Article
Materials Science, Multidisciplinary
Yajun Chen, Mengqi Li, Fenghao Hao, Chunzhuang Yang
Summary: A phosphorus-containing organosilicon compound was synthesized to modify organic-montmorillonite, improving the flame retardancy of rigid polyurethane foam composites. Thermal stability and flame retardancy were studied using various tests, showing enhanced performance after modification.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yajun Chen, Mengqi Li, Fenghao Hao, Chunzhuang Yang
Summary: By synthesizing a phosphorus-containing organosilicon compound (PCOC) to modify organic-montmorillonite (M-OMMT) and combining it with ammonium polyphosphate (APP), the flame retardancy of rigid polyurethane foam (RPUF) composites was improved, reducing peak heat release rate and total smoke release while increasing residual char yield.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Menghe Zhu, Zhewen Ma, Lei Liu, Jianzhong Zhang, Siqi Huo, Pingan Song
Summary: This comprehensive review focuses on the design, application, and effects of reactive, additive, and coating halogen-free flame retardants in rigid polyurethane foam (RPUF). The challenges and future research opportunities are also discussed.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Polymer Science
Xue Qian, Qiang Liu, Laibao Zhang, Hui Li, Jiwen Liu, Shouke Yan
Summary: In this study, a reactive flame-retardant diol called BEOPMS was synthesized and combined with PMDI for the fabrication of PIR foams. The results showed that BEOPMS effectively improved the flame retardancy of the foams, and higher LOI and char residue yield values were achieved at specific NCO/OH ratios and phosphorus contents.
POLYMER DEGRADATION AND STABILITY
(2022)
Review
Chemistry, Physical
Yuping Jiang, Hongyu Yang, Xiang Lin, Simeng Xiang, Xiaming Feng, Chaojun Wan
Summary: Rigid polyurethane foam (RPUF) is a highly effective thermal insulation material, but its flammability poses a fire hazard. The large specific surface area of RPUF makes it prone to ignition and rapid fire spread when exposed to heat sources. A flame-retardant coating on the surface of RPUF can effectively reduce or prevent flame propagation, improving fire safety. This paper reviews the preparations, properties, and working mechanisms of flame-retardant coatings on RPUF, and identifies high-performance, biological, biomimetic, and multifunctional flame-retardant coatings as the future development trends for surface flame-retardant systems.
Article
Thermodynamics
Esra Caliskan, Tuba Cakir Canak, Mufide Karahasanoglu, I. Ersin Serhatli
Summary: The novel compound BHAPPO showed effective flame retardant properties for polyurethane foam, with a confirmed synergistic effect when combined with ammonium polyphosphate (APP). The combination of BHAPPO and APP was found to have a dependency in reducing flammability and enhancing char formation of the foam.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Engineering, Chemical
Jiazi Wu, Xin Zhang, Zhaolu Qin, Wenchao Zhang, Rongjie Yang
Summary: Flame-retardant rigid polyurethane foam (RPUF) composites were fabricated using different flame retardants (APP, PEPA, PCP, and ADP), labeled as RPUF-1, RPUF-2, and RPUF-3. The effects of flame retardants on the apparent density and compressive strength of RPUF were studied. Results showed that flame retardants improved both the apparent density and compressive strength of RPUF composites. The inorganic/organic phosphorus-based flame retardants significantly improved the limiting oxygen index (LOI), especially in RPUF-2 and RPUF-3 systems. Cone calorimeter tests revealed a decrease in heat release for RPUF-1, RPUF-2, and RPUF-3 systems compared to pure RPUF, with APP and ADP system performing the best in reducing heat release, and APP and PEPA systems performing the best in decreasing smoke release. The flame retardancy mechanism of RPUF composites was analyzed in detail.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Polymer Science
Yang Zhi, Xi Wang, Lijun Qian, Qiu Yong, Jingyu Wang, Yajun Chen, Tang Wei
Summary: Phosphaphenanthrene derivate molecule (DT) was synthesized and its flame retardant effect in polyurethane foam rigid polyurethane foams (RPUFs) was explored by combining micro-expanded graphite (MEG) and dimethyl methylphosphonate (DMMP) in different ways. The results showed that the intercalated DT-MEG system had better properties compared to the DT blended MEG system. The DT-MEG/DMMP compound flame retardant system exhibited excellent synergistic flame retardant effects in both the gas and condensed phases, by adsorption charring flame retardant effects and reducing combustion intensity.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Polymer Science
Wei Zhang, Mingyu Tong, Fengqin Xing, Hui Zheng, Chaonan Zhu
Summary: This paper investigates an environmentally friendly fireproof rigid polyurethane foam material. A flame-retardant coating is applied to improve the material's flame retardancy and smoke suppression.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Applied
Isao Tsuyumoto
Summary: New flame-retardant coatings for rigid polyurethane foam have been developed using mixtures of amorphous sodium polyborate and various polysaccharides, achieving high flame retardancy and improved water resistance. The mechanism involves the creation of a carbonaceous foam layer from polysaccharides by the action of SPB foam layer, providing protection from heat and oxygen.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Yuqiang Wu, Jingshui Xu, Jianlei Zhang, Yashui Xie, Guoliang Zhang
Summary: In this study, innovative aromatic phosphorus-containing flame-retardant polyols (DOPO-MA-EG) were successfully synthesized and applied to generate inherently flame-retardant PUFs. Results showed that DOPO-MA-EG significantly improved the flame retardancy of FR-PUFs while reducing the heat release rate and smoke production. This work demonstrates the potential application of synthetic DOPO-MA-EG as reactive flame-retardant polyols for PUFs.
Article
Engineering, Environmental
Gurjot S. Dhaliwal, Dilpreet S. Bajwa, Sreekala Bajwa
Summary: By adding nanoclay to soy-based PU foam, the foam exhibited superior mechanical and flame retardant properties.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Zhitong Yang, Zhicheng Sun, Yibin Liu, Gongming Li, Zhenzhen Li, Chenyang Liu, Ting Wang, Yang Zhou
Summary: The flame retardant microcapsules with excellent particle size distribution were successfully synthesized and introduced into the polyurethane foam as a flame retardant, significantly improving the flame retardancy and fire safety of the material.
Article
Polymer Science
Bilal Aydogan, Nazim Usta
Summary: This study investigated the effects of dolomite and intumescent flame retardant on the thermal and combustion behaviors of rigid polyurethane foams. It was found that the addition of 5% dolomite and 10% intumescent flame retardant could improve the thermal stability and fire resistance of the foams.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Seung Hun Lee, Seul Gi Lee, Jun Seo Lee, Byung Chol Ma
Summary: Combinations of multiple inorganic fillers can enhance the flame retardancy of rigid polyurethane foam, improving thermal stability and fire resistance.
Article
Chemistry, Physical
Hichem Zeghioud, Aymen Amine Assadi, Nabila Khellaf, Hayet Djelal, Abdeltif Amrane, Sami Rtimi
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2018)
Article
Chemistry, Physical
Hichem Zeghioud, Aymen Amine Assadi, Nabila Khellaf, Hayet Djelal, Abdeltif Amrane, Sami Rtimi
Article
Engineering, Chemical
Hichem Zeghioud, Mahamadou Kamagate, Lassina Sandotin Coulibaly, Sami Rtimi, Aymen Amine Assadi
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2019)
Article
Engineering, Chemical
Ikram Rouibah, Hichem Zeghioud, Nabila Khellaf, Amine Assadi Aymen, Hedi Benmansour, Hayet Djelal, Abdeltif Amrane
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2020)
Article
Environmental Sciences
Hichem Zeghioud, Nabila Khellaf, Abdeltif Amrane, Hayat Djelal, Mohamed Bouhelassa, Aymen Amine Assadi, Sami Rtimi
Summary: The study demonstrates that combining photocatalytic pretreatment with conventional biological treatment can improve efficiency. After 7 days of biological treatment, the discoloration rates for the pretreated solutions under photocatalysis for 4 and 8 hours were 34.5% and 19% respectively, while the combined processes achieved better results with a COD removal rate of 74.9%.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Review
Engineering, Environmental
Hichem Zeghioud, Phuong Nguyen-Tri, Lotfi Khezami, Abdeltif Amrane, Aymen Amine Assadi
JOURNAL OF WATER PROCESS ENGINEERING
(2020)
Review
Environmental Sciences
Imen Assadi, Ahlem Guesmi, Oussama Baaloudj, Hichem Zeghioud, Walid Elfalleh, Naoufel Benhammadi, Lotfi Khezami, Aymen Amine Assadi
Summary: Despite the wide investigation of non-thermal plasma technologies for air treatment, research on the inactivation mechanism of viruses by NTPs is limited. Non-thermal plasma is considered a promising virus-inactivation technology due to its efficiency and environmental compatibility. This review explores the application of NTPs for virus inactivation in indoor air, focusing on mechanisms and experimental results.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
Hicham Zeghioud, Lydia Fryda, Angelique Mahieu, Rian Visser, Abdoulaye Kane
Summary: The suitability of flax shives and beech wood residues as feedstocks for producing low environmental-impact adsorbent biochar was evaluated. The adsorption capacity of the produced biochars, particularly beech wood biochar, was tested. Post treatment with citric acid (CA) and oxidation enhanced the adsorption capacities of both flax shives biochar (FSBC) and beech biochar (BBC). The results showed that beech biochar is a promising pollutant adsorbent with mild activation treatment.
Review
Engineering, Environmental
Hicham Zeghioud, Lydia Fryda, Hayet Djelal, Aymen Assadi, Abdoulaye Kane
Summary: This review provides an overview of the recent research progress on the use of biochar in removing toxic organic pollutants from wastewater. It analyzes the characteristics and influencing factors of different treatment techniques and discusses the toxicity of biochar components and its application process in water treatment. Finally, this review suggests future research directions.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Chemistry, Physical
Sadou Dalhatou, Mouhamadou Sali, Samuel Tetteh, Abdoulaye Boubakari, Bouba Talami, Hicham Zeghioud, Abdoulaye Kane, Atef El Jery, Aymen Amin Assadi, David Olubiyi Obada
Summary: This study evaluated the sorbent and photocatalytic potential of local clay in the degradation of crystal violet dye in irrigated rice field waters. The clay exhibited strong adsorption capacity and showed improved photocatalytic activity when coupled with titanium dioxide (TiO2).
Article
Chemistry, Physical
Abdoulaye Kane, Latifa Chafiq, Sadou Dalhatou, Pierre Bonnet, Maryline Nasr, Nathalie Gaillard, Jean Marie Dangwang Dikdim, Guillaume Monier, Aymen Amine Assadi, Hicham Zeghioud
Summary: The UVA light-driven g-C3N4/TiO2 photocatalyst was synthesized for the degradation of CBZ in aqueous solution. Optical absorption studies revealed band gaps of 2.97 eV and 2.78 eV for 10%g-C3N4/TiO2 (A10) and 30%g-C3N4/TiO2 (A30), respectively. Photodegradation studies showed that the A10 composite catalyst could eliminate 71.41% of CBZ within 360 minutes of UVA irradiation.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Environmental Sciences
Fadimatou Hassan, Pierre Bonnet, Jean Marie Dangwang Dikdim, Nadege Gatcha Bandjoun, Christophe Caperaa, Sadou Dalhatou, Abdoulaye Kane, Hicham Zeghioud
Summary: Graphitic carbon nitride based photocatalyst (g-C3N4) was synthesized and investigated for its photocatalytic performance in the removal of Eriochrome Black T (EBT) and Bromophenol Blue (BPB) under UV irradiation. The addition of persulfate (PS) improved the degradation efficiency, and the optimal conditions were determined through response surface methodology (RSM). The study identified the contribution of different radicals in the photocatalytic process and demonstrated the potential of TiO2/g-C3N4 composite as a promising catalyst.
Article
Environmental Sciences
Hicham Zeghioud, Sali Mouhamadou
Summary: The pyrolysis of wastewater sewage sludge at different temperatures was used to prepare biochar. The biochar prepared at 750 degrees C showed high adsorption capacity for methylene blue (MB) and was magnetized by co-precipitation techniques. The magnetic biochar presented changes in surface properties and exhibited enhanced adsorption capacity for MB.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Environmental Sciences
Kheira Benazouz, Nasma Bouchelkia, Ali Imessaoudene, Jean-Claude Bollinger, Abdeltif Amrane, Aymen Amine Assadi, Hicham Zeghioud, Lotfi Mouni
Summary: Chitosan was successfully synthesized from gray shrimp carapaces and used for adsorbing Orange G dye. Optimum conditions for maximum dye uptake were determined through optimization and modeling processes.
Article
Engineering, Chemical
Thomas Chadelaud, Hicham Zeghioud, Alonso Reynoso de la Garza, Omar Fuerte, Adriana Benitez-Rico, Messika Revel, Tomas E. Chavez-Miyauchi, Hayet Djelal
Summary: In this study, a comparative analysis was conducted to determine the efficiency of biodegradation and photocatalysis in degrading Rhodamine B. The research also evaluated the ecotoxicity of the by-products generated from these processes. The results showed that photocatalysis achieved better color removal and COD reduction, resulting in by-products with higher biodegradability.