Effects of chemical modification on physicochemical properties and adsorption behavior of sludge-based activated carbon

Wu, Chunxu; Li, Lanfeng; Zhou, Hao; Ai, Jing; Zhang, Hongtao; Tao, Jialin; Wang, Dongsheng; Zhang, Weijun

doi:10.1016/j.jes.2020.08.005

Cited by 32 publications

(21 citation statements)

References 43 publications

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“…South Africa produces 673360 metric tons of sewage sludge annually, of which only about 19% is recycled and the rest is landfilled, necessitating the development of innovative approaches to reduce sewage sludge emissions 2 . Landfilling as a wastewater treatment residue management alternative poses significant environmental concerns about bacteria, heavy metals, and trace organic pollutants; the same conclusion applies to traditional sea dumping and forestry, both of which are deemed unsustainable 4 .…”

Section: Introductionmentioning

confidence: 94%

Synthesis and performance evaluation of adsorbents derived from sewage sludge blended with waste coal for nitrate and methyl red removal

Masengo

Mulopo

2022

Sci Rep

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Low-cost adsorbents were synthesized using two types of sewage sludge: D, which was obtained during the dissolved air flotation stage, and S, which was a mixture of primary and secondary sludge from the digestion and dewatering stages. The sewage sludge was mixed with waste coal before being activated with potassium hydroxide (KOH) and oxidized with ammonium persulfate (APS). The nitrate and methyl red removal capacities of the synthesized adsorbents were evaluated and compared to those of industrial activated charcoal. The oxidation surface area of adsorbents derived from sludge S shrank by six fold after modification i.e., from 281.72 (unoxidized) to 46.573 m2/g for the oxidized adsorbent with a solution of 2M ammonium peroxydisulfate, while those derived from D only varied narrowly from 312.72 to 282.22 m2/g, but surface modification had no effect on inorganic composition in either case. The adsorption of nitrate and methyl red (MR) was performed in batch mode, and the removal processes followed the pseudo second order kinetic model and the Langmuir isotherm fairly well. The adsorption capacities of nitrate and MR were higher at pH = 2 and pH = 4, respectively.

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Section: Introductionmentioning

confidence: 94%

Synthesis and performance evaluation of adsorbents derived from sewage sludge blended with waste coal for nitrate and methyl red removal

Masengo

Mulopo

2022

Sci Rep

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“…12,13 Normally, biochar directly prepared from conventional agriculture and forestry wastes has limited adsorption capacity for certain heavy metals, which is due to insufficiently active functional groups and low selectivity. 14 For instance, the pristine biochar has a limited adsorption capacity for the removal of arsenic and cadmium. 15 Studies have been conducted to enhance biochar adsorption capacity through surface modication.…”

Section: Introductionmentioning

confidence: 99%

Screening the functions of modified rice straw biochar for adsorbing manganese from drinking water

Zhao

Pan

et al. 2022

RSC Adv.

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“…Chemical modification, in turn, is divided into liquid and gas modification [25]. The most widely studied compounds used for liquid modification are nitric acid [26], sulfuric acid [27,28] phosphoric acid [28,29], hydrochloric acid [30], and hydrogen peroxide [31].…”

Section: Introductionmentioning

confidence: 99%

“…Wu et al [30] used HCl, HNO 3 , and NaOH as compounds to modify the surface of activated carbon. It was noticed that the number of C-O functional groups increased for the carbons subjected to acid modification, while their number decreased after alkaline modification.…”

Section: Introductionmentioning

confidence: 99%

Activated Carbon Modification towards Efficient Catalyst for High Value-Added Products Synthesis from Alpha-Pinene

et al. 2021

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DT0-activated carbons modified with HCl and HNO3 acids, which were used for the first time in the catalytic process of alpha-pinene isomerization, are presented in this study. The carbon materials DT0, DT0_HCl, DT0_HNO3, and DT0_HCl_HNO3 were examined with the following methods: XRF, SEM, EDX, XPS, FT-IR, XRD, and N2 adsorption at −196 °C. It was shown that DT0_HCl_HNO3-activated carbon was the most active material in the alpha-pinene isomerization process. Detailed studies of alpha-pinene isomerization were carried out over this carbon by changing the reaction parameters such as time (5–180 min) and temperature (60–175 °C). The 100% conversion of alpha-pinene was achieved at the temperature of 160 °C and catalyst content of 5 wt% after 3 h over the DT0_HCl_HNO3 catalyst. Camphene and limonene were the main products of the alpha-pinene isomerization reaction.

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Effects of chemical modification on physicochemical properties and adsorption behavior of sludge-based activated carbon

Cited by 32 publications

References 43 publications

Synthesis and performance evaluation of adsorbents derived from sewage sludge blended with waste coal for nitrate and methyl red removal

Synthesis and performance evaluation of adsorbents derived from sewage sludge blended with waste coal for nitrate and methyl red removal

Screening the functions of modified rice straw biochar for adsorbing manganese from drinking water

Activated Carbon Modification towards Efficient Catalyst for High Value-Added Products Synthesis from Alpha-Pinene

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