scholarly journals Formulating and Optimizing a Novel Biochar-Based Fertilizer for Simultaneous Slow-Release of Nitrogen and Immobilization of Cadmium

2018 ◽  
Vol 10 (8) ◽  
pp. 2740 ◽  
Author(s):  
Lu Chen ◽  
Qincheng Chen ◽  
Pinhua Rao ◽  
Lili Yan ◽  
Alghashm Shakib ◽  
...  
Keyword(s):  
Release Rate ◽  
Slow Release ◽  
Porous Structures ◽  
Nitrogen Release ◽  
Sem Images ◽  
Elementary Analysis ◽  
Monolayer Adsorption ◽  
Urea Hydrogen Peroxide ◽  
Rice Husk Biochar ◽  
Optimized Conditions

This study aimed to develop and optimize a novel biochar-based fertilizer composed of rice husk biochar and urea–hydrogen peroxide (UHP), which can simultaneously slowly release nitrogen and immobilize cadmium (Cd). Response surface methodology (RSM) was adopted to optimize the fertilizer formulation with the lowest nitrogen release rate. Under the optimized conditions, the cumulative nitrogen release rate of the biochar-based fertilizer was 17.63%, which was significantly lower than that of ordinary fertilizer. Elementary analysis, scanning electron microscopy (SEM) images, and Fourier transform infrared (FTIR) spectroscopy proved that UHP attached to the porous structures of the biochar. The adsorption test showed that the adsorption of Cd onto biochar-based fertilizer quickly reached equilibrium with an equilibrium adsorbing quantity (Qe) of 6.3279 mg·g−1 with an initial concentration of 10 mg·L−1. Compared to original biochar, the Cd immobilization ability of biochar-based fertilizer was significantly better. The adsorption of Cd on biochar-based fertilizer is mainly based on a monolayer adsorption behavior. Finally, improved crop growth was demonstrated by pot experiments, which showed a significant increase in the biomass of cabbage. The concept and findings presented in this study may be used as references in developing a novel biochar-based fertilizer for simultaneously enhancing crop yield and reducing environmental risk.

scholarly journals Preparation and properties of hydrogel based on sawdust cellulose for environmentally friendly slow release fertilizers

2020 ◽  
Vol 9 (1) ◽  
pp. 139-152 ◽  
Author(s):  
Xiao Zhang ◽  
Yanlu Liu ◽  
Panfang Lu ◽  
Min Zhang
Keyword(s):  
Slow Release ◽  
Environmentally Friendly ◽  
Water Absorbency ◽  
The Novel ◽  
Structure And Properties ◽  
Nitrogen Release ◽  
Release Property ◽  
Slow Release Fertilizers ◽  
Grafting Copolymerization ◽  
Cross Linker

AbstractA novel hydrogel slow-release nitrogen fertilizer based on sawdust with water absorbency was prepared using grafting copolymerization. Urea was incorporated as nitrogen source in a hydrogel fertilizer. Potassium persulfate (KPS) and N,N᾽-methylenebis acrylamide (MBA) were used as the initiator and cross-linker, respectively. The structure and properties of the samples were characterized by XPS, EDS, SEM, XRD and FTIR. The effects of various salt solutions, ionic strength and pH on swelling behavior were discussed. The results showed that the largest water absorbency of the sample reached 210 g/g in distilled water. In addition, the sample had the good nitrogen release property. Thus, the novel environmentally friendly hydrogel fertilizer may be widely applied to agricultural and horticultural fields.

Design and synthesis of periodic mesoporous organosilica materials with a multi-compartment structure

RSC Advances ◽  
2015 ◽  
Vol 5 (109) ◽  
pp. 89397-89406 ◽  
Author(s):  
Chun Xiang Cynthia Lin ◽  
Siddharth Jambhrunkar ◽  
Pei Yuan ◽  
Chun Hui Clayton Zhou ◽  
George Xiu Song Zhao
Keyword(s):  
Anticancer Drug ◽  
Release Rate ◽  
Slow Release ◽  
Drug Carrier ◽  
High Loading ◽  
Loading Capacity ◽  
Periodic Mesoporous Organosilica ◽  
Design And Synthesis ◽  
Mesoporous Organosilica ◽  
Organosilica Materials

Multi-compartment periodic mesoporous organosilica materials show desirable properties as anticancer drug carrier with high loading capacity and slow release rate.

