Development of only-phosphorus-based inhibitors for suppressing the formation of dibenzo-p-dioxins and dibenzofurans during de novo synthesis: A dual approach for preventing secondary pollution and stabilizing heavy metals

Xie，Feng1; Wang，Pengju1; Yan，Feng1,2; Shen，Xuehua1,2; Chen，Heijin1; Cai，Yingying1; Su，Yiping1; Jiao，Xianfeng3; Zhang，Zuotai1,2

2024-04-20

10.1016/j.jclepro.2024.142071

Journal of Cleaner Production   影响因子和分区

0959-6526

Although nitrogen–phosphorus- (N–P-) and nitrogen–sulfur-based (N–S-based) inhibitors can effectively suppress the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) during municipal solid waste incineration, secondary pollutants, including NO, NH, and SO may be generated. Therefore, developing novel green inhibitors is crucial. Herein, a series of only-phosphorus-based (only-P-based) inhibitors were systematically investigated in terms of the inhibitory effect on PCDD/F formation and the corresponding inhibition mechanism within a laboratory-scale system. Compared with N–P- and N–S-based inhibitors, most only-P-based inhibitors demonstrated higher efficiency in inhibiting PCDD/F formation, in the following order: KHPO (87.1%) > MgHPO·3HO (77.3%) > NaHPO (72.2%) > polyphosphoric ammonium (60.8%) > (NH)SO (44.4%). Furthermore, these inhibitors exhibited higher inhibition efficiency for highly chlorinated PCDD/F homologues than N–P- and N–S-based inhibitors. X-ray diffraction and thermogravimetric analysis coupled with mass spectroscopy confirmed that the inhibition mechanism of only-P-based inhibitors exclusively involves passivating the catalytic metal (CuCl). Moreover, no post-treatment secondary pollutants were detected, underscoring their environmental compatibility. Density functional theory calculations showed that further chlorination of lowly chlorinated PCDD/Fs is suppressed by obstructing CuCl catalysis during the Deacon reaction, thereby hindering the generation of Cl. Additionally, only-P-based inhibitors like MgHPO·3HO effectively immobilize heavy metals in real fly ash, enhancing their practical value. Thus, the inhibition mechanism and ecological virtues of only-P-based inhibitors were elucidated, which is essential for realizing their practical application.

density functional theory Dioxin Heavy metal Inhibition mechanism Suppressors containing phosphorus

SCI ; EI

英语

第一 ; 通讯

2-s2.0-85189677321

Scopus

1.School of Environmental Science and Engineering,Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,Southern University of Science and Technology,Shenzhen,518055,China
2.Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City,Shenzhen,518055,China
3.Shenzhen Energy Environment,Co.,LTD,Shenzhen,518055,China

Xie，Feng,Wang，Pengju,Yan，Feng,et al. Development of only-phosphorus-based inhibitors for suppressing the formation of dibenzo-p-dioxins and dibenzofurans during de novo synthesis: A dual approach for preventing secondary pollution and stabilizing heavy metals[J]. Journal of Cleaner Production,2024,451.

Xie，Feng.,Wang，Pengju.,Yan，Feng.,Shen，Xuehua.,Chen，Heijin.,...&Zhang，Zuotai.(2024).Development of only-phosphorus-based inhibitors for suppressing the formation of dibenzo-p-dioxins and dibenzofurans during de novo synthesis: A dual approach for preventing secondary pollution and stabilizing heavy metals.Journal of Cleaner Production,451.

Xie，Feng,et al."Development of only-phosphorus-based inhibitors for suppressing the formation of dibenzo-p-dioxins and dibenzofurans during de novo synthesis: A dual approach for preventing secondary pollution and stabilizing heavy metals".Journal of Cleaner Production 451(2024).