Recrystallisation of dibenzylideneacetone
Armarego's Purification of Laboratory Chemicals suggests using dichlormethane–hexane pair instead of ethanol–water; it also lists crystallization from warm ethyl acetate, ethanol or petroleum ether as alternative [1, p. 342]. 


  Dibenzalacetone [DBA, bda, trans-trans-1,5-diphenyl-1,4-dien-3-one, 1,5-(bisphenyl)-penta-1E,4E-diene-3-one] [538-58-9] $\ce{C17H14O}$, $M~234.3$, $m~107°$, $111°$, $112°$, $113°$, $120-122°$.
  Purify the ketone by flash chromatography (150 mesh $\ce{Al2O3}$ deactivated with $6\%$ v/w $\ce{H2O}$) using  petroleum ether $40-60°/\ce{EtOAc}$ ($4/1$, v/v), and the yellow solid is recrystallised by layering a concentrated $\ce{CH2Cl2}$ solution with hexane (i.e. $\ce{CH2Cl2}$/hexane, $1:4$, v/v).
  Also recrystallise the ketone from hot ethyl acetate $(\pu{2.5 ml/g})$ or $\ce{EtOH}$.
  It has been also crystallised from petroleum ether b $30-60°$. 


References


Armarego, W. L. Purification of Laboratory Chemicals; Elsevier: Boston, MA, 2017. ISBN 978-0-12-805457-4.