Article
Engineering, Environmental
Zitong Xu, Siwei Gu, Dipak Rana, Takeshi Matsuura, Christopher Q. Lan
Summary: The study investigated the removal of Pb2+ ions by chemical precipitation enabled membrane filtration (CPEMF) using microfiltration (MF) and ultrafiltration (UF) membranes. Optimal conditions of 1 mM DIC and pH 8.5 were found to bring the permeate lead level below the drinking water standard, demonstrating the effectiveness of CPEMF in removing lead ions from water.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Public, Environmental & Occupational Health
Guihua Du, Fankun Zhou, Ouyang Lu, Kai Wang, Shaoqi Rao, Rui Su, Yanhui Zhu, Kechu Guo, Jinmei Xiao, Jie Xie, Qi Li, Chang Feng, Guangqin Fan
Summary: Environmental exposure to heavy metal mixture can cause harmful health effects. This study investigated how exposure to heavy metal mixture alters the metabolic dynamics of individual metals. The findings of this study are important for understanding the mechanism of the hazardous effects of heavy metal mixture exposure or revising guidelines for heavy metal exposure.
INTERNATIONAL JOURNAL OF HYGIENE AND ENVIRONMENTAL HEALTH
(2023)
Article
Engineering, Environmental
Arpassorn Threepanich, Pornsawai Praipipat
Summary: Lead removal is crucial due to its toxic effects on aquatic organisms and human health. Lemon peel-doped iron (III) oxide-hydroxide materials showed high lead removal efficiencies, with LPFB demonstrating the highest potential for lead adsorption at 100%. The adsorption kinetics of all materials followed a Pseudo-second order model, indicating the effectiveness of the doping metal oxide in improving material efficiencies.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Biotechnology & Applied Microbiology
Stuart Cairns, Sampriti Chaudhuri, Gabriel Sigmund, Iain Robertson, Natasha Hawkins, Tom Dunlop, Thilo Hofmann
Summary: This study shows that amending biochar with wood ash significantly enhances the immobilization of Pb, Cu, Zn, and Cd by an order of magnitude. The addition of wood ash increases pH and causes precipitation of minerals, leading to dominant mechanisms of metal immobilization through precipitation and ion exchange. Wood ash amended biochar proves to be a sustainable and cost-effective option for removing heavy metals from motorway runoff.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Engineering, Chemical
Shao-zhong Hu, Ting Huang, Nan Zhang, Yan-zhou Lei, Yong Wang
Summary: The discharge of wastewater rich in heavy metals and organic substances leads to ecosystem deterioration, environmental pollution, and food pollution. Metal organic frameworks (MOFs) are highly promising materials for wastewater treatment due to their large specific surface area and pore volume, as well as their structure designability. In this study, a novel adsorbent (PEI@UiO-66-NH2) was synthesized and it exhibited improved chemical stability and increased adsorption sites compared to common UiO-66-NH2. The adsorption behaviors of PEI@UiO-66-NH2 were systematically studied, and it was found that it can reach adsorption equilibrium within 5 minutes for Pb(II) and methyl orange (MO). The theoretical adsorption capacities for Pb(II) and MO were found to be 692.80 mg/g and 497.51 mg/g, respectively. The study also established dynamic theoretical adsorption models, providing guidance for scale-up experiments in wastewater treatment. PEI@UiO-66-NH2 showed excellent performance in recycling Pb(II) and MO, indicating its promising application in removing wastewater contaminants.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Agricultural Engineering
Dan Bahadur Pal, Roli Saini, Neha Srivastava, Irfan Ahmad, Mohammad Y. Alshahrani, Vijai Kumar Gupta
Summary: This study investigated the removal of lead from simulated wastewater using cost-effective bio-adsorbents made from mango seed shell with kernel (M) and jamun seed shell with kernel (JP). The optimal adsorption conditions were determined to be a speed of 500 rpm, a dosage of 60 mg, a pH of 6.5, and a contact time of 120 min. The bio-adsorbents exhibited adsorption capacities of around 39.15 mg/g for M and 20.28 mg/g for JP, with maximum lead removal efficiencies of 94.85% and 92.78%, respectively. The Freundlich model and pseudo-first order reaction kinetic model were found to best fit the regression coefficient for both bio-adsorbents.
BIORESOURCE TECHNOLOGY
(2022)
Article
Chemistry, Physical
Oana Stoian, Cristina Ileana Covaliu, Gigel Paraschiv, Gina-Alina Catrina (Traistaru), Mihai Nita-Lazar, Ecaterina Matei, Sorin Stefan Biris, Paula Tudor
Summary: This article presents a nonconventional method using magnetite nanomaterial for efficient removal of lead ions from industrial wastewater. The experimental results show that the efficiency is highest at pH 6, impacted by both lower and higher pH values. Langmuir and Freundlich models were used to describe the adsorption process.
