PMID- 30248866 OWN - NLM STAT- MEDLINE DCOM- 20181221 LR - 20181221 IS - 1879-1026 (Electronic) IS - 0048-9697 (Linking) VI - 645 DP - 2018 Dec 15 TI - Arsenic removal by natural and chemically modified water melon rind in aqueous solutions and groundwater. PG - 1444-1455 LID - S0048-9697(18)32710-4 [pii] LID - 10.1016/j.scitotenv.2018.07.218 [doi] AB - Contamination of groundwater with toxic arsenic (As) has become an emerging health and environmental problem around the world, which has seen significant attention amongst the scientists for development of new sorbents to remediate As-contaminated water. Here, we explored the arsenate (As(V)) and arsenite (As(III)) sorption to natural water melon rind (WMR), xanthated WMR and citric acid-modified WMR in aqueous solutions, and determined potential of the most potent sorbent for As removal in groundwater. Xanthated WMR (X-WMR) showed relatively higher As(V) and As(III) removal than the citric acid modified WMR (CA-WMR) and natural WMR. The maximum As(III) (99%) and As(V) (98%) removal was obtained at pH 8.2 and 4.6, respectively, by X-WMR at 4 mg L(-1) initial As(V) and As(III) concentrations and sorbent dose of 1 g L(-1). Langmuir isotherm model best fitted (R(2) of up to 0.96) the data both for As(III) and As(V) sorption to X-WMR. Sorption kinetics of As(V) and As(III) was well described (R(2) of up to 0.99) by the pseudo second-order model on surface of the X-WMR. Thermodynamic investigations revealed that As(V) and As(III) sorption was endothermic and spontaneous. The FTIR spectroscopy depicted the presence of different surface function groups (OH, COOH, S-bearing (C=S, S=O and S-S)) which were involved in As(V) and As(III) sequestration on the sorbents examined here. Significantly, X-WMR showed (up to 49%) greater As(III) and As(V) sorption than that of natural WMR. Our results demonstrated that X-WMR efficiently removed 94%-100% (n = 16) of As from As-contaminated drinking well water which possessed detectable concentrations of some anions (e.g., SO(4), CO(3), HCO(3)). This study highlights that the X-WMR has potential to remove As, notably As(III), from solutions and drinking water, and might be utilized as a reactive medium for the treatment of As-contaminated water. CI - Copyright (c) 2018 Elsevier B.V. All rights reserved. FAU - Shakoor, Muhammad Bilal AU - Shakoor MB AD - Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan; Department of Environmental Sciences and Engineering, Government College University Faisalabad, Faisalabad 38000, Pakistan. FAU - Niazi, Nabeel Khan AU - Niazi NK AD - Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan; MARUM and Department of Geosciences, University of Bremen, Bremen D-28359, Germany. Electronic address: nabeel.niazi@uaf.edu.pk. FAU - Bibi, Irshad AU - Bibi I AD - Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan; MARUM and Department of Geosciences, University of Bremen, Bremen D-28359, Germany. Electronic address: irshad.niazi@uaf.edu.pk. FAU - Shahid, Muhammad AU - Shahid M AD - Department of Environmental Sciences, COMSATS University Islamabad, Vehari Campus, Vehari, Pakistan. FAU - Sharif, Fakhra AU - Sharif F AD - Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan. FAU - Bashir, Safdar AU - Bashir S AD - Sub-campus Depalpur, Okara, University of Agriculture Faisalabad, Okara, Pakistan. FAU - Shaheen, Sabry M AU - Shaheen SM AD - University of Kafrelsheikh, Faculty of Agriculture, Department of Soil and Water Sciences, 33 516 Kafr El-Sheikh, Egypt; University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstrasse 7, 42285 Wuppertal, Germany. FAU - Wang, Hailong AU - Wang H AD - Biochar Engineering Technology Research Center of Guangdong Province, School of Environment and Chemical Engineering, Foshan University, Foshan 528000, China; Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A & F University, Lin'an, Hangzhou 311300, China. FAU - Tsang, Daniel C W AU - Tsang DCW AD - Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. FAU - Ok, Yong Sik AU - Ok YS AD - Korea Biochar Research Center & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea. FAU - Rinklebe, Jorg AU - Rinklebe J AD - University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstrasse 7, 42285 Wuppertal, Germany; Department of Environment, Energy and Geoinformatics, Sejong University, 98 Gunja-Dong, Guangjin-Gu, Seoul, South Korea. LA - eng PT - Journal Article DEP - 20180724 PL - Netherlands TA - Sci Total Environ JT - The Science of the total environment JID - 0330500 RN - 0 (Water Pollutants, Chemical) RN - 059QF0KO0R (Water) RN - N712M78A8G (Arsenic) SB - IM MH - Adsorption MH - Arsenic/*chemistry MH - Cucurbitaceae MH - Groundwater/*chemistry MH - Hydrogen-Ion Concentration MH - Kinetics MH - Water MH - Water Pollutants, Chemical/*chemistry MH - Water Purification/*methods OTO - NOTNLM OT - Biowaste OT - Citric acid OT - Contamination OT - Groundwater OT - Human health OT - Sorption-desorption EDAT- 2018/09/27 06:00 MHDA- 2018/12/24 06:00 CRDT- 2018/09/26 06:00 PHST- 2018/04/29 00:00 [received] PHST- 2018/07/16 00:00 [revised] PHST- 2018/07/16 00:00 [accepted] PHST- 2018/09/26 06:00 [entrez] PHST- 2018/09/27 06:00 [pubmed] PHST- 2018/12/24 06:00 [medline] AID - S0048-9697(18)32710-4 [pii] AID - 10.1016/j.scitotenv.2018.07.218 [doi] PST - ppublish SO - Sci Total Environ. 2018 Dec 15;645:1444-1455. doi: 10.1016/j.scitotenv.2018.07.218. Epub 2018 Jul 24.