SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Zhuoyu Bu,Xiaoyu Li,Yan Xue,Jingya Ye,Jingyi Zhang,Yuwei Pan
This study demonstrated a fast and efficient treatment of highly salty wastewater in a hydroxylamine (HA) enhanced Fe 0 /H 2 O 2 system. The apparent rate constant ( k ) in Fe 0 -HA/H 2 O 2 system could achieve 7.9 times higher than that in Fe 0 /H 2 O 2 system using tartrazine as the target pollutant and Na 2 SO 4 as the model salt. The value of k for removing tartrazine in the salty system by Fe 0 -HA/H 2 O 2 process even 12.7 times higher than that in the conventional system which was attributed to the faster Fe 0 corrosion rate in the salty system. Meanwhile, Fe 0 -HA/H 2 O 2 process could obtain remarkable performance for highly salty wastewater treatment at wide salt concentration levels (0–0.2 M) and could also widen the application of pH to neutral pH. The characterizations by SEM and XPS, the intensity of DMPO–OH adduct signals and detection of Fe 2+ and Fe 3+ ions in different systems confirmed the good performance was owing to the faster Fe 0 corrosion rate in the salty system and acceleration of Fe 3+ /Fe 2+ recycle owing the addition of HA inducing fast catalysis of H 2 O 2 and generation of hydroxyl radicals. Moreover, the value of k for removing tartrazine in various types of salty system by Fe 0 -HA/H 2 O 2 process was 2.9–30.8 times larger than Fe 0 /H 2 O 2 process demonstrating the good suitability of Fe 0 -HA/H 2 O 2 process at various types of salty system. Therefore, this study will shed lights on the reactivity of the Fe 0 -HA/H 2 O 2 system and provide an alternative pathway for removal of salty wastewater.
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高影响因子
Nano Research
·
2021
·Vol. 14
·期 7
·2363-2371
·
IF 8.897
Lv Yan,Yue Lin,Khan Imran Mahmood,Zhou You,Cao Wenbo,Niazi Sobia,Wang Zhouping
Herein, we report the fabrication of Fe 3 O 4 @TiO 2 nanosheet/Ag/g-C 3 N 4 (Fe 3 O 4 @ns-TiO 2 /Ag/g-C 3 N 4 ) composite photocatalysts with well-designed hierarchical yolk-shell structure. To endow the composites with fascinating features, multiple functional components are perfectly integrated into the definite structure. The photodegradation experiments of organic pollutants revealed a significant enhancement in photocatalytic activity of developed composites as compared to P25, which is mainly due to the synergetic interaction of the tailored three-dimensional (3D) yolk-shell porous nanostructure, extended sunlight response range, and retarded the recombination probability of photogenerated electrons-holes. More importantly, the hybrid samples exhibited superior magnetic properties due to the magnetic component. The excellent magnetic recyclability and reusability of the photocatalysts are verified by the magnetic hysteresis loop and cyclic photocatalytic degradation experiments, which is significant for the green and sustainable applications of photocatalysts. Considering its remarkable photocatalytic performance and expectant magnetic recyclability, the composite photocatalysts are expected to be a promising candidate to dispose of future environmental issues.