Article
Agricultural Engineering
Xiaohong Hu, Linxin Dai, Qianli Ma, Jianying Xu, Jianfeng Ma, Xing'e Liu
Summary: A novel codeposition strategy was developed to synthesize magnetic porous char (MPC) using bamboo hydrochar as precursors. The synthesized MPC demonstrated excellent adsorption capacities and rapid adsorption rate for Cu(II) and Pb(II). The study proposed a synergistic mechanism of chemical complexation and physical adsorption for the higher adsorption capabilities of MPC. Furthermore, the regeneration investigation revealed that the sorption efficiencies of MPC remained high after multiple cycles.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Chemistry, Physical
Jun Wang, Jingjing Zhan, Hao Zhou, Xianliang Yi, Yang Liu
Summary: Tourmaline-LiCoO2 composites were synthesized and found to have high adsorption capacity for Pb2+. The optimal conditions for Pb2+ adsorption were determined to be 0.375 g tourmaline addition and sintering at 800 degrees C. The adsorption behavior of TM0.375LCO800 was influenced by solution pH and foreign cations, with Cu2+ and Zn2+ having the largest effect. XRD, ATR, SEM, TEM, UV-vis DRS, and XPS analysis revealed the physicochemical properties of the composites. The high-temperature transformation of tourmaline and LiCoO2 promoted Pb2+ removal. This study highlights the potential of tourmaline-LiCoO2 composites for heavy metal ion removal and provides scientific insights for future environmental applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Environmental Sciences
Yanping Bao, Jinhao Lai, Yishun Wang, Zheng Fang, Yongshi Su, Daniel S. Alessi, Nanthi S. Bolan, Xiaolian Wu, Yan Zhang, Xueding Jiang, Zhihong Tu, Hailong Wang
Summary: The co-precipitation of dissolved organic matter (DOM) with iron (III) is widespread in natural environments, but the effects of DOM on the formation of Fe(III) hydroxysulfate (FHS) and its environmental implications are not well understood. In this study, fulvic acid (FA) was used as a model DOM compound to investigate its effects on FHS formation, as well as the Pb(II) adsorption capabilities of FHSs biosynthesized under various FA dosages. The results showed that FA co-precipitation promoted the formation of Fe-FA composites, FA-doped schwertmannite, and small particles of jarosite. The adsorption kinetics, isotherms, and mechanisms of Pb onto the biosynthesized FHSs were comprehensively characterized and modeled.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Yong Zeng, Zezhi Chen, Yaling Du, Qingyang Lyu, Ziyi Yang, Yang Liu, Zhiying Yan
Summary: MICP technology was successfully applied to mineralize toxic metals (lead and cadmium) in landfill leachate for the first time. The analysis revealed that the precipitates consisted predominantly of calcite crystals, while lead was fixed as hydrocerussite.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Multidisciplinary Sciences
Zeinab Babazad, Fariborz Kaveh, Mehdi Ebadi, Ramin Zafar Mehrabian, Mohammad Habibi Juibari
Summary: The study utilized porous carbon material obtained from rice husk to adsorb and remove lead and arsenic from aqueous solutions, achieving high removal efficiency under optimum conditions optimized using Response Surface Method.
Article
Environmental Sciences
Jianlong Hu, Jixu Zhao, Xi Zheng, Simeng Li, Qi Lv, Cunzhen Liang
Summary: Heavy metals are a major obstacle to the use of sewage sludge in land applications. Traditional chelators have drawbacks of low biodegradability. This study found that MGDA, a biodegradable chelator, is a potential environmentally friendly alternative for removing heavy metals from sludge, reducing the risk of secondary pollution.
Article
Chemistry, Physical
Wen Song, Xue Zhang, Lu Zhang, Zihan Yu, Xuguang Li, Yanfei Li, Yu Cui, Yanxia Zhao, Liangguo Yan
Summary: In this study, the adsorption mechanisms of polyethylene glycol modified MgAl-LDH for Cu(II), Pb(II), and Cd(II) were qualitatively and quantitatively investigated. The results showed that the precipitation mechanism was the main contributor, accounting for 44.20%-72.12%. The contributions of complexation, isomorphous substitution, and electrostatic attraction to the total adsorption amounts were 12.43%-37.89%, 6.35%-18.81%, and <3.5%, respectively. After modification, the contribution of precipitation increased and complexation decreased.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Environmental Sciences
Telma Belen Musso, Luciano Carlos, Maria Eugenia Parolo, Franco Matias Francisca, Gisela Pettinari, Valeria Giuliano, Marianerla Ruffato
Summary: This study evaluated the Cu(II) removal capacity of a raw calcareous mudstone used as a liner material. Results showed that the calcareous mudstone exhibited higher removal capacity compared to commercial Na-bentonite, and the presence of calcite, a component of the mudstone, played a significant role in Cu(II) removal. Organic compounds had minimal effect on Cu(II) removal, while the presence of humic acids favored Cu(II) sorption in the clay fraction.
WATER AIR AND SOIL POLLUTION
(2022)
