Nitrogen-doping positively whilst sulfur-doping negatively affect the catalytic activity of biochar for the degradation of organic contaminant

Ding, Dahu; Yang, Shengjiong; Qian, Xiaoyong; Chen, Liwei; Cai, Tianming

doi:10.1016/j.apcatb.2019.118348

Cited by 314 publications

(63 citation statements)

References 62 publications

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“…Additionally, a recent study revealed the role of doped N and S for the catalytic activity of modified biochar [ 77 ]. The N-doped biochar gave a positive while S-doping demonstrated a negative effect on biochar-catalyzed PMS activation for metolachlor degradation.…”

Section: Evolution Of 1 O 2 mentioning

confidence: 99%

“…The formation of 1 O 2 was detected for the mineralization of BPA. It was deduced that creation of epoxy structure was a possible course to generate 1 O 2 for ketone-catalyzed PMS decomposition as presented in Equations ( 13)-( 16 Additionally, a recent study revealed the role of doped N and S for the catalytic activity of modified biochar [77]. The N-doped biochar gave a positive while S-doping demonstrated a negative effect on biochar-catalyzed PMS activation for metolachlor degradation.…”

Section: Biocharmentioning

confidence: 99%

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Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Xiao

Faheem

et al. 2021

IJERPH

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Advanced oxidation processes (AOPs) based on peroxydisulfate (PDS) or peroxymonosulfate (PMS) activation have attracted much research attention in the last decade for the degradation of recalcitrant organic contaminants. Sulfate (SO4•−) and hydroxyl (•OH) radicals are most frequently generated from catalytic PDS/PMS decomposition by thermal, base, irradiation, transition metals and carbon materials. In addition, increasingly more recent studies have reported the involvement of singlet oxygen (1O2) during PDS/PMS-based AOPs. Typically, 1O2 can be produced either along with SO4•− and •OH or discovered as the dominant reactive oxygen species (ROSs) for pollutants degradation. This paper reviews recent advances in 1O2 generation during PDS/PMS activation. First, it introduces the basic chemistry of 1O2, its oxidation properties and detection methodologies. Furthermore, it elaborates different activation strategies/techniques, including homogeneous and heterogeneous systems, and discusses the possible reaction mechanisms to give an overview of the principle of 1O2 production by activating PDS/PMS. Moreover, although 1O2 has shown promising features such as high degradation selectivity and anti-interference capability, its production pathways and mechanisms remain controversial in the present literatures. Therefore, this study identifies the research gaps and proposes future perspectives in the aspects of novel catalysts and related mechanisms.

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Section: Evolution Of 1 O 2 mentioning

confidence: 99%

Section: Biocharmentioning

confidence: 99%

Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Xiao

Faheem

et al. 2021

IJERPH

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“…The reactor was then kept at the set temperature for 2 h. After the first hour, the sample was treated with ammonia gas for 1 h. The final char produced was cooled down to 25°C under N 2 gas before storage and utilization. Similar conditions are used by other researchers in the production of nitrogen-doped char [11,55]. Control cellulose char was produced in the same method described above using identical cellulose fibers by Fluka Analytica, Ireland (Avicel® PH-101, Lot #BCBG9043V) however with only carbonization at 850°C.…”

Section: Catalyst Productionmentioning

confidence: 99%

“…The use of active carbons in catalytic wet oxidation of phenol is not new and was well described by Santiago et al [46]. However, nitrogen doping-the act of introducing nitrogen groups in carbonaceous materials-has been shown to result in novel adsorptive and catalytic capabilities [11] not yet applied to CWO of phenol [4,36,51]. Among these are inexpensive and highly active oxidative catalysis thought to benefit from the improved electron donor/acceptor capability of nitrogen functionalities present on the catalyst surface [26].…”

Section: Introductionmentioning

confidence: 99%

“…Among these are inexpensive and highly active oxidative catalysis thought to benefit from the improved electron donor/acceptor capability of nitrogen functionalities present on the catalyst surface [26]. As such, nitrogen-doped chars are of high interest as replacement for their pure carbon counterparts, especially in the case of CWO processes [11,31].…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen-doped char as a catalyst for wet oxidation of phenol-contaminated water

Tews

Garcia²,

Ayiania

et al. 2021

Biomass Conv. Bioref.

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Catalytic wet oxidation (CWO) of aqueous effluents rich in organic compounds is a very promising technology for the treatment of liquid wastes from biomass conversion processes. CWO reactions occur through the formation of free radical species, produced in the presence of an oxidant, which act on organic contaminates in the effluent. Although the reaction is well known, there exists a lack of affordable catalysts to conduct this process at the lower temperatures and pressures in novel bioenergy processes. This study assessed the catalytic effect of nitrogen-doped chars as such an option. Phenol in aqueous solution was used as a model waste effluent. Treatment was conducted at moderate temperatures (190 to 260°C), oxygen partial pressure of 1 MPa, and reaction times of 15, 30, and 45 min in stainless steel and glass-lined tube reactors. High pressure liquid chromatography (HPLC) analyses of the products quantified phenol and by-product concentrations used in the calculation of reaction activation energy. The char catalyst was studied by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) in order to gain insight into its structure and surface composition. The results indicate that nitrogen-doped char catalysts accelerate the oxidation of phenol by decreasing its reaction activation energy from 82.2 kJ/mol (non-catalyzed) to 40.4 kJ/mol (catalyzed). An analysis from first principles using density functional theory (DFT) was conducted to ascertain which N functional group has the most significant impact on free radical formation in the presence of oxygen. Among all the N functional groups studied, the dipyridinic functional groups showed the most promising characteristics to facilitate the formation of hydroxyl free radicals.

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Persulfate‐Based Biochar‐Assisted Advanced Oxidation

Zhao,

Xu,

Tsang

2023

Biochar Applications for Wastewater Treatment

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Nitrogen-doping positively whilst sulfur-doping negatively affect the catalytic activity of biochar for the degradation of organic contaminant

Cited by 314 publications

References 62 publications

Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Nitrogen-doped char as a catalyst for wet oxidation of phenol-contaminated water

Persulfate‐Based Biochar‐Assisted Advanced Oxidation

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