The invention relates to ecosustainable and biocompatible, low cost, ambient friendly electronic and optoelectronic devices, such as transistors and light-emitting transistors, made with silk fibroin or blended with other biopolymers, methods for fabrication and methods of using the silk-based electronics and optoelectronics. The hooks are located upon an upper region of the T-shaped member and are spaced substantially equidistant from each other on opposite sides of the upper region of said T-shaped member, the clip being located upon opposite side of T-shaped member from the hooks. The flow channels guide filtering media to filter the inlet gas, and then the filtered gas is exhausted through the gas exhaust outside of the granular bed filtration system. , polymers produced from acrylate and methacrylate esters, colored polystyrenes, and similar colored polymeric materials derived from other ethylenically-unsaturated monomers.