JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Kai Li,Shuanglong Ma,Shengjun Xu,Haichao Fu,Zhuoqian Li,Yi Li,Shiliang Liu,Jinge Du
Three magnetic biochar nanocomposites named as C800-1, C800-2 and C800-3 with increased iron deposition amount, decreased graphitized degree and gradually destroyed graphitized carbon layers, respectively, were prepared using potassium ferrate as activator and corn straw as biomass. C800-1, C800-2 and C800-3 exhibited much different bisphenol A degradation effect in presence of peroxymonosulfate among which C800-3 owned the best catalytic performance. For the degradation mechanism, the dominant role of electron transfer pathway was gradually replaced by the SO 4 •– pathway with the increase of iron amount and the destruction of graphitized carbon layers. This work would provide a simple and feasible method, namely changing the ratio of potassium ferrate and biochar, to manipulate the radical and nonradical degradation pathway in PMS-based organic wastewater purification.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Meimei Wang,Yunke Cui,Hongyang Cao,Ping Wei,Chen Chen,Xiuyan Li,Juan Xu,Guoping Sheng
In this study, zeolitic imidazolate framework-67 (ZIF-67) derived Co 3 O 4 /NiCo 2 O 4 double-shelled nanocages (DSNCs) were fabricated and utilized as catalysts to activate peroxydisulfate (PDS) for bisphenol A (BPA) degradation. The results showed that Co 3 O 4 /NiCo 2 O 4 DSNCs exhibited superior BPA degradation performance over Co 3 O 4 NCs and NiCo 2 O 4 NCs. PDS combined with the interfaces of both the Co 3 O 4 inner shell and NiCo 2 O 4 outer shell to form complex, inducing the nonradical oxidation of BPA by electron abstraction. The double-shelled hollow structure helped to increase the instantaneous concentration of reactants in the void space of Co 3 O 4 /NiCo 2 O 4 DSNCs, thus promoting the decomposition of BPA. The Co 3 O 4 /NiCo 2 O 4 DSNCs had high selectivity for BPA degradation and were resistant to halogens and background organic matter in wastewater. Our work indicated that metal-organic framework (MOF)-derived nanomaterials with a hollow structure have a promising application prospect for persulfate-based advanced oxidation technology.
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CELLULOSE
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2020
·Vol. 27
·期 17
·10047-10060
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IF 4.21
Wang Minglei,Zhang Maojiang,Gao Qianhong,Liu Yinjie,Zhang Mingxing,Shen Rongfang,Zhang Yumei,Hu Jiangtao,Wu Guozhong
Immobilization of photocatalysts on substrates is an important factor for water purification in practical applications. In this study, an efficient Ag@AgBr photocatalytic coating was attached onto the surface of cotton fabric via radiation-induced graft polymerization and subsequent chemical reactions, and the resultant product was denoted as Cot-Ag@AgBr. The graft chains acted not only as a source of bromine, but also as an intermediate layer to anchor the Ag@AgBr photocatalytic coating via strong electrostatic interactions. The immobilized Ag@AgBr photocatalytic coating exhibited outstanding photocatalytic properties for organic dye degradation under visible light irradiation. Furthermore, Cot-Ag@AgBr presented high stability and robust durability, which conferred its excellent visible-light-driven photocatalytic activity after five rounds of photodegradation. After 10 min of ultrasonication, the amount of Ag@AgBr precipitate that leached from the Cot-Ag@AgBr was < 2%. Therefore, the as-synthesized cotton fabric offered good insight into the functionalization of polymer substrates with photocatalysts and could be useful for advanced wastewater treatment under the cyclic operations.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Wei Zhang,Wei Liu,Guoliang Li,Wei Du,Jianbo Lu,Jianguo Song,Qixia Yang,Xiangming Li,Huizhong Xu,Xu He,Jun Ma
