CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2019
·Vol. 35
·期 3
·440-448
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IF 1.071
Lyu Cong,Li Yicheng,Fang Chen,Feng Wei,Sun Wentian,Zhang Qihui
Peroxymonosulfate(PMS) has received increasing attention as viable technology for recalcitrant organics removal from polluted waters. Although promising, alternative heterogeneous catalysts with stable structure, strong hydrophilicity, environmental friendliness and excellent catalytic performance are highly desirable to facilitate the wide industrialization of PMS. In this work, Ni doped CoOOH catalyst was employed as PMS activator. Ni dopant had a significant influence on the morphology, structure and catalytic performance of CoOOH, Ni 0.2 Co 0.8 OOH exhibited the best catalytic performance. Reaction rate of Ni 0.2 Co 0.8 OOH was 2, 4, and 4.4 times that of CoOOH, CoFe 2 O 4 and Co 3 O 4 , respectively. Moreover, Ni 0.2 Co 0.8 OOH/PMS system had potential application to organic pollutants and displayed a great catalytic activity over a broader pH value( e.g. , 4–10). More importantly, Ni doping accelerated the transformation of Co(III) and Co(II) and formed active species CoOH + and NiOH + , which were responsible to the enhancement of PMS activation. • OH, \(\overline G \) and 1 O 2 were detected, indicating both non-radical and radical processes in the Ni 0.2 Co 0.8 OOH/PMS system. These findings provide a promising alternative to mixed-metal oxyhydroxides catalysts for PMS activation, demonstrating a great potential in environmental remediation and wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Zhiqiang Sun,Lei Zhao,Caihong Liu,Yufei Zhen,Wenjuan Zhang,Jun Ma
A novel three-dimensional (3D) adsorbent of reduced graphene oxide-β-cyclodextrin (r-GO-CD) aerogel was firstly synthesized through a one-step hydrothermal reaction. Various physicochemical characterization results demonstrated that the cross-linking of “soft” β-cyclodextrin among the “hard” graphene oxide nanosheets, simultaneously combining with self-assembly process of aerogel, contributed to the formation of superior structural and stable r-GO-CD aerogel. The adsorption of bisphenol A (BPA) onto r-GO-CD was chemisorption and endothermic, which fitted well with the pseudo-second-order kinetic and Langmuir isotherm. The saturated adsorption capacity of r-GO-CD towards BPA was 346.0 mg g −1 at 298 K, which was ∼11 times to that of conventional activated carbon. The r-GO-CD displayed a promising environmental application potential as revealed from the stable BPA adsorption efficiency in diverse interferences (H + /OH − , NaCl), presence of trace BPA and repeated cycling tests. The long-term dynamic filtration experiment conducted with raw surface water showed that the effective treated volume of r-GO-CD towards BPA (100 μg L −1 ) was 270 mL which was ∼30 times to that of r-GO due to the excellent selectivity and adsorptivity of β-cyclodextrin for BPA. The distinct adsorption mechanism of r-GO-CD aerogel was demonstrated as synergistic effects of graphene oxide nanosheets and β-cyclodextrin, along with π-π interaction and hydrogen bonding.
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TALANTA
·
2019
·
IF 4.916
Shi-Yao Ma,Xue Wang,Hui-Ling Duan,Jun Wang,Han-Ying Zhan,Zhi-Qi Zhang
Taking Zn–Fe bimetallic organic-framework as both template and precursor, and furfuryl alcohol (FA) as secondary carbon source, a high-surface-area magnetic nanoporous carbon (MNPC) material was successful prepared. The MNPC exhibits excellent adsorption performance for bisphenol analogs (BPs). The maximum adsorption capacity achieved 439.0 mg g −1 for bisphenol AF , 423.7 mg g −1 for bisphenol S, 330.4 mg g −1 for tetrabromobisphenol A and 252.5 mg g −1 for bisphenol A. A sensitive magnetic solid-phase extraction with MNPC as adsorbent coupled with HPLC-UV analytical method was developed for the detection of trace BPs. The limits of detection for BPs were as low as 0.03–0.07 ng mg −1 with the RSDs of less than 4.6%. This method was applied to detection of four BPs in environmental water samples and the satisfactory results were obtained.
