Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Qinglian Sun,Sheng Huang,Zaoyuan Li,Donghua Su,Jinfei Sun
Metal-organic frameworks (MOFs) effectively remove hazardous contaminants and are widely used for wastewater treatment . In this work, Co-doped bimetallic MIL-88B(Fe/Co) was synthesized via the hydrothermal method to activate potassium persulfate (KPS) for methylene blue (MB) degradation. XRD , IR, XPS, and SEM were conducted to investigate the crystalline structure, chemical valence state, and morphology of MIL-88B(Fe/Co). The synthesis time and Fe 3 + /Co 2 + molar ratio were optimized. Results showed that 10% Co-doped MIL-88B(Fe/Co) could efficiently activate KPS to achieve 100% MB removal in 15 min, thereby indicating that Co 2 + could accelerate metal-to-metal charge transfer during activation. A quadratic model was established by fitting the experimental data to optimize the degradation parameters. The reaction system with a temperature of 70 °C, KPS concentration of 30 mM, MOFs concentration of 0.8 g/L, and initial pH of 10 could effectively remove 99.85% MB in 5 min. Quenching experiments and EPR analysis revealed that·OH, 1 O 2 , and·O 2 − were the dominant reactive oxygen species (ROS) during MB degradation. The active sites (N15, N7, S10, and N18) most vulnerable to ROS attack in MB were identified by DFT calculation. MB degradation intermediates were identified through MALDI.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Sheng Liu,Yujuan Guo,Shunmin Yi,Shijing Yan,Chaoliu Ouyang,Fei Deng,Chunxue Li,Guangfu Liao,Qing Li
Supported noble metal heterogeneous catalysts have been proven to be effective for the treatment of toxic organic pollutants. Herein, ultrafine Ag nanoparticles (NPs) with an average size of approximately 4.37 nm was decorated on the surface of pure silicon zeolite nanoparticle (PSZN) and confined in pore channels through a low-cost and environmentally friendly in-situ reduction strategy. The prepared Ag/PSZN nanocomposites showed ultrahigh catalytic activity for the reduction of 4-nitrophenol (4-NP) (∼200 s, 17.29 × 10 -3 s −1 ) and methylene blue (MB) (∼4 min, 76.53 × 10 -2 min −1 ), which outperforms the majority of the previously reported Ag-based catalysts. The excellent catalytic performance is due to the large loading amount (W t = 16.8 %) and ultrasmall size of Ag NPs, which provides abundant active sites. Moreover, it showed outstanding recyclability of 93 % and 86 % removal of 4-NP and MB, respectively, after 10 cycle reactions, and stability after 300 days of storage at room temperature. This work offers new insights into the fabrication of Ag-based catalysts for efficiently removing organic pollutants from aqueous solutions.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Shi Zhou,Jing Yin,Qiang Ma,Baikerouzi Baihetiyaer,Jiaxue Sun,Ya Zhang,Yanji Jiang,Jun Wang,Xianqiang Yin
In this study, a type of montmorillonite-reduced graphene oxide aerogel (M−rGO) was successfully prepared by the sol–gel method and used for the effective removal of heavy metals (cadmium, Cd) and cationic dyes (methylene blue, MB) in wastewater. The chemical composition and micromorphology of the resulting M−rGO were characterized utilizing scanning electron microscopy and energy dispersive spectrometry, Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, and X-ray diffraction. Furthermore, the effects of the initial concentration, adsorption time, and temperature on the static adsorption process were systematically studied. Equally important, the effects of the concentration, pH, ionic strength (IS), and pumping flow rate of contaminated solution on the dynamic removal of Cd and MB by M−rGO were investigated by a fixed-bed column experiment. The kinetics, isothermals, and thermodynamic adsorption experiment results showed that the Langmuir and pseudosecond-order models best suited the adsorption process in which physical adsorption and chemical adsorption act together. Functional groups containing O and C were involved in the adsorption of Cd and MB, and the hydrogen bonds, π-π, n-π interaction, and hydrophobic interaction between M−rGO and MB made important contributions to adsorption. The lower initial concentration, higher pH value, and slower pumping flow rate of the contaminated solution can effectively increase the dynamic adsorption capacity of Cd and MB on M−rGO. Contrary to that of Cd, the adsorption capacity of MB on M−rGO increased with IS. Both static adsorption and dynamic column experiments confirmed that the presence of Cd promoted the adsorption of MB, and MB inhibited the adsorption of Cd by M−rGO. In addition, the Cd/MB combined pollution wastewater experiment and the regeneration study showed that M−rGO could be a cost-effective and promising sorbent for Cd and MB wastewater treatment due to its high efficiency and excellent reusability.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 30