Gemcitabine Nanoparticles Improve the Activity of Ovarian Cancer Cells by Inhibiting CA-125 and Apoptosis-Related Proteins

2021 ◽  
Vol 11 (7) ◽  
pp. 1400-1405
Author(s):  
Sisi Yi ◽  
Chen Feng ◽  
Xiaohua Hu
Keyword(s):  
Ovarian Cancer ◽  
Cell Viability ◽  
Release Rate ◽  
Inhibitory Action ◽  
Encapsulation Efficiency ◽  
Slow Release ◽  
Drug Loading ◽  
Ca 125 ◽  
Ovarian Cancer Cells ◽  
Related Proteins

In recent years, the risk of ovarian cancer (OC) has become increasingly prevalent. Gemcitabine (GE) provides excellent inhibitory action on some solid tumors, but how it affects OC remains elusive. In the present research, we prepared GE nanoparticles (GEN) and analyzed OC cell viability under its intervention, hoping to conceive novel ideas for future clinical treatment of OC. Through experiments, we observed that the encapsulation efficiency and drug loading of GEN were observably higher than those of GE alone, and the release rate presented a stable slow release state. Under GEN intervention, the viability of OC cells was decreased, the apoptosis rate was elevated, and the apoptosis-related proteins were activated, while CA-125 was suppressed. Therefore, we can see that GEN exert favorable inhibitory action on OC cell viability, whose mechanism may be achieved through activating apoptosis-related proteins and inhibiting CA-125, which may be a new scheme for OC treatment in the future.

Nitrogen release dynamics and transformation of slow release fertiliser products and their effects on tea yield and quality

2008 ◽  
Vol 88 (5) ◽  
pp. 839-846 ◽  
Author(s):  
Wen-Yan Han ◽  
Li-Feng Ma ◽  
Yuan-Zhi Shi ◽  
Jian-Yun Ruan ◽  
Sarah J Kemmitt
Keyword(s):  
Slow Release ◽  
Nitrogen Release ◽  
Yield And Quality

scholarly journals Kinetika Slow Release Pupuk Urea Berlapis Chitosan Termodifikasi

2017 ◽  
Vol 1 (2) ◽  
Author(s):  
YC Danarto ◽  
Anggita Nugrahey ◽  
Sela Murni Noviani
Keyword(s):  
Water Retention ◽  
Slow Release ◽  
Zero Order ◽  
Release Profile ◽  
Nitrogen Release ◽  
Diffusion Kinetic ◽  
Urea Fertilizer ◽  
First Order ◽  
Modified Chitosan ◽  
Urea Content

<p>During this time, the use of urea is not efficient, because about 40-70% of nitrogen in the fertilizer is not absorbed by plants. In order to increase the effectivity of nitrogen release in urea fertilizer, it needs to be coated with modified chitosan as slow releasing agent to form a hydrogel material by forming a cross linking with glutaraldehyde cross-linker.The aims of this research is to study the mechanism and the appropriate kinetic model of nitrogen release in slow releasing fertilizer of modified chitosan. This research was conducted by analyzing the ability of bio-hydrogel by calculating the percentage of swelling ratio and water retention of hydrogel and the nitrogen release in slow releasing fertilizer both in the soil and water. The experiments were conducted by varying the amount of urea used which  30 gram, 40 gram, 50 gram, 60 gram and 70 gram of urea fertilizer. The The release profile is then plotted on several models of diffusion kinetic such as zero order, first order, higuchi and korsmeyer peppas. The appropriate model of diffusion kinetic is chosen by the largest correction factor (R2).The results showed that nitrogen release of the slow releasing fertilizer in the soil with 50% urea content  and  the  water  followed  korsmeyer  peppas  model  with  fickian  mechanism. Nitrogen release in the soil with urea content of 30%, 40%, 60%, and 70% followed the korsmeyer peppas model with nonfickian mechanism.</p>

scholarly journals Effects of Foliar Application of Urea and Urea-Formaldehyde/Triazone on Soybean and Corn Crops

