2019, Vol.5 No.2 The cover picture shows the hierarchical porous N-doped carbon fabricated from the renewable biomass soft wood. The as-made porous N-doped carbon with large surface area can remove Cr(VI) in solution efficiently and rapidly. A part of Cr(VI) ions were reduced to Cr(III) due to the reduction effect of electro-donor groups. This hierarchical porous N-doped carbon is a promising candidate for the removal of other heavy metals from wastewater. More details are discussed in the article by Yan on page 180024.