The para arsanilic acid ( p -ASA) used as feed additive in the poultry and swine industries tends to transform into more toxic inorganic arsenic (As(V) and As(III)), leading to a greater risk to human health and environmental system. In this study, simultaneous adsorption and oxidation of p -ASA was achieved by a synthesized highly efficient nanostructured Fe-Ti-Mn composite oxide (FTMO), with a high specific surface area of 424.7 m 2 /g. The maximum adsorption capacity for p -ASA could be as high as 45.6 mg/g, meanwhile the combined oxidation/photo-oxidation processes led to the formation of intermediate containing hydrazine group, however, without release of toxic inorganic As(III) and As(V). The p -ASA adsorption by FTMO was verified as the chemisorption process with the formation of inner-sphere complexes at the solid/water interface, which was prominently influenced by solution pH, coexisting ions and humic acid, however relatively insensitive to ionic strength. The systematic characterization by FTIR, XPS, EPR and XANES revealed that Fe phase of FTMO played the dominant role for p -ASA adsorption, while Mn and Ti phases were responsible for the oxidation and photo-oxidation of p -ASA, respectively.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Ruzhen Xie,Yanbin Jiang,Andac Armutlulu,Ziye Shen,Bo Lai,Hui Wang
In this work, cost-effective, magnetic carbon-supported Fe@Ti composite (Fe@Ti/Cs) with abundant active sites was synthesized by one-step carbothermal reduction of ilmenite with the assistance of microwave oven and utilized as a highly efficient persulfate (PS) activator for the wastewater purification. The coexistence of Fe 0/2+/3+ , Ti 3+/4+ and oxygen vacancies on Fe@Ti/Cs was found to favor for the electron transfer to PS, which facilitate the generation of reactive oxygen species (ROS). Catalytic experiment results showed that the Fe@Ti/C-4 produced from ilmenite/carbon with a mass ratio of 4:1 exhibited the best catalytic activation performance towards PS for the degradation of Rhodamine B (RhB). Usage of merely 0.12 g/L Fe@Ti/C-4 enabled the removal of 94.01% RhB (200 mg/L) within 30 min in the PS containing system, significantly outperforming ilmenite + PS (29.29%) and carbon + PS (49.91%) systems tested under the same conditions. The physico-chemical properties of the produced Fe@Ti/Cs before and after the reaction were carefully characterized. Radical scavenging experiments and electron paramagnetic resonance (EPR) analysis were carried out to better understand the underlying mechanism. The results indicate that oxygen vacancies in Fe@Ti/C-4 promoted the electron transfer and participated in the transition metal redox cycle to generate ROS in the PS-containing system, which was highly efficient for degrading RhB into small molecules and finally enabling mineralization. This work offers a new perspective for designing highly efficient and stable PS activators with long life derived from natural ore for environmental remediation.
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CHEMISTRY OF MATERIALS
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2020
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IF 9.567
Shuming Dong,Yushan Dong,Tao Jia,Fangmei Zhang,Zhao Wang,Lili Feng,Qianqian Sun,Shili Gai,Piaoping Yang
Tailored to the peculiar tumor microenvironment, Fenton reaction-based chemodynamic therapy (CDT) has attracted considerable attention for tumor treatment. However, the efficacy of CDT is highly limited by both H2O2 overproduction and the low activity of catalysts at the tumor site. Herein, a novel magnetic targeting nanoplatform (γ-Fe2O3-GOx-DMSN) has been designed by simply depositing ultrasmall γ-Fe2O3 nanoparticles and natural glucose oxidase (GOx) into the large mesopores (∼13 nm) of dendritic mesoporous silica (DMSN) spheres for near-infrared (NIR) light-enhanced CDT efficacy. In this structure, GOx can effectively consume glucose in the tumor cells to induce a decrease in the pH value and generate a considerable amount of H2O2, both of which promote subsequent Fenton reaction. These ultrasmall γ-Fe2O3 nanoparticles not only serve as an efficacious Fenton catalyst for degradation of the increased H2O2 within the tumor to produce highly toxic hydroxyl radicals (•OH) but also exhibit high photothermal therapy (PTT) efficiency upon irradiation with 808 nm light. Importantly, the generated hypothermia can significantly accelerate the Fenton process, thereby enabling a synergetic PTT/hypothermia-enhanced CDT effect. Our work manifests a proof of concept of H2O2-evolving and NIR-enhanced CDT, providing a new perspective for cancer therapy.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Songtao Zhong,Hui Zhou,Ming Shen,Yufeng Yao,Qiang Gao
