University Of Tasmania
152250-Fabrication of a smartphone-based spectrophotometer and its application in monitoring concentrations of organic dyes.pdf (1.81 MB)

Fabrication of a smartphone-based spectrophotometer and its application in monitoring concentrations of organic dyes

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journal contribution
posted on 2023-05-21, 11:47 authored by Koohkan, R, Kaykhaii, M, Sasani, M, Brett PaullBrett Paull
In this study, an in-house constructed paper-based spectrophotometer is presented and demonstrated for detecting three organic dyes, namely, methylene blue, malachite green, and rhodamine B, and monitoring the efficiency of their removal from a wastewater sample with Sistan sand as a costless adsorbent. The compact design and light weight of this simple spectrophotometer delivered portability, with materials costing less than a dollar. Spectral analysis of the captured images was performed using free downloadable software from the Google Play store. The main experimental parameters affecting the efficiency of dye adsorption including pH, sorbent dosage, initial dye concentration, and contact time were investigated and optimized using the Taguchi design experimental method. Validation experiments were performed using a standard commercial bench-top spectrophotometer, and results were compared in terms of analytical performance, speed, and cost of analysis. The smartphone-based spectrometer was able to measure accurately, as confirmed using the commercial spectrometer, with enhanced sensitivity for methylene blue and rhodamine B. The combination of the high spectral accuracy of the paper-based spectrophotometer, together with sand as a readily accessible sorbent, enabled us to develop a powerful yet simple approach and tool for the removal and monitoring of dyes within wastewater samples, which is potentially available to everybody who owns a smartphone.


Publication title

ACS Omega










School of Natural Sciences


American Chemical Society

Place of publication

United States

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© 2020 American Chemical Society. This is an open access article published under an ACS AuthorChoice License,

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  • Open

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Expanding knowledge in the chemical sciences

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