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Article: Editorial: Green chemistry to recycle Fe/C-rich wastes for environmental pollution control.

Suiyi, Zhu / Wei, Fan / Xinfeng, Xie / Temuujin, Jadambaa

2023 Volume 11, Page(s) 1178615

Language	English
Publishing date	2023-04-13
Publishing country	Switzerland
Document type	Editorial
ZDB-ID	2711776-5
ISSN	2296-2646
ISSN	2296-2646
DOI	10.3389/fchem.2023.1178615
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Comparison of disinfection by-products formed by preoxidation of sulfamethazine by K2FeO4 and O3 and the influence on cytotoxicity and biological toxicity

Siwen Li / Yingzi Lin / Gaoqi Wang / Suiyi Zhu / Gen Liu / Chunyan Shi / Lei Chen

Frontiers in Chemistry, Vol

2022 Volume 10

Abstract: This study researched the formation of disinfection by-products (DBPs) in sulfamethazine (SMZ) chlorination after preoxidation by K2FeO4 and O3 and the influence of preoxidation on cytotoxicity and biological toxicity. Then, the study emphatically ... ...

Abstract	This study researched the formation of disinfection by-products (DBPs) in sulfamethazine (SMZ) chlorination after preoxidation by K2FeO4 and O3 and the influence of preoxidation on cytotoxicity and biological toxicity. Then, the study emphatically analyzed the influencing factors such as NaClO dosage, pH value, reaction temperature, fulvic acid (FA), and bromide and iodide ions. The results showed that preoxidation by K2FeO4 effectively inhibited the formation of DBPs of haloketones (HKS) and trihalomethanes (THMs), with an average inhibition rate of over 60%. The formation of DBPs after preoxidation by O3 was higher than that by K2FeO4; preoxidation by K2FeO4 reduced the influence of NaClO dosage, temperature, and pH value on the production of DBPs after SMZ chlorination. The cytotoxicity and biological toxicity of SMZ chlorination after preoxidation were evaluated and compared by calculating the LC50 value of DBPs and the luminescent bacteria method. The results of both calculation methods showed that the toxicity of DBPs after preoxidation by K2FeO4 was lower than that by O3 preoxidation. K2FeO4 and O3 preoxidation improved the SMZ removal efficiency by 8.41 and 10.49%, respectively, and inhibited the formation of most DBPs, but the preoxidation promoted the formation of highly toxic DBPs (HANs). The toxicity of DBPs formed in SMZ chlorination after preoxidation by K2FeO4 and O3 was slightly higher than that of chlorination disinfection alone, but it was still within the safe range. This study provides more new details about the formation and toxicity changes of DBPs in the process of SMZ chlorination after preoxidation.
Keywords	preoxidation by potassium ferrate ; preoxidation by ozone ; chlorine disinfection ; DBP ; toxicity ; Chemistry ; QD1-999
Subject code	660
Language	English
Publishing date	2022-08-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Perspective on pH adjustment in hydrometallurgical recycling of valuable metals from waste.

Suiyi, Zhu / Jian, Wang / Yuhong, Huang / Ying, Wang / Yuxin, Zhang / Jiabao, Qin / Jiancong, Liu / Jinlu, Yao / Meichun, Ji

Frontiers in chemistry

2023 Volume 11, Page(s) 1177173

Abstract: pH adjustment was considered a simple step in the hydrometallurgy process, but its complicated operation was ignored in the past. In some industrial applications, the leachate pH was slowly adjusted by a diluted alkaline solution, with the defects of ... ...

Abstract	pH adjustment was considered a simple step in the hydrometallurgy process, but its complicated operation was ignored in the past. In some industrial applications, the leachate pH was slowly adjusted by a diluted alkaline solution, with the defects of doubling the leachate volume and causing droplet hydrolysis/coagulation. Up to date, promising routes have been developed for rapid pH adjustment, especially in sealed high-temperature/pressure vessels. New routes emerged in some redox/decomposition reactions of nitrate/urea and organics. Such reactions did not start and/or were slow at room temperature but started spontaneously at high temperatures to generate/consume free H
Language	English
Publishing date	2023-05-18
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2711776-5
ISSN	2296-2646
ISSN	2296-2646
DOI	10.3389/fchem.2023.1177173
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Conversion of Fe-rich sludge to KFeS2 cluster

Yu Chen / Zhihua Wang / Dongxu Liang / Yanwen Liu / Hongbin Yu / Suiyi Zhu / Leilei Zhang

Arabian Journal of Chemistry, Vol 14, Iss 6, Pp 103173- (2021)

Spontaneous hydrolysis of KFeS2 for the effective adsorption of doxycycline

2021

Abstract: Fe-rich sludge is a solid waste considerably generated in coagulation, Fenton, and catalytic processes for wastewater treatment, in which it is commonly disposed in landfills. However, a limited portion of sludge is recycled as polymeric ferric ... ...

