The Findings of the Agency for Toxic Substances and Disease Registry Medical Waste Tracking Act Report

Lichtveld, Maureen Y.; Rodenbeck, Sven E.; Lybarger, Jeffrey A.

doi:10.2307/3431278

Cited by 1 publication

(2 citation statements)

References 8 publications

(8 reference statements)

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“…48 Herein, the numerical optimization found a point that maximizes the desirability function in 4-NP degradation. For example, the criteria set for the 3 factors in the range including contact time (10-90 minutes), pH of the solution (3)(4)(5)(6)(7)(8), and initial 4-NP concentration (10-30 mg/L) and 96.08% maximum degradation of 4-NP were found to be the maximum desirability. Figure 6 shows ramp desirability that was generated from 100 optimum points via numerical optimization.…”

Section: Optimization Of 4-np Degradation Using Rsm-bbdmentioning

confidence: 99%

“…4,5 The Agency for Toxic Substances and Disease Registry (ATSDR) of the United States designated 4-NP as one of the 114 organic compounds listed, which poses a great danger to living organisms in the environment. 6 Hence, 4-NP needs to be removed from wastewater before being discharged into the environment. There are various physical, chemical, and biological treatments such as photocatalytic degradation, 7 flocculation, 8 ion exchange, 9 membrane filtration, 10 adsorption, 11 and Fenton-like degradation 12 that have been investigated to remove these contaminants from wastewater.…”

Section: Introductionmentioning

confidence: 99%

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RSM-BBD Optimization of Fenton-Like Degradation of 4-Nitrophenol Using Magnetite Impregnated Kaolin

Belachew

Fekadu

Abebe

2020

Air, Soil and Water Research

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In this work, we have reported a low-cost and environmentally friendly Fe3O4-modified activated kaolin (AK-Fe3O4) composite for efficient Fenton-like degradation of 4-nitrophenol (4-NP) and optimization of the degradation variables. The AK-Fe3O4 composites were characterized by Fourier transform infrared spectroscopy, powder x-ray diffraction, scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). X-ray diffraction confirms the syntheses of pure phases of Fe3O4 and AK-Fe3O4. The SEM image of the AK-Fe3O4 composite reveals the formation of a highly porous surface. The room temperature VSM analysis describes the superparamagnetic nature of AK-Fe3O4 composites with 25 emu/g magnetization values. Response surface methodology coupled with Box-Behnken design was used to optimize the 4-NP degradation (%) variables such as contact time (10-90 minutes), 4-NP concentration (10-30 mg/L), and pH (3-8). The high regression value ( R² = 0.9964 and adjusted R² = 0.9917) and analysis of variance ( P < .0001) show that the quadratic model can sufficiently explain the 4-NP degradation (%). The optimum 4-NP degradation was found to be 96.01% ± 1.89% using 1 mg/mL of AK-Fe3O4, 20 mg/L of 4-NP, 97.9 mmol/L of H2O2, and pH of 3 at the end of 75 minutes of reaction time. Moreover, the catalyst shows good recyclability and stability after 5 successive degradations of 4-NP. In general, a low-cost and magnetically separable AK-Fe3O4 composite is an effective Fenton-like catalyst for the degradation of 4-NP.

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