Guoren Yue

Preparation and properties of a coated slow-release and water-retention biuret phosphoramide fertilizer with superabsorbent.

In this investigation, a novel water-insoluble slow-release fertilizer, biuret polyphosphoramide (BPAM), was formulated and synthesized from urea, phosphoric acid (H(3)PO(4)), and ferric oxide (Fe(2)O(3)). The structure of BPAM was characterized by Fourier transform infrared (FTIR) spectroscopy. Subsequently, a coated slow-release BPAM fertilizer with superabsorbent was prepared by ionic cross-linked carboxymethylchitosan (the core), acrylic acid, acrylamide, and active carbon (the coating). The variable influences on the water absorbency were investigated and optimized. Component analysis results showed that the coated slow-release BPAM contained 5.66% nitrogen and 11.7% phosphorus. The property of water retention, the behavior of slow release of phosphorus, and the capacity of adsorption of cations were evaluated, and the results revealed that the product not only had good slow-release property and excellent water retention capacity but also higher adsorption capacities of cations in saline soil.

Poly(4-vinylpyridine) supported acidic ionic liquid: A novel solid catalyst for the efficient synthesis of 2,3-dihydroquinazolin-4(1H)-ones under ultrasonic irradiation

A novel poly(4-vinylpyridine) supported acidic ionic liquid catalyst was synthesized by the reaction of 4-vinylpyridine with 1,3-propanesultone, followed by the polymerization and the addition of the heteropolyacid. Due to the combination of polymer features and ionic liquid, it acted as a heterogeneous catalyst to effectively catalyze the cyclocondensation reaction of anthranilamide with aldehydes under ultrasonic irradiation and afforded the corresponding 2,3-dihydro-4(1H)-quinazolinones compounds in good to excellent yields. In addition, the catalyst could be easily recovered by the filtration and reused six times without significant loss of catalytic activity. More importantly, the use of ultrasonic irradiation can obviously accelerate the reaction.

A self-assembled bisoxazoline/Pd composite microsphere as an excellent catalyst for Suzuki–Miyaura coupling reactions

A palladium complex based on a novel oxazoline, a solid microsphere catalyst, was successfully prepared. The structure and composition of the solid catalyst were characterized by SEM, 1H NMR, TGA and FT-IR. This catalyst exhibits high catalytic activity for Suzuki–Miyaura cross-coupling reactions of various aryl halides and arylboronic acids in aqueous media. Moreover, the catalyst shows outstanding stability and reusability, and it can be recovered simply and effectively and reused eight times without any activity decrease.

Bio-inspired fabrication of copper oxide nanowire films with switchable wettability via a facile thermal oxidation method

CuO nanowire surfaces with micro/nanometer structures were constructed on a copper substrate by a facile thermal oxidation method, the CuO nanowires have micro/nanometer structures similar to those of the hind wings of water boatmen. The as-fabricated CuO nanowire surface is superhydrophilic, and the water contact angle on it is less than 5°. Modifying the CuO nanowire surface with dodecanethiol (DDT) switched the wettability from superhydrophilic to superhydrophobic with a water contact angle of 154° and a glide angle of 4°. In addition, the original superhydrophilic behavior was regained via annealing at 300 °C due to the desorption of the low surface energy monolayer of DDT. The transition between superhydrophobicity and superhydrophilicity could be switched by alteration of the adsorption/desorption of the DDT monolayer. Compared with the superhydrophilic CuO nanowire surface, the superhydrophobic CuO nanowire surface exhibits better corrosion resistance and self-cleaning properties.

An imidazolium ionic compound-supported palladium complex as an efficient catalyst for Suzuki–Miyaura reactions in aqueous media

A water soluble and efficient ionic compound-supported palladium complex was prepared. The structure and composition of the complex was characterized by FT-IR, NMR, ICP-OES and mass spectrometry. The complex exhibits high catalytic activity for Suzuki–Miyaura reactions in aqueous media. Moreover, the catalyst shows outstanding stability and reusability, and it can be recovered simply and effectively and reused six times without much activity decrease.

A novel bisoxazoline/Pd composite microsphere: a highly active catalyst for Heck reactions

A novel bisoxazoline/Pd microsphere catalyst was successfully prepared. The structure of the solid catalyst was characterized by SEM, TGA and FT-IR. The catalyst exhibits excellent activity for the Heck reaction. Moreover, the catalyst shows outstanding stability and reusability, can be recovered simply and effectively and reused six times without any activity decrease.

Parallel synthesis of 1,2,3-triazole derivatives on a soluble polymeric support

The synthesis of 1,2,3-triazole derivatives on a modified soluble polymer, poly(ethylene glycol)(PEG), is described.