Abstract	Fe-rich sludge is a solid waste considerably generated in coagulation, Fenton, and catalytic processes for wastewater treatment, in which it is commonly disposed in landfills. However, a limited portion of sludge is recycled as polymeric ferric flocculant and iron red. Herein, the Fe-rich sludge was simulated by the hydrolysis of FeCl3 and converted to a new one-dimensional KFeS2 cluster via a one-step hydrothermal route with the addition of K2S and KOH. The results showed that in the hydrothermal process, KFeS2 cluster grew radially from 2 μm to 10 μm with the increase in KOH concentration from 2 M to 5 M. The new cluster showed a high adsorption capacity of 2933.6 mg/L for doxycycline, which is 14 times that of sludge and higher than that of hematite nanoparticles, commercial polymeric ferric flocculant and pyrite. The adsorption isotherm complied with the Langmuir model, and the adsorption kinetics fitted well with the pseudo-second-order model. During adsorption, KFeS2 cluster was completely hydrolysed to release Fe/S-bearing colloids with a considerable number of Fe-SH/Fe-OH groups for the coordination of the NH2 group of tetracycline-type antibiotics, e.g. doxycycline. However, an inefficient removal of quinoline and p-nitrophenol was observed. With the proposed method, the used alkaline solution was completely recycled in the next round of KFeS2 synthesis without the generation of secondary waste. Such green method has potential applications in the resource utilisation of Fe-rich sludge.
Keywords	Fe-bearing precipitates ; Hydrothermal conversion ; KFeS2 ; Adsorption ; Doxycycline ; Chemistry ; QD1-999
Subject code	660
Language	English
Publishing date	2021-06-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Enrichment and recycling of Zn from electroplating wastewater as zinc phosphate via coupled coagulation and hydrothermal route

Rui Bian / Ting Su / Yidi Gao / Yu Chen / Suiyi Zhu / Chenggui Liu / Xianze Wang / Zhan Qu / Yuxin Zhang / Hong Zhang

Arabian Journal of Chemistry, Vol 15, Iss 3, Pp 103664- (2022)

2022

Abstract: Electroplating is a common process of converting zinc ion in electrolyte as a micro level zinc layer on electroplating pieces. After electroplating, the remaining electrolyte on the surface of the pieces is washed with water, and accordingly, Zn- ... ...

Abstract	Electroplating is a common process of converting zinc ion in electrolyte as a micro level zinc layer on electroplating pieces. After electroplating, the remaining electrolyte on the surface of the pieces is washed with water, and accordingly, Zn-containing electroplating wastewater is generated. Hazardous Zn-containing wastewater is generated during the washing of electroplating pieces and plating tank. Herein, Zn was enriched from wastewater by commercial flocculant and then recycled as highly purified zinc phosphate via coupled acid extraction and hydrothermal treatment. Firstly, 98.4% Zn was recovered as sludge from wastewater by adding 0.2 g/L of flocculant. Then, the sludge was dissolved into an acid solution to produce a leachate with 31.2/10.8/19.3 g/L of Fe/Al/Zn and then hydrothermally treated to remove Fe/Al. The Fe removal rate was only 54.2% without phosphate and glucose but was increased to 98.6% after the addition of 0.5 g of glucose with Al/Zn loss < 2%. However, when 0.5 g of glucose and 15 g/L of phosphate were used, 99.8% Fe and 96.6% Al were synchronously removed as giniite with Zn loss < 2%. After Fe/Al separation, the remaining Zn was finally recycled as Zn phosphate particles with 98.1 wt% Zn3(PO4)2·2H2O. The added phosphate predominated the synergy removal of Fe/Al and especially lowered the Gibbs value of Al hydrolysis from 39.7 kJ/mol of boehmite to −5.96 kJ/mol of giniite, thereby reducing start-up temperature and reaction time. The proposed method showed practical application in the enrichment and recycling of valuable metals from wastewater.
Keywords	Electroplating sludge ; Phosphate ; Hydrothermal ; Fe/Al separation ; Giniite ; Chemistry ; QD1-999
Subject code	660
Language	English
Publishing date	2022-03-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Review of resource utilization of Fe-rich sludges: purification, upcycling, and application in wastewater treatment

Yu, Chen / Dongxu, Liang / Hongyu, Chen / Suiyi, Zhu / Xianze, Wang / Jiakuan, Yang / Xinfeng, Xie / Eskola, Joseph / Dejun, Bian

Environmental reviews. 2022 July 19, v. 30, no. 3

2022

Abstract: This paper discusses the resource utilization of Fe-rich sludges generated as waste products from water treatment, hydrometallurgy, surface finishing, and dye chemical industries. Apart from the conventional landfill disposal of such sludges, the work ... ...

