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Printed Circuit Board-Derived Glass Fiber-Epoxy Resin-Supported Mo-Cu Bimetallic Catalyst for Glucose Synthesis.

ABSTRACT: A glass fiber-epoxy resin (GFER) framework derived from mixed waste printed circuit boards (MWPCBs) was utilized to prepare a cost-effective, reusable Mo-Cu bimetallic Bronsted-Lewis solid acid catalyst through wet-impregnation under near-infrared radiation (NIRR) activation. The efficacy of the novel Mo-Cu catalyst was assessed in the synthesis of glucose through hydrolysis of jute (Corchorus olitorius) fiber, and the process parameters were optimized (Mo precursor loading: 1.0 wt %, catalyst concentration: 5 wt %, hydrolysis temperature: 80 °C, and hydrolysis time: 10 min) through Taguchi orthogonal design. The GFER support and the prepared catalysts were characterized through thermogravimetric, X-ray diffraction (XRD), Fourier-transform infrared (FTIR), Brunauer-Emmett-Teller (BET)-density functional theory, and TPD analyses. The optimal Mo-Cu catalyst and the GFER support possessed 45.377 and 7.049 m2/g BET area, 0.04408 and 0.02317 cc/g pore volume, 1.9334 and 0.7482 nm modal pore size, and surface acidity of 0.48 and 0.40 mmol NH3/g catalyst, respectively. X-ray photoelectron spectroscopy bands confirmed the coexistence of Mo6+ and Cu2+ species; XRD and FTIR analyses indicated the presence of MoO3 and CuO crystalline phases in all prepared catalysts. The optimal catalyst prepared through NIRR (wavelength 0.75-1.4 ?m)-activated hydrothermal treatment resulted in a significantly greater glucose yield (75.84 mol %) than that achieved (53.64 mol %) using a conventionally prepared catalyst. Thus, an energy-efficient application of NIRR (100 W) could significantly improve catalytic properties over conventional hydrothermal treatment (500 W). The present investigation provides an innovative application of MWPCB-derived GFER as a promising cost-effective support for the preparation of highly efficient inexpensive solid catalysts for sustainable synthesis of glucose from low-cost waste jute fiber.

SUBMITTER: Barman S

PROVIDER: S-EPMC6643727 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature

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Printed Circuit Board-Derived Glass Fiber-Epoxy Resin-Supported Mo-Cu Bimetallic Catalyst for Glucose Synthesis.

Barman Sourav S Chakraborty Rajat R

ACS omega 20181227 12

A glass fiber-epoxy resin (GFER) framework derived from mixed waste printed circuit boards (MWPCBs) was utilized to prepare a cost-effective, reusable Mo-Cu bimetallic Bronsted-Lewis solid acid catalyst through wet-impregnation under near-infrared radiation (NIRR) activation. The efficacy of the novel Mo-Cu catalyst was assessed in the synthesis of glucose through hydrolysis of jute (<i>Corchorus olitorius</i>) fiber, and the process parameters were optimized (Mo precursor loading: 1.0 wt %, cat ...[more]

PMID: 31458422

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Project description:Printed circuit boards (PCBs) physically support and connect electronic components to the implementation of complex circuits. The most widespread insulating substrate that also acts as a mechanical support in PCBs is commercially known as FR4, and it is a glass-fiber-reinforced epoxy resin laminate. FR4 has exceptional dielectric, mechanical, and thermal properties. However, it was designed without considering sustainability and end-of-life aspects, heavily contributing to the accumulation of electronic waste in the environment. Thus, greener alternatives that can be reprocessed, reused, biodegraded, or composted at the end of their function are needed. This work presents the development and characterization of a PCB substrate based on poly(lactic acid) and cotton fabric, a compostable alternative to the conventional FR4. The substrate has been developed by compression molding, a process compatible with the polymer industry. We demonstrate that conductive silver ink can be additively printed on the substrate's surface, as its morphology and wettability are similar to those of FR4. For example, the compostable PCB's water contact angle is 72°, close to FR4's contact angle of 64°. The developed substrate can be thermoformed to curved surfaces at low temperatures while preserving the conductivity of the silver tracks. The green substrate has a dielectric constant comparable to that of the standard FR4, showing a value of 5.6 and 4.6 at 10 and 100 kHz, respectively, which is close to the constant value of 4.6 of FR4. The substrate is suitable for microdrilling, a fundamental process for integrating electronic components to the PCB. We implemented a proof-of-principle circuit to control the blinking of LEDs on top of the PCB, comprising resistors, capacitors, LEDs, and a dual in-line package circuit timer. The developed PCB substrate represents a sustainable alternative to standard FR4 and could contribute to the reduction of the overwhelming load of electronic waste in landfills.

Dataset Information

Printed Circuit Board-Derived Glass Fiber-Epoxy Resin-Supported Mo-Cu Bimetallic Catalyst for Glucose Synthesis.

Publications

Printed Circuit Board-Derived Glass Fiber-Epoxy Resin-Supported Mo-Cu Bimetallic Catalyst for Glucose Synthesis.

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