<p>This second volume of <em>Metal-Organic Framework Composites</em> focusses on water pollution as a major concern and endangerment to human health and the application of MOFs for remediation. Metal-organic frameworks (MOFs) are advanced porous materials and are promising adsorbents with facile modifications, high specific surface area, controllable porosity, and tailored surface properties. The authors systematically cover the synthesis of ZIF-8 base composites and discuss the role of ZIF-8 composites in water decontamination as an adsorbent and photocatalyst. </p>