·期 11
·4605-4618
·
IF 4.705
Chen Kewei,Li Yanhui,Wang Mingzhen,Cui Mingfei,Du Qiuju,Xu Wenshuo,Li Liubo,Chen Bing,Sun Yaohui,Zhang Yang
In this study, composite hydrogels were prepared by a simple synthetic technique to adsorb methylene blue from water. The hydrogel was composed of polyacrylamide (PAM) as the carrier, grafted with pullulan polysaccharide, and modified with graphene oxide. The morphology and properties of PUL/PAM/GO composites were characterized by Thermogravimetric Analysis (TGA), Fourier Transform Infrared (FTIR) spectroscopy, and Scanning Electron Microscopy (SEM). Then, the adsorption performance of PUL/PAM/GO hydrogel for MB was researched, including the dose, temperature, contact time, pH, adsorption isotherm, adsorption kinetics, and adsorption thermodynamics and swelling properties. The effects of various salts in real wastewater on adsorption were simulated. The removal rate of MB by PUL/PAM/GO was high-speed, and the sample can remove 83.2% of the dye in 140 min. The adsorption kinetics was more consistent with pseudo-second-order reaction, and the Langmuir model was suitable for describing the adsorption process. The maximum adsorption capacity was 438.7 mg g−1. Thermodynamic parameters covered the enthalpy changes (ΔH0), free energy (ΔG0), and entropy (ΔS0), which stated that adsorption by the PUL/PAM/GO hydrogels was exothermic and spontaneous.Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhengzheng Guo,Penggang Ren,Jin Wang,Xin Hou,Jiahui Tang,Zongbin Liu,Zhengyan Chen,Yanling Jin,Fang Ren
The development of absorption-dominant electromagnetic interference (EMI) shielding materials with high-efficiency EMI shielding effectiveness (SE) and low reflection (R) is crucial but challenging for next-generation electronics devices and telecommunication. In this regard, a facile and environmentally friendly approach was proposed to fabricate N, S- co -doped TiC/carbon hybrid aerogels with hierarchically porous architecture through MXene/cellulose hybrid hydrogels as precursors for adsorbing dyes, followed by freeze drying and carbonization process. Profiting from the synergistic effect of highly interconnected three-dimensional (3D) porous structure, heterogeneous conductive network with greatly conductive difference as well as heteroatoms-doping induced dipole polarization, the resultant aerogel with an ultra-low density (47.1 mg/cm 3 ) achieves a highly efficient EMI SE of 84.3 dB at 12.4 GHz (average 81.8 dB in the X-band) and a superior absorption coefficient of 0.68 simultaneously. Meanwhile, the highly porous structure endows the prepared aerogels with outstanding thermal insulating capacity, which is essential to provide infrared stealth and radar stealth for military equipment and to protect sensitive electronic devices from high-temperature attacks. This work offers a prospective strategy for constructing high-performance absorption-dominated EMI shielding materials with excellent thermal insulation properties, and the obtained aerogels present broad application prospects in the fields of aviation, portable electronic equipment and national defense industry.
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Fenglin Tang,Jiaojiao Tang,Dan Wang,Caixia Deng,Shuang Li,Xiupei Yang
Herein, a hexagonal molybdenum trioxide/graphite carbon nitride heterojunction modified by biomass carbon dots was synthesized by a simple one-pot method and successfully applied to the degradation of methylene blue as a photocatalyst . It was confirmed that under optimal compounding conditions, graphite carbon nitride and hexagonal molybdenum trioxide combined to form a heterojunction, and the coupling interface accelerated the charge transfer efficiency. The modification of supplementary biomass carbon dots can improve the photocatalytic activity of the photocatalyst for the degradation of methylene blue. The proposed heterojunction shows better photocatalytic activity than bulk graphite carbon nitride and has good reusability and stability. After irradiation with simulated visible light for 1 h, the degradation rate of methylene blue by the heterojunction reached 67 %, which was 2.7, 2.6 and 5.8 times higher than that of bulk graphite carbon nitride, pure hexagonal molybdenum trioxide and pure carbon dots, respectively.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2023