Agronomy ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1549
Author(s):  
Bruno Maia Abdo Rahmen Cassim ◽  
Antonio Pedro Martins Machado ◽  
Daniel Fortune ◽  
Fernando Rodrigues Moreira ◽  
Éder Júnior De Oliveira Zampar ◽  
...  
Keyword(s):  
Slow Release ◽  
Foliar Application ◽  
Block Design ◽  
Urea Formaldehyde ◽  
Nitrogen Fertilizers ◽  
Urea Solution ◽  
Corn Yield ◽  
Nitrogen Release ◽  
Randomized Block Design ◽  
Significant Difference

The objective of the study was to evaluate the effect of foliar application of urea and urea-formaldehyde, triazone-based fertilizers on soybean and corn crops. Four experiments were carried out, two on soybeans, one on first season corn, and the other on second season corn. The experiments were conducted using a randomized block design, with 5 treatments studied: T1—control without application of foliar nitrogen (N); T2—foliar application of conventional urea solution and three treatments with Hexion foliar fertilizers based on urea-formaldehyde and triazone (N-Hexion®), with varying levels of N and slow-release components; T3—Hexion 1; T4—Hexion 2; and T5—Hexion 3. The foliar application of conventional urea showed no statistically significant difference in relation to the control for the yield components and grain yield for the soybean crops in seasons 2018–2019 and 2019–2020. Urea-formaldehyde/triazone treatments showed a significant increase in yield for soybeans in the 2018–2019 season compared to the control and to conventional urea. Nitrogen fertilizers with high percentages of slow-release compounds promote nitrogen release more slowly, which led to no significant increase in yield for Hexion 1. No statistical differences were observed in the corn yield for the first and second crop.

Nitrogen Release Rate Differs by Fertilizer Source

2005 ◽  
Vol 4 (1) ◽  
pp. 85-92
Author(s):  
Jeffrey C. Wilson ◽  
Eugene K. Blythe ◽  
David M. Cole ◽  
Edgar L. Vinson ◽  
Jeff L. Sibley
Keyword(s):  
Release Rate ◽  
Nitrogen Release

Preparation of an Environmental Friendly Slow Release Nitrogen Fertilizer

2014 ◽  
Vol 1015 ◽  
pp. 346-349 ◽  
Author(s):  
Jing Li ◽  
Yu Sen Hu ◽  
Lu Mei Pu ◽  
Guang Sheng Guo ◽  
Hong Yan Niu
Keyword(s):  
Slow Release ◽  
Nitrogen Release ◽  
Dialdehyde Starch ◽  
Element Analysis ◽  
Modern Agriculture ◽  
Environmental Friendly ◽  
Release Property ◽  
Potential Applications ◽  
Early Farming ◽  
Slow Release Urea

An environmental friendly slow-release urea fertilizer with double films (SUFDF) was prepared by using dialdehyde starch urea resin (DASU) as inner coating and polylactic acid (PLA) as outer materials. The structural, chemical characteristics and morphology of the SUFDF were characterized by FTIR, element analysis and SEM. Its efficiency in slowing the nitrogen release was examined via soil leaching and pot experiments. The experimental results indicated that the introduction of hydrophobic PLA and DASU reduced the swell ability of the fertilizer, which made it can provide nitrogen persistently at the early farming. After the urea dissolved, the DASU in the fertilizer would continue to release nitrogen due to its good slow-release property. So this fertilizer would have potential applications in modern agriculture and horticulture.

Sign in / Sign up

Export Citation Format

Share Document