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Nanostructured Carbon Florets as Scavenger of As3+, Cr6+, Cd2+, and Hg2+ for Water Remediation
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-01-14 , DOI: 10.1021/acsanm.9b02052 Maku Moronshing 1 , Ananya Sah 1 , Vishwanath Kalyani 1 , Chandramouli Subramaniam 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-01-14 , DOI: 10.1021/acsanm.9b02052 Maku Moronshing 1 , Ananya Sah 1 , Vishwanath Kalyani 1 , Chandramouli Subramaniam 1
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Anthropogenically triggered escalating contamination of water by heavy-metal ions (As3+, Cr6+, Cd2+, and Hg2+) demands newer and efficient types of adsorbents for their comprehensive scavenging. The wide pH range (pH 2–13) at which such contamination persists makes it challenging to realize a single-step remediation approach. Addressing these escalating demands, a singular adsorbent capable of capturing multiple heavy metal ions with high adsorption capacity across a wide range of pH is herewith reported for sustainable water remediation. Three-dimensional dendritic mesoporous nanostructured carbon florets (NCFs) with high specific surface area (936 m2/g) and easily accessible open-ended pore structure (1.23 cm3/g) achieve highly efficient removal of multiple heavy metal ions (As3+, Cr6+, Cd2+, and Hg2+). The hydrophilic surface of NCF ensures extensive and efficient interfacing with the water feedstock, while its chemical stability ensures its effectiveness as an adsorbent over a wide pH range (pH 2 to pH 13). The synergistic combination of these factors enables excellent adsorption efficiency (AE; ranging from 80% to 90%) and uniformly high adsorption capacity (qe) toward a variety of heavy-metal ions such as Hg2+ (395 ± 4 mg/g), Cd2+ (402 ± 5 mg/g), Cr6+ (436 ± 3 mg/g), and As3+ (412 ± 4 mg/g). Moreover, the gravity-driven purification of water does not demand any external source of electrical power and is scalable for on-site implementation. Facile regeneration of the NCF and its reusability over multiple cycles is also demonstrated for practical and sustainable application in water remediation.
中文翻译：
纳米结构碳小花作为As 3+，Cr 6+，Cd 2+和Hg 2+的清除剂用于水修复
人为触发的重金属离子（As 3+，Cr 6+，Cd 2+和Hg 2+）对水的污染逐步升级，因此需要更新有效的吸附剂类型来进行全面清除。这种污染持续存在的宽pH范围（pH 2-13）使得实现单步修复方法具有挑战性。为了满足这些不断增长的需求，据报道，一种能够在多种pH范围内以高吸附能力捕获多种重金属离子的单一吸附剂可实现可持续的水修复。具有高比表面积（936 m 2）的三维树枝状介孔纳米结构碳小花（NCF）/ g）和易于接近的开放式孔结构（1.23 cm 3 / g）实现了多种重金属离子（As 3+，Cr 6+，Cd 2+和Hg 2+）的高效去除。NCF的亲水性表面确保了与水原料的广泛有效连接，而其化学稳定性确保了其在宽pH范围（pH 2至pH 13）中作为吸附剂的有效性。这些因素的协同组合可实现出色的吸附效率（AE；从80％到90％不等）和对各种重金属离子（例如Hg 2+（395±4 mg / g ）的均匀高吸附容量（q e）），Cd 2+（402±5 mg / g），铬6+（436±3 mg / g）和As 3+（412±4 mg / g）。此外，重力驱动的水净化不需要任何外部电源，并且可以现场实施扩展。还证明了NCF的简便再生及其在多个循环中的可重复使用性，可用于水修复中的实用且可持续的应用。
更新日期：2020-01-14
中文翻译：
纳米结构碳小花作为As 3+，Cr 6+，Cd 2+和Hg 2+的清除剂用于水修复
人为触发的重金属离子（As 3+，Cr 6+，Cd 2+和Hg 2+）对水的污染逐步升级，因此需要更新有效的吸附剂类型来进行全面清除。这种污染持续存在的宽pH范围（pH 2-13）使得实现单步修复方法具有挑战性。为了满足这些不断增长的需求，据报道，一种能够在多种pH范围内以高吸附能力捕获多种重金属离子的单一吸附剂可实现可持续的水修复。具有高比表面积（936 m 2）的三维树枝状介孔纳米结构碳小花（NCF）/ g）和易于接近的开放式孔结构（1.23 cm 3 / g）实现了多种重金属离子（As 3+，Cr 6+，Cd 2+和Hg 2+）的高效去除。NCF的亲水性表面确保了与水原料的广泛有效连接，而其化学稳定性确保了其在宽pH范围（pH 2至pH 13）中作为吸附剂的有效性。这些因素的协同组合可实现出色的吸附效率（AE；从80％到90％不等）和对各种重金属离子（例如Hg 2+（395±4 mg / g ）的均匀高吸附容量（q e）），Cd 2+（402±5 mg / g），铬6+（436±3 mg / g）和As 3+（412±4 mg / g）。此外，重力驱动的水净化不需要任何外部电源，并且可以现场实施扩展。还证明了NCF的简便再生及其在多个循环中的可重复使用性，可用于水修复中的实用且可持续的应用。
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