·Vol. 63
·期 11
·3891-3905
·
IF 3.2
Junhui Si,Yuanchang Deng,Changxiong Gong,Zhixiang Cui,Qianting Wang
Deacetylated cellulose acetate/thermoplastic polyurethane@graphene oxide (DA/TPU@GO) nanofibrous membranes were prepared through the combination of electrospinning, deacetylation, and ultrasound-assisted surface treatment techniques. The morphology, wettability, and mechanical properties of composite nanofiber membranes were studied via SEM, TEM, water contact angle measurements, and mechanical tests. Moreover, the adsorption capacity and mechanism of DA/TPU@GO nanofiber membranes for methylene blue and chromium (Cr (VI)) were analyzed. The introduction of active sites from GO led to a significant increase in the adsorption capacity of the DA/TPU@GO composite membranes compared with the DA/TPU composite nanofiber. The composite membrane featured adsorption capacities of 152.7 mg/g (25°C, pH 3) and 122.1 mg/g (25°C, pH 7) for Cr (VI) and methylene blue, respectively, which are higher than most other composite GO-based adsorbents. The adsorption mechanism of the DA/TPU@GO composite membrane was consistent with the Langmuir isotherm and second-order kinetic models. Therefore, the DA/TPU@GO composite nanofiber membrane served as an effective adsorbent with broad application prospects in the sewage treatment field owing to its excellent adsorption capacity. Highlights Nanofibers were prepared for the absorption of methylene blue (MB) and Cr (VI). Nanofibers exhibited adsorption capacities of 152.7 and 122.1 mg/g for Cr (VI) and MB. Adsorption mechanism follows Langmuir isotherm and second-order kinetic models. Nanofibers have wide potential applications in sewage treatment.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Wenqiang Liu,Meng Zhou,Heqing Fu
A ternary Ag@ZnO@Ti 3 C 2 MXene heterojunction (AZM) is synthesized by hybridizing ZnO and Ag nanoparticles with the MXene via a simple hydrothermal and chemical deposition method. The addition of ZnO and Ag can effectively compensate for MXene’s narrow bandgap property, promote charge carrier separation, and improve visible light absorption , thereby enhancing photocatalytic activity. The photocatalytic activity of the AZM is evaluated through the removal efficiency of methylene blue (MB) dye and levofloxacin (LVX) under visible light irradiation. The results show that the optimized ternary AZM heterojunction photocatalysts (AZM-15) possesses the maximum degradation of MB (90.54%) with a reaction rate constant of 0.0473 min −1 , while the maximum degradation of LVX (86.76%) has a reaction rate constant of 0.0408 min −1 . Moreover, the AZM composite exhibits excellent stability, which explains its MB removal rate of 83.59% and LVX removal rate of 80.03% after five cycles. The results of trapping experiments and EPR demonstrated that the main active species in the MB and LVX photodegradation process are·OH and·O 2 - . This work not only elucidates a possible mechanism of photocatalytic degradation of organic pollutants but also provides a pathway to design new bandgap photocatalysts for mitigating environmental pollution .
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Jianke Tang,Rongqian Meng,Yanfeng Xue,Shengjian Zhang,Qiaoling Li
A novel Ag 3 PO 4 /WO 3 ·H 2 O composite was prepared by loading Ag 3 PO 4 on WO 3 ·H 2 O substrate via a two-step hydrothermal method and characterized by various analytical techniques. The photocatalytic performance was evaluated by the degradation of methylene blue (MB) and oxytetracycline (OTC) under visible light irradiation. Within 30 min, 98.9 % MB can be degraded by the Ag 3 PO 4 /WO 3 ·H 2 O composite with a molar ratio of 3:1 (3Ag/1W), which is higher than that of individual Ag 3 PO 4 and WO 3 ·H 2 O. The 3Ag/1W photocatalyst also exhibits improved photocatalytic activity for OTC degradation than pure WO 3 ·H 2 O and Ag 3 PO 4 . The improvement of photocatalytic activity would be mainly ascribed to the highly efficient separation of photo-induced electron-hole pairs due to matched band structure, as confirmed by photoluminescence spectra (PL) and photocurrent responses test. According to the experimental results of radical trapping and electron spin resonance (ESR), a possible photocatalytic mechanism of the Ag 3 PO 4 /WO 3 ·H 2 O composite was proposed.
