Multifunctional slow-release urea fertilizer from ethylcellulose and superabsorbent coated formulations / Boli Ni in Chemical engineering journal, Vol. 155 N° 3 (Decembre 2009)  

Public ISBD [article]  inChemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 892-898 Titre : Multifunctional slow-release urea fertilizer from ethylcellulose and superabsorbent coated formulations Type de document : texte imprimé Auteurs : Boli Ni, Auteur ; Mingzhu Liu, Auteur ; Shaoyu Lü, Auteur Année de publication : 2010 Article en page(s) : pp. 892-898 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Urea fertilizer Ethylcellulose Slow-release Water-retention Biodegradation Index. décimale : 660 Résumé : The aim of this study was to prepare a double-coated, slow-release, and water-retention urea fertilizer (DSWU) to reduce environment pollution derived from excessive nitrogen fertilizer use. Ethylcellulose (EC) and crosslinked poly(acrylic acid-co-acrylamide) (P(AA-co-AM)) were used as inner and outer coating materials, respectively. The structural and chemical characteristics of the product, as well as its efficiency in slowing the nitrogen release and water evaporation in soil were examined. The nitrogen content of the product was 21.1% and its water absorbency was 70 times its own weight in tap water. Additionally, the biodegradation of EC coating in soil was assessed by differential scanning calorimetry (DSC) measurements. The results showed that the glass transition temperature (Tg) of EC coating decreased with the time prolonged, which indicated the biodegradability of EC coating in soil. These studies showed that the product with good slow-release and water-retention properties, being environmentally friendly, would find good application in agriculture and horticulture. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X49YKT-7&_user=6 [...] [article] Multifunctional slow-release urea fertilizer from ethylcellulose and superabsorbent coated formulations [texte imprimé] / Boli Ni, Auteur ; Mingzhu Liu, Auteur ; Shaoyu Lü, Auteur . - 2010 . - pp. 892-898. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 892-898 Mots-clés : Urea fertilizer Ethylcellulose Slow-release Water-retention Biodegradation Index. décimale : 660 Résumé : The aim of this study was to prepare a double-coated, slow-release, and water-retention urea fertilizer (DSWU) to reduce environment pollution derived from excessive nitrogen fertilizer use. Ethylcellulose (EC) and crosslinked poly(acrylic acid-co-acrylamide) (P(AA-co-AM)) were used as inner and outer coating materials, respectively. The structural and chemical characteristics of the product, as well as its efficiency in slowing the nitrogen release and water evaporation in soil were examined. The nitrogen content of the product was 21.1% and its water absorbency was 70 times its own weight in tap water. Additionally, the biodegradation of EC coating in soil was assessed by differential scanning calorimetry (DSC) measurements. The results showed that the glass transition temperature (Tg) of EC coating decreased with the time prolonged, which indicated the biodegradability of EC coating in soil. These studies showed that the product with good slow-release and water-retention properties, being environmentally friendly, would find good application in agriculture and horticulture. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X49YKT-7&_user=6 [...]

