Hospital in Saudi Arabia

Awais, G M; Awais, N R

doi:10.1097/00001888-197710000-00020

Cited by 1 publication

(1 citation statement)

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“…The stronger the positive charge on the sample's surface, the better it can trap the chromium anions [31]. Regardless, when the pH goes Additionally, researchers have found that the adsorbent takes in a lot of H + ions when it removes Cr (VI), but this absorption decreases as the pH level increases [33]. When there are plenty of H + ions around, Cr (VI) is more likely to be transformed into Cr (III) [21].…”

Section: Adsorptive Propertymentioning

confidence: 99%

Nitric Acid-Treated Blue Coke-Based Activated Carbon’s Structural Characteristics and Its Application in Hexavalent Chromium-Containing Wastewater Treatment

Wang,

Luoyang

et al. 2023

Molecules

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This study primarily focused on the efficient transformation of low-priced blue coke powder into a high-capacity adsorbent and aimed to address the pollution issue of hexavalent chromium (Cr (VI))-laden wastewater and to facilitate the effective utilization of blue coke powder. A two-step method was utilized to fabricate a blue coke-based nitric acid-modified material (LCN), and the impact of nitric acid modification on the material’s structure and its efficacy in treating Cr (VI)-contaminated wastewater was evaluated. Our experimental results illustrated that, under identical conditions, LCN exhibited superior performance for Cr (VI) treatment compared to the method employing only potassium hydroxide (LCK). The specific surface area and pore volume of LCN were 1.39 and 1.36 times greater than those of LCK, respectively. Further chemical composition analysis revealed that the functional group structure on the LCN surface was more conducive to Cr (VI) adsorption. The highest amount of Cr (VI) that LCN could bind was measured at 181.962 mg/g at 318 K. This was mostly due to chemisorption, which is dominated by redox reactions. The Cr (VI) removal process by LCN was identified to be a spontaneous, exothermic, and entropy-increasing process. Several tests on recycling and reuse showed that LCN is a stable and effective chromium-containing wastewater adsorbent, showing that it could be used in many situations.

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Section: Adsorptive Propertymentioning

confidence: 99%