Article Per Year (5 Year)
p-Index From 2021 - 2026
0.408
P-Index
This Author published in this journals
All Journal Journal of Chemical Engineering Research Progress
Guk Chol Kim
Faculty of Energy Science, Kim II Sung University, Pyongyang 999093
Chemical Engineering, Chemistry & Bioengineering Energy Engineering Materials Science & Nanotechnology

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Lignite-Derived Activated Carbon: A Superior, Low-Cost Alternative to Coconut-Shell GAC for Tributyl Phosphate (TBP) Adsorption from Wastewater Guk Chol Kim; Jong Hyok Kim; Yong A. Choe; Jin Song O
Journal of Chemical Engineering Research Progress 2026: JCERP, Volume 3 Issue 2 Year 2026 (December) (Issue in Progress)
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/jcerp.20715

Abstract

This study examined the use of local lignite-based and walnut shell-based GACs as potential low-cost alternatives to the imported coconut shell-based GACs for the removal of TBP from wastewaters in Zr alloy production. The lignite-based GAC steam activated showed that the surface groups consisted of –OH, C=C, and C–O–C and that it had a predominantly mesoporous structure (65% mesopores and 20% micropores). At a solid-to-liquid ratio of 1:100 and an initial concentration of 400 mg/L of TBP, the GAC derived from lignite adsorbed 38.7 mg/g with an efficiency of 96.2%. This result was comparable to the coconut shell GAC, which adsorbed 39.8 mg/g with an efficiency of 99.5%. The walnut shell GAC had a slightly higher adsorption capacity than the other two GACs, with 39.7 mg/g and an efficiency of 99.6%. In all cases, equilibrium was reached in 120 min, while the literature usually reports 150–180 min. This may be because the intraparticle diffusion is accelerated when the mesopore content is high; in this GAC, the mesopores accounted for 65% of the volume. This kinetic advantage distinguishes domestically produced GACs from predominantly microporous coconut-shell GAC. Economically, lignite-derived GAC showed superior cost-effectiveness, with a production cost less than one-fifth that of imported coconut-shell GAC. The economic effectiveness index clearly favoured domestically produced GACs. Lignite-derived GAC, originally used almost exclusively for gas purification, was successfully validated for liquid-phase TBP removal, an application with no prior example. Thus, domestically produced lignite-derived GAC is an effective, low-cost alternative to imported coconut-shell GAC for TBP removal from Zr alloy production wastewater. Copyright © 2026 by Authors, Published by Universitas Diponegoro and BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Br-LMG/PVB Film: A Novel UVC Dosimeter for Process Monitoring in Chemical and Environmental Engineering Guk Chol Kim; Kye Ryong Ri; Song Taek Kim; Jong Hyok Kim
Journal of Chemical Engineering Research Progress 2026: JCERP, Volume 3 Issue 2 Year 2026 (December) (Issue in Progress)
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/jcerp.20725

Abstract

In chemical engineering processes such as photocatalytic wastewater treatment, cooling water biofouling control, and filling line surface sterilization, confirming UVC dose is critical for process efficiency and safety. However, existing UVC dosimeters rely on complex equipment, acid generators, or high cost, limiting field deployment. This study fabricated a UVC dosimeter based on polyvinyl butyral (PVB) film containing bromo-leuco malachite green (Br-LMG) without any acid generator, and evaluated its dosimetric characteristics for 253.7 nm dose monitoring. Br-LMG/PVB films were prepared by spin-coating and irradiated with UVC doses of 0, 25, 50, 75, 100, 200, and 300 mJ/cm². Changes in optical density, dose-response linearity, post-irradiation stability (30 min and 30 days), and colour difference (ΔE) based on CIE L*, a*, b* were quantified using UV-VIS spectrophotometry and reflectance spectroscopy. Upon UVC irradiation, the film exhibited a maximum absorption peak at 630 nm corresponding to the oxidized form of malachite green. The dose-response curve showed excellent linearity (R² ≈ 1) over 0-300 mJ/cm² with sensitivity of 0.0031 (mJ/cm²)-¹ at 630 nm. After 30 days of room-temperature storage, optical density increased by only 5.2-9.2% without fading. ΔE exceeded 10 at 25 mJ/cm² (perceptible) and reached 18 at 50 mJ/cm² (clearly distinguishable by naked eye). The Br-LMG/PVB film serves as a simple, low-cost, field-deployable UVC dosimeter requiring no additional equipment for dose assessment in chemical and environmental engineering applications. Copyright © 2026 by Authors, Published by Universitas Diponegoro and BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors Jin Song O Jong Hyok Kim Kye Ryong Ri Song Taek Kim Yong A. Choe