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Novel multinutrient fertilizer and its efect on slow release, water holding, and soil amending / Boli Ni in Industrial & engineering chemistry research, Vol. 51 N° 40 (Octobre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - Mingzhu Liu Titre : Novel multinutrient fertilizer and its efect on slow release, water holding, and soil amending Type de document : texte imprimé Auteurs : Boli Ni, Auteur ; Shaoyu Lü, Auteur ; Mingzhu Liu, Auteur Année de publication : 2012 Article en page(s) : Mingzhu Liu Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fertilization Résumé : This study was carried out to develop a novel slow-release fertilizer, which is based on natural attapulgite (APT) clay as a matrix, guar gum (GG) as an inner coating, and guar gum-g-poly(itaconic add-co-acrylamide)/humic acid (GG-g-P(IA-co-AM)/HA) superabsorbent polymer as an outer coating. The coated compound fertilizer granules with diameter in the range of 2-3 mm possess low moisture content and high mechanical hardness. The effects of APT matrix, GG, and superabsorbent polymer coatings on nutrients release were explored. The influence of the product on water-holding capacity of soil was determined. The degradation behavior of the GG-g-P(IA-co-AM)/HA outer coating was assessed by examining the weight loss with incubation time in soil. The experimental data and analysis in this study indicated that the product prepared by a simple route can effectively reduce nutrient loss in runoff or leaching, improve soil moisture content, and regulate soil acidity and alkalinity level. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451447 [article] Novel multinutrient fertilizer and its efect on slow release, water holding, and soil amending [texte imprimé] / Boli Ni, Auteur ; Shaoyu Lü, Auteur ; Mingzhu Liu, Auteur . - 2012 . - Mingzhu Liu. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - Mingzhu Liu Mots-clés : Fertilization Résumé : This study was carried out to develop a novel slow-release fertilizer, which is based on natural attapulgite (APT) clay as a matrix, guar gum (GG) as an inner coating, and guar gum-g-poly(itaconic add-co-acrylamide)/humic acid (GG-g-P(IA-co-AM)/HA) superabsorbent polymer as an outer coating. The coated compound fertilizer granules with diameter in the range of 2-3 mm possess low moisture content and high mechanical hardness. The effects of APT matrix, GG, and superabsorbent polymer coatings on nutrients release were explored. The influence of the product on water-holding capacity of soil was determined. The degradation behavior of the GG-g-P(IA-co-AM)/HA outer coating was assessed by examining the weight loss with incubation time in soil. The experimental data and analysis in this study indicated that the product prepared by a simple route can effectively reduce nutrient loss in runoff or leaching, improve soil moisture content, and regulate soil acidity and alkalinity level. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451447

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Novel slow - release multielement compound fertilizer with hydroscopicity and moisture preservation / Boli Ni in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp.4546–4552 Titre : Novel slow - release multielement compound fertilizer with hydroscopicity and moisture preservation Type de document : texte imprimé Auteurs : Boli Ni, Auteur ; Mingzhu Liu, Auteur ; Shaoyu Lü, Auteur Année de publication : 2010 Article en page(s) : pp.4546–4552 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydroscopicity Résumé : To improve the utilization of fertilizer and water resources at the same time, a novel slow-release multielement compound fertilizer (SMF) with the function of water retention was prepared. The fertilizer nutrients (11.3% N, 9.6% P2O5, 6.1% K2O, and 0.76% Cu) were entrapped in the alginate matrix granules, and the sodium alginate-g-ploy(acrylic acid) (SA-g-PAA) superabsorbent polymer was used as a coating material. The structural and chemical characteristics of the product as well as its efficiency in slowing nutrient release and water evaporation in soil were examined. The degradation of the SA-g-PAA coating was assessed by examining the weight loss with incubation time in soil. Additionally, the nutrient release mechanism was proposed and the diffusional exponent n was calculated. These studies showed that the product with good slow-release and water-retention properties, being partially degradable in nature, could be expected to have wide potential applications in modern agriculture and horticulture. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019769 [article] Novel slow - release multielement compound fertilizer with hydroscopicity and moisture preservation [texte imprimé] / Boli Ni, Auteur ; Mingzhu Liu, Auteur ; Shaoyu Lü, Auteur . - 2010 . - pp.4546–4552. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp.4546–4552 Mots-clés : Hydroscopicity Résumé : To improve the utilization of fertilizer and water resources at the same time, a novel slow-release multielement compound fertilizer (SMF) with the function of water retention was prepared. The fertilizer nutrients (11.3% N, 9.6% P2O5, 6.1% K2O, and 0.76% Cu) were entrapped in the alginate matrix granules, and the sodium alginate-g-ploy(acrylic acid) (SA-g-PAA) superabsorbent polymer was used as a coating material. The structural and chemical characteristics of the product as well as its efficiency in slowing nutrient release and water evaporation in soil were examined. The degradation of the SA-g-PAA coating was assessed by examining the weight loss with incubation time in soil. Additionally, the nutrient release mechanism was proposed and the diffusional exponent n was calculated. These studies showed that the product with good slow-release and water-retention properties, being partially degradable in nature, could be expected to have wide potential applications in modern agriculture and horticulture. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019769

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