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Jinhong Fan,Hehe Qin,Simin Jiang
Peroxymonosulfate (PMS) is an alternative to hydrogen peroxide in advanced oxidation processes. Herein, we present a simple one-pot synthetic approach for the Mn-doped graphite phase carbon nitride (g-C 3 N 4 ) materials and make it as a catalyst to activate PMS for acetaminophen (ACT) degradation. Fabricated Mn-g-C 3 N 4 composites (MnCN) were characterized by SEM, EDS, XRD, XPS, and FTIR. Results showed that Mn was uniformly dispersed in the structure of g-C 3 N 4 mostly in the form of Mn-N coordination. The effects of pH, contents of doped Mn, catalyst dosage, and reusability of catalyst and corresponding kinetic study were conducted to determine the catalytic performance of MnCN. High reaction efficiency was obtained in a wide pH range of 3.2–9. 100% removal of ACT in 15 min under optimized conditions with initial pH 6.5, 0.8 g/L of PMS and 200 mg/L of catalyst of 0.5-MnCN. Additionally, the reaction mechanism of the PMS/MnCN system was investigated using the electron spin resonance technique, quenching studies as well as different organics with electron-donating or electron-withdrawing groups. No PMS decomposition was detected without substrates. No inhibition effect by ethanol or tert -Butyl alcohol and complete inhibition effect by benzoquinone and partly by furfuryl alcohol, as well as ESR spectrum of TEMP- 1 O 2 were observed, suggesting that the activation of PMS proceeded in a new way, which is different from traditional sulfate radical-based advanced oxidation processes. A possible mechanism was proposed for ACT removal. PMS was first bounded to Mn-N sites to generate the superoxide anion. Then singlet oxygen produced by superoxide anion would react with ACT by replacing the electron-donating group of acylamino.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 136
·期 15
·47264
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IF 1.901
Fuhan Liu,Yaxin Zhang,Guang Yu,Yanjun Hou,Haijun Niu
A series of novel polymers (coded as BCT-1 to BCT-6 (BTC is block triphenylamine)) based on N 1 -(4-aminophenyl)- N 1 -phenyl benzene-1,4-diamine, pyridine-2,6-dicarboxylic acid, 4,4′-(phenyl azanediyl)dibenzoic acid (PDA), and different diamine compounds were synthesized successfully through a polymer condensation reaction. For comparison, model polymers, BCT–2,6-pyridine dicarboxylic acid (PA) and BCT–PDA, were synthesized as well. The electrochromic properties of the BCTs were determined via an electrochemical workstation and a UV–visible spectrophotometer. Through electrooxidation, the polymer films showed reversible redox processes and steady color changes. In a comparision of the electrochromic characteristics of the BCTs, almost all the novel polymer films showed a better electrochromism stability, a higher electrochromic coloration efficiency (CE), and a more rapid switching time than BCT–PA and BCT–PDA. Among these polymers, BCT-1 exhibited the highest CE of 266.7 cm 2 /C, and BCT-4 showed the most rapid switching time (color switching time = 3.08 s and bleaching time = 2.01 s). © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47264.
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Polymer Chemistry
·
2018
·Vol. 9
·期 42
·5215-5223
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IF 4.927
Wei Yuan,Weiwen Chi,Ting Han,Jun Du,Hongkun Li,Yongfang Li,Ben Zhong Tang
Cu(I)-mediated and metal-free click polymerizations of azides and terminal alkynes have been developed into powerful techniques for constructing linear and hyperbranched polytriazoles. However, the 1,3-dipolar cycloaddition of azides with internal alkynes is rarely employed as a synthetic tool to prepare functional polymers. In this work, metal-free phenylpropiolate-azide polycycloaddition was developed for efficient synthesis of poly(phenyltriazolylcarboxylate)s (PPTCs), a kind of polyester. The aromatic and aliphatic diphenylpropiolates could readily react with diazides under heating, affording soluble PPTCs with high molecular weights (Mw up to 28 500) in excellent yields (up to 98%). The polymerization is insensitive towards oxygen and moisture, and can proceed smoothly in an open atmosphere. The obtained PPTCs are thermally stable with 5% weight loss temperatures higher than 318 °C. As the polymers contained ester groups, they exhibited fast degradation under basic conditions. The PPTC containing tetraphenylethene moieties shows a unique phenomenon of aggregation-induced emission, and can be employed as a fluorescent chemosensor to sensitively detect explosives. Its thin film can generate two-dimensional fluorescent photopatterns by UV irradiation.
