This manuscript reports the preparation of a large area (84 cm²) desalination membrane based on multilayers (11 nm thickness) of B,N-codoped defective graphene. The process consists of coating a porous ceramic α-Al₂O₃ support (100 nm pore size) with a continuous nanometric (50 nm) chitosan film containing adsorbed (NH₄)₃BO₃. Subsequent pyrolysis in the presence of hydrogen converts chitosan into multilayer defective B,N-codoped graphene. The partial removal of B and N dopant atoms by H₂ during the pyrolysis causes the generation of subnanometric pores due to atom vacancy, as determined by control experiments in the absence of this gas. A NaCl and KCl removal efficiency from brackish water higher than 95 % for a permeate flux of 24.3 L m^-2 h^-1 at 10 bars were achieved.

该手稿报道了基于多层B，N掺杂缺陷石墨烯（厚度为11 nm）的大面积（84 cm ²）淡化膜的制备。该过程包括涂覆的多孔陶瓷的α-Al的₂ ö ₃载体（100纳米孔径）用连续的纳米（50纳米）脱乙酰壳多糖的含吸附膜（NH ₄）₃ BO ₃。随后在氢存在下的热解将壳聚糖转化为多层有缺陷的B，N掺杂的石墨烯。H ₂部分去除B和N掺杂原子在热解过程中，由于原子空位而导致产生亚纳米孔，这是在没有这种气体的情况下通过对照实验确定的。对于10 bar的24.3 L m ^-2 h ^-1的渗透通量，从微咸水中去除NaCl和KCl的效率高于95％。