Abstract	This paper discusses the resource utilization of Fe-rich sludges generated as waste products from water treatment, hydrometallurgy, surface finishing, and dye chemical industries. Apart from the conventional landfill disposal of such sludges, the work focuses on sludge purification for new commercial products, including iron red/black dyes, an iron concentrate powder, a polyferric flocculant, a catalyst, and a magnetic adsorbent. Among such purifications, a new strategy was developed to recycle Fe-rich sludges for a new Fe/S-bearing flocculant. Given that Fe-rich sludges may contain rare and/or heavy metals, the purification of sludges as high-purity hematite nanoparticles and other valuable products is detailed as a new insight. Accordingly, the mechanisms for the phase transformation of Fe-bearing minerals and the purification of valuable Fe oxides are deeply considered. The work summarizes the pilot- and/or field-scale application for recycling of Fe-rich sludge and proposes the development of a new Fe/S flocculant and a high-purity hematite product.
Keywords	adsorbents ; catalysts ; flocculants ; hematite ; iron ; landfills ; magnetism ; nanoparticles ; phase transition ; sludge ; wastewater treatment
Language	English
Dates of publication	2022-0719
Size	p. 460-484.
Publishing place	Canadian Science Publishing
Document type	Article
ZDB-ID	2027518-3
ISSN	1208-6053 ; 1181-8700
ISSN (online)	1208-6053
ISSN	1181-8700
DOI	10.1139/er-2021-0038
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Upcycling of Fe-bearing sludge

Tongke Hu / Huaimin Wang / Ruyan Ning / Xueling Qiao / Yanwen Liu / Wenqing Dong / Suiyi Zhu

Scientific Reports, Vol 10, Iss 1, Pp 1-

preparation of erdite-bearing particles for treating pharmaceutical manufacture wastewater

2020 Volume 10

Abstract: Abstract Groundwater treatment sludge is a type of solid waste with 9.0–28.9% wt.% Fe content and is precipitated in large quantity from backwash wastewater in groundwater treatment. The sludge is mainly composed of fine particles containing Fe, Si and ... ...

Abstract	Abstract Groundwater treatment sludge is a type of solid waste with 9.0–28.9% wt.% Fe content and is precipitated in large quantity from backwash wastewater in groundwater treatment. The sludge is mainly composed of fine particles containing Fe, Si and Al oxides, such as ferrihydrite, quartz and boehmite. The Fe oxides mostly originate from the oxidation of ferrous Fe in groundwater, whilst the silicate/aluminium compounds mainly originate from the broken quartz sand filter in the backwash step. In general, the sludge is firstly coagulated, dewatered by filter pressing and finally undergoes harmless solidification before it is sent to landfills. However, this process is costly (approximately US$66.1/t) and complicated. In this study, groundwater treatment sludge was effectively recycled to prepare novel erdite-bearing particles via a one-step hydrothermal method by adding only Na2S·9H2O. After hydrothermal treatment, the quartz and boehmite of the sludge were dissolved and recrystallised to sodalite, whilst ferrihydrite was converted to an erdite nanorod at 160 °C and a hematite at 240 °C. SP160 was prepared as fine nanorod particles with 200 nm diameter and 2–5 μm length at a hydrothermal temperature of 160 °C. Nearly 100% OTC and its derivatives in pharmaceutical manufacture wastewater were removed by adding 0.1 g SP160. The major mechanism for the removal was the spontaneous hydrolysis of erdite in SP160 to generate Fe oxyhydroxide and use many hydroxyl groups for coordinating OTC and its derivatives. This study presents a novel method for the resource reutilisation of waste groundwater treatment sludge and reports efficient erdite-bearing particles for pharmaceutical manufacture wastewater treatment.
Keywords	Medicine ; R ; Science ; Q
Subject code	540
Language	English
Publishing date	2020-08-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Upcycling of groundwater treatment sludge to magnetic Fe/Mn-bearing nanorod for chromate adsorption from wastewater treatment.

