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Effective and selective adsorption of uranyl ions by porous polyethylenimine-functionalized carboxylated chitosan/oxidized activated charcoal composite

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Frontiers of Chemical Science and Engineering 2022年第3期16卷 408-419页

作者： Juan Shen Fang Cao Siqi Liu Congjun Wang Rigui Chen Ke Chen School of Materials Science and Engineering Southwest University of Science and TechnologyMianyang621010China State Key Laboratory of Environmental-friendly Energy Materials Southwest University of Science and TechnologyMianyang621010China

Composite materials have elicited much interest because of their superior performance in the removal of toxic and radioactive uranyl ions from aqueous solutions.With polyethyleneimine as a functional group,carboxylated chitosan as a matrix,and oxidizing activated carbon as a nanofiller,this study synthesized a novel environment-friendly polyethylenimine-functionalized carboxylated chitosan/oxidized activated charcoal(PCO)biocomposite with a unique three-dimensional porous structure.PCO was synthesized through an easy chemical cross-linking method.Detailed characterization certified the formation of the unique three-dimensional porous structure.The obtained PCO was used to remove uranyl ions from an aqueous solution,demonstrating the maximum adsorption capacity of 450 mg·g^(−1).The adsorption capacity of PCO decreased by less than 7.51%after five adsorption-desorption cycles.PCO exhibited good adsorption selectivity(K_(d)=3.45×10^(4) mL·g^(−1))for uranyl ions.The adsorption mechanism of PCO was also discussed.The material showed good potential for application in the treatment of wastewater containing uranyl ions.

关键词： polyethylenimine carboxylated chitosan activated charcoal uranyl ion adsorption

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Adsorption characteristics of chitooligosaccharides onto activated charcoal in aqueous solutions

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Journal of Oceanology and Limnology 2020年第2期38卷 342-350页

作者： YU Yu LI Kecheng Marine Science and Engineering College Qingdao Agricultural UniversityQingdao 266109China Key Laboratory of Experimental Marine Biology Center for Ocean Mega-ScienceInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology Qingdao 266237China

To investigate the adsorption characteristics of chitooligosaccharides in solution onto activated charcoal,we studied the optimal adsorption conditions and the adsorption mechanisms of the chitooligosaccharides onto activated charcoal,which will greatly promote the application of activated charcoal in the chitooligosaccharides separation and purification.We studied the effects of particle size of activated charcoal,pH of solution,contact time,temperature,and initial concentration of chitooligosaccharides on the adsorption behavior in batch mode experiments.activated charcoal in fine particle size showed a high uptake of chitooligosaccharides.Weak alkaline solution(pH 8–9)was the most favorable to the adsorption.The adsorption equilibrium after 60 min was established,which followed a pseudo-second-order kinetic model.The adsorption capacity(Q_(max))reached 0.195 g/g(chitooligosaccharides/activated charcoal)at 298 K.The adsorption was temperature-insensitive,and the adsorption isotherms could be best described by the Langmuir equation.Chitooligosaccharides adsorbed on activated charcoal could be desorbed in 50%ethanol solution in combination with an acidic condition(pH 2),reaching desorption efficiency of 96.0%.These findings are of great significance for the production and purification of amino oligosaccharides including chitooligosaccharides using activated charcoal.

关键词： chitooligosaccharide adsorption activated charcoal kinetics isotherm

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Atrazine removal from water by activated charcoal cloths

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International Soil and Water Conservation Research 2020年第2期8卷 205-212页

作者： Javier M.Gonzalez Lynnette R.Murphy Chad J.Penn Veera M.Boddu Laura L.Sanders National Soil Erosion Research Laboratory USDA-ARSWest LafayetteIN47907USA Earth Science Department Northeastern Illinois UniversityChicagoIL60625USA O’Neill School of Public and Environmental Affairs University of IndianaBloomingtonIN47405USA Plant Polymer Research Unit National Center for Agriculture Utilization ResearchUSDA-ARSPeoriaIL61604USA

Pollution control structures may be adapted to enhance the removal of nutrients and pesticides from water. charcoal-like material is known to sorb organic compounds in solution, including atrazine, a herbicide used to control broadleaf weeds, which persists in soils and can migrate from soils to water bodies, ultimately affecting water quality. The primary goal of this study was to investigate if activated charcoal cloths (single-weave, SW;double-weave, DW;and knitted, KT) are more efficient to remove atrazine from aqueous solutions than a cloth without activated charcoal (control) currently used in pollution control structures. The approach consisted of sorption kinetics, flow-through, and desorption/degradation experiments using 50 and 1000μg L-1 atrazine solutions. Results showed that within 30 min of contact time, the control sorbed from 22.6 to 36.1% of atrazine in solution;whereas the activated charcoal cloths sorbed from 76 to 99% of atrazine in solution (SW > KT > DW). The flow-through ex-periments showed that the SW sorbed 88.2, 76.1, and 52.2%of atrazine at the contact time of 0.75, 5, and 10 min, respectively. After 28 days of incubation, previously sorbed atrazine on the SW cloth did not degrade and activated charcoal cloths are a practical alternative for improving atrazine removal in water in pollution control structures.

关键词： Atrazine activated charcoal Water quality Pesticide Cloth

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In vitro propagation of a medicinal plant: Tripterygium wilfordii Hook f.