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 12
·3532-3542
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IF 3.186
Mei Haotian,Wang Qi,Liu Guanhong,Zhu Xudong,Zhang Meng,Huang Kai,Lin Kuangfei
Nanoscale zero-valent iron (nZVI) supported on polymeric graphitic carbon nitride (CN) composite (nZVI@CN) was synthesized via liquid phase reduction method as peroxymonosulfate (PMS) activator, and had been achieved efficient degradation of paraxylene (PX) in this study. The physicochemical properties of nZVI@CN were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectrometer, Scanning electron microscopy and Brunauer–Emmett–Teller. The results indicated that catalyst prepared with 1:1 of nZVI and CN mass ration showed the best catalytic performance for the PX degradation. The removal efficiency of PX was 90.9% within 30 min treatment with the optimal reaction conditions (1 mM PMS, 0.1 g/L nZVI@CN, 20 mg/L PX and pH 6.86), and the mineralization rate measured by the removal of total organic carbon had reached 82.6%. Radical quenching and Electron paramagnetic resonance detection confirmed that sulfate and hydroxyl radicals generated by PMS activation were responsible for the degradation of PX, and sulfate radicals were the dominant active species. In addition, the possible reaction mechanism was proposed based on the experimental results. The nZVI@CN can not only be suitable for wide pH range (3–9) to effectively remove PX, but also has good stability and reusability. The removal efficiency of PX was higher than 60% in the fifth reuse experiment, which indicated that nZVI@CN was a stable PMS activator for efficiently PX removal in water. Graphic Abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yuanyuan Wang,Huan Wang,Zhixian Li,Dongjie Yang,Xueqing Qiu,Yechen Liu,Mengzhen Yan,Qiong Li
Lignin has been demonstrated to be green and effective for the modification of ZnO-based materials. In this work, quaternized lignin/zinc oxide nanostructured hybrid composites (QLS/ZnO NCs) were synthesized with good dispersion and uniform particle size via a facile hydrothermal method . Sodium lignosulfonate (LS) was modified by quaternization to endow the positive charges, which effectively captured bacteria due to the electrostatic interactions. Interestingly, QLS/ZnO NCs show a litchi-like morphology consisting of nanorods with diameters of 5–10 nm, which further resulted in damage to the bacterial cell membrane. Owing to the surface charge and rough surface topology for bacterial capture, QLS/ZnO NCs exhibited greatly enhanced antibacterial activity compared with bare ZnO . After being treated with QLS/ZnO NCs for 90 min, the sterilization rates of Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) reached 97.54% and 99.55%, respectively. Due to the reactive oxygen species (ROS) produced by ZnO under light irradiation, the antibacterial activity of QLS/ZnO NCs could be further enhanced. In addition, the minimal inhibition concentrations (MICs) of QLS/ZnO NCs towards E. coli and S. aureus were both 100 μg/mL, and the minimum bactericidal concentrations (MBCs) were 100 μg/mL and 200 μg/mL, respectively. Moreover, with the incorporation of QLS/ZnO NCs into polyurethane films, the composite films showed excellent antibacterial activity, strong tensile strength and enhanced ultraviolet light blocking performance.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Hailan Qin,Yushan Zhang,Shuaijun He,Zeyu Guan,Yintao Shi,Xinyi Xie,Dongsheng Xia,Dongya Li,Haiming Xu
Increasing the migration and separation efficiencies of photogenerated carriers can enormously enhance photocatalytic properties. Thus, a novel CQDs/BiOCl nanocomposite with rich oxygen vacancies (OVs) was effectively synthesized via a hydrothermal method by using maltitol as a carbon source to address these issues. The photocatalysts were characterized by XRD, SEM, TEM, FT-IR, BET, XPS, PL, EIS, I-t, DRS and ESR. The experimental results demonstrate that BOC-1 can purify 72% tetracycline hydrochloride (10 mg/L, TC-HCl) within 60 min, which is 4 times higher than pure BiOCl. Moreover, photocatalytic mechanism was thoroughly studied and verified that the cooperation of point discharge effect (PDE) and rational OVs concentration induced by carbon quantum dots (CQDs) can significantly enhance the migration and separation of photo-induced carriers, thereby leading to high photocatalytic activity of the as-prepared nanocomposites. In addition, the contribution of the free radicals was comprehensively calculated based on trapping experiments. the contributions of ·OH, ·O 2 - and 1 O 2 are 6.38%, 48.94% and 8.51%, respectively. This study provides a promising strategy to boosting the photoinduced carrier transfer properties by the coupling of point discharge effect and defect engineering.
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Environmental Science-Nano
·
2021
·Vol. 8
·期 7
·2049-2058
·
IF 8.131
Yuqi Zhang,Xiang Yu,Huan Liu,Xinyi Lian,Bin Shang,Yue Zhan,Tingting Fan,Zhou Chen,Xiaodong Yi
Transition metal oxides (TMOs) are emerging as a promising class of photocatalysts for pollutants' treatment. In this report, by integrating anti-solvent crystallization and thermal treatments, we have developed a facile and environmental approach for the synthesis of MoO3−x nanosheets in the presence of hexadecyl-trimethyl ammonium bromide (CTAB). The thickness of MoO3−x nanosheets varies from 20 nm to 40 nm. CTAB promotes the formation of nanosheet morphology and Mo5+ defects. Combining experimental results and density functional theory (DFT) calculations, we demonstrate that the Mo5+ defect state in MoO3−x nanosheets can enhance visible light harvest and promote the separation of photo-generated electron–hole pairs. Hence, MoO3−x-8, the optimal photocatalyst, shows the highest concentration of surface Mo5+ defect (18.7%) and the best photocatalytic activity toward rhodamine B (RhB) photodegradation. About 95.9% RhB is degraded within 15 min under visible-light irradiation (λ > 420 nm). The kinetic rate of MoO3−x-8 reaches 117 times that of commercial MoO3. It was proved by the total organic carbon (TOC) measurements that about 43.3% of RhB molecules were degraded to CO2 and H2O. Overall, this work provides an effective pathway for the nanomaterial design and potential applications in the photocatalytic oxidation of organic pollutants.
