Polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F) emission is one of main concerns for the secondary pollution of municipal solid waste incinerators (MSWI). For timely response to emission, 1,2,4-trichlorobenzene (1,2,4-TrClBz) as dioxin indicator can be monitored via online measurement techniques. In this study, multi-walled carbon nanotubes (MWCNTs) were investigated for their suitability as a 1,2,4-TrClBz sorbent for MSWI stack gas analysis. The tests include, batch adsorption, continuous adsorption-desorption of 1,2,4-TrClBz via thermal desorption coupled with gas chromatography (TD-GC-ECD), temperature and concentration stability of MWCNTs, and adsorption performance of the system. Thermogravimetric/derivative thermogravimetric (TGA/DTG) analysis reveals that MWCNTs has higher capacity in terms of weight loss (14.34%) to adsorb 1,2,4-TrClBz compared to Tenax TA (9.46%) and also shows fast desorption of adsorbate at temperature of 87 ºC compared to Tenax TA (130 ºC). Interestingly, carbon nanotubes and Tenax TA gave almost similar adsorption-desorption response, and from TD-GC-ECD analysis it was found that with increasing mass flow of 1,2,4-TrClBz (7.42 × 10⁻⁶ - 44.52 × 10⁻⁶ mg ml⁻¹) through sorbent traps, average peak areas increased from 2.86 ± 0.02 to 13.54 ± 0.26 for MWCNTs and 2.89 ± 0.02 to 13.38 ± 0.12 for Tenax TA, respectively. The stability of MWCNTs for temperature was 400 ºC and for concentration of 1,2,4-TrClBz was 50 ppbv. However, regeneration of sorbent at 100 ppbv (1,2,4-TrClBz) was not possible. TD-GC-ECD system showed high adsorption performance with 3.86% and 3.59% relative standard deviation at 250 ºC and 300 ºC, respectively. Further Fourier Transform Infrared Spectroscopy (FTIR) analysis confirmed that adsorbate can be fully desorbed at 300 ºC.

多氯联苯对二恶英和二苯并呋喃（PCDD / F）排放是城市生活垃圾焚烧炉（MSWI）二次污染的主要问题之一。为了及时响应排放，可以通过在线测量技术监测作为二恶英指示剂的1,2,4-三氯苯（1,2,4-TrClBz）。在这项研究中，研究了多壁碳纳米管（MWCNT）作为1,2,4-TrClBz吸附剂对MSWI烟道气分析的适用性。测试包括分批吸附，通过热脱附与气相色谱法（TD-GC-ECD）对1,2,4-TrClBz进行连续吸附-脱附，MWCNT的温度和浓度稳定性以及系统的吸附性能。热重/导数热重分析（TGA / DTG）分析表明，MWCNT在重量减轻方面（14.34％）具有吸附1,2，的能力，与Tenax TA（9.46％）相比，4-TrClBz表现出与Tenax TA（130ºC）相比，在87ºC的温度下吸附物快速脱附。有趣的是，碳纳米管和Tenax TA几乎具有相似的吸附-解吸响应，并且从TD-GC-ECD分析发现，随着1,2,4-TrClBz的质量流量增加（7.42×10^-6 - 44.52×10 ^-6毫克毫升^-1）通过吸附剂陷阱，平均峰面积从2.86±0.02分别增加至13.54±0.26对多壁碳纳米管和2.89±0.02 13.38到±0.12对的Tenax TA，。MWCNT的温度稳定性为400ºC，1,2,4-TrClBz的浓度为50 ppbv。但是，不可能以100 ppbv（1,2,4-TrClBz）再生吸附剂。TD-GC-ECD系统显示出高吸附性能，在250ºC和300ºC时的相对标准偏差分别为3.86％和3.59％。进一步的傅立叶变换红外光谱（FTIR）分析证实，被吸附物可以在300ºC下完全解吸。