Rice husk ash sorbent doped with copper for simultaneous removal of SO2 and NO: Optimization study

Review on the physicochemical treatments of rice husk for production of advanced materials

“…Acid washing lowered the ash pH and enhanced lutein adsorption by the ash. In the case of gas adsorption it was reported that absorbent prepared from rice husk ash such asRHA/CaO/CeO 2 , RHA/CaO, RHA doped with copper and RHAlithium based have a high capacity in sulfur dioxide (SO 2 ), NO and CO 2 absorption [32][33][34][35][36].In additionwith the aim of lowering manufacturing cost and green synthesis for CO 2 absorbant, a series of polyethyleneim-immobilized uni model and/or biolodal porous silicas were prepared from rice husk ash with biopolymer of chitosan as a pore structure-directing agent [37]. Zeng and Bai reported that TEPA-impregnated mesoporous silica from rice husk treated at 400ºC exihibits agood CO 2 adsorptioen capacity of 173 mg/g adsorbent under 10%CO 2 at 75ºC.…”

High temperature capture of CO2 on lithium-based sorbents from rice husk ash

“…Green technology or the use of environment-friendly chemical processes is gaining attractiveness [23][24][25] because of the demand from conscientious consumers and strict environmental regulations. Hence, the use of rice husk ash (RHA), an undesirable agricultural mass residue, or fly ash (FA) from coal combustion in power plants as sources of silica for lithium silicate preparation could be an efficient eco-friendly route.…”

“…In a very recent study [26], Olivares-Marín et al synthesized Li 4 SiO 4 -based sorbents from FA that could maintain high CO 2 sorption capacities in 10 cycle processes. Compared with FA, RHA has higher amorphous SiO 2 content [23,27]. Moreover, RHA also contains some amounts of metals [28][29][30], which may generate high-performance Li 4 SiO 4 -based sorbents for CO 2 Taking into account the significant amorphous SiO 2 and metals content in RHA, Li 4 SiO 4 -based sorbents from RHA for CO 2 capture were developed in this study.…”

Influence of Carbonisation Temperature on the Surface Pore Characteristics of Acid-Treated Oil Palm Empty Fruit Bunch Activated Carbon

“…Chemical activation requires lower energy and operating cost while producing higher carbon yields, high surface areas, and a well-developed porous structure. On the other hand, the surface chemistry on the carbon precursor can be modified with various activating agents such as NaOH [10,11], KOH [12], H3PO4 [13][14][15], and HNO3 [16,17] to enhance surface oxygen complexes [18] which normally aid in the adsorption process.…”