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Mixed plastics waste valorization to high-added value products via thermally induced phase separation and spin-casting

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Green Energy & Environment 2024年第10期 1627-1640页

作者： Junaid Saleem Moghal Zubair Khalid Baig Usman Bin Shahid Rafael Luque gordon mckay Division of Sustainable Development College of Science and EngineeringHamad Bin Khalifa University Center for Advanced Materials Qatar University Department of Chemical and Biological Engineering The Hong Kong University of Science and Technology Universidad ECOTEC

Plastic waste is an underutilized resource that has the potential to be transformed into value-added ***,its chemical diversity leads to cost-intensive sorting techniques,limiting recycling and upcycling ***,we report an open-loop recycling method to produce graded feedstock from mixed polyolefins waste,which makes up 60%of total plastic *** method uses heat flow scanning to quantify the composition of plastic waste and resolves its compatibility through controlled *** resulting feedstock is then used to synthesize blended pellets,porous sorbents,and superhydrophobic coatings via thermally induced phase separation and *** hybrid approach broadens the opportunities for reusing plastic waste,which is a step towards creating a more circular economy and better waste management practices.

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Synergistic Multilayer Adsorption for Low Concentration Dyestuffs by Biomass

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Chinese Journal of Chemical Engineering 2012年第3期20卷 560-566页

作者： Keith Kim Hung Choy gordon mckay Department of Chemical and Biomolecular Engineering the Hong Kong University of Science and TechnologyHong KongChina

Due to the high cost of adsorbents and their thermal regeneration in recent years, much research has fo- cused on the search for cheaper adsorbents for treating wastewater from textile industry. The single component ad-sorption of an acidic dye, Acid Yellow 117, and a basic dye, Methylene Blue, onto several adsoroents-bamooo, waste wood, bamboo char, waste wood char, bamboo activated carbon, wood activated carbon and active carbon F400 were conducted. Based on a Langmuir analysis, the monolayer adsorption capacities were determined. Three of the adsorbents were selected for binary layer adsorption to check the multilayer concept and the potential application for better adsorbent usage. The two cheapest adsorbents, bamboo and wood are compared with the commer-cial activated carbon F400, and all three systems were successful.

关键词： multilayer adsorption biomass dyestuffs

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Ozone and ozone/hydrogen peroxide treatment to remove gemfibrozil and ibuprofen from treated sewage effluent: Factors influencing bromate formation

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Emerging Contaminants 2020年第1期6卷 225-234页

作者： Hajar Farzaneh Kavithaa Loganathan Jayaprakash Saththasivam gordon mckay Division of Sustainable Development Hamad Bin Khalifa University(HBKU)DohaQatar Qatar Environment and Energy Institute(QEERI) Hamad Bin Khalifa University(HBKU)DohaQatar

Reuse of treated sewage effluent is an important option to overcome water *** wastewater treatment methods are inadequate for the removal of several persistent contaminants such as pharmaceuticals and personal care products(PPCPs).In this study the removal of ibuprofen and gemfibrozil by ozonation and ozone/hydrogen peroxide(O3/H2O2)advanced oxidation process(AOP),as well as the formation of bromate were investigated at different temperatures and pH *** removal of gemfibrozil and a maximum of 80%ibuprofen removal were achieved using ozone dosage of 1.5 mg/L with O3:H2O2 ratio of 1:0.25 in the O3/H2O2 *** effect of temperature on the removal efficiency of these two compounds was found to be negligible from 25 to 40ᵒC for both *** effect from 6 to 9 was also found to be negligible for gemfibrozil removal,while ibuprofen had relatively lower removal by ozonation at pH 6 compared to higher pH *** formation was decreased to 0.012 mg/L when the pH was increased to *** the temperature to 40ᵒC also resulted in less bromate formation which was the lowest value obtained in this study at 0.0102 mg/*** of H2O2 did not affect the formation of bromate and in some cases it was found to be slightly higher compared with ozonation treatment.

关键词： Ozonation Advanced oxidation processes Pharmaceuticals Bromate formation

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Biochar from vegetable wastes:agro-environmental characterization

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Biochar 2020年第4期2卷 439-453页

作者： Snigdhendubala Pradhan Ali H.Abdelaal Kamal Mroue Tareq Al‑Ansari Hamish R.Mackey gordon mckay Division of Sustainable Development College of Science and EngineeringHamad Bin Khalifa UniversityDohaQatar Qatar Environment and Energy Research Institute DohaQatar

Considering the global issue of vegetable wastes generation and its impact on the environment and resources,this study evalu-ated the conversion of four largely produced vegetable wastes(cauliflower,cabbage,banana peels and corn cob residues)into *** waste was tested individually and as a combined blend to assess feedstock influences on biochar *** addition,various pyrolysis temperatures ranging from 300℃ to 600℃ and two particle size fractions(less than 75μm,75-125μm)were *** were characterized for various properties that can influence the biochars’effective-ness as a soil *** was found that pyrolysis temperature was the most dominant factor on biochar properties,but that individual feedstocks produced biochars with different *** biochars had characteristics that varied as follows:pH 7.2-11.6,ECE 0.15-1.00 mS cm^(−1),CEC 17-cmolc kg^(−1)andζ-potential−0.24 to−43 *** on optimal values of these parameters from the literature,cauliflower and banana peels were determined to be the best feedstocks,though mixed vegetable waste also produced good *** optimum temperature for pyrolysis was around 400℃,but differed slightly(300-500℃)depending on the distinct ***,smaller particle size of biochar application was always *** yields were in the range of 20-30%at this temperature range,except for corn cobs which were *** study demonstrates that pyrolysis of dried vegetable wastes is a suitable waste valorization approach to produce biochar with good agricultural properties.

关键词： Food waste Kitchen waste Pyrolysis Biochar properties Soil amendment Particle size

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