Lab-on-a-chip based total-phosphorus analysis device utilizing a photocatalytic reaction

Jung, Dong Geon; Jung, Daewoong; Kong, Seong Ho

doi:10.1016/j.sse.2017.10.026

Cited by 10 publications

(9 citation statements)

References 19 publications

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“…The proposed microfluidic chip used TiO 2 as photocatalyst by fabricating them in the pretreatment channel and fabricated photocatalyst (TiO 2 ) accelerated chemical reactions without consumed as a reactant and being produced as contaminants (it only produces H 2 O and CO 2 as by-products). The strong oxidizing effect of the TiO 2 during UV irradiation lowered the activation energy required for the decomposition of organic and inorganic compounds [39,50,51,52].…”

Section: Principle Of Tp Analysis Utilizing a Thermally Enhanced Pmentioning

confidence: 99%

“…In general, phosphorus (P) is the most important nutrient in living organisms and exists in the form of compounds in combination with other organic/inorganic substances [1,2,3,4,5]. However, as the concentration of phosphorus in the aquatic ecosystem increases, algae proliferation becomes active, and eutrophication of the aquatic ecosystem occurs [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39]. Therefore, in order to prevent eutrophication in advance, it is necessary to be able to monitor the concentration of phosphorus in aquatic ecosystem quickly and accurately.…”

Section: Introductionmentioning

confidence: 99%

“…The conventional TP pretreatment process utilizing autoclave is conducted under harsh conditions such as a temperature higher than 120 °C, pressure of more than 1.1 kg·cm −2 . Therefore, a conventional pretreatment equipment (autoclave) is mainly used in laboratory despite its bulky size, high cost, and its harsh pretreatment conditions such as high temperature and pressure [32,33,34,35,36,37,38,39]. It is especially difficult to minimize TP analysis or pretreatment system because of these harsh pretreatment conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In previous work, we suggested a TP analysis chip with a photocatalytic reaction for developing a portable TP analysis equipment. It has many advantages such as small size, low cost, and small-volume consumption of analytes, but it takes a long time (about 20~30 min) to analyze TP [39]. To solve these weaknesses, a moderate thermal energy is added to the pretreatment part with photocatalytic reaction in order to improve pretreatment efficiency in this work.…”

Section: Introductionmentioning

confidence: 99%

“…A photocatalytic reaction produces electron–hole pairs, which generate free radicals (hydroxyl radical in this study), when the photocatalyst absorbs ultra-violet (UV) radiation from sunlight or an artificial light source. In this paper, titanium dioxide (TiO 2 ) was used as the photocatalyst, and a UV light-emitting lamp with a wavelength of 365 nm was used as the light source [39,40,41,42,43,44,45,46,47,48,49]. In addition, a micro-heater was also installed in the proposed pretreatment channel with a photocatalyst for improving the efficiency of the photocatalytic reaction.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Total-Phosphorus (TP) Pretreatment Microfluidic Chip Based on a Thermally Enhanced Photocatalyst for Portable Analysis of Eutrophication

Jung

Kong

2019

Sensors

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To minimize conventional total-phosphorus (TP) analysis systems, TP pretreatment microfluidic chip is proposed and characterized in this paper. Phosphorus (P) is one of the most important elements in ecosystem but it causes the eutrophication due to its overdose. TP analysis systems are increasingly receiving attention as a means to prevent eutrophication. Even though conventional TP analysis systems have high accuracy and sensitivity, they are not frequently utilized outside the laboratory because of their bulky size, complicated pretreatment processes, long response times, and high cost. Thus, there is a growing need to develop portable TP analysis systems. The microfluidic chip in this study is proposed with the aim of simplifying and minimizing TP analysis by replacing the conventional pretreatment process with a new method employing a thermally enhanced photocatalytic reaction that can be applied directly to a microfluidic chip of small size. The fabricated TP pretreatment microfluidic chip with thermally enhanced photocatalyst (TiO2) was optimized compared to the conventional pretreatment equipment (autoclave). The optimum pretreatment conditions using the proposed chip were pretreatment time of 10 min and temperature of 75 °C. The optimized pretreatment process using the proposed microfluidic chip showed similar performance to the conventional pretreatment method, even with shorter pretreatment time. The shorter pretreatment time and small size are advantages that enable the TP analysis system to be minimized. Therefore, the proposed TP pretreatment microfluidic chip based on thermally enhanced photocatalytic reaction in this study will be utilized to develop a portable TP analysis system.

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Section: Principle Of Tp Analysis Utilizing a Thermally Enhanced Pmentioning

confidence: 99%