Factors affecting the adsorption of gaseous environmental odors by activated carbon: A critical review

A critical review on VOCs adsorption by different porous materials: Species, mechanisms and modification methods

“…Modification technologies are employed to adjust specific surface areas, chemical functional groups and pore structure of VOCs adsorbent, in order to improve their adsorption performance. The previous reviews are mainly focused on carbonaceous materials and their modifications, while VOCs adsorption performance of some other absorbents is inadequately reported in the literature (Gonzá lez-Garcí a 2018; Le-Minh et al;2018, Le Cloirec 2012Zhang et al, 2017). In this work, VOCs absorption performance of different porous materials would be comprehensively reviewed, including activated carbon, biochar, activated carbon fiber, graphene, carbon nanotube, zeolite, metal organic framework, clays, silica gel, organic polymer and composites.…”

“…Physical adsorption can be ascribed to the intermolecular gravitation, namely Van der Waals force or dispersion force. Because of the weak interaction, no chemical bonds involved and low adsorption heat, the solid adsorbents can be regenerated easily and keep their original structure unchanged (Le-Minh et al, 2018). Yang et al (2018) considered that the physical adsorption process could be divided into three stages.…”

“…Chemical adsorption refers to the chemical reaction between surface functional groups of adsorbent and adsorbate molecules. The difference between physical adsorption and chemical adsorption are summarized as follows: i) Chemical adsorption usually involves one single surface layer, while physical adsorption involves multilayers especially in the high pressure (Le-Minh et al, 2018;Schnelle et al, 2001); ii) Chemical adsorption presents more selectivity than physical adsorption because the chemical reaction only occurs between special groups and certain VOCs;…”

Identifikasi Komponen Volatile Kulit Ari Biji Kopi (Coffea robusta) Guna Optimalisasi Kebermanfaatan

“…Mekanisme yang dimiliki dari atom karbon dalam mengeliminasi bau tidak sedap didasarkan pada adsorpsi fisik dari fase gas ke fase padat yaitu kulit ari kopi robusta (C. robusta). Mekanisme adsorpsi fisik secara efektif terjadi pada kisaran suhu rendah (5 hingga 30°C), dibandingkan dengan proses adsorpsi kimia yang efektif terjadi pada kisaran suhu tinggi (45 hingga 80°C) [20]. Senyawa karbon memiliki kapasitas adsorpsi yang sangat baik (>20% berat absorbat per berat kulit ari kopi).…”

“…Senyawa polutan dalam fase gas akan berdifusi melalui struktur berpori yang terbentuk dari konformasi atom karbon ke pori-pori yang lebih kecil yang diatur oleh energi potensial dari gaya tarik Van der Waals antara permukaan molekul absorben dan absorbat [20]. Tingkat difusi akan bergantung pada ukuran molekul dan struktur pori-pori yang terbentuk dari konformasi atom karbon pada kulit ari biji kopi robusta (C. robusta).…”