Sadia Ilyas

Hanyang University

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Hyunjung Kim

Anyang University

Rajiv Ranjan Srivastava

Duy Tan University

Jae-chun Lee

Korea Institute of Geoscience and Mineral Resources

Haq Nawaz Bhatti

University of Faisalabad

Humma Akram Cheema

Hanyang University

Allan Gomez-Flores

Hanyang University

Sowon Choi

Jeonbuk National University

Nimra Ilyas

University of Agriculture Faisalabad

Hyunjung Kim

Anyang University

Vinay K. Singh

Punjab Engineering College

Cooperative Institutions

University of Agriculture Faisalabad

University of Faisalabad

Hanyang University

Jeonbuk National University

Anyang University

Korea Institute of Geoscience and Mineral Resources

Government College University, Faisalabad

University of Sri Jayewardenepura

Mineral Resources

Korea University of Science and Technology

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Impacts of Microplastics and Nanoplastics on Biota

CRC Press eBooks (2022)

Sadia Ilyas Hyunjung Kim Gukhwa Hwang

Microplastics and nanoplastics are found in almost all aquatic and terrestrial environments making their potentially pernicious effects a global problem. The difference in type, shape, and density cause these plastics to disperse in different compartments of the aquatic and terrestrial environment and influence their availability to organisms at different trophic levels and/or occupying different habitats. The current chapter describes the impact of microplastics and nanoplastics on soil and plant characteristics. Furthermore, the impact of microplastics and nanoplastics on invertebrates and vertebrates is also highlighted. Pelagic organisms such as phytoplankton and small crustaceans are more likely to encounter less dense, floating microplastics and nanoplastics while benthic organisms, including amphipods, polychaete worms, tubifex worms, mollusks, and echinoderms, are more likely to encounter microplastics (MPs) that are denser than water. Both benthic and pelagic fish may ingest MPs directly or indirectly. Birds and mammals feeding on aquatic organisms or living in aquatic environments are also known to ingest MPs. Additionally, the impact of various plastics on human health, including various sources, exposure pathways, and toxicity levels of various plastics, is also discussed in detail.

Oligochaeta (plant)

10.1201/9781003200628-5

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Citations (1)

Role of Green and Integrated Chemistry in Sustainable Metallurgy

Sadia Ilyas Muhammad Farhan Haq Nawaz Bhatti

This chapter contains sections titled: Introduction Role of Green and Integrated Chemistry in Sustainbale Metallurgy of Primary Resources Role of Green and Integrated Chemistry in Sustainable Metallurgy of Secondrey Resources Perspectives on Integrated Chemical and Biological Routes for Mineral/Material Processing

10.1002/9781119509868.ch11

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Citations (1)

O2-enriched microbial activity with pH-sensitive solvo-chemical and electro-chlorination strategy to reclaim critical metals from the hazardous waste printed circuit boards

Journal of Hazardous Materials (2021)

Sadia Ilyas Rajiv Ranjan Srivastava Hyunjung Kim

Brine

Base metal

Gold cyanidation

10.1016/j.jhazmat.2021.125769

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Citations (35)

Cationic collector conformations on an oxide mineral interface: Roles of pH, ionic strength, and ion valence

Minerals Engineering (2020)

Stephen Kayombo Solongo Allan Gomez-Flores Junhyuk You Sowon Choi Graeme W. Heyes

Quartz Crystal Microbalance

Cationic polymerization

10.1016/j.mineng.2020.106277

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Citations (16)

Challenges and Future in Ni Laterite Ore Enrichment: A Critical Review

Mineral Processing and Extractive Metallurgy Review (2023)

Levie Mweene Allan Gomez-Flores Hee-Eun Jeong Sadia Ilyas Hyunjung Kim

Nickel is a strategic element whose production and consumption in over a decade has increased to over 39% and 71%, respectively. Generally, due to their complex mineralogy, laterites, the current attractive source of Ni, are subjected to hydrometallurgy and pyrometallurgy techniques without enrichment in order to extract Ni. Therefore, numerous investigations in vogue on laterite enrichment performed spanning from 1964 to date were reviewed in this article, and the future directions were proposed through critical synthesis. The possibilities of obtaining both higher recoveries and increase in grade for Ni were noticed using selective comminution-classification method followed by flocculation-flotation strategy. Hence, in order to improve on the reported Ni yields from selective comminution-classification process, one of the ways could be to subject the ore to a multi-stage selective comminution-classification method followed by subjecting the obtained concentrate to flocculation-flotation technique. Therefore, the findings of this investigation would aid in upscaling the production to meet the demand.