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高影响因子
CHEMOSPHERE
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2021
·
IF 7.086
Likun Chen,Kewen Xing,Qikai Shentu,Yifei Huang,Weiyang Lv,Yuyuan Yao
Developing single-atom Fenton-like catalysts with the maximum utilization of active sites present an attractive potential in environmental remediation. Herein, the single-atom Fe and N co-doped hollow carbon microsphere loaded g-C 3 N 4 catalyst (HFeNC-g-C 3 N 4 ) was prepared by an innovative cascade anchoring strategy using polystyrene as the hard template, iron phthalocyanine, polydopamine and urea as the Fe, N and C precursor, in which the in-situ generated g-C 3 N 4 could not only effectively anchor Fe atom to create the well-dispersed Fe-N x active sites, but also accelerate the electron transfer in peroxymonosulfate (PMS) activation. Taking advantages of such sequential protecting strategy, the as-synthesized HFeNC-g-C 3 N 4 catalyst with single-atom Fe-N x active sites, verified by XRD , XPS and HAADF-STEM, could work as an efficient Fenton-like catalyst for PMS activation, which achieved almost 100% removal of 4-chlorophenol (4-CP) in 5 min with the turnover frequency calculated to be 34.6 times higher than that of the homogeneous Fe 2+ catalyst. The mechanism of O 2 •- dominated radical combined with nonradical 1 O 2 pathway was confirmed by quenching experiments and ESR analysis, which might be interrelated to the improvement of pH adaptability and interference immunity of HFeNC-g-C 3 N 4 /PMS system. Overall, the present findings provided an innovation strategy for the synthesis of excellent single-atom Fe based catalyst in wastewater purification.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jiayu Zhang,Mingwei Yan,Guangchao Sun,Kaiqi Liu
A novel and cost-effective TiO 2 nanofiber membrane on porous fly ash ceramic as support (TNM-PFACS), using fly ash, graphite, and industrial rutile as raw materials, was successfully obtained based on the semi-dry press and hydrothermal process. The phase composition and micro-morphology of TNM-PFACS were characterized and analyzed by XRD, EDS, SEM, and TEM. Furthermore, it was discussed about simultaneous removal of heavy metal ions (Cu(II), Cd(II), and Cr(VI)) and rhodamine B, involving the adsorption and photodegradation process. The results indicated that the removal rate (90.15%) and adsorption capacity (9.56 mg/g) of Cu(II) was maintained, while the adsorption of Cd (II) was inhibited. In the photodegradation process, rhodamine B promoted the reduction of highly toxic Cr(VI) to Cr(III), and the highest removal rate of Cr(VI) reached 97.09%. TNM-PFACS presented simultaneous removal of heavy metal ions and rhodamine B through synergism and antagonism in the adsorption and photodegradation process, which can be applied as a simpler and cost-effective material in industrial wastewater treatment.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Libo Zhang,Lianxiang Qiu,Qingyao Zhu,Xiong Liang,Jingxiong Huang,Mengting Yang,Zhenxuan Zhang,Jiang Ma,Jun Shen
Water disinfection would result in unintended formation of halogenated disinfection by-products (DBPs) which pose potential harm to human health. In present work, Fe 78 Si 9 B 13 amorphous ribbons (Fe-Si-B AR ) showed excellent catalytic degradation performance towards an aromatic DBP, 3,5-dichlorosalicylic acid (3,5-DiClSA) by Fenton-like reaction. The catalytic degradation performances of Fe-Si-B AR , Fe 78 Si 9 B 13 crystalline ribbons (Fe-Si-B CR ) and iron powders towards 3,5-DiClSA were compared, and Fe-Si-B AR (0.0166 min −1 ) showed the fastest degradation rate. The faster surface mobility of Fe-Si-B AR , which made it easy for Fe 2+ to be oxidized by H 2 O 2 , facilitated the degradation process. High-valent iron of Fe IV could be generated which accounted for degradation of 3,5-DiClSA. The Fe-Si-B AR also showed better and better catalytic performance in 10 reuse cycles. Besides, the cytotoxicity tests indicated that the overall toxicity level of 3,5-DiClSA was declined by 88.1 % after degradation by Fe-Si-B AR . Our results showed that Fe-Si-B AR is a promising catalyst for the degradation of aromatic DBPs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yiwei Shan,Ying Guo,Yu Wang,Xiran Du,Jun Yu,Hao Luo,Hui Wu,Bruno Boury,He Xiao,Liulian Huang,Lihui Chen
