Key Laboratory of Yangtze River Water Environment

Shanghai, China

Key Laboratory of Yangtze River Water Environment

Shanghai, China

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Dong L.,Tongji University | Zhu Z.,Tongji University | Qiu Y.,Key Laboratory of Yangtze River Water Environment | Zhao J.,Key Laboratory of Yangtze River Water Environment
Chemical Engineering Journal | Year: 2010

A novel composite adsorbent, hydroxyapatite/magnetite (HAp/Fe3O4), has been prepared for the purpose of removing lead ions from aqueous solution. Varying factors that may affect the adsorption efficiency, including adsorbent dosage, solution pH and coexistent substances such as humic acid and competing cations (Ca2+, Mg2+, K+ and Na+), have been investigated. It is remarkable that using the developed composite absorbent, more than 99% of Pb2+ can be removed under desirable experimental conditions. The maximum adsorption capacity for HAp/Fe3O4 is 598.8mg/g, which is much greater than that for the previously reported materials. It is found that depending on its concentrations, humic acid affects the efficiency of lead removal, but the coexisting cations, e.g., K+, Ca2+, Na+ and Mg2+, have small influence. Mechanistic studies show that the adsorption data fits the Langmuir and Freundlich isotherm models reasonably well and the adsorption processes obey the pseudo-second-order kinetics model. Based on the experiment results, it is concluded that dissolution/precipitation and the surface complexation are mutually responsible for lead adsorption on HAp/Fe3O4, which should be attributed to the multiple functionalities of the material. © 2010 Elsevier B.V.


Xu B.,Tongji University | Liu W.,Tongji University | Kuang C.,Tongji University | Kuang C.,Key Laboratory of Yangtze River Water Environment
European Journal of Organic Chemistry | Year: 2014

A highly efficient protocol for regioselective synthesis of diaryl ketones by palladium-catalyzed direct acylation of arenes using thioethers as directing groups is reported. The possible pathway of direct acylation between thioethers and α-oxocarboxylic acids is discussed. The direct acylation of thioethers via Pd-catalyzed C-H bond activation was described. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Shi G.,Tongji University | Zhang Y.,Tongji University | Zhang Y.,Key Laboratory of Yangtze River Water Environment
Advanced Synthesis and Catalysis | Year: 2014

As a widely existing functional group in organic molecules, the carboxyl group has numerous advantageous characteristics such as great convenience for further transformation, relatively low toxicity and cost, and weak coordination to transition metal catalysts, which render it an attractive directing group in transition metal-catalyzed C-H bond functionalization reactions. This review surveys transition metal-catalyzed C-H bond functionalization reactions directed by carboxylates, including carbon-carbon, carbon-oxygen, and other carbon-heteroatom bond formation reactions. Reactions directed by the acidic N-arylamides, which are derived from carboxylic acids and have a directing mode similar to that of carboxylates, are also presented here. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Qiu J.,Tongji University | Qiu J.,Key Laboratory of Yangtze River Water Environment | Zhang R.,Tongji University | Zhang R.,Key Laboratory of Yangtze River Water Environment
Organic and Biomolecular Chemistry | Year: 2014

A novel transition-metal-free oxidative carboazidation of acrylamides using inexpensive NaN3 and K2S2O8 was achieved, which not only provided an efficient method to prepare various N 3-substituted oxindoles, but also represented a novel strategy for C-N and C-C bond formation via a free-radical cascade process. This transformation exhibits excellent functional group tolerance, affording the desired oxindoles in good to excellent yields. © the Partner Organisations 2014.


Liu W.,Tongji University | Li Y.,Tongji University | Xu B.,Tongji University | Kuang C.,Key Laboratory of Yangtze River Water Environment
Organic Letters | Year: 2013

Two highly efficient protocols for the regioselective synthesis of 2-substituted 4-alkenyl- and 4-aryl-1,2,3-triazoles by the palladium-catalyzed C-H functionalization of 1,2,3-triazole N-oxides are reported. A possible pathway of direct alkenylation with 1-octene and vinyl acetate is discussed. © 2013 American Chemical Society.


Wang Q.,Tongji University | Wang X.,Tongji University | Wang X.,Key Laboratory of Yangtze River Water Environment
Journal of Physical Chemistry A | Year: 2013

Laser-ablated beryllium atom has been codeposited at 4 K with hydrogen sulfide in excess noble gas matrices. Four noble-gas compounds NgBeS (Ng = Ne, Ar, Kr, Xe) and the BeS2 molecule are identified on the basis of the S-34 isotopic substitution, DFT and CCSD(T) theoretical predictions, and a comparison of noble-gas substitution. The agreement between the experimental and calculated vibrational frequencies supports the identification of these molecules. The dissociation energies are calculated at 1.6, 12.6, 10.7, and 13.4 kcal/mol for NeBeS, ArBeS, KrBeS, and XeBeS, respectively, at the CCSD(T) level. The BeS Lewis acid molecule favors strong chemical binding between the Be and Ng atoms. © 2013 American Chemical Society.


Liu W.,Tongji University | Li Y.,Tongji University | Wang Y.,Tongji University | Kuang C.,Tongji University | Kuang C.,Key Laboratory of Yangtze River Water Environment
Organic Letters | Year: 2013

A highly efficient protocol for C-H/C-H cross-coupling has been found to occur between 2-aryl-1,2,3-triazole N-oxides and pyridine N-oxide derivatives. In addition, two homocoupling reactions of 2-substituted 1,2,3-triazole N-oxides and some pyridine N-oxide derivatives were developed. A possible pathway of C-H/C-H direct coupling is discussed. © 2013 American Chemical Society.


Tian Q.,Tongji University | He P.,Tongji University | Kuang C.,Tongji University | Kuang C.,Key Laboratory of Yangtze River Water Environment
Organic and Biomolecular Chemistry | Year: 2014

A copper-catalyzed arylsulfonylation of N-arylsulfonyl-acrylamides with sulfonylhydrazides through a tandem radical process was developed. This methodology provided an alternative strategy for the synthesis of sulfonated oxindoles by forming C-S, C-N and C-C bonds in a single operation. © the Partner Organisations 2014.


Liu W.,Tongji University | Liu W.,Key Laboratory of Yangtze River Water Environment | Yu X.,Tongji University | Yu X.,Key Laboratory of Yangtze River Water Environment | And 2 more authors.
Organic Letters | Year: 2014

A highly efficient protocol for C2 selective alkenylation of electron-deficient thiazoles is developed. High C2 position selectivity for alkenylation products is achieved at a neutral environment, and a possible pathway of oxidative alkenylation is discussed. This methodology provides a simple way to construct a 2-alkenyl-thiazole moiety. © 2014 American Chemical Society.


Yu H.,Tongji University | Yu H.,Key Laboratory of Yangtze River Water Environment | Shen J.,Tongji University | Shen J.,Key Laboratory of Yangtze River Water Environment
Organic Letters | Year: 2014

Under mild conditions, the oxidative functionalization of C-H bonds adjacent to an amide nitrogen atom was achieved. tert-Butylperoxyamido acetal was obtained in high yields and could be further converted into α-substituted amides by treatment with Grignard reagents. © 2014 American Chemical Society.

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