This page has only limited features, please log in for full access.
Arsenic contamination in drinking water has become an increasingly important issue due to its high toxicity to humans. The present study focuses on the development of the yttrium-based adsorbents, with basic yttrium carbonate (BYC), Ti-loaded basic yttrium carbonate (Ti-loaded BYC) and yttrium hydroxide prepared using a co-precipitation method. The Langmuir isotherm results confirmed the maximum adsorption capacity of Ti-loaded BYC (348.5 mg/g) was 25% higher than either BYC (289.6 mg/g) or yttrium hydroxide (206.5 mg/g) due to its increased specific surface area (82 m2/g) and surface charge (PZC: 8.4). Pseudo first- and second-order kinetic models further confirmed that the arsenate removal rate of Ti-loaded BYC was faster than for BYC and yttrium hydroxide. It was subsequently posited that the dominant removal mechanism of BYC and Ti-loaded BYC was the carbonate-arsenate ion exchange process, whereas yttrium hydroxide was regarded to be a co-precipitation process. The Ti-loaded BYC also displayed the highest adsorption affinity for a wide pH range (3–11) and in the presence of coexisting anionic species such as phosphate, silicate, and bicarbonate. Therefore, it is expected that Ti-loaded BYC can be used as an effective and practical adsorbent for arsenate remediation in drinking water.
Sang-Ho Lee; Kyoung-Woong Kim; Byung-Tae Lee; Sunbaek Bang; Hyunseok Kim; HyoRang Kang; Am Jang. Enhanced Arsenate Removal Performance in Aqueous Solution by Yttrium-Based Adsorbents. International Journal of Environmental Research and Public Health 2015, 12, 13523 -13541.
AMA StyleSang-Ho Lee, Kyoung-Woong Kim, Byung-Tae Lee, Sunbaek Bang, Hyunseok Kim, HyoRang Kang, Am Jang. Enhanced Arsenate Removal Performance in Aqueous Solution by Yttrium-Based Adsorbents. International Journal of Environmental Research and Public Health. 2015; 12 (10):13523-13541.
Chicago/Turabian StyleSang-Ho Lee; Kyoung-Woong Kim; Byung-Tae Lee; Sunbaek Bang; Hyunseok Kim; HyoRang Kang; Am Jang. 2015. "Enhanced Arsenate Removal Performance in Aqueous Solution by Yttrium-Based Adsorbents." International Journal of Environmental Research and Public Health 12, no. 10: 13523-13541.
In order to assess the ecological effect of acid mine drainage, metal mine (Dalsung) and coal mine (Samtan) drainage in South Korea were collected. The each mine drainage then investigated by whole effluent toxicity test (WET) and toxicity identification evaluation (TIE). WET results demonstrated that DS leachate and ST mine water is more toxic than other mine drainage due to the presence of cationic metals and acidic pH. TIE results revealed that the acidic pH and copper (Cu) could be the main toxicants in both mine drainage. The strong acidic pH (pH < 3.5) enhanced the metal toxicity by increase of metal activity and bioavailability. The toxicity of most mine drainage revealed that the positive correlation between metal concentration and toxicity unit (TU). The regression data between TU and sum of cumulative criterion unit (CCU) demonstrated the reasonable statistical significance (R = 0.89; p < 0.01), however the excessive iron concentration in mine drainage could be an inhibition factor to estimate the toxicity by the effect of amorphous iron precipitate.
Sang-Ho Lee; Injeong Kim; Kyoung-Woong Kim; Byung-Tae Lee. Ecological assessment of coal mine and metal mine drainage in South Korea using Daphnia magna bioassay. SpringerPlus 2015, 4, 518 .
AMA StyleSang-Ho Lee, Injeong Kim, Kyoung-Woong Kim, Byung-Tae Lee. Ecological assessment of coal mine and metal mine drainage in South Korea using Daphnia magna bioassay. SpringerPlus. 2015; 4 (1):518.
Chicago/Turabian StyleSang-Ho Lee; Injeong Kim; Kyoung-Woong Kim; Byung-Tae Lee. 2015. "Ecological assessment of coal mine and metal mine drainage in South Korea using Daphnia magna bioassay." SpringerPlus 4, no. 1: 518.