Laterite

10.1080/08827508.2023.2214668

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Citations (15)

Eco-threat Minimization in HCl Leaching of PGMs from Spent Automobile Catalysts by Formic Acid Prereduction

ACS Sustainable Chemistry & Engineering (2017)

Ha Bich Trinh Jae-chun Lee Rajiv Ranjan Srivastava Sookyung Kim Sadia Ilyas

Reclamation of spent automobile catalysts via aqueous processing for the efficient recovery of Pt, Pd, and Rh (PGMs) has remained a challenge. In this research, the effect of prereduction by HCOOH on PGMs leaching using mild acid was investigated and compared to the typical leaching procedure that uses concentrated HCl. Prereduced samples with particle sizes of <0.59 mm demonstrated a remarkable enhancement in the leaching efficiency of PGMs at a lower lixiviant concentration. Using higher acid concentration (>4.0 M HCl), the prereduction effect on PGMs extraction was negligible compared to leaching without HCOOH prereduction. A detailed study of the influential parameters revealed the optimal prereduction conditions to be HCOOH concentration, 15 vol %; pulp density, 10%; temperature, 60 °C; and time, 1 h. Postreduction leaching in 2.0 M HCl at 90 °C for 2 h yielded > 80% Pt, > 85% Pd, and >62% Rh in leach liquor. A subsequent study on the addition of oxidant during the leaching step further enhanced the extraction efficacy up to ∼95% PGMs by introducing ≥1.5 M NaClO3. The results revealed that a HCOOH prereduction step can significantly minimize the environmental impact and cost of reagents with the maximum yield of PGMs in a less acidic solution.

Lixiviant

10.1021/acssuschemeng.7b01538

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Citations (60)

A Deep Learning based Approach for Precise Video Tagging

Sadia Ilyas Hafeez Ur Rehman

With the increase in smart devices and abundance of video contents, efficient techniques for the indexing, analysis and retrieval of videos are becoming more and more desirable. Improved indexing and automated analysis of millions of videos could be accomplished by getting videos tagged automatically. A lot of existing methods fail to precisely tag videos because of their lack of ability to capture the video context. The context in a video represents the interactions of objects in a scene and their overall meaning. In this work, we propose a novel approach that integrates the video scene ontology with CNN (Convolutional Neural Network) for improved video tagging. Our method captures the content of a video by extracting the information from individual key frames. The key frames are then fed to a CNN based deep learning model to train its parameters. The trained parameters are used to generate the most frequent tags. Highly frequent tags are used to summarize the input video. The proposed technique is benchmarked on the most widely used dataset of video activities, namely, UCF-101. Our method managed to achieve an overall accuracy of 99.8% with an F1- score of 96.2%.

Video content analysis

10.1109/icet48972.2019.8994567

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Citations (14)

Biotechnological recycling of hazardous waste PCBs using Sulfobacillus thermosulfidooxidans through pretreatment of toxicant metals: Process optimization and kinetic studies

Chemosphere (2021)

Sadia Ilyas Rajiv Ranjan Srivastava Hyunjung Kim Nimra Ilyas

10.1016/j.chemosphere.2021.131978

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Citations (46)

Biotechnological recycling of critical metals from waste printed circuit boards

Journal of Chemical Technology & Biotechnology (2020)

Rajiv Ranjan Srivastava Sadia Ilyas Hyunjung Kim Sowon Choi Ha Bich Trinh

Abstract Critical metals are key raw materials for new generation clean energy production. The extraction of critical metals often follows the difficult processing of primary ores and they are many times recovered as the companion metals. With the depletion of primary reserves, the focus has now shifted to processing the urban mines, like electronic (e‐)waste. Among the different types of e‐waste, the waste printed circuit boards (WPCBs) are the major reservoir of high‐value critical metals and are usually treated by the traditional pyro‐ and/or hydro‐metallurgical techniques. However, the application of microbial activities in metals recycling is rapidly emerging as a green technology in comparison to smelter or chemical processing. The application of microorganisms (bacteria/fungi) in WPCBs’ recycling is being increasingly explored in order to meet the parallel objectives of resource recovery and pollution mitigation. Therefore, the present article assesses the current frontiers in bioleaching of critical metals from WPCBs and contains discussions on process fundamentals, challenges, and perspectives. The applicability of microbial recycling of WPCBs at a higher scale in terms of a circular economy and urban mining notion, the techno‐economic analysis, and environmental sustainability in comparison to the chemical processing route are also discussed. © 2020 Society of Chemical Industry

10.1002/jctb.6469

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Citations (54)

Bioleaching of metals from electronic scrap in a stirred tank reactor

Hydrometallurgy (2014)

Sadia Ilyas Jae-chun Lee

Scrap

10.1016/j.hydromet.2014.07.004

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Citations (76)