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Zhang J.,CAS Lanzhou Institute of Chemical Physics | Zhang J.,Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province | Wang Q.,CAS Lanzhou Institute of Chemical Physics | Chen H.,Taizhou University | And 2 more authors.
Clay Minerals | Year: 2010

The effects of acid activation on the chemical composition, surface area and pore structure of palygorskite from Xuyi (Jiangsu, P.R. China) were investigated systematically using X-ray fluorescence (XRF) and BET techniques. The palygorskite samples were activated with HCl, H2SO4 and H3PO4 of various concentrations at 80°C for 4 h. The influences of acid concentration and acid type on the chemical composition, adsorption-desorption isotherms at 77 K, pore-size distribution, surface area and pore volume were studied in detail. The contents of most components of palygorskite decrease with increasing acid concentration except for Si and Ti. HCl shows a greater activation activity and its effect on the dissolution of components of palygorskite is greater than that of H2SO4 and H3PO4. It was found that 3 mol l-1 H 3PO4 is a more efficient activator for increasing the number of micropores in palygorskite, whereas 12 mol l-1 HCl is more suitable for use in enhancing the number of meso- and macropores. The acid concentration and acid type have a great influence on the surface area and pore volume. HCl is the most effective at enhancing the external surface area and mesopore volume of palygorskite, whereas, H3PO4 is more suitable for use in improving the micropore surface and volume. © 2010 Mineralogical Society.


Wu D.,Huaiyin Institute of Technology | Jin Y.-L.,Huaiyin Institute of Technology | Jin Y.-L.,Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province | Chen C.-P.,Huaiyin Institute of Technology | Chen C.-P.,Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province
Kuangwu Yanshi/ Journal of Mineralogy and Petrology | Year: 2013

Soluble organic matter is separated from the palygorskite samples collected from Linze area in Gansu Province, China. Its composition is analyzed and the ratio of stable isotope 13C in typical samples is determined. They are compared with those of clay samples in Jiangsu and Anhui border,China. The results show that the soluble organic matter abundance in rock sample is low. Gas chromatogram distribution of hydrocarbon in Linze samples reflects that original biological material comes from terrestrial higher plant as well as from aquatic biological source partly,with average δ13C of organic matter in palygorskite of -18. 74‰. While the hydrocarbon in Jiangsu-Anhui area samples derives from aquatic plankton,lacking of terrestrial higher plant input,with a S13C of organic matter in Yongxiaoshan Hill palygorskite of -10. 67‰. Preliminary results show that both minerals form two areas are related with salty water. Gansu sample formed in the environment of inland salt lakes and its raw material of inorganic mineral was terrestrial clastic components. But original substance of Jiangsu-Anhui area palygorskite was volcanic ash or volcanic mud which might form in closed and semi-closed water environment near the coast or in relatively isolated coast.


Gao J.,Huaiyin Institute of Technology | Gao J.,Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province | Shi Y.-Y.,Huaiyin Institute of Technology | Zhou H.-F.,Huaian Wanbang Aromatic Chemicals Industry Co. | And 3 more authors.
Environmental Science and Pollution Research | Year: 2016

The effects of modified attapulgite (MA) on the dissipations of the plasticizers di-n-butyl phthalate (DBP) and di-(2-ethylhexyl) phthalate (DEHP) in soil, as well as on the composition of soil microbial community, were studied. DBP, DEHP (50 mg kg−1 in soil, respectively), and MA (1, 5, and 10 % in soil) were mixed thoroughly with soil and incubated for 60 days. DBP- and DEHP-contaminated soils without MA were used as the controls. Both of DBP and DEHP residues in bulk soils and four soil fractions were measured at five incubation times 1, 7, 15, 30, and 60 days, and their dissipation kinetic equations were analyzed. The microbial phospholipid fatty acid (PLFA) concentrations were also measured at the end of experiment. Our results showed that the effect of modified attapulgite on DBP dissipation was related to its dosage in soil. The DEHP dissipation was both inhibited by MA at the 5 and 10 % rates in soils. The application of MA changed the content percentages but did not change the concentration order of phthalate acid esters (PAEs) in soil particle-size fractions. The total microbial PLFA content was significantly increased by 5 and 10 % MA in the contaminated soils. Meanwhile, the gram-negative (GN)/gram-positive (GP) ratios increased when MA was applied at the dosages of 5 and 10 % in DBP and 10 % in DEHP-contaminated soils. Principal component analysis (PCA) indicated that the change of bacteria PLFA, especially the GN bacterial PLFA, depended on the dosages of MA added into soil. The application of MA into soil has a positive effect on reducing the eco-toxicity of PAEs in soil based on the analysis of the soil microbial PLFA. © 2016 Springer-Verlag Berlin Heidelberg