Using oxygen reduction for the photocatalytic production of hydrogen peroxide (H 2 O 2 ) has been considered a green and sustainable route. In the present study, to achieve high efficiency, graphitic carbon nitride (g-C 3 N 4 ) was obtained using thermal polymerization from a bi-component precursor and was then assembled with cellulose nanofibers . It was found that a small quantity of cellulose nanofibers that generates carbon fibers upon pyrolysis greatly improves the photocatalytic activity compared with that of g-C 3 N 4 alone. The well-defined carbon/g-C 3 N 4 heterojunction-type material exhibits as high as 1.10 mmol L -1 h −1 of photo-production of H 2 O 2 under visible light , which is 4.2 times higher than that yielded by pristine g-C 3 N 4 from a single precursor. A comprehensive characterization of the photocatalyst enables us to delineate the effect of the carbon nanofiber with respect to porosity, electron–hole separation, band gap regulation, and especially the electron transfer pathway. Our results demonstrate that nanocellulose-derived carbon, when precisely assembled with other functional material such as a photocatalyst, is a promising promoter of their activity.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Li Li,Qian Zhang,Yuecheng She,Yongbo Yu,Junming Hong
Mn–Fe bimetal catalyst possesses excellent activation properties, and the enhancement of Mn/Fe redox cycle for electron transfer is related to the crystalline structure and surface functional groups. Therefore, material structure optimization is an effective strategy to improve its activation performance in advanced oxidation . In this study, Mn–Fe LDO catalyst with strong Mn/Fe synergistic effect was synthesized, and used for bisphenol A degradation. Under the condition of 0.4 g/L Mn-Fe LDO, 1.5 mM PMS and pH 7.0, Mn-Fe LDO/PMS system exhibited excellent degradation performance that 100% of BPA (20 mg/L) and 72.0% of COD could effective be degraded within 50 min. Five-run recycle and metal ions leaching experiments proved the excellent reusability and stability of Mn-Fe LDO. To deepen the understanding of catalytic mechanism, the synergistic effect and electron transfer between Mn and Fe were confirmed via XPS and CVs results. Moreover, the indispensable role of surface hydroxyl groups were clarified via phosphate masking experiment, ATR-FTIR and LSV analysis. The presence of Mn and Fe active sites and hydroxyl groups on Mn-Fe LDO surface could efficiently promote electron transfer, thus accelerating the redox cycles of Mn 3+ /Mn 2+ and Fe 3+ /Fe 2+ . The generation of SO 4 ·− and HO· as the main radicals was occurred on the surface of Mn-Fe LDO, and SO 4 ·− played a major role during the reaction. On the basis of these experimental conclusions, the mechanisms of Mn–Fe LDO/PMS system for high-efficiency BPA degradation were proposed. GC-MS analysis was performed to detect the BPA degradation intermediates and propose the possible degradation pathways.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Qian Zhou,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
A new strategy was reported for removal of low-concentration BPA in water via piezocatalytic degradation of equivalently V-doped SrTiO 3 nanofibers (V-STO NFs), which can effectively convert mechanical vibration into chemical energy under ultrasound only. The optimal doped 0.5% V-STO NFs exhibited excellent piezocatalytic performance of complete removal of BPA within 24 min, which could be ascribed to the localized surface piezoelectricity of SrTiO 3 itself and increased local asymmetry of the crystal originating from equivalent vanadium substitution. The influence of ultrasonic power, pH, BPA concentration and coexisting inorganic anions on BPA degradation were analyzed. Moreover, a suitable piezocatalytic mechanism was proposed through the free radical capture test and ESR characterization. The results suggested that the •O 2 – and •OH are the main active radicals in BPA oxidation. It provides a feasible approach for removal of phenolic pollutants by a perovskite-based nano-piezoelectric material.
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