It is vital for environment purification to design and prepare an artificial photocatalyst that can effectively separate photogenerated carriers and maintain the redox ability of system. In this paper, a g-C 3 N 4 /BiOI/Bi 2 O 2 CO 3 photocatalyst was rationally designed and successfully prepared via two-step in-situ transforming process. The results of X-ray diffraction, Fourier transform infrared spectroscopy , X-ray photoelectron spectroscopy, scanning electron microscopy, energy dispersive X-ray analysis, and transmission electron microscopy confirm the successful synthesis of ternary g-C 3 N 4 /BiOI/Bi 2 O 2 CO 3 catalysts. The photocatalytic activities of all catalysts were assessed by the degradation of Rhodamine B (RhB) under simulated sunlight illumination. The g-C 3 N 4 /BiOI/Bi 2 O 2 CO 3 catalysts showed much higher photocatalytic activities than single g-C 3 N 4 , or BiOI and dual g-C 3 N 4 /BiOI. The results of electron spin resonance and active species trapping experiments revealed that h + and • O 2 − were responsible for the photodegradation of RhB, and a possible photogenerated carrier transport mechanism was proposed.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2020
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IF 7.864
Jia Xie,Zhipeng Liao,Ming Zhang,Linhan Ni,Junwen Qi,Chaohai Wang,Xiuyun Sun,Lianjun Wang,Shaobin Wang,Jiansheng Li
Clean water production calls for highly efficient and less energy-intensive technologies. Herein, a novel concept of a sequential ultrafiltration-catalysis membrane is developed by loading Co3O4/C@SiO2 yolk–shell nanoreactors into the fingerlike channels of a polymeric ultrafiltration membrane. Such a sequenced structure design successfully integrates selective separation with peroxymonosulfate-based catalysis to prepare a functionalized molecular sieve membrane, which exhibits excellent decontamination performance toward multipollutants by filtering the water matrices containing humic acid (HA) and bisphenol A (BPA). In this study, 100% rejection of HA and 95% catalytic degradation of BPA were achieved under a low pressure of 0.14 MPa and an ultrahigh flux of 229 L m–2 h–1, corresponding to a retention time of 3.1 s. Notably, the removal performance of multiple pollutants essentially depends on the ordered arrangement of ultrafiltration and catalysis. Moreover, the flow-through process demonstrated significant enhancement of BPA degradation kinetics, which is 21.9 times higher than that of a conventional batch reactor. This study provides a novel strategy for excellent removal of multiple pollutants in water.
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CHEMOSPHERE
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2020
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IF 5.778
Zhiming Yan,Yong Gu,Xing Wang,Yueli Hu,Xia Li
Wastewater contains a large number of anions and organics which can scavenge reactive radicals and limit the application of sulfate radical-based advanced oxidation processes (SR-AOPs) in practical engineering. Here, we studied the removal rate and mechanism of aniline by SR-AOPs in different influencing factors, such as sodium persulfate dosage, ferrous ions dosage, solution pH, Cl - , HCO 3 - , NO 3 - , and other organic matter. By recognizing and analyzing free radicals, we concluded that SO 4 •- plays a major role in aniline degradation. The aniline removal rate increased with the initial concentrations of persulfate and ferrous ions, but aniline degradation was inhibited by excessive dosage. The aniline removal rate by ferrous-ions-catalyzed persulfate was higher under acidic conditions and could be improved under alkaline conditions if no ferrous ions were added. The addition of bicarbonate ions inhibited aniline removal, and the addition of nitrate ions barely caused the effect. While the addition of chloride ions promoted aniline degradation, which was confirmed that HClO generated from the reacting of Cl - and persulfate played a key role. However, TOC indicated that aniline was not completely mineralized in the process. Further analysis of the products from GC-MS demonstrated that chloride-ion additions produced some harmful halogenated by-products. Our results can act as a basis for developing processes for the aniline degradation in wastewater.
