SEM (first column), TEM (second column) and the corresponding EDS element mapping images of a,a1,a2) ZIF(Zn)/SiO2@SiO2+PDA, b,b1,b2) ZIF(Zn, Mn)/SiO2@SiO2+PDA, c,c1,c2) ZIF(Zn, Co)/SiO2@SiO2+PDA, d,d1,d2) ZIF(Zn, Ni)/SiO2@SiO2+PDA, e,e1,e2) ZIF(Zn, Cu)/SiO2@SiO2+PDA, f,f1,f2) ZIF(Zn)@HMCSs, g,g1,g2) ZIF(Zn, Mn)@HMCSs, h,h1,h2) ZIF(Zn, Co)@HMCSs, i,i1,i2) ZIF(Zn, Ni)@HMCSs, and j,j1,j2) ZIF(Zn, Cu)@HMCSs. SEM (penultimate column), TEM (last column) images of k,k1) NC (Zn)/ HMCSs, l,l1) NC(Zn, Mn)/HMCSs, m,m1) NC(Zn, Co)/HMCSs, n,n1) NC (Zn, Ni)/HMCSs, o,o1) NC(Zn, Cu)/HMCSs, p,p1) NC(Zn)@HMCSs, q,q1) NC(Zn, Mn)@HMCSs, r,r1) NC(Zn, Co)@HMCSs, s,s1) NC(Zn, Ni)@HMCSs, and t,t1) NC(Zn, Cu)@HMCSs.