Resin-loaded cationic hydrogel: A new sorbent for recovering of grapefruit polyphenols

This paper presents a study of the recovering of polyphenols from grapefruit biowastes through extraction and batch adsorption process using novel resin-loaded cationic hydrogel. To prepare adsorbent, 2-(dimethylamino) ethyl methacrylate (DMAEMA) monomer was polymerized by free radical mechanisms in presence of resin particles and then tertiary amino groups on PDMAEMA residue were quaternized using methyl iodide. The developed adsorbent was then characterized by FTIR, SEM, XRD, and Brunauer, Emmet, and Teller analysis. The resin-loaded cationic hydrogel displayed an enhanced affinity for binding with polyphenols at pH value of 10 due to the strong electrostatic attraction between positively charged adsorbent surface and solute molecules. The adsorption capacity of 60 (mg-naringin-g^?1-adsorbent) was obtained when the other experimental conditions were chosen as follows: initial polyphenol concentration; 0.13?g?mL^?1, contact time; 30?min, temperature; 25°C. On the other hand, the adsorbent consisting solely of resin particles shown lower affinity for polyphenols. The adsorption results revealed that the resin-loaded cationic hydrogels exhibited significant improvement in the recovery of polyphenols from grapefruit peels through integrated extraction–adsorption process.     

罗马照明规划

文章对意大利罗马的照明项目作了深入详细的分析。从罗马照明的设计规范作为引入点,对罗马城内城,外城,不同的照明对象,以及从历史文化的保护角度作了仔细的分析与考量。     

Assessing primary areas for a sustainable biochar application in soil by using GIS-based multi-criteria evaluation

Clean Technologies and Environmental Policy - In this study, an innovative approach was carried out using the geographic information systems (GIS)-based multi-criteria evaluation model to assign...     

Geographic information systems-based land suitability assessment for switchgrass cultivation in marginal lands: a case study for İzmir-Turkey

Clean Technologies and Environmental Policy - Energy crop cultivation is considered the main factor in the rapid increase in the share of biomass energy in the future global energy supply. However,...     

Tree‐based channel assignment schemes for multi‐channel wireless sensor networks

Many sensor node platforms used for establishing wireless sensor networks (WSNs) can support multiple radio channels for wireless communication. Therefore, rather than using a single radio channel for whole network, multiple channels can be utilized in a sensor network simultaneously to decrease overall network interference, which may help increase the aggregate network throughput and decrease packet collisions and delays. This method, however, requires appropriate schemes to be used for assigning channels to nodes for multi‐channel communication in the network. Because data generated by sensor nodes are usually delivered to the sink node using routing trees, a tree‐based channel assignment scheme is a natural approach for assigning channels in a WSN. We present two fast tree‐based channel assignment schemes (called bottom up channel assignment and neighbor count‐based channel assignment) for multi‐channel WSNs. We also propose a new interference metric that is used by our algorithms in making decisions. We validated and evaluated our proposed schemes via extensive simulation experiments. Our simulation results show that our algorithms can decrease interference in a network, thereby increasing performance, and that our algorithms are good alternatives for static channel assignment in WSNs. Copyright © 2015 John Wiley & Sons, Ltd.