Gao J.,Huaiyin Institute of Technology | Gao J.,Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province | Qin X.,Huaiyin Institute of Technology | Qin X.,Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province | And 2 more authors.
Environmental Science and Pollution Research | Year: 2015

This study aimed to evaluate the effects of poultry manure (PM) on soil biological properties in DBP- and DEHP-contaminated soils. An indoor incubation experiment was conducted. Soil microbial biomass C (Cmic), soil enzymatic activities, and microbial phospholipid fatty acid (PLFA) concentrations were measured during incubation period. The results indicated that except alkaline phosphatase activity, DBP and DEHP had negative effects on Cmic, dehydrogenase, urease, protease activities, and contents of total PLFA. However, 5 % PM treatment alleviated the negative effects of PAEs on the above biochemical parameters. In DBP-contaminated soil, 5 % PM amendment even resulted in dehydroenase activity and Cmic content increasing by 17.8 and 11.8 % on the day 15 of incubation, respectively. During the incubation periods, the total PLFA contents decreased maximumly by 17.2 and 11.6 % in DBP- and DEHP-contaminated soils without PM amendments, respectively. Compared with those in uncontaminated soil, the total PLFA contents increased slightly and the value of bacPLFA/fugalPLFA increased significantly in PAE-contaminated soils with 5 % PM amendment. Nevertheless, in both contaminated soils, the effects of 5 % PM amendment on the biochemical parameters were not observed with 10 % PM amendment. In 10 % PM-amended soils, DBP and DEHP had little effect on Cmic, soil enzymatic activities, and microbial community composition. At the end of incubation, the effects of PAEs on these parameters disappeared, irrespective of PM amendment. The application of PM ameliorated the negative effect of PAEs on soil biological environment. However, further work is needed to study the effect of PM on soil microbial gene expression in order to explain the change mechanisms of soil biological properties. © 2015 Springer-Verlag Berlin Heidelberg


Han H.,Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province | Han H.,Huaiyin Institute of Technology | Gu X.,Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province | Gu X.,Huaiyin Institute of Technology | And 3 more authors.
Proceedings - International Conference on Computer Distributed Control and Intelligent Environmental Monitoring, CDCIEM 2011 | Year: 2011

A new composite type of industrial corrosion and scale inhibitor of maleic anhydride-acrylamide copolymer attapulgite was developed, when water was solvent, hydrogen peroxide was initiator, maleic anhydride (MA) and acrylamide were monomers, and hot acid treated attapulgite clay was added into the polymerization system. Its scale and corrosion inhibitions were evaluated by methods of static test and rotary weight loss test. For further study, modification temperature and acidity, stirring time, and adding dosage of attapulgite clay on the scale inhibition performance of copolymer were investigated, as well as the corrosion inhibitory property of the final product. Results showed that, the copolymerization conditions were: modified attapulgite clay after 300 °C calcination and 4% hydrochloric acid 0.05 g, maleic anhydride 2.7 g, acrylamide 1.525 g, hydrogen peroxide 1 mL, water 9.9 mL, reaction temperature 60 °C, and stirring time 100 min. Under these conditions, the hightest anti-scaling rate was 85.68% that was improved by 73.40%, and the corresponding corrosion rate was 0.093 mm/a that was improved by 26.2%. The composite type of industrial corrosion and scale inhibitor prepared with hot acid treated attapulgite clay possesses advantages of new-type, efficient, economical and phosphatefree, and proves potential application prospect in industrial circulation cooling water treatment. © 2011 IEEE.

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