Novel mem­branes for fil­tra­tion of cop­per in waste­water

Chemical Industry Digest - - New Developments -

As­tudy was car­ried out to de­sign novel, en­vi­ron­men­tally friendly mem­branes by in situ and ex situ routes based on bac­te­rial cel­lu­lose (BC) as a tem­plate for the chi­tosan (Ch) as func­tional en­tity for the elim­i­na­tion of cop­per in wastew­a­ters. Two routes led to bio-nanocom­pos­ites with dif­fer­ent as­pects and physico-chem­i­cal prop­er­ties. The me­chan­i­cal be­hav­iour in wet state, strongly re­lated to crys­tallinity and wa­ter hold­ing ca­pac­ity, re­sulted to be very dif­fer­ent de­pend­ing on the prepa­ra­tion route al­though the Ch con­tent was very sim­i­lar: 35 and 37 wt% for the in situ and ex situ mem­branes, re­spec­tively. The mor­pho­log­i­cal char­ac­ter­i­za­tion sug­gested a bet­ter in­cor­po­ra­tion of the Ch into BC ma­trix through the in situ route. The cop­per re­moval ca­pac­ity of these mem­branes was an­a­lyzed and in situ pre­pared mem­brane showed the high­est val­ues, about 50%, for ini­tial con­cen­tra­tions of 50 and 250 mg L− 1. More­over, the reusabil­ity of the mem­branes was as­sessed.

This is the first time that the whole 3D nano-net­work BC mem­brane is used to pro­vide phys­i­cal in­tegrity for chi­tosan to de­velop eco-friendly mem­branes with po­ten­tial ap­pli­ca­tions in heavy metal re­moval.

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