Dimethylamine borane

Lipase and zinc nitrate
hexahydrate were purchased from Thermo Fisher Scientific (U.K.). Disodium
monohydrogen phosphate, sodium dihydrogen phosphate, ethanol, curcumin,
ammonium tetrachloropalladate, dimethylamine borane (DMAB), methylene
blue (MB), and phenol were purchased from Sigma-Aldrich (U.K.). Graphene
oxide (GO) was synthesized in our lab (shown in the Supporting Information). All chemicals were used as received.
Kapok fibers and cotton fibers were picked in Nanning, China.

All reagents were used as purchased without further purification. Potassium tetrachloroplatinate(II) (K₂PtCl_4, 98%), sodium tetrachloropalladate(II) (Na₂PdCl₄, 98%), sodium hexachlororhodate(III) (Na₃RhCl₆), ruthenium(III) chloride hydrate (RuCl₃·xH₂O, 99.98% trace metals basis), palladium(II) chloride (PdCl₂, ≥99.9%), copper(II) chloride dihydrate (CuCl₂·2H₂O, ≥99.0%), nickel(II) chloride hexahydrate (NiCl₂·6H₂O, ≥97%), cobalt(II) chloride hexahydrate (CoCl₂·6H₂O, ≥97%), sodium molybdate dihydrate (Na₂MoO₄·2H₂O, ≥99%), L-AA (99%), dimethylamine borane (97%), hydrazine monohydrate (N₂H₄·H₂O, N₂H₄ 64–65%, reagent grade, 98%), and Nafion™ perfluorinated resin solution (5 wt% in mixture of lower aliphatic alcohols and water, contains 45% water) were purchased from Sigma Aldrich. The block copolymers, polystyrene-b-poly(ethylene oxide) (PS₅₀₀₀-b-PEO₂₂₀₀), poly(ethylene oxide)-b-poly(methyl methacrylate) (PEO-b-PMMA) with different molecular weights of PMMA blocks, including PEO₁₀₀₀₀-b-PMMA₅₅₀₀, PEO₁₀₅₀₀-b-PMMA₁₈₀₀₀ and PEO₁₀₅₀₀-b-PMMA₂₂₀₀₀ (the subscript numbers indicate the average molecular weight (g mol^–1) of the corresponding blocks), were obtained from Polymer Source. DMF, Tetrahydrofuran (THF), and acetone were purchased from Nacalai Tesque, Inc.