Zhejiang Gongshang University

About: Zhejiang Gongshang University is a education organization based out in Hangzhou, China. It is known for research contribution in the topics: Computer science & Chemistry. The organization has 8258 authors who have published 7670 publications receiving 90296 citations. The organization is also known as: Zhèjiāng Gōngshāng Dàxué.

Preparation of a novel chloromethylated polystyrene-2-amino-1,3,4-thiadiazole chelating resin and its adsorption properties and mechanism for separation and recovery of Pt(iv) from aqueous solutions

Abstract: A novel chelating resin, chloromethylated polystyrene beads (PS-Cl) 2-amino-1,3,4-thiadiazole (PS-ATD), with an efficient methodology was synthesized simply by the reaction of chloromethylated polystyrene with 2-amino-1,3,4-thiadiazole. The effects of reaction parameters of PS-ATD resin (reaction solvent, reaction temperature and the molar ratio of reagents and different times) were monitored to specify the best synthesis conditions. The functional group capacity (the content of the functional group) and the percentage conversion of the functional group of PS-ATD resin prepared under optimum conditions were 3.65 mmol g−1 and 88.6%, respectively. The structure of PS-ATD resin was characterized by elemental analysis, FTIR, TGA, SEM, and energy dispersive X-ray spectroscopy (EDS). Meanwhile, the adsorption properties of the resin for Pt(IV) were investigated by batch and column experiments. The results suggested that the resin possessed much better adsorption capability for Pt(IV) than for other metal ions and the maximum saturated adsorption capacity was 222.2 mg g−1 at 308 K, estimated from the Langmuir model. Furthermore, the resin could be regenerated through the desorption of the Pt(IV) anions using the mixture of 1 wt% thiourea and 0.1 M HCl. Finally, the PS-ATD resin could provide a potential application for an efficient process of Pt(IV) recovery from aqueous solutions.

Dissolution of brominated epoxy resins by dimethyl sulfoxide to separate waste printed circuit boards.

Abstract: Improved methods are required for the recycling of waste printed circuit boards (WPCBs). In this study, WPCBs (1-1.5 cm(2)) were separated into their components using dimethyl sulfoxide (DMSO) at 60 °C for 45 min and a metallographic microscope was used to verify their delamination. An increased incubation time of 210 min yielded a complete separation of WPCBs into their components, and copper foils and glass fibers were obtained. The separation time decreased with increasing temperature. When the WPCB size was increased to 2-3 cm(2), the temperature required for complete separation increased to 90 °C. When the temperature was increased to 135 °C, liquid photo solder resists could be removed from the copper foil surfaces. The DMSO was regenerated by rotary decompression evaporation, and residues were obtained. Fourier transform infrared spectroscopy (FT-IR), thermal analysis, nuclear magnetic resonance, scanning electron microscopy, and energy-dispersive X-ray spectroscopy were used to verify that these residues were brominated epoxy resins. From FT-IR analysis after the dissolution of brominated epoxy resins in DMSO it was deduced that hydrogen bonding may play an important role in the dissolution mechanism. This novel technology offers a method for separating valuable materials and preventing environmental pollution from WPCBs.

Nicotine degradation by two novel bacterial isolates of Acinetobacter sp. TW and Sphingomonas sp. TY and their responses in the presence of neonicotinoid insecticides

Abstract: Two novel nicotine-degrading bacterial strains were isolated from tobacco waste and identified as Acinetobacter sp. TW and Sphingomonas sp. TY based on morphology, physiological and biochemical tests, Biolog analysis and 16S rDNA sequencing. The 16S rDNA sequences have been deposited in GenBank under the accession numbers FJ753401 for TW and FJ754274 for TY. The best culture conditions for nicotine degradation were 25–37°C and pH 7.0–8.0 for strain TW and 25–30°C and pH 6.0–7.0 for strain TY. Under the best conditions, the cell growth and nicotine-degradation kinetics of the two isolates were assessed, and 1.0 g/l nicotine was completely degraded within 12 and 18 h for TW and TY, respectively. Moreover, the presence of four widely-used commercial neonicotinoid insecticides in the medium had no effects on nicotine degradation by TW; among the four tested neonicotinoids, only thiamethoxam significantly delayed nicotine degradation by TY. TW and TY were also able to degrade selected neonicotinoids. This is the first report of nicotine degradation by Acinetobacter sp. and Sphingomonas sp. This study showed that these two newly isolated bacteria may be suitable for the disposal of tobacco waste and the reduction of nicotine in tobacco leaves.

Application of the Ribosomal DNA ITS2 Region of Physalis (Solanaceae): DNA Barcoding and Phylogenetic Study

Abstract: Recently, commercial interest in Physalis species has grown worldwide due to their high nutritional value, edible fruit and potential medicinal properties. However, many Physalis species have similar shapes and are easily confused, and consequently the phylogenetic relationships between Physalis species are poorly understood. This hinders their safe utilization and genetic resource conservation. In this study, the nuclear ribosomal ITS2 region was used to identify species and phylogenetically examine Physalis. Eighty-six ITS2 regions from 45 Physalis species were analyzed. The ITS2 sequences were aligned using Clustal W and genetic distances were calculated using MEGA V6.0. The results showed that ITS2 regions have significant intra- and inter-specific divergences, obvious barcoding gaps, and higher species discrimination rates (82.2% for both the BLASTA1 and nearest distance methods). In addition, the secondary structure of ITS2 provided another way to differentiate species. Cluster analysis based on ITS2 regions largely concurred with the relationships among Physalis species established by many previous molecular analyses, and showed that most sections of Physalis appear to be polyphyletic. Our results demonstrated that ITS2 can be used as an efficient and powerful marker in the identification and phylogenetic study of Physalis species. The technique provides a scientific basis for the conservation of Physalis plants and for utilization of resources.