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Forestry Studies in China 2009年第3期11卷 174-178页

作者： CHEN Bi-hua Forestry Biotechnology Research and Development Center Fujian Academy of Forestry Sciences Fuzhou 350012 P. R. China Key Laboratory of Timber Forest Breeding and Cultivation for Mountainous Areas in Southern China State Forestry Administration Fuzhou 350012 P. R. China

In this study a reliable protocol was developed for the establishment of commercial in vitro cultures of Tripterygium wilfordii Hook f.. Juvenile shoots from one-year-old elite plants were used as the source of explants. New axillary shoots were obtained after 30 days of culture on a MS medium supplemented with BAP （2.0 mg.L^-1） and NAA （0.1 mg.L^-1）. The optimal multiplication medium was a modified MS medium supplemented with BAP （1.0 mg.L^-1） and NAA （0.1 mg.L^-1）. This yielded a multiplication rate of 2.4 for each subculture. Slightly more than 92% of shoots rooted when cultured on a modified MS medium containing IBA （0.2 mg.L^-1） and activated charcoal （0.5 mg.L^-1）. activated charcoal promoted both a strong and a high rooting rate during the rooting phase. Plantlets were transferred to pots for a short acclimatization stage in a greenhouse where 95% of the plantlets survived. This highly reproducible procedure can be adopted for large-scale propagation of T. wilfordii.

关键词： in vitro propagation Tripterygium wilfordii Hook f. multiplication rooting activated charcoal

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Cryopreservation of Cyrtopodium hatschbachii Pabst (Orchidaceae) immature seeds by encapsulation-dehydration

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BIOCELL 2012年第1期36卷 31-36页

作者： MAURO RODRIGO SURENCISKI EDUARDO ALBERTO FLACHSLAND GRACIELA TERADA LUIS AMADO MROGINSKI AND HEBE YOLANDA REY Instituto de Botánica del Nordeste(IBONE) CONICET–UNNEFacultad de Ciencias Agrarias(UNNE)C.C.209(3400)CorrientesArgentina

The aim of the present study was to investigate the efficiency of the encapsulation-dehydration technique for cryopreservation of Cyrtopodium hastchbachii Pabst seeds.Immature seeds of this species were cryopreserved by an encapsulation-dehydration technique.Seeds of five immature pods,120 days after pollination,were encapsulated in 3%calcium alginate matrix and pretreated in liquid medium supplemented with 0.08 M sucrose(24 h),0.15 M sucrose(24 h),0.25 M sucrose(48 h),0.5 M sucrose(24 h)and 0.75 M sucrose(24 h)in shaker at 60 rpm.Alginate beads were dehydrated 5 h in silicagel and immersed in liquid nitrogen for 12 h.Cryopreserved beads were thawed at 30℃ for 1 min,rehydrated using the same liquid mediums[0.75 M sucrose(24 h),0.5 M sucrose(24 h),0.25 M sucrose(48 h)and 0.15 M sucrose(24 h)]and cultivated in half strength Murashige&Skoog medium(1962)with the addition of 2 g/L activated charcoal.Sixty four percent of seeds survived and developed into acclimatized plants after being cryopreserved.In this work,the encapsulation-dehydration technique was employed for first time in Cyrtopodium hatschbachii.

关键词： cryoconservation liquid nitrogen calcium alginate activated charcoal sucrose

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Dynamic Changes in Enzyme Activities and Phenolic Content during Early Stage of Explants Browning in Herbaceous Peony(Paeonia lactiflora)

Dynamic Changes in Enzyme Activities and Phenolic Content du...

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2017年中国作物学会学术年会

作者： Masocha Valerie Farai Ge Shujun College of Agronomy Hebei Agricultural University/North China Key Laboratory for Crop Germplasm Resources of Education Ministry

[Research background]Paeonia lactiflora Pall,a herbaceous peony is a well-known traditional plant in China as it is widely used in landscaping and garden greening(high ornamental value) due to its large flower,elegant shape,gorgeous color and rich fragrance,and it has extensively expanded out of China.Not only are herbaceous peonies grown as garden ornamentals,but they also have a long history of use as traditional medicinal plants.It is clinically used to treat depression-like symptoms.Despite the popularity of this ornamental and medicinal plant,several reasons restrict its production and use,such as lack of reliable systems for rapid propagation.The multiple traditional choices for propagation of peony have low propagation coefficiency which makes it difficult to meet the increasing demands of the global market.In vitro culture is considered to be an effective vegetative propagation means for peony production through mass clonal multiplication since it possesses many advantages.However,explant browning due to accumulation of phenolic compounds is one of the major problems in the primary culture and polyphenol oxidase and phenylalanine ammonia lyases(PAL) are major proteases involved in plant tissue browning.But related studies were less reported on this species.[Materials and methods]Unspecified cultivars widely grown in most parts of China were used as initial plant material for the experiment.All the materials bought from local medicinal germplasm market(Anguo,Hebei) were planted in pots and placed outside for natural environmental conditions.The dynamic changes of phenolic content and the two major proteases activities were assessed during the early stages of explants browning across summer,autumn,winter and spring season.And several measure were tried to control the browning of the explants.[Results and analysis]There were statistically significant differences in both phenolic contents and enzyme activities across the four different seasons at 5%significance level.Autumn season had the highest total phenol

关键词： Paeonia lactijlora Pall Explants browning Total phenolic content Enzyme activities Dynamic changes activated charcoal

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