Study On Property And Germplasm Screening Of Efficient And Special For Heavy Metal Cr(â…¥) Biosorption Of Jute(Corchorus Olitorius L.)

Crop germplasm resources are important foundation for breeding and variety improvement. As theoldest jute producer country in the world, China is rich in jute germplasm resources. The germplasmscreening studies for fiber usage purpose have been carried out a lot, while for by-products utilizationwas rarely reported.Jute, annual herbaceous plant of Tiliaceae Corchorus. included two common cultivators,Corchorus capsularis L. and Corchorus olitorius L.. Compared with Corchorus capsularis L., thepowders of Corchorus olitorius L. have better performance in the adsorption for heavy metal such asCr(Ⅵ), Cd, Pb, Ni, Cu in wastewater and will play an important role in the remediation of waste watercontaining heavy metals.In our work, one of Corchorus olitorius L. germplasm powder made in powder was chosen asadsorbent to realize biosorption property and screen excellent germplasm for heavy metals adsorption.The adsorption conditions, process and mechanism was studied with heavy metal Cr(Ⅵ) used asadsorbate. Afterwards, the tender shoots of main stem, primary and secondary branch of twenty-threetypical jute germplasm collected from home and abroad were first made into natural heavy metaladsorbent to determine the removal rate of Cr(Ⅵ) in solution. Investigation, variance analysis andcorrelation analysis of functional traits closely related to adsorption capacity and production of tendershoot including growth duration dynamic, plant height, branching habit and tender shoots yield at alllevels branches were conducted, in order to screen jute germplasm with high quality for the adsorptionof heavy metals, and provide the theoretical basis for the development of new dedicated germplasmswith high yield used to heavy metal adsorption. The main study results were indicated as follows:(1) Among the tested jute parts, leaf and tender shoot are superior to the bark and stalk on theabsorption efficiency. Optimal removal rate could be achieved at initial pH value1, initial Cr(Ⅵ)concentration value100mg·L-1and60min reaction time, and the removal rate could be up to nearly100%. Adsorption capacity of jute leaf is quite high compared with other adsorption materials, up to185.09±0.36mg·g-1. As a kind of natural absorbent for Cr(Ⅵ), jute leaf or tender shoot powder withlow cost in price and high efficiency and fast in absorption could be regard as potential bio-absorbent tobe applied to remove heavy metals in waste water.(2) The kinetic of adsorption followed the pseudo second order kinetics model and the Langmuirmodel gives a better fit than the Freundlich model.(3) The ability of adsorption on Cr(Ⅵ) varies with the kind of jute germplasm, significantly.Different branching levels of tender shoot displayed different removal rates.(4) Twenty-three typical germplasms of Corchorus olitorius L. were significantly different on leafshape, stem color, plant height, branching number and yield of tender shoot. (5) Plant height was the most important factors influencing the tender tip yield and the removalrate. It was significantly positive correlated with yield and negative correlated with removal rate.(6) Considered from the aspects of production and removal rate, J001and J011had excellentproperty at the yield and removal rate and therefore were suitable for cultivating as the specialgermplasms for heavy metal adsorption.