A facile fabrication of ratiometric electrochemical sensor for sensitive detection of riboflavin based on hierarchical porous biochar derived from KOH-activated Soulangeana sepals

Abstract

Herein, a facile ratiometric electrochemical method was developed for sensitive sensing of riboflavin (RF) based on hierarchical porous biochar (HPB) modified electrode. In this sensing system, the reference paracetamol (PA) was directly added into electrolyte solution without the requirement of complex immobilization process. HPB derived from KOH-activated Soulangeana sepals displays hierarchical porous structure, high specific surface area and rich oxygen-containing functional groups, which is favorable for RF adsorption and enrichment. Besides, the excellent electronic conductivity and superior electrocatalytic activity of HPB can effectively promote the electrooxidation of RF. Moreover, the dual-signal strategy greatly improves the reproducibility and reliability of electrochemical detection. Based on the proposed ratiometric sensing platform, the sensor exhibits a wider linear range of 0.0007-10 μM and a lower limit of detection of 0.2 nM. The method also presents good selectivity and has been applied to the determination of RF in milk samples with satisfactory results.

Nitrogen Doped Porous Biochar/β-CD-MOFs Heterostructures: Bi-Functional Material for Highly Sensitive Electrochemical Detection and Removal of Acetaminophen

“…Although the biomass will be self-activated when carbonized at high temperatures, the pore structure obtained by such self-activation is uncontrollable. In contrast, the use of various activators, such as KOH [ 20 ], KCl [ 21 ], ZnCl 2 [ 22 ], and K 2 CO 3 [ 23 ], could realize the orderly adjustment of porous structure in the preparation of biochar.…”

Waste Plastic Polypropylene Activated Jujube Charcoal for Preparing High-Performance Phase Change Energy Storage Materials

“…The results showed that the new biochar had a higher specific surface area and micropore structure, which were 689.9 m 2 /g and 6.0 Å, respectively. He and his coworkers [ 7 ] studied KOH activated porous carbon and found that the hierarchical porous biochar extracted from the KOH activated Soulangeana sepals had a hierarchical porous structure, high specific surface area, and abundant oxygen-containing functional groups. Jie et al [ 8 ] showed that the thermal decomposition of plastic, as a common waste, and a representive hydrogen-rich energy raw material with high hydrogen content (8%~14%) could produce hydrogen-rich gas.…”

Facile One-Step Pyrolysis of ZnO/Biochar Nanocomposite for Highly Efficient Removal of Methylene Blue Dye from Aqueous Solution

“…Inorganic and organic pollution factors, such as heavy metals, toxic dyes, pesticides, etc., are harmful to the human health as well as ecological systems. , Therefore, many technologies and materials have been developed to solve water pollution issues. Biochar is a traditional adsorbent for treatment of many pollutants due to its high carbon content, nontoxicity, low cost, and environment friendliness and thus has a high wastewater treatment potential. − For instance, cattle manure-derived biochar was employed as an adsorbent for the removal of methylene blue (MB) from aqueous solutions . Coconut husk-derived biochar was also applied for the remediation of ciprofloxacin and tetracycline in wastewater …”

“…Biochar is a traditional adsorbent for treatment of many pollutants due to its high carbon content, nontoxicity, low cost, 3 and environment friendliness and thus has a high wastewater treatment potential. 4 − 6 For instance, cattle manure-derived biochar was employed as an adsorbent for the removal of methylene blue (MB) from aqueous solutions. 7 Coconut husk-derived biochar was also applied for the remediation of ciprofloxacin and tetracycline in wastewater.…”