Journals / Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi / 2019 / Cilt: 34 - Sayı: 2

Mechanochemical declorination of hexachlorocyclohexane isomers by planetary ball mill in the presence of metal oxides

Hegzaklorosiklohegzan izomerlerinin metal oksit varlığında gezegen hareketli bilyeli değirmen kullanılarak mekanokimyasal deklorinasyonu

Pages
739–750
Publication Date
2022-10-18
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The results show that HCH isomers can be completely destroyed after 600 min grinding time in a mixture with a HCH/FA ratio of 1:20 (m/m).

📌 3 Key Takeaways

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Objective & Hypothesis:Although the use of hexachlorocyclohexane (HCH, C6H6Cl6) is currently prohibited, the remaining production stocks of HCH are still present.
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Key Findings & Data:The results show that HCH isomers can be completely destroyed after 600 min grinding time in a mixture with a HCH/FA ratio of 1:20 (m/m).
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Conclusion & Impact:Based on this study, mechanochemical dechlorination of HCH isomers is a eco-friendly technology alternative to thermal treatment and biotic degradation applications.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Although the use of hexachlorocyclohexane (HCH, C6H6Cl6) is currently prohibited, the remaining production stocks of HCH are still present. Recent investigations have shown that mechanochemical dechlorination is a promising method to degrade HCH. However, the mechanochemical dechlorination method still needs further investigations. For this reason, in this study, mechanochemical dechlorination of HCH isomers were investigated for the first time by using coal fly ash (FA) and refractory brick waste (RB) which contain various metal oxides. The mechanochemical dechlorination process was carried out at room temperature using a planetary ball mill and the gas chromatograph with electron capture detector (GC-ECD) was used to determine the degradation efficiency. The results show that HCH isomers can be completely destroyed after 600 min grinding time in a mixture with a HCH/FA ratio of 1:20 (m/m). The conversion rate of chlorine to water soluble chlorine is 52%. At the end of the process, the ball temperatures increased up to 105oC and the mixture temperatures of reagent + HCH were continuously increased with the process time. Tetrachlorobenzenes (TeCBz) and trichlorobenzenes (TCBz) are the isomers detected during the dechlorination. Based on this study, mechanochemical dechlorination of HCH isomers is a eco-friendly technology alternative to thermal treatment and biotic degradation applications.

Özet

Zararlı etkilerinden dolayı günümüzde hegzaklorosiklohegzan (HCH, C6H6Cl6) kullanımı yasaklanmış olsada geçmişten kalan üretim stokları hala mevcuttur. Son araştırmalar mekanokimyasal deklorinasyonprosesinin HCH’ın gideriminde umut vaat eden bir yöntem olduğunu göstermiştir. Ancak mekanokimyasaldeklorinasyon prosesinin geçerli bir yöntem olabilmesi için daha fazla araştırmaya ihtiyaç duyulmaktadır.Bu amaçla mevcut çalışmada; içeriğinde çeşitli metal oksitler bulunduran uçucu kömür külü (UK) verefrakter tuğla atığı (RT) kullanılarak hegzaklorosiklohegzan (HCH) izomerlerinin mekanokimyasaldeklorinasyonu ilk defa araştırılmıştır. Mekanokimyasal deklorinasyon prosesi oda sıcaklığında gezegenhareketli bilyeli değirmende gerçekleştirilmiş ve giderim veriminin belirlenmesi amacıyla elektron yakalamadedektörlü gaz kromatografi (GC-ECD) cihazı kullanılmıştır. Sonuçlar 1:20 (m/m) oranında HCH: UKkullanılarak 600 dk. sonunda HCH izomerlerinin tamamıyla giderildiğini göstermiştir. Organik klorun sudaçözünür klora dönüşüm oranı ise %52’dir. Proses sonunda bilye sıcaklıkları 105oC’ye kadar yükselmiş vereaktif+HCH karışım sıcaklıkları da proses süresi ile birlikte sürekli olarak artmıştır. Tetraklorobenzenler(TeKBz) ve triklorobenzenler (TKBz) ise deklorinasyon sırasında tespit edilen izomerlerdir. Çalışmasonuçlarına göre HCH izomerlerinin mekanokimyasal deklorinasyonu, termal arıtma ve biotik parçalamauygulamalarına alternatif çevre dostu bir teknolojidir.

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Cite This Article

PELİTLİ, V., KURT, U., CANLI, O. (2022). Mechanochemical declorination of hexachlorocyclohexane isomers by planetary ball mill in the presence of metal oxides. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi, Cilt: 34 - Sayı: 2, 739–750. https://ajindex.com/articles/523506

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References (13)

  1. Breivik K., Pacyna J.M., Munch J., Use of α-, β-, γhexachlorocyclohexane in Europe, 1970–1996, Science of the Total Environment, 239, 151–163, 1999
  2. Li Y.F., Global technical hexachlorocyclohexane usage and its contamination consequences in the environment: from 1948-1997, Science of The Total Environment, 232, 121-158, 1999
  3. Metcalf R.L., The Mode of Action of Organic Insecticides, National Research Council, Washington D.C., ABD, 1948
  4. Matolcsy G., Nadasy M., Andriska V., Studies in Environmental Science 32: Pesticide Chemistry, Elsevier Science, New York, ABD, 1988
  5. Willet K.L., Utrich E.M., Hites R.A., Differential toxicity and environmental facts of hexachlorocyclohexane isomers, Environmental Science & Technology, 32, 2197–2207, 1998
  6. Hauzenberger I., Reports on Substances Scheduled for Re-Assessments under the UNECE POPs Protocol, Technical Review Report on Lindane, Federal Environment Agency, Avusturya, 2004
  7. UNEP, Report of the Conference of the parties of the Stockholm convention on persistent organic pollutants on the work of its fourth meeting. In: Conference of the Parties of the Stockholm Convention on Persistent Organic Pollutants Fourth Meeting, Secretariat of the Stockholm Convention, Geneva, İsviçre, 2009
  8. OSPAR, 2006. Commission Protecting and conserving the North-East Atlantic and its resources. http://www.ospar.org/convention. Erişim tarihi Ağustos 11, 2016
  9. Jit S., Dadhwal M., Kumari H., Jindal S., et al., Evaluation of hexachlorocyclohexane contamination from the last lindane production plant operating in India, Environmental Science Pollution Research, 18, 586- 597, 2011
  10. POPRC, Draft Risk Profile for BetaHexachlorocyclohexane. Secretariat of the Stockholm Convention POPs Review Committee, 31, Geneva, İsviçre, 2007
  11. Vijgen J., The legacy of lindane HCH isomer production: A global overview of residue management, formulation and disposal. International HCH and Pesticides Association, 26, Denmark, 2006
  12. Jürgens H.J., Roth R., Case Study and Proposed Decontamination Steps of the Soil and Groundwater Beneath a Closed Herbicide Plant in Germany, Chemosphere, 18, 1163-1169, 1989
  13. Olie,K., Coenraads, P.J., Tang N.J., Luksemburg, W.J., Wong A.S., Occupational Contamination with PCDD/F’s During Recycling of Non-Gamma HCH in a Chinese Chemical Factory. Part IV Comparison of Samples in and Outside the Factory with Isomer and Congener Patterns, 22nd International Symposium on Halogenated Environmental O