Recycling one pound of aluminum (33 cans) saves about 7 kilowatt-hours (kWh) of electricity. With the energy it takes to make just one new aluminum can from bauxite ore, you can make 20 recycled aluminum cans.
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The Boc groups of pendant amino acids in the cross-linked gels were removed using TFA to obtain hydrogels with free primary ammonium ions (-NH3+). In a typical example, 100 mg of each gel was soaked in 5 mL of TFA for 48 h.