Zhan Qu / Wenqing Dong / Yu Chen / Ge Dong / Suiyi Zhu / Yang Yu / Dejun Bian

PLoS ONE, Vol 15, Iss 6, p e

2020 Volume 0234136

Abstract: Groundwater treatment sludge is a Fe/Mn-bearing waste that is mass produced in groundwater treatment plant. In this study, sludge was converted to a magnetic adsorbent (MA) by adding ascorbate. The sludge was weakly magnetised in the amorphous form with ... ...

Abstract	Groundwater treatment sludge is a Fe/Mn-bearing waste that is mass produced in groundwater treatment plant. In this study, sludge was converted to a magnetic adsorbent (MA) by adding ascorbate. The sludge was weakly magnetised in the amorphous form with Fe and Mn contents of 28.8% and 8.1%, respectively. After hydrothermal treatment, Fe/Mn oxides in the sludge was recrystallised to siderite and rhodochrosite, with jacobsite as the intermediate in the presence of ascorbate. With an increment in ascorbate dosage, the obtained magnetic adsorbent had a significant increase in chromate adsorption but a decrease in magnetisation. When the Mascorbate/MFe molar ratio was 10, the produced MA-10 was a dumbbell-shaped nanorod with a length of 2-5 μm and a diameter of 0.5-1 μm. This MA-10 showed 183.2 mg/g of chromate adsorption capacity and 2.81 emu/g of magnetisation. The mechanism of chromate adsorption was surface coprecipitation of the generated Cr3+ and Fe3+/Mn4+ from redox reaction between chromate and siderite/rhodochrosite on MA-10, separately. This study demonstrated an efficient recycling route of waste sludge from groundwater treatment to produce MA for treating chromate-bearing wastewater.
Keywords	Medicine ; R ; Science ; Q
Subject code	660
Language	English
Publishing date	2020-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Resource Recovery of Waste Nd–Fe–B Scrap

Suiyi Zhu / Ting Su / Yu Chen / Zhan Qu / Xue Lin / Ying Lu / Mingxin Huo

Sustainability, Vol 12, Iss 7, p

Effective Separation of Fe as High-Purity Hematite Nanoparticles

2020 Volume 2624

Abstract: Recycling rare-earth elements from Nd magnet scrap (Nd−Fe−B scrap) is a highly economical process; however, its efficiency is low due to large portions of Fe impurity. In this study, the effective separation of Fe impurity from scrap was performed ... ...

Abstract	Recycling rare-earth elements from Nd magnet scrap (Nd−Fe−B scrap) is a highly economical process; however, its efficiency is low due to large portions of Fe impurity. In this study, the effective separation of Fe impurity from scrap was performed through an integrated nitric acid dissolution and hydrothermal route with the addition of fructose. Results showed that more than 99% of the scrap was dissolved in nitric acid, and after three dilutions that the Nd, Pr, Dy and Fe concentrations in the diluted acid were 9.01, 2.11, 0.37 and 10.53 g/L, respectively. After the acid was hydrothermally treated in the absence of fructose, only 81.8% Fe was removed as irregular hematite aggregates, whilst more than 98% rare-earth elements were retained. By adding fructose at an M fructose /M nitrate ratio of 0.2, 99.94% Fe was precipitated as hematite nanoparticles, and the loss of rare-earth elements was <2%. In the treated acid, the residual Fe was 6.3 mg/L, whilst Nd, Pr and Dy were 8.84, 2.07 and 0.36 g/L, respectively. Such composition was conducive for further recycling of high-purity rare-earth products with low Fe impurity. The generated hematite nanoparticles contained 67.92% Fe with a rare-earth element content of <1%. This value meets the general standard for commercial hematite active pharmaceutical ingredients. In this manner, a green process was developed for separating Fe from Nd−Fe−B scrap without producing secondary waste.
Keywords	nd-fe-b scrap ; hydrothermal treatment ; rare-earth elements ; recycling ; hematite ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
Language	English
Publishing date	2020-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Recycling of High-Purity Strontianite and Hematite from Strontium-Bearing Sludge

Rui Bian / Ting Su / Yu Chen / Zhan Qu / Suiyi Zhu / Xi Tian / Yang Huo

ACS Omega, Vol 5, Iss 23, Pp 14078-

2020 Volume 14085

Keywords	Chemistry ; QD1-999
Language	English
Publishing date	2020-06-01T00:00:00Z
Publisher	American Chemical Society
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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