A method of separating a metal organic framework (MOF) from a solution, comprising: providing a MOF containing solution which includes a MOF; contacting the MOF containing solution with an acoustic reflector surface; and applying a high frequency ultrasound of at least 20 kHz to the MOF containing solution, wherein the high frequency ultrasound is applied by a high frequency transducer; wherein the transducer and the acoustic reflector surface are spaced apart such that, any high frequency ultrasound applied within the MOF containing solution reflects off the acoustic reflector surface such that a standing wave is formed which forms pressure nodes and antinodes where particles are collected, thereby separating the MOF from solution as an aggregated sediment which settles out of solution; separating the aggregated sediment from the solution to form an isolated MOF, followed by at least one washing step including the steps of: adding the isolated MOF to a washing solution to produce a MOF containing washing solution; contacting the MOF containing washing solution with an acoustic reflector surface; and applying a high frequency ultrasound of at least 20 kHz to the MOF containing solution, wherein the high frequency ultrasound is applied by a high frequency transducer; wherein the transducer and the acoustic reflector surface are spaced apart such that, any high frequency ultrasound applied within the washing solution reflects off the acoustic reflector surface such that a standing wave is formed which forms pressure nodes and antinodes where particles are collected; thereby separating any contaminant from the MOF within the solution. providing a MOF containing solution which includes a MOF; contacting the MOF containing solution with an acoustic reflector surface; and applying a high frequency ultrasound of at least 20 kHz to the MOF containing solution, wherein the high frequency ultrasound is applied by a high frequency transducer; wherein the transducer and the acoustic reflector surface are spaced apart such that, any high frequency ultrasound applied within the MOF containing solution reflects off the acoustic reflector surface such that a standing wave is formed which forms pressure nodes and antinodes where particles are collected, thereby separating the MOF from solution as an aggregated sediment which settles out of solution; separating the aggregated sediment from the solution to form an isolated MOF, followed by at least one washing step including the steps of: adding the isolated MOF to a washing solution to produce a MOF containing washing solution; contacting the MOF containing washing solution with an acoustic reflector surface; and applying a high frequency ultrasound of at least 20 kHz to the MOF containing solution, wherein the high frequency ultrasound is applied by a high frequency transducer; wherein the transducer and the acoustic reflector surface are spaced apart such that, any high frequency ultrasound applied within the washing solution reflects off the acoustic reflector surface such that a standing wave is formed which forms pressure nodes and antinodes where particles are collected; thereby separating any contaminant from the MOF within the solution. adding the isolated MOF to a washing solution to produce a MOF containing washing solution; contacting the MOF containing washing solution with an acoustic reflector surface; and applying a high frequency ultrasound of at least 20 kHz to the MOF containing solution, wherein the high frequency ultrasound is applied by a high frequency transducer; wherein the transducer and the acoustic reflector surface are spaced apart such that, any high frequency ultrasound applied within the washing solution reflects off the acoustic reflector surface such that a standing wave is formed which forms pressure nodes and antinodes where particles are collected; thereby separating any contaminant from the MOF within the solution. <EOS>