Sains Malaysiana 54(11)(2025): 2721-2731

http://doi.org/10.17576/jsm-2025-5411-12

 

Distinct Degradation Behaviors of Gaseous H₂O₂ and Benzene in NaOH-MnSO₄, MnO₂, and KI Systems

(Kelakuan Degradasi Berbeza bagi Gas H₂O₂ dan Benzena dalam Sistem NaOH-MnSO₄, MnO₂ dan KI)

 

YUPING JIANG*, ANDONG ZHU & SHIMIN WU

 

University of Electronic Science and Technology of China, Zhongshan Institute, China

 

Received: 23 May 2025/Accepted: 7 November 2025

 

Abstract

Gas-phase H₂O₂ ([H₂O₂]_g) degradation is crucial yet insufficiently characterized, particularly under pollutant coexistence conditions. This study innovatively investigates the degradation behaviors of [H₂O₂]_g and [benzene]_g using NaOH-MnSO₄ solution, MnO₂ catalyst particles, and KI solution systems. Experimental results demonstrate: fluorinated ethylene propylene (FEP) materials effectively mitigate system transfer losses. Under both isolated and coexisting conditions, NaOH-MnSO₄ and KI solutions maintained high [H₂O₂]_g degradation efficiency (>90%). However, KI's [benzene]_g removal rate plummeted from 14% to 4%, while competitive [benzene]_g adsorption reduced MnO₂'s [H₂O₂]_g removal efficiency from 90% to 52%, with [benzene]_g removal remaining constant. A unique anti-synergistic effect was identified in the NaOH-MnSO₄/MnO₂ system, hypothesized to result from rapid hydroxyl radical annihilation under high alkalinity and H₂O₂ concentration. Cross-validated pH monitoring and UV-Vis spectroscopy suggest H₂O₂-induced iodide depletion in the KI system substantially weakens hydrogen bond-mediated benzene solubilization. Spectral analysis further showed excessive H₂O₂ masks benzene's characteristic peaks, while emerging absorption bands confirm intermediate product formation during oxidation.

Keywords: Benzene; hydrogen peroxide; hydroxyl radical; removal efficiency; synergistic effect

 

Abstrak

Degradasi H₂O₂ ([H₂O₂]_g) fasa gas adalah penting tetapi tidak dicirikan dengan secukupnya, terutamanya di bawah keadaan kewujudan bersama bahan pencemar. Penyelidikan ini secara inovatif mengkaji tingkah laku degradasi [H₂O₂]_g dan [benzena]_g menggunakan larutan NaOH-MnSO₄, zarah pemangkin MnO₂ dan sistem larutan KI. Keputusan uji kaji menunjukkan bahan etilena propilena (FEP) berfluorinasi berkesan mengurangkan kehilangan pemindahan sistem. Di bawah kedua-dua keadaan terpencil dan wujud bersama, larutan NaOH-MnSO₄ dan KI mengekalkan kecekapan degradasi [H₂O₂]_g yang tinggi (>90%). Walau bagaimanapun, kadar penyingkiran [benzena]_g KI menurun mendadak daripada 14% kepada 4%, manakala penjerapan [benzena]_g yang kompetitif mengurangkan kecekapan penyingkiran [H₂O₂]_g MnO₂ daripada 90% kepada 52% dengan penyingkiran [benzena]_g kekal malar. Kesan anti-sinergi yang unik telah dikenal pasti dalam sistem NaOH-MnSO₄/MnO₂ yang dihipotesiskan sebagai hasil daripada pemusnahan radikal hidroksil yang cepat di bawah kealkalian yang tinggi dan kepekatanH₂O₂. Pemantauan pH yang disahkan silang dan spektroskopi UV-Vis menunjukkan bahawa penipisan iodida yang disebabkan oleh H₂O₂ dalam sistem KI secara ketara melemahkan pelarutan benzena yang dimediasi ikatan hidrogen. Analisis spektrum selanjutnya mendedahkanH₂O₂ yang berlebihan menutupi puncak ciri benzena, manakala jalur penyerapan yang muncul mengesahkan pembentukan produk perantaraan semasa pengoksidaan.

Kata kunci: Benzena; hidrogen peroksida; kecekapan penyingkiran; kesan sinergi; radikal hidroksil

 

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*Corresponding author; email: jyp@zsc.edu.cn