✓ 已验证
产品关联
DOI
高影响因子
CLAYS AND CLAY MINERALS
·
2019
·Vol. 67
·期 4
·253-264
·
IF 1.835
Xu Minhong,Qian Mengxia,Pan Guoxiang,Guo Yuhua,Wu Tao
Photocatalytic degradation of polluted water by means of minerals, such as clays and oxides, which have surfaces that exhibit catalytic properties, has been suggested to be a useful new strategy to promote both organic and inorganic pollutant degradation. Nevertheless, much still remains to be studied about the capability of mixed metal oxides derived from lanthanum-containing layered double hydroxides to promote pollutant removal by means of photocatalytic degradation with the mineral surfaces. The objective of the present study was to investigate the synthesis of ternary MgAlLa mixed-metal oxides (MgAlLa-M) with various Mg/Al/La molar ratios through a hydrotalcite-like precursor route by co-precipitation of appropriate amounts of metal salts from homogeneous solution, followed by calcination at 600°C. The crystal structure, surface morphology, and optical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and UV-Vis diffuse reflectance spectroscopy (DRS). Analysis by XRD showed that MgO, La 2 O 3 , MgAl 2 O 4 , and La 10 Al 4 O 21 phases coexisted in calcined samples as MgAlLa-M. The samples showed a small band gap of 3.11–3.35 eV according to DRS. The photocatalytic activities of the samples were evaluated by degradation of methylene blue (MB) under visible light irradiation. MgAlLa-M had better photocatalytic properties than hydrotalcite precursors, and the MgAlLa-0.5-M possessed the best photocatalytic activity. The photocatalytic degradation efficiency of MB dye with MgAlLa-0.5-M under visible light irradiation for 1 h was 99.89% in the presence of H 2 O 2 , which exceeded the binary MgAl-M (84.06%) under the same conditions. The high photocatalytic activity of the sample was attributed to the addition of La(III). In addition, the possible mechanism of photocatalytic degradation of MB by MgAlLa-M was discussed. The results showed that •O 2 – plays a major role in the MgAlLa-0.5-M/H 2 O 2 system.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yangqing He,Zhengrui Huang,Zhanying Ma,Binghua Yao,Haiyang Liu,Linlin Hu,Qing Zhao,Qian Yang,Dongjie Liu,Deguo Du
In this study, zinc (II) 1, 8(11),15(18),22(25) - tetrakis (4-carboxylphenoxy) phthalocyanine (α-ZnTcPc) was synthesized as sensitizer to construct a novel photocatalyst α-ZnTcPc/g-C 3 N 4 by a polycondensation strategy. The FT-IR and XPS spectra demonstrated that the α-ZnTcPc molecules were covalently coupled on g-C 3 N 4 . The 10%α-ZnTcPc/g-C 3 N 4 composites exhibit excellent extended spectral response with intense broad near-infrared absorption at 695 nm and with significantly fascinated charge carrier separation. As expected, the 10%α-ZnTcPc/g-C 3 N 4 displayed a remarkable improved photocatalytic performance in decomposition of methylene blue (MB) and antibiotic tetracycline with degradation rates of 94.49% and 91.43% under visible light irradiation, respectively. The hydroxyl radicals (·OH) were observed as the main reactive oxidizing species in tetracycline decomposition. Moreover, the possible mechanism for enhanced visible light photocatalytic capability might be ascribed to the synergetic effect between α-ZnTcPc and g-C 3 N 4 , which creates large surface areas, decreases the recombination rate of photogenerated charge carries, as well as improves the visible light harvesting significantly. This work not only presents a practical method to conquer the drawback of pure g-C 3 N 4 , but also provides useful insights to construct other g-C 3 N 4 -based composites to take full advantage of solar light towards practical applications for eliminating recalcitrant organic pollutants.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zijin Wang,Jun Wang,Yining Pan,Fangyang Liu,Yanqing Lai,Jie Li,Liangxing Jiang
A novel magnetic InVO 4 /ZnFe 2 O 4 composite with the synergistic effect of adsorption and photocatalytic activity has been prepared using a hydrothermal method and characterized by a series of analytical techniques. The addition of ZnFe 2 O 4 not only improves the adsorption capability in the case of more active sites and positive zeta potential but also broadens the absorption range and promotes visible light harvesting. The optimum activity was found at a mole ratio of ZnFe 2 O 4 :InVO 4 = 3:1 (IZ-4). The removal rate for methylene blue (MB) under the synergistic effect of adsorption and photocatalytic reaches 88.74%, which is 6.87 times and 14.11 times that of the pure InVO 4 and ZnFe 2 O 4 , respectively. Furthermore, the adsorption kinetics and isotherm investigations indicate that the adsorption process followed the pseudo-second-order kinetic and Langmuir isotherm models. The maximum adsorption capacity of MB as 97.12 mg/g is achieved on the IZ-4 composite, which is better than the adsorbents reported previously. A type-II heterojunction between InVO 4 and ZnFe 2 O 4 based on the results of Mott-Schottky (M-S) plots is proposed to facilitate the charge transfer and improve the photocatalytic activity. In terms of the experimental results of N 2 adsorption/desorption, zeta potential and photoluminescence emission spectra, a possible mechanism of MB removal is discussed. The InVO 4 /ZnFe 2 O 4 composite with a synergistic effect of adsorption and photocatalytic degradation increases the active adsorption sites and promotes the separation of photogenerated electron and holes, thereby improving the MB removal performance.
✓ 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）