H 2 S at low temperatures. At freezing temperatures and low H 2 S concentrations (≤20 ppm), the sensors show ideal recovery and reasonable sensitivity (R=150 to 10 ppm H 2 S at 0 °C). However, the response significantly increases (R=5624 at 10 ppm H 2 S at 50 °C) and recovery is lost under reversed conditions. First-principles calculations have confirmed that the enhanced H 2 S adsorption at the heterointerface is the primary reason for the robust response observed at 0 °C. Experimental results demonstrate that the Cu/Cu 2 O nanoarrays were capable of rapid detection of H 2 S at low temperatures through modulation of heterointerface barriers.
研究领域:
材料科学
·
化学传感器
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2018
·
IF 2.746
Bingru Liu,Xiaohua Li,Sumin Liu,Xu Hun
In this work, a chemiluminescence (CL) aptasensor was designed for detection of microcystin-RR (MC-RR) by introducing Cu/Co nanorods acting as CL catalyzer. Cu/Co nanorods were firstly synthesized throughout a hydrothermal method . Then the thiolated MC-RR aptamer was immobilized on the surface of Cu/Co nanorods, which was employed for recognizing of MC-RR target. In the presence of MC-RR, the conformational change of MC-RR aptamer was happened via recognizing between MC-RR and its aptamer. The luminol CL was catalyzed by Cu/Co nanorods that influenced by conformational change of MC-RR aptamer. The formed MC-RR/aptamer composite prevented the diffusion channel of luminol substrate toward the Cu/Co nanorods surface and restrained the Cu/Co nanorods catalyzing luminol CL. And the intensity of CL depended on the concentration of MC-RR. Under optimal condition, the CL aptasensor had a linear range in 0.1 to 70 nM and a low detection limit of 3.3 × 10 −11 M for MC-RR. This study provided a significant method for MC-RR detection in real samples with excellent selectivity.
研究领域:
分析化学
·
环境科学
·
生物传感技术
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2018
·
IF 0.367
Yifei Xiao,Xue Jin,Li Zhang,Huan Luo,Junfeng Li
Cu-doped cerium oxides were successfully prepared by nitrate combustion method. The crysatlline phase evolution, micro morphology and photocatalytic performance of the products are systematically studied by XRD, SEM/EDX and degradation rate of methylene blue. The results show that at relative low temperature (<600°C), 20 mol% copper can be dissolved into CeO2 fluorite type cubic structure, however, at high temperature of 700°C, CuO phase desolution from CeO2 solid solution is detected by XRD, and confirmed by DTA for 5% Cu-doped sample. The as prepared photocatalysts show agglomeration of ultra fine particles with porous structure. Degradation results of methylene blue indicate that better photocatalytic performance is obtained for 5% Cu-doped CeO2 under the stimulated visible light than UV light irradiation (both 254 nm and 365 nm), even the power of former is half of the later. The loss of photocatalytic activity for higher doping samples (>5% Cu) is believed to be the serious agglomeration of the particles and desolution of CuO from CeO2 solid solution.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）