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Journal of the Taiwan Institute of Chemical Engineers
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2020
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IF 4.794
Xinlin Liu,Lingyan Xu,Guosheng Zhou,Qian Liu,Minshan Song,Song Han,Sivakumar Esakkimuthu,Jessica Vinh,Bahram Barati,Ziyang Lu
In this work, BiVO 4 /MoS 2 (BM) heterojunction was prepared by combining ultrasonic agitation exfoliation and in-situ growth method. Since flower-like MoS 2 comprised a larger contact area with pollutants, by decorating dewdrops-shaped BiVO 4 on the flower-like MoS 2 , h + on BiVO 4 can be transferred to MoS 2 . Therefore, h + with strong oxidizing ability enriched on MoS 2 can effectively attack the pollutants and substantially improve the photocatalytic activity of the as-prepared heterojunction. The degradation rate of tetracycline with BiVO 4 /MoS 2 heterojunction (68.83 % in 120 min) was 5.64 and 4.23 times that with pure MoS 2 (12.19 %) and pure BiVO 4 (16.26 %), respectively. This work provided a new idea for the construction of highly active MoS 2 -based heterojunctions.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Qian Ye,Hao Xu,Qingguo Wang,Xiaowei Huo,Yunqi Wang,Xue Huang,Guanyu Zhou,Jinfeng Lu,Jing Zhang
The specific roles of tartaric acid (TA), as an eco-friendly ligand, in homogeneous and heterogeneous copper-catalyzed systems were systematically revealed and new mechanisms of TA enhancing the three Fenton-like processes were proposed to provide a theoretical significance in overcoming the deficiency of conventional Fenton processes. The results identified hydroxyl radical (•OH) as the main species responsible for the simultaneous decomposition of TA and metronidazole (MNZ) according to TOC removal. The ESR technique was used to detect superoxide radicals (•O 2 − ), carbon-centered radical (•R) and hydrogen radical (•H) in the Cu 2+ /TA/H 2 O 2 system, which contributed to the acceleration of the Cu 2+ /Cu + redox cycle. The enhancing effect of TA on the homogeneous process was ascribed to the formation of a soluble complex with Cu 2+ , which favored the pH range extension, Cu + oxidation , and radical generation. Moreover, the adsorption of TA on the catalysts surface promoted the consumption of H 2 O 2 , inducing •OH generation. The formed surface complex (≡Cu 2+ -TA) also accelerated the regeneration of ≡Cu + , which was confirmed by density functional theory (DFT) calculation and surface characterization analysis (SEM, XRD, and XPS). The possible degradation pathways of MNZ in TA-modified Fenton-like system were also clarified.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Yi-meng Huang,Guang Li,Mingzhen Li,Jijie Yin,Na Meng,Di Zhang,Xiao-qiang Cao,Fan-ping Zhu,Ming Chen,Lin Li,Xian-jun Lyu
N-doped carbon materials have been proven to be effective catalysts for activating peroxymonosulfate (PMS). Marine algae biomass is rich in nitrogenous substances , which can reduce the cost of N-doping process and can obtain excellent N-doped catalysts cheaply and easily. In this study, kelp biomass was selected to prepare N-doped kelp biochar (KB) materials. The high defect degree, high specific surface area, and participation of graphite N make KB have excellent catalytic degradation ability. The KB degraded 40 mg/L ofloxacin (OFL) close to 100% within 60 min, applied with PMS. Through quenching experiments and electron paramagnetic resonance spectroscopy, the degradation process dominated by non-radical pathways was determined. At the same time, O 2 ·- and 1 O 2 were closely related, and a significant impact of quenching O 2 ·- on the reaction was observed. The non-radical approach made the system excellent performance over a wide pH range and in the presence of multiple anions. The experiments of reusability confirmed the stability of the material. Its catalytic performance was restored after low-temperature pyrolysis . This research supports the use of endogenous nitrogen in biomass. It provides more options for advanced oxidation process application and marine resource development.
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