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CELLULOSE
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2018
·Vol. 25
·期 11
·6691-6704
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IF 3.809
Li Yun,Yu Qiao,Yin Xianze,Xu Jing,Cai Yajun,Han Lu,Huang Hao,Zhou Yingshan,Tan Yeqiang,Wang Luoxin,Wang Hua
Abstract Superhydrophobic material involves the fabrication of appropriate roughness and low surface energy. Studies concerning enhancing the attachment between substrates and low surface energy material have been reported. Hence, it might also be feasible to make low surface energy material as an interface binder to enhance the attachment. In our work, the simple dip-coating method was used to fabricate polybenzoxazine (PBZ)/SiO 2 -coating cotton (PBZSC) fabric for rapid oil–water separation. The surface morphology and wettability of the PBZSC fabric as well as the properties of the separation were explored using various methods. These results demonstrated that PBZSC fabric not only had excellent thermal properties, but also maintained excellent superhydrophobicity (WCA > 150°) under various harsh conditions which was mainly attributed to higher surface roughness contributed by SiO 2 and lower surface energy, heat resistance as well as acid and alkali resistance from PBZ resin, respectively. More importantly, the separation conducted by the PBZSC fabric not only showed great recycle property, but also separated a series of oil and water mixtures with up to 96% separation efficiency. Therefore, it is anticipated that this low-cost PBZSC fabric will be readily and widely utilized in designing multifunctional membrane for large-area oil-spill cleanup without using fluoropolymers or silicones. Graphical abstract
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CARBOHYDRATE POLYMERS
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2018
·
IF 5.158
Xi Chen,Panyu Li,Yan Kang,Xiaotong Zeng,Yi Xie,Yongkui Zhang,Yabo Wang,Tonghui Xie
Hydrogels are emerging materials in pollutant treatment due to their high absorbability and environmental friendliness. Herein, a novel temperature-sensitive hydrogel based on xanthan gum (XG) and N-isopropylacrylamide (NIPA) was successfully synthesized in a water system using low-cost citric acid as crosslinking agent. The lower critical solution temperature of the honeycomb macroporous XG/NIPA hydrogels was 40 °C. Meanwhile, the hydrogels had good water-absorption capacity and the swelling degree reached up to 70.1. Using XG/NIPA hydrogels to absorb bisphenol A (BPA), the maximum adsorption capacity was as high as 458 mg/g. The process was a multilayer adsorption and the rate-controlling step is chemisorption. Thus, the temperature-sensitive XG/NIPA hydrogel had great potential in absorbing BPA from aqueous solutions.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2018
·
IF 4.841
Haochi Liu,Lan Ding,Ligang Chen,Yanhua Chen,Tianyu Zhou,Huiyu Li,Yuan Xu,Li Zhao,Ning Huang
Biomass carbon dots (CDs) prepared by sweet potato peels were superior fluorophores with low toxicity and excellent photostability. A novel designed fluorescence probe for specific recognition and sensitive detection of oxytetracycline (OTC) was fabricated with CDs and molecularly imprinted polymer (MIP). The quenching of CDs happened when rebinding with OTC due to electron-transfer-induced fluorescence quenching mechanism. The fluorescence probe was successfully applied in honey with the recoveries ranging from 90.2% to 97.3%. The detection limit of OTC was 15.3 ng mL −1 . This work provides promising perspectives that the development of fluorescent MIP will be valuable for rapid analysis in complex samples.
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Journal of the American Chemical Society
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2018
·
IF 14.357
Xuning Li,Xiang Huang,Shibo Xi,Shu Miao,Jie Ding,Weizheng Cai,Song Liu,Xiaoli Yang,Hongbin Yang,Jiajian Gao,Junhu Wang,Yanqiang Huang,Tao Zhang,Bin Liu
The Fenton-like process presents one of the most promising strategies to generate reactive oxygen-containing radicals to deal with the ever-growing environmental pollution. However, developing improved catalysts with adequate activity and stability is still a long-term goal for practical application. Herein, we demonstrate single cobalt atoms anchored on porous N-doped graphene with dual reaction sites as highly reactive and stable Fenton-like catalysts for efficient catalytic oxidation of recalcitrant organics via activation of peroxymonosulfate (PMS). Our experiments and density functional theory (DFT) calculations show that the CoN4 site with a single Co atom serves as the active site with optimal binding energy for PMS activation, while the adjacent pyrrolic N site adsorbs organic molecules. The dual reaction sites greatly reduce the migration distance of the active singlet oxygen produced from PMS activation and thus improve the Fenton-like catalytic performance.
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ANALYTICA CHIMICA ACTA
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2018
·
IF 5.123
Kunhao Yang,Zhongqiu Li,Yueguang Lv,Chuyi Yu,Peilong Wang,Xiaoou Su,Li Wu,Yujian He
An electrochemical aptasensor for ultrasensitive detection of hydroxylated polychlorinated biphenyl (OH-PCB) was developed. In this work, the sulfydryl aptamer selected for OH-PCB was easily immobilized on the surface of the modified glassy carbon electrode via Au-S bond due to incorporation of gold nanoparticles/poly dimethyl diallyl ammonium chloride-graphene composite. The fabrication process of the electrochemical aptasensor was characterized by electrochemical impedance spectroscopy and cyclic voltammetry . The peak currents obtained by differential pulse voltammetry decreased with the increasing of OH-PCB concentrations. The current responded approximately logarithmically to the OH-PCB concentration ranging from 2.9 × 10 −11 M to 2.9 × 10 −7 M with excellent linear correlation performance. The detection limit of OH-PCB was estimated as low as 5.3 × 10 −12 M. The developed method had been successfully applied to analyzing lake water. Particularly, the method of the electrochemical aptasensor opens up a new perspective in environmental monitoring by the aptamer identification.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
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IF 3.235
Yaoyu Wu,Zengyao Zheng,Jianying Yang,Yuejuan Lin,Xiaoshan Zhang,Yaowen Chen,Wenhua Gao
In this study, reduced graphene oxide-bismuth zinc sulfide nanocomposite (RGO-Bi 2 ZnS 4 ) with excellent electrochemiluminescence (ECL) signal amplification were prepared by a solvothermal method and successfully used to fabricate ECL sensors to rapidly detect bisphenol A (BPA). Bi 2 ZnS 4 can form numerous nanosheet clusters uniformly distributed on the surface of a graphene sheet, which not only avoids the phenomenon of stacking of the graphene layers due to π-π interactions, but also greatly increases the specific surface area of graphene, thus providing a wider active area and channel for the oxidation-reduction reaction on the electrode. Chitosan as a kind of immobilized adhesive, with good adhesion and good compatibility, can greatly facilitate the stabilization of Ru(bpy) 3 2+ and RGO-Bi 2 ZnS 4 nanocomposites on the surface of the electrode and the smooth fabrication of the subsequent sensors. Also, the electron transfer process in this system is described in detail based on the effective quenching effect of BPA on Ru(bpy) 3 2+ /tripropylamine system. At the same time, the ECL amplification performance of RGO-Bi 2 ZnS 4 nanocomposite in the analysis and testing was evaluated by measuring the BPA concentration in actual water samples. Under optimal conditions, the fabricated ECL sensor has good sensitivity to BPA, with a linear range of 0.05–3.0 μM and a detection limit of 0.02 μM. In this study, a convenient and promising solution for the rapid detection of BPA or its environmental hormones is provided, and is also anticipated to be a reference for the analysis of other biochemical compounds.
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