Ultrasound-assisted sorption of Pb(ii) on multi-walled carbon nanotube in presence of natural organic matter: an insight into main and interaction effects using modelling approaches of RSM and BRT

Molecular dynamics modeling of systems containing a Na-exchanged hectorite and model natural organic matter molecules along with pure H2O, pure CO2, or a mixture of H2O and CO2 provides significant new insight into the molecular scale interactions among silicate surfaces, dissolved cations and organic molecules, H2O and CO2.

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Effective natural organic matter removal in pond water by carbon nanotube membrane with flocculation/adsorption

Water Science & Technology Water Supply ◽

10.2166/ws.2017.005 ◽

2017 ◽

Vol 17 (4) ◽

pp. 1080-1087

Author(s):

Jieun Lee ◽

Saravanamuth Vigneswaran ◽

Yongshun Zhang ◽

Ramireddy S. P. Raj Reddy ◽

Zongwen Liu

Keyword(s):

Organic Matter ◽

Carbon Nanotube ◽

Water Treatment ◽

Natural Organic Matter ◽

Removal Rate ◽

Pond Water ◽

Aluminium Chloride ◽

Superior Performance ◽

Permeate Flux ◽

Flux Decline

A carbon nanotube (CNT) ultrafiltration (UF) membrane was applied to natural organic matter (NOM) removal in pond water treatment. The source water was pretreated by flocculation and/or adsorption prior to the UF process to alleviate permeate flux decline and improve NOM removal efficiency. The performance of a commercial polyethersulfone (PES) UF membrane was compared to evaluate that of the CNT membrane. The CNT membrane outperformed the PES-UF membrane. The permeate flux, total organic carbon and humic acid (HA) removal rate of the CNT membrane was observed to be 230 LMH/bar, 60%, and 80% when 30 mg/L poly aluminium chloride (PACI) flocculation was applied. This highlights that the permeate flux was three times higher with slightly higher rejection efficiency than the PES-UF membrane. In particular, severe permeate flux decline was completely overcome by the CNT membrane with 30 mg/L PACI coagulation. For powder activated carbon (PAC) adsorption, even though there was a severe permeate flux decline in the CNT membrane, almost complete HA removal (98%) was achieved when 0.5 g/L PAC adsorption was coupled. Based on the superior performance of the CNT membrane with pretreatment, the CNT membrane is suggested to be a robust system for a high concentration of organic matter pond water treatment without membrane flux decline.

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The influence of natural organic matter on the adsorption of microcystin-LR by powdered activated carbon

Environmental Science Water Research & Technology ◽

10.1039/c8ew00582f ◽

2019 ◽

Vol 5 (2) ◽

pp. 256-267 ◽

Cited By ~ 2

Author(s):

Asnika Bajracharya ◽

Yen-Ling Liu ◽

John J. Lenhart

Keyword(s):

Organic Matter ◽

Activated Carbon ◽

Natural Organic Matter ◽

Powdered Activated Carbon ◽

Different Types ◽

Insight Into

In this study, microcystin-LR (MC-LR) adsorption to four different types of powdered activated carbon (PAC) was evaluated to provide insight into the use of PAC to treat water containing MC-LR.

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