Mechanochemical degradation of hexabromocyclododecane and approaches for the remediation of its contaminated soil

Zhang, Kunlun; Huang, Jun; Wang, Haizhu; Liu, Kai; Yu, Gang; Deng, Shubo; Wang, Bin

doi:10.1016/j.chemosphere.2014.02.006

Cited by 50 publications

(16 citation statements)

References 27 publications

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“…7. As can be seen, the peaks at around 2800-3000 cm À1 , 1400-1470 cm À1 , and 500-700 cm À1 come from the vibration of n(C-H), d(CH 2 ), and n(C-Br), 25 respectively, which can be found in the spectra of HBCD. However, all of these peaks disappeared in the spectra of the 1 h milled and 2 h milled samples and a new peak at around 671 cm À1 appeared, which was assigned to Na 2 SO 4 .…”

Section: Mechanism Of the Reactionmentioning

confidence: 91%

Disposal of hexabromocyclododecane (HBCD) by grinding assisted with sodium persulfate

Yan

Liu

et al. 2017

RSC Adv.

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Section: Mechanism Of the Reactionmentioning

confidence: 91%

Disposal of hexabromocyclododecane (HBCD) by grinding assisted with sodium persulfate

Yan

Liu

et al. 2017

RSC Adv.

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“…However, the molecular structure of HBCD with a ring structure is relatively stable, making it heat-resistant, UV-resistant, and difficult to be decomposed in the natural environment [5]. Methods for eliminating HBCD in the environment include microbial degradation, ultrasonic degradation, chemical reduction, phytoremediation, and mechanical ball milling [6][7][8]. However, these methods have not been practically used because of the harsh reaction conditions, high energy consumption, low efficiency, and secondary pollution [9,10].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Photocatalytic Degradation of Hexabromocyclododecane in Water by UV/TiO2/persulfate

Wang

Fang³

et al. 2019

Catalysts

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In this work, the elimination of hexabromocyclododecane (HBCD) is explored by using photodegradation of the UV/TiO2 system, the UV/potassium persulfate (KPS) system, and the homo/heterogeneous UV/TiO2/KPS system. The experimental results show that the dosages of TiO2 and potassium persulfate have optimum values to increase the degradation degree. HBCD can be almost completely degraded and 74.3% of the total bromine content is achieved in the UV/TiO2/KPS homo/heterogeneous photocatalysis, much more than in the UV/persulfate system and the UV/TiO2 system. Roles of radicals SO4•− and OH• in the photocatalysis systems are discussed based on experimental measurements. The high yield of the concentration of bromide ions and decreased pH value indicates that synergistic effects exist in the UV/TiO2/KPS homo/heterogeneous photocatalysis, which can mineralize HBCD into inorganic small molecules like carboxylic acids, CO2 and H2O, thus much less intermediates are formed. The possible pathways of degradation of HBCD in the UV/TiO2/KPS system were also analyzed by GC/MS. This work will have practical application potential in the fields of pollution control and environmental management.

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“…Due to its carcinogenicity, potential toxicity, and long-term persistence in the environment [ 5 , 6 ]. HCB contamination of soils presently poses a serious problem all over the world, including the USA, Japan [ 7 ], Germany [ 8 ], Australia [ 9 ], Brazil [ 10 ], and China. In 2001, HCB was classified as one of 12 ‘persistent organic pollutants’ (POPs) by the United Nations Environmental Program (UNEP).…”

Section: Introductionmentioning

confidence: 99%

Dechlorination of Hexachlorobenzene in Contaminated Soils Using a Nanometallic Al/CaO Dispersion Mixture: Optimization through Response Surface Methodology

Jiang

Shang

et al. 2018

IJERPH

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Hexachlorobenzene (HCB) contamination of soils remains a significant environmental challenge all over the world. Reductive stabilization is a developing technology that can decompose the HCB with a dechlorination process. A nanometallic Al/CaO (n-Al/CaO) dispersion mixture was developed utilizing ball-milling technology in this study. The dechlorination efficiency of HCB in contaminated soils by the n-Al/CaO grinding treatment was evaluated. Response surface methodology (RSM) was employed to investigate the effects of three variables (soil moisture content, n-Al/CaO dosage and grinding time) and the interactions between these variables under the Box-Behnken Design (BBD). A high regression coefficient value (R2 = 0.9807) and low p value (<0.0001) of the quadratic model indicated that the model was accurate in predicting the experimental results. The optimal soil moisture content, n-Al/CaO dosage, and grinding time were found to be 7% (m/m), 17.7% (m/m), and 24 h, respectively, in the experimental ranges and levels. Under optimal conditions, the dechlorination efficiency was 80%. The intermediate product analysis indicated that dechlorination was the process by stepwise loss of chloride atoms. The main pathway observed within 24 h was HCB → pentachlorobenzene (PeCB) → 1,2,3,4-tetrachlorobenzene (TeCB) and 1,2,4,5-TeCB. The results indicated that the moderate soil moisture content was crucial for the hydrodechlorination of HCB. A probable mechanism was proposed wherein water acted like a hydrogen donor and promoted the hydrodechlorination process. The potential application of n-Al/CaO is an environmentally-friendly and cost-effective option for decontamination of HCB-contaminated soils.

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Mechanochemical degradation of hexabromocyclododecane and approaches for the remediation of its contaminated soil

Cited by 50 publications

References 27 publications

Disposal of hexabromocyclododecane (HBCD) by grinding assisted with sodium persulfate

Disposal of hexabromocyclododecane (HBCD) by grinding assisted with sodium persulfate

Synergistic Effect of Photocatalytic Degradation of Hexabromocyclododecane in Water by UV/TiO2/persulfate

Dechlorination of Hexachlorobenzene in Contaminated Soils Using a Nanometallic Al/CaO Dispersion Mixture: Optimization through Response Surface Methodology

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