Pyrolysis based biorefineries have great potential to convert wastes such as plastic and biomass waste into energy and other valuable products to achieve maximum economic and environmental benefits. In this study, the catalytic pyrolysis of different types of plastics waste (PS, PE, PP, and PET) as single or mixed in different ratios in the presence of modified natural zeolite (NZ) catalysts in a small pilot scale pyrolysis reactor was carried out. The NZ was modified by thermal activation (TA-NZ) at 550°C and acid activation (AA-NZ) with HNO3 to enhance its catalytic properties. The catalytic pyrolysis of PS produced the highest liquid oil (70 and 60%) than PP (40 and 54%) and PE (40 and 42%) using TA-NZ and AA-NZ catalysts respectively. The gas chromatography-mass spectrometry (GC-MS) analysis of oil showed a mixture of aromatics, aliphatic and other hydrocarbon compounds. The TA-NZ and AA-NZ catalysts showed a different effect on the wt.% of catalytic pyrolysis products and liquid oil chemical composition, with AA-NZ showing higher catalytic activity than TA-NZ. FT-IR results showed clear peaks of aromatic compounds in all liquid oil samples with some peaks of alkanes that further confirmed the GC-MS results. The liquid oil has higher heating values (HHV) range of 41.7-44.2 MJ/kg, close to conventional diesel. Therefore, it has the potential to be used as an alternative source of energy and as transportation fuel after refining/ blending with conventional fuels.

/pdf/catalytic-pyrolysis-of-plastic-waste-moving-toward-pyrolysis-4txbzvk6h6.pdf

Catalytic pyrolysis of plastic waste: Moving toward pyrolysis based biorefineries

Adsorption of organic dyes from wastewater by metal-doped porous carbon materials

https://pureadmin.qub.ac.uk/ws/files/190290035/water_treatment_revised_Review_Accepted_for_publication.pdf

Insight on water remediation application using magnetic nanomaterials and biosorbents

Hierarchical porous Ni/Co-LDH hollow dodecahedron with excellent adsorption property for Congo red and Cr(VI) ions

Calcium-rich biochar from crab shell: An unexpected super adsorbent for dye removal

A low-cost novel carbon-metal double layered oxides (C/MnCuAl-LDOs) nano-adsorbent was synthesized by co-precipitation, for the adsorption of Congo red (CR), using modified carbon derived from pyrolysis of polystyrene (PS) plastic waste. The synthesized C/MnCuAl-LDOs has a crystalline structure with a high surface area of 60.43 m2/g and pore size of 99.85 A. Adsorption of CR using all prepared adsorbents from aqueous solution under equilibrium and kinetic conditions were evaluated against different values of the pH (4–10), initial CR concentrations (25–250 mg/g), contact time (0–310 min) and temperature (30–50 °C). The obtained results revealed that C/MnCuAl-LDOs showed maximum adsorption capacity for CR among all the used adsorbents. The optimum equilibrium time was 180 min, whereas acidic medium (pH 4.5) favored the maximum adsorption of CR up to 317.2 mg/g on C/MnCuAl-LDOs. The adsorption kinetics followed the pseudo-second-order model, whereas Freundlich adsorption isotherm fitted best to obtained data in comparison to Langmuir adsorption isotherm. The results suggested that C/MnCuAl-LDOs is an efficient material for the removal of organic pollutants from the wastewater.

Untapped conversion of plastic waste char into carbon-metal LDOs for the adsorption of Congo red.

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Untapped conversion of plastic waste char into carbon-metal LDOs for the adsorption of Congo red.