Upcycling tea waste particles into magnetic adsorbent materials for removal of Cr(Ⅵ) from aqueous solutions  

作　　者：Jiahong Wu Hamza Annath Haili Chen Chirangano Mangwandi 

机构地区：[1]School of Chemistry and Chemical Engineering,Queen’s University Belfast,David Kier Building,BT95AG,United Kingdom [2]Department of Chemistry,University of Lancaster,Bailrigg,Lancaster,LA 4YB,Unite [3]Kingdomc College of Chemistry and Materials Engineering,Zhejiang Agriculture&Forestry University,Hangzhou,311300,China

出　　处：《Particuology》2023年第9期115-126,共12页颗粒学报（英文版）

摘　　要：In this work,locally available tea wastes were used as precursors for the development of cost-effectivebio-sorbent materials for heavy metal removal from wastewater.Chemical and thermal treatments toprepare magnetic/non-magnetic tea waste-based adsorbents were discussed and correlated theirproperties with corresponding Cr(Ⅵ)adsorption capacity.These bio-sorbents were thoroughly characterized by FT-IR,PXRD,N2 adsorption-desorption surface area techniques and Cr adsorption performancewas investigated in batch reactor under different conditions such as adsorbent dosage,initial Cr concentration,solution pH and contact time.Careful bleaching steps,incorporation of magnetic ironnanoparticles and judicious temperature treatments of tea wastes resulted in high performing biosorbents with a complete removal of Cr at a dosage of 0.25 g/mL of the solution.Cr adsorption on thesetea waste-based bio-sorbents were found to be fitting to a pseudo 2nd order kinetics.

关 键 词：Bleached-tea waste Magnetic-tea waste BIOSORPTION Chromium Adsorption kinetics PYROLYSIS 

分 